| #include "../cache.h" |
| #include "../config.h" |
| #include "../refs.h" |
| #include "refs-internal.h" |
| #include "ref-cache.h" |
| #include "packed-backend.h" |
| #include "../iterator.h" |
| #include "../dir-iterator.h" |
| #include "../lockfile.h" |
| #include "../object.h" |
| #include "../dir.h" |
| #include "../chdir-notify.h" |
| #include "worktree.h" |
| |
| /* |
| * This backend uses the following flags in `ref_update::flags` for |
| * internal bookkeeping purposes. Their numerical values must not |
| * conflict with REF_NO_DEREF, REF_FORCE_CREATE_REFLOG, REF_HAVE_NEW, |
| * REF_HAVE_OLD, or REF_IS_PRUNING, which are also stored in |
| * `ref_update::flags`. |
| */ |
| |
| /* |
| * Used as a flag in ref_update::flags when a loose ref is being |
| * pruned. This flag must only be used when REF_NO_DEREF is set. |
| */ |
| #define REF_IS_PRUNING (1 << 4) |
| |
| /* |
| * Flag passed to lock_ref_sha1_basic() telling it to tolerate broken |
| * refs (i.e., because the reference is about to be deleted anyway). |
| */ |
| #define REF_DELETING (1 << 5) |
| |
| /* |
| * Used as a flag in ref_update::flags when the lockfile needs to be |
| * committed. |
| */ |
| #define REF_NEEDS_COMMIT (1 << 6) |
| |
| /* |
| * Used as a flag in ref_update::flags when we want to log a ref |
| * update but not actually perform it. This is used when a symbolic |
| * ref update is split up. |
| */ |
| #define REF_LOG_ONLY (1 << 7) |
| |
| /* |
| * Used as a flag in ref_update::flags when the ref_update was via an |
| * update to HEAD. |
| */ |
| #define REF_UPDATE_VIA_HEAD (1 << 8) |
| |
| /* |
| * Used as a flag in ref_update::flags when the loose reference has |
| * been deleted. |
| */ |
| #define REF_DELETED_LOOSE (1 << 9) |
| |
| struct ref_lock { |
| char *ref_name; |
| struct lock_file lk; |
| struct object_id old_oid; |
| }; |
| |
| struct files_ref_store { |
| struct ref_store base; |
| unsigned int store_flags; |
| |
| char *gitdir; |
| char *gitcommondir; |
| |
| struct ref_cache *loose; |
| |
| struct ref_store *packed_ref_store; |
| }; |
| |
| static void clear_loose_ref_cache(struct files_ref_store *refs) |
| { |
| if (refs->loose) { |
| free_ref_cache(refs->loose); |
| refs->loose = NULL; |
| } |
| } |
| |
| /* |
| * Create a new submodule ref cache and add it to the internal |
| * set of caches. |
| */ |
| static struct ref_store *files_ref_store_create(const char *gitdir, |
| unsigned int flags) |
| { |
| struct files_ref_store *refs = xcalloc(1, sizeof(*refs)); |
| struct ref_store *ref_store = (struct ref_store *)refs; |
| struct strbuf sb = STRBUF_INIT; |
| |
| base_ref_store_init(ref_store, &refs_be_files); |
| refs->store_flags = flags; |
| |
| refs->gitdir = xstrdup(gitdir); |
| get_common_dir_noenv(&sb, gitdir); |
| refs->gitcommondir = strbuf_detach(&sb, NULL); |
| strbuf_addf(&sb, "%s/packed-refs", refs->gitcommondir); |
| refs->packed_ref_store = packed_ref_store_create(sb.buf, flags); |
| strbuf_release(&sb); |
| |
| chdir_notify_reparent("files-backend $GIT_DIR", |
| &refs->gitdir); |
| chdir_notify_reparent("files-backend $GIT_COMMONDIR", |
| &refs->gitcommondir); |
| |
| return ref_store; |
| } |
| |
| /* |
| * Die if refs is not the main ref store. caller is used in any |
| * necessary error messages. |
| */ |
| static void files_assert_main_repository(struct files_ref_store *refs, |
| const char *caller) |
| { |
| if (refs->store_flags & REF_STORE_MAIN) |
| return; |
| |
| BUG("operation %s only allowed for main ref store", caller); |
| } |
| |
| /* |
| * Downcast ref_store to files_ref_store. Die if ref_store is not a |
| * files_ref_store. required_flags is compared with ref_store's |
| * store_flags to ensure the ref_store has all required capabilities. |
| * "caller" is used in any necessary error messages. |
| */ |
| static struct files_ref_store *files_downcast(struct ref_store *ref_store, |
| unsigned int required_flags, |
| const char *caller) |
| { |
| struct files_ref_store *refs; |
| |
| if (ref_store->be != &refs_be_files) |
| BUG("ref_store is type \"%s\" not \"files\" in %s", |
| ref_store->be->name, caller); |
| |
| refs = (struct files_ref_store *)ref_store; |
| |
| if ((refs->store_flags & required_flags) != required_flags) |
| BUG("operation %s requires abilities 0x%x, but only have 0x%x", |
| caller, required_flags, refs->store_flags); |
| |
| return refs; |
| } |
| |
| static void files_reflog_path_other_worktrees(struct files_ref_store *refs, |
| struct strbuf *sb, |
| const char *refname) |
| { |
| const char *real_ref; |
| const char *worktree_name; |
| int length; |
| |
| if (parse_worktree_ref(refname, &worktree_name, &length, &real_ref)) |
| BUG("refname %s is not a other-worktree ref", refname); |
| |
| if (worktree_name) |
| strbuf_addf(sb, "%s/worktrees/%.*s/logs/%s", refs->gitcommondir, |
| length, worktree_name, real_ref); |
| else |
| strbuf_addf(sb, "%s/logs/%s", refs->gitcommondir, |
| real_ref); |
| } |
| |
| static void files_reflog_path(struct files_ref_store *refs, |
| struct strbuf *sb, |
| const char *refname) |
| { |
| switch (ref_type(refname)) { |
| case REF_TYPE_PER_WORKTREE: |
| case REF_TYPE_PSEUDOREF: |
| strbuf_addf(sb, "%s/logs/%s", refs->gitdir, refname); |
| break; |
| case REF_TYPE_OTHER_PSEUDOREF: |
| case REF_TYPE_MAIN_PSEUDOREF: |
| files_reflog_path_other_worktrees(refs, sb, refname); |
| break; |
| case REF_TYPE_NORMAL: |
| strbuf_addf(sb, "%s/logs/%s", refs->gitcommondir, refname); |
| break; |
| default: |
| BUG("unknown ref type %d of ref %s", |
| ref_type(refname), refname); |
| } |
| } |
| |
| static void files_ref_path(struct files_ref_store *refs, |
| struct strbuf *sb, |
| const char *refname) |
| { |
| switch (ref_type(refname)) { |
| case REF_TYPE_PER_WORKTREE: |
| case REF_TYPE_PSEUDOREF: |
| strbuf_addf(sb, "%s/%s", refs->gitdir, refname); |
| break; |
| case REF_TYPE_MAIN_PSEUDOREF: |
| if (!skip_prefix(refname, "main-worktree/", &refname)) |
| BUG("ref %s is not a main pseudoref", refname); |
| /* fallthrough */ |
| case REF_TYPE_OTHER_PSEUDOREF: |
| case REF_TYPE_NORMAL: |
| strbuf_addf(sb, "%s/%s", refs->gitcommondir, refname); |
| break; |
| default: |
| BUG("unknown ref type %d of ref %s", |
| ref_type(refname), refname); |
| } |
| } |
| |
| /* |
| * Read the loose references from the namespace dirname into dir |
| * (without recursing). dirname must end with '/'. dir must be the |
| * directory entry corresponding to dirname. |
| */ |
| static void loose_fill_ref_dir(struct ref_store *ref_store, |
| struct ref_dir *dir, const char *dirname) |
| { |
| struct files_ref_store *refs = |
| files_downcast(ref_store, REF_STORE_READ, "fill_ref_dir"); |
| DIR *d; |
| struct dirent *de; |
| int dirnamelen = strlen(dirname); |
| struct strbuf refname; |
| struct strbuf path = STRBUF_INIT; |
| size_t path_baselen; |
| |
| files_ref_path(refs, &path, dirname); |
| path_baselen = path.len; |
| |
| d = opendir(path.buf); |
| if (!d) { |
| strbuf_release(&path); |
| return; |
| } |
| |
| strbuf_init(&refname, dirnamelen + 257); |
| strbuf_add(&refname, dirname, dirnamelen); |
| |
| while ((de = readdir(d)) != NULL) { |
| struct object_id oid; |
| struct stat st; |
| int flag; |
| |
| if (de->d_name[0] == '.') |
| continue; |
| if (ends_with(de->d_name, ".lock")) |
| continue; |
| strbuf_addstr(&refname, de->d_name); |
| strbuf_addstr(&path, de->d_name); |
| if (stat(path.buf, &st) < 0) { |
| ; /* silently ignore */ |
| } else if (S_ISDIR(st.st_mode)) { |
| strbuf_addch(&refname, '/'); |
| add_entry_to_dir(dir, |
| create_dir_entry(dir->cache, refname.buf, |
| refname.len, 1)); |
| } else { |
| if (!refs_resolve_ref_unsafe(&refs->base, |
| refname.buf, |
| RESOLVE_REF_READING, |
| &oid, &flag)) { |
| oidclr(&oid); |
| flag |= REF_ISBROKEN; |
| } else if (is_null_oid(&oid)) { |
| /* |
| * It is so astronomically unlikely |
| * that null_oid is the OID of an |
| * actual object that we consider its |
| * appearance in a loose reference |
| * file to be repo corruption |
| * (probably due to a software bug). |
| */ |
| flag |= REF_ISBROKEN; |
| } |
| |
| if (check_refname_format(refname.buf, |
| REFNAME_ALLOW_ONELEVEL)) { |
| if (!refname_is_safe(refname.buf)) |
| die("loose refname is dangerous: %s", refname.buf); |
| oidclr(&oid); |
| flag |= REF_BAD_NAME | REF_ISBROKEN; |
| } |
| add_entry_to_dir(dir, |
| create_ref_entry(refname.buf, &oid, flag)); |
| } |
| strbuf_setlen(&refname, dirnamelen); |
| strbuf_setlen(&path, path_baselen); |
| } |
| strbuf_release(&refname); |
| strbuf_release(&path); |
| closedir(d); |
| |
| /* |
| * Manually add refs/bisect and refs/worktree, which, being |
| * per-worktree, might not appear in the directory listing for |
| * refs/ in the main repo. |
| */ |
| if (!strcmp(dirname, "refs/")) { |
| int pos = search_ref_dir(dir, "refs/bisect/", 12); |
| |
| if (pos < 0) { |
| struct ref_entry *child_entry = create_dir_entry( |
| dir->cache, "refs/bisect/", 12, 1); |
| add_entry_to_dir(dir, child_entry); |
| } |
| |
| pos = search_ref_dir(dir, "refs/worktree/", 11); |
| |
| if (pos < 0) { |
| struct ref_entry *child_entry = create_dir_entry( |
| dir->cache, "refs/worktree/", 11, 1); |
| add_entry_to_dir(dir, child_entry); |
| } |
| } |
| } |
| |
| static struct ref_cache *get_loose_ref_cache(struct files_ref_store *refs) |
| { |
| if (!refs->loose) { |
| /* |
| * Mark the top-level directory complete because we |
| * are about to read the only subdirectory that can |
| * hold references: |
| */ |
| refs->loose = create_ref_cache(&refs->base, loose_fill_ref_dir); |
| |
| /* We're going to fill the top level ourselves: */ |
| refs->loose->root->flag &= ~REF_INCOMPLETE; |
| |
| /* |
| * Add an incomplete entry for "refs/" (to be filled |
| * lazily): |
| */ |
| add_entry_to_dir(get_ref_dir(refs->loose->root), |
| create_dir_entry(refs->loose, "refs/", 5, 1)); |
| } |
| return refs->loose; |
| } |
| |
| static int files_read_raw_ref(struct ref_store *ref_store, |
| const char *refname, struct object_id *oid, |
| struct strbuf *referent, unsigned int *type) |
| { |
| struct files_ref_store *refs = |
| files_downcast(ref_store, REF_STORE_READ, "read_raw_ref"); |
| struct strbuf sb_contents = STRBUF_INIT; |
| struct strbuf sb_path = STRBUF_INIT; |
| const char *path; |
| const char *buf; |
| const char *p; |
| struct stat st; |
| int fd; |
| int ret = -1; |
| int save_errno; |
| int remaining_retries = 3; |
| |
| *type = 0; |
| strbuf_reset(&sb_path); |
| |
| files_ref_path(refs, &sb_path, refname); |
| |
| path = sb_path.buf; |
| |
| stat_ref: |
| /* |
| * We might have to loop back here to avoid a race |
| * condition: first we lstat() the file, then we try |
| * to read it as a link or as a file. But if somebody |
| * changes the type of the file (file <-> directory |
| * <-> symlink) between the lstat() and reading, then |
| * we don't want to report that as an error but rather |
| * try again starting with the lstat(). |
| * |
| * We'll keep a count of the retries, though, just to avoid |
| * any confusing situation sending us into an infinite loop. |
| */ |
| |
| if (remaining_retries-- <= 0) |
| goto out; |
| |
| if (lstat(path, &st) < 0) { |
| if (errno != ENOENT) |
| goto out; |
| if (refs_read_raw_ref(refs->packed_ref_store, refname, |
| oid, referent, type)) { |
| errno = ENOENT; |
| goto out; |
| } |
| ret = 0; |
| goto out; |
| } |
| |
| /* Follow "normalized" - ie "refs/.." symlinks by hand */ |
| if (S_ISLNK(st.st_mode)) { |
| strbuf_reset(&sb_contents); |
| if (strbuf_readlink(&sb_contents, path, st.st_size) < 0) { |
| if (errno == ENOENT || errno == EINVAL) |
| /* inconsistent with lstat; retry */ |
| goto stat_ref; |
| else |
| goto out; |
| } |
| if (starts_with(sb_contents.buf, "refs/") && |
| !check_refname_format(sb_contents.buf, 0)) { |
| strbuf_swap(&sb_contents, referent); |
| *type |= REF_ISSYMREF; |
| ret = 0; |
| goto out; |
| } |
| /* |
| * It doesn't look like a refname; fall through to just |
| * treating it like a non-symlink, and reading whatever it |
| * points to. |
| */ |
| } |
| |
| /* Is it a directory? */ |
| if (S_ISDIR(st.st_mode)) { |
| /* |
| * Even though there is a directory where the loose |
| * ref is supposed to be, there could still be a |
| * packed ref: |
| */ |
| if (refs_read_raw_ref(refs->packed_ref_store, refname, |
| oid, referent, type)) { |
| errno = EISDIR; |
| goto out; |
| } |
| ret = 0; |
| goto out; |
| } |
| |
| /* |
| * Anything else, just open it and try to use it as |
| * a ref |
| */ |
| fd = open(path, O_RDONLY); |
| if (fd < 0) { |
| if (errno == ENOENT && !S_ISLNK(st.st_mode)) |
| /* inconsistent with lstat; retry */ |
| goto stat_ref; |
| else |
| goto out; |
| } |
| strbuf_reset(&sb_contents); |
| if (strbuf_read(&sb_contents, fd, 256) < 0) { |
| int save_errno = errno; |
| close(fd); |
| errno = save_errno; |
| goto out; |
| } |
| close(fd); |
| strbuf_rtrim(&sb_contents); |
| buf = sb_contents.buf; |
| if (starts_with(buf, "ref:")) { |
| buf += 4; |
| while (isspace(*buf)) |
| buf++; |
| |
| strbuf_reset(referent); |
| strbuf_addstr(referent, buf); |
| *type |= REF_ISSYMREF; |
| ret = 0; |
| goto out; |
| } |
| |
| /* |
| * Please note that FETCH_HEAD has additional |
| * data after the sha. |
| */ |
| if (parse_oid_hex(buf, oid, &p) || |
| (*p != '\0' && !isspace(*p))) { |
| *type |= REF_ISBROKEN; |
| errno = EINVAL; |
| goto out; |
| } |
| |
| ret = 0; |
| |
| out: |
| save_errno = errno; |
| strbuf_release(&sb_path); |
| strbuf_release(&sb_contents); |
| errno = save_errno; |
| return ret; |
| } |
| |
| static void unlock_ref(struct ref_lock *lock) |
| { |
| rollback_lock_file(&lock->lk); |
| free(lock->ref_name); |
| free(lock); |
| } |
| |
| /* |
| * Lock refname, without following symrefs, and set *lock_p to point |
| * at a newly-allocated lock object. Fill in lock->old_oid, referent, |
| * and type similarly to read_raw_ref(). |
| * |
| * The caller must verify that refname is a "safe" reference name (in |
| * the sense of refname_is_safe()) before calling this function. |
| * |
| * If the reference doesn't already exist, verify that refname doesn't |
| * have a D/F conflict with any existing references. extras and skip |
| * are passed to refs_verify_refname_available() for this check. |
| * |
| * If mustexist is not set and the reference is not found or is |
| * broken, lock the reference anyway but clear old_oid. |
| * |
| * Return 0 on success. On failure, write an error message to err and |
| * return TRANSACTION_NAME_CONFLICT or TRANSACTION_GENERIC_ERROR. |
| * |
| * Implementation note: This function is basically |
| * |
| * lock reference |
| * read_raw_ref() |
| * |
| * but it includes a lot more code to |
| * - Deal with possible races with other processes |
| * - Avoid calling refs_verify_refname_available() when it can be |
| * avoided, namely if we were successfully able to read the ref |
| * - Generate informative error messages in the case of failure |
| */ |
| static int lock_raw_ref(struct files_ref_store *refs, |
| const char *refname, int mustexist, |
| const struct string_list *extras, |
| const struct string_list *skip, |
| struct ref_lock **lock_p, |
| struct strbuf *referent, |
| unsigned int *type, |
| struct strbuf *err) |
| { |
| struct ref_lock *lock; |
| struct strbuf ref_file = STRBUF_INIT; |
| int attempts_remaining = 3; |
| int ret = TRANSACTION_GENERIC_ERROR; |
| |
| assert(err); |
| files_assert_main_repository(refs, "lock_raw_ref"); |
| |
| *type = 0; |
| |
| /* First lock the file so it can't change out from under us. */ |
| |
| *lock_p = lock = xcalloc(1, sizeof(*lock)); |
| |
| lock->ref_name = xstrdup(refname); |
| files_ref_path(refs, &ref_file, refname); |
| |
| retry: |
| switch (safe_create_leading_directories(ref_file.buf)) { |
| case SCLD_OK: |
| break; /* success */ |
| case SCLD_EXISTS: |
| /* |
| * Suppose refname is "refs/foo/bar". We just failed |
| * to create the containing directory, "refs/foo", |
| * because there was a non-directory in the way. This |
| * indicates a D/F conflict, probably because of |
| * another reference such as "refs/foo". There is no |
| * reason to expect this error to be transitory. |
| */ |
| if (refs_verify_refname_available(&refs->base, refname, |
| extras, skip, err)) { |
| if (mustexist) { |
| /* |
| * To the user the relevant error is |
| * that the "mustexist" reference is |
| * missing: |
| */ |
| strbuf_reset(err); |
| strbuf_addf(err, "unable to resolve reference '%s'", |
| refname); |
| } else { |
| /* |
| * The error message set by |
| * refs_verify_refname_available() is |
| * OK. |
| */ |
| ret = TRANSACTION_NAME_CONFLICT; |
| } |
| } else { |
| /* |
| * The file that is in the way isn't a loose |
| * reference. Report it as a low-level |
| * failure. |
| */ |
| strbuf_addf(err, "unable to create lock file %s.lock; " |
| "non-directory in the way", |
| ref_file.buf); |
| } |
| goto error_return; |
| case SCLD_VANISHED: |
| /* Maybe another process was tidying up. Try again. */ |
| if (--attempts_remaining > 0) |
| goto retry; |
| /* fall through */ |
| default: |
| strbuf_addf(err, "unable to create directory for %s", |
| ref_file.buf); |
| goto error_return; |
| } |
| |
| if (hold_lock_file_for_update_timeout( |
| &lock->lk, ref_file.buf, LOCK_NO_DEREF, |
| get_files_ref_lock_timeout_ms()) < 0) { |
| if (errno == ENOENT && --attempts_remaining > 0) { |
| /* |
| * Maybe somebody just deleted one of the |
| * directories leading to ref_file. Try |
| * again: |
| */ |
| goto retry; |
| } else { |
| unable_to_lock_message(ref_file.buf, errno, err); |
| goto error_return; |
| } |
| } |
| |
| /* |
| * Now we hold the lock and can read the reference without |
| * fear that its value will change. |
| */ |
| |
| if (files_read_raw_ref(&refs->base, refname, |
| &lock->old_oid, referent, type)) { |
| if (errno == ENOENT) { |
| if (mustexist) { |
| /* Garden variety missing reference. */ |
| strbuf_addf(err, "unable to resolve reference '%s'", |
| refname); |
| goto error_return; |
| } else { |
| /* |
| * Reference is missing, but that's OK. We |
| * know that there is not a conflict with |
| * another loose reference because |
| * (supposing that we are trying to lock |
| * reference "refs/foo/bar"): |
| * |
| * - We were successfully able to create |
| * the lockfile refs/foo/bar.lock, so we |
| * know there cannot be a loose reference |
| * named "refs/foo". |
| * |
| * - We got ENOENT and not EISDIR, so we |
| * know that there cannot be a loose |
| * reference named "refs/foo/bar/baz". |
| */ |
| } |
| } else if (errno == EISDIR) { |
| /* |
| * There is a directory in the way. It might have |
| * contained references that have been deleted. If |
| * we don't require that the reference already |
| * exists, try to remove the directory so that it |
| * doesn't cause trouble when we want to rename the |
| * lockfile into place later. |
| */ |
| if (mustexist) { |
| /* Garden variety missing reference. */ |
| strbuf_addf(err, "unable to resolve reference '%s'", |
| refname); |
| goto error_return; |
| } else if (remove_dir_recursively(&ref_file, |
| REMOVE_DIR_EMPTY_ONLY)) { |
| if (refs_verify_refname_available( |
| &refs->base, refname, |
| extras, skip, err)) { |
| /* |
| * The error message set by |
| * verify_refname_available() is OK. |
| */ |
| ret = TRANSACTION_NAME_CONFLICT; |
| goto error_return; |
| } else { |
| /* |
| * We can't delete the directory, |
| * but we also don't know of any |
| * references that it should |
| * contain. |
| */ |
| strbuf_addf(err, "there is a non-empty directory '%s' " |
| "blocking reference '%s'", |
| ref_file.buf, refname); |
| goto error_return; |
| } |
| } |
| } else if (errno == EINVAL && (*type & REF_ISBROKEN)) { |
| strbuf_addf(err, "unable to resolve reference '%s': " |
| "reference broken", refname); |
| goto error_return; |
| } else { |
| strbuf_addf(err, "unable to resolve reference '%s': %s", |
| refname, strerror(errno)); |
| goto error_return; |
| } |
| |
| /* |
| * If the ref did not exist and we are creating it, |
| * make sure there is no existing packed ref that |
| * conflicts with refname: |
| */ |
| if (refs_verify_refname_available( |
| refs->packed_ref_store, refname, |
| extras, skip, err)) |
| goto error_return; |
| } |
| |
| ret = 0; |
| goto out; |
| |
| error_return: |
| unlock_ref(lock); |
| *lock_p = NULL; |
| |
| out: |
| strbuf_release(&ref_file); |
| return ret; |
| } |
| |
| struct files_ref_iterator { |
| struct ref_iterator base; |
| |
| struct ref_iterator *iter0; |
| unsigned int flags; |
| }; |
| |
| static int files_ref_iterator_advance(struct ref_iterator *ref_iterator) |
| { |
| struct files_ref_iterator *iter = |
| (struct files_ref_iterator *)ref_iterator; |
| int ok; |
| |
| while ((ok = ref_iterator_advance(iter->iter0)) == ITER_OK) { |
| if (iter->flags & DO_FOR_EACH_PER_WORKTREE_ONLY && |
| ref_type(iter->iter0->refname) != REF_TYPE_PER_WORKTREE) |
| continue; |
| |
| if (!(iter->flags & DO_FOR_EACH_INCLUDE_BROKEN) && |
| !ref_resolves_to_object(iter->iter0->refname, |
| iter->iter0->oid, |
| iter->iter0->flags)) |
| continue; |
| |
| iter->base.refname = iter->iter0->refname; |
| iter->base.oid = iter->iter0->oid; |
| iter->base.flags = iter->iter0->flags; |
| return ITER_OK; |
| } |
| |
| iter->iter0 = NULL; |
| if (ref_iterator_abort(ref_iterator) != ITER_DONE) |
| ok = ITER_ERROR; |
| |
| return ok; |
| } |
| |
| static int files_ref_iterator_peel(struct ref_iterator *ref_iterator, |
| struct object_id *peeled) |
| { |
| struct files_ref_iterator *iter = |
| (struct files_ref_iterator *)ref_iterator; |
| |
| return ref_iterator_peel(iter->iter0, peeled); |
| } |
| |
| static int files_ref_iterator_abort(struct ref_iterator *ref_iterator) |
| { |
| struct files_ref_iterator *iter = |
| (struct files_ref_iterator *)ref_iterator; |
| int ok = ITER_DONE; |
| |
| if (iter->iter0) |
| ok = ref_iterator_abort(iter->iter0); |
| |
| base_ref_iterator_free(ref_iterator); |
| return ok; |
| } |
| |
| static struct ref_iterator_vtable files_ref_iterator_vtable = { |
| files_ref_iterator_advance, |
| files_ref_iterator_peel, |
| files_ref_iterator_abort |
| }; |
| |
| static struct ref_iterator *files_ref_iterator_begin( |
| struct ref_store *ref_store, |
| const char *prefix, unsigned int flags) |
| { |
| struct files_ref_store *refs; |
| struct ref_iterator *loose_iter, *packed_iter, *overlay_iter; |
| struct files_ref_iterator *iter; |
| struct ref_iterator *ref_iterator; |
| unsigned int required_flags = REF_STORE_READ; |
| |
| if (!(flags & DO_FOR_EACH_INCLUDE_BROKEN)) |
| required_flags |= REF_STORE_ODB; |
| |
| refs = files_downcast(ref_store, required_flags, "ref_iterator_begin"); |
| |
| /* |
| * We must make sure that all loose refs are read before |
| * accessing the packed-refs file; this avoids a race |
| * condition if loose refs are migrated to the packed-refs |
| * file by a simultaneous process, but our in-memory view is |
| * from before the migration. We ensure this as follows: |
| * First, we call start the loose refs iteration with its |
| * `prime_ref` argument set to true. This causes the loose |
| * references in the subtree to be pre-read into the cache. |
| * (If they've already been read, that's OK; we only need to |
| * guarantee that they're read before the packed refs, not |
| * *how much* before.) After that, we call |
| * packed_ref_iterator_begin(), which internally checks |
| * whether the packed-ref cache is up to date with what is on |
| * disk, and re-reads it if not. |
| */ |
| |
| loose_iter = cache_ref_iterator_begin(get_loose_ref_cache(refs), |
| prefix, 1); |
| |
| /* |
| * The packed-refs file might contain broken references, for |
| * example an old version of a reference that points at an |
| * object that has since been garbage-collected. This is OK as |
| * long as there is a corresponding loose reference that |
| * overrides it, and we don't want to emit an error message in |
| * this case. So ask the packed_ref_store for all of its |
| * references, and (if needed) do our own check for broken |
| * ones in files_ref_iterator_advance(), after we have merged |
| * the packed and loose references. |
| */ |
| packed_iter = refs_ref_iterator_begin( |
| refs->packed_ref_store, prefix, 0, |
| DO_FOR_EACH_INCLUDE_BROKEN); |
| |
| overlay_iter = overlay_ref_iterator_begin(loose_iter, packed_iter); |
| |
| iter = xcalloc(1, sizeof(*iter)); |
| ref_iterator = &iter->base; |
| base_ref_iterator_init(ref_iterator, &files_ref_iterator_vtable, |
| overlay_iter->ordered); |
| iter->iter0 = overlay_iter; |
| iter->flags = flags; |
| |
| return ref_iterator; |
| } |
| |
| /* |
| * Verify that the reference locked by lock has the value old_oid |
| * (unless it is NULL). Fail if the reference doesn't exist and |
| * mustexist is set. Return 0 on success. On error, write an error |
| * message to err, set errno, and return a negative value. |
| */ |
| static int verify_lock(struct ref_store *ref_store, struct ref_lock *lock, |
| const struct object_id *old_oid, int mustexist, |
| struct strbuf *err) |
| { |
| assert(err); |
| |
| if (refs_read_ref_full(ref_store, lock->ref_name, |
| mustexist ? RESOLVE_REF_READING : 0, |
| &lock->old_oid, NULL)) { |
| if (old_oid) { |
| int save_errno = errno; |
| strbuf_addf(err, "can't verify ref '%s'", lock->ref_name); |
| errno = save_errno; |
| return -1; |
| } else { |
| oidclr(&lock->old_oid); |
| return 0; |
| } |
| } |
| if (old_oid && !oideq(&lock->old_oid, old_oid)) { |
| strbuf_addf(err, "ref '%s' is at %s but expected %s", |
| lock->ref_name, |
| oid_to_hex(&lock->old_oid), |
| oid_to_hex(old_oid)); |
| errno = EBUSY; |
| return -1; |
| } |
| return 0; |
| } |
| |
| static int remove_empty_directories(struct strbuf *path) |
| { |
| /* |
| * we want to create a file but there is a directory there; |
| * if that is an empty directory (or a directory that contains |
| * only empty directories), remove them. |
| */ |
| return remove_dir_recursively(path, REMOVE_DIR_EMPTY_ONLY); |
| } |
| |
| static int create_reflock(const char *path, void *cb) |
| { |
| struct lock_file *lk = cb; |
| |
| return hold_lock_file_for_update_timeout( |
| lk, path, LOCK_NO_DEREF, |
| get_files_ref_lock_timeout_ms()) < 0 ? -1 : 0; |
| } |
| |
| /* |
| * Locks a ref returning the lock on success and NULL on failure. |
| * On failure errno is set to something meaningful. |
| */ |
| static struct ref_lock *lock_ref_oid_basic(struct files_ref_store *refs, |
| const char *refname, |
| const struct object_id *old_oid, |
| const struct string_list *extras, |
| const struct string_list *skip, |
| unsigned int flags, int *type, |
| struct strbuf *err) |
| { |
| struct strbuf ref_file = STRBUF_INIT; |
| struct ref_lock *lock; |
| int last_errno = 0; |
| int mustexist = (old_oid && !is_null_oid(old_oid)); |
| int resolve_flags = RESOLVE_REF_NO_RECURSE; |
| int resolved; |
| |
| files_assert_main_repository(refs, "lock_ref_oid_basic"); |
| assert(err); |
| |
| lock = xcalloc(1, sizeof(struct ref_lock)); |
| |
| if (mustexist) |
| resolve_flags |= RESOLVE_REF_READING; |
| if (flags & REF_DELETING) |
| resolve_flags |= RESOLVE_REF_ALLOW_BAD_NAME; |
| |
| files_ref_path(refs, &ref_file, refname); |
| resolved = !!refs_resolve_ref_unsafe(&refs->base, |
| refname, resolve_flags, |
| &lock->old_oid, type); |
| if (!resolved && errno == EISDIR) { |
| /* |
| * we are trying to lock foo but we used to |
| * have foo/bar which now does not exist; |
| * it is normal for the empty directory 'foo' |
| * to remain. |
| */ |
| if (remove_empty_directories(&ref_file)) { |
| last_errno = errno; |
| if (!refs_verify_refname_available( |
| &refs->base, |
| refname, extras, skip, err)) |
| strbuf_addf(err, "there are still refs under '%s'", |
| refname); |
| goto error_return; |
| } |
| resolved = !!refs_resolve_ref_unsafe(&refs->base, |
| refname, resolve_flags, |
| &lock->old_oid, type); |
| } |
| if (!resolved) { |
| last_errno = errno; |
| if (last_errno != ENOTDIR || |
| !refs_verify_refname_available(&refs->base, refname, |
| extras, skip, err)) |
| strbuf_addf(err, "unable to resolve reference '%s': %s", |
| refname, strerror(last_errno)); |
| |
| goto error_return; |
| } |
| |
| /* |
| * If the ref did not exist and we are creating it, make sure |
| * there is no existing packed ref whose name begins with our |
| * refname, nor a packed ref whose name is a proper prefix of |
| * our refname. |
| */ |
| if (is_null_oid(&lock->old_oid) && |
| refs_verify_refname_available(refs->packed_ref_store, refname, |
| extras, skip, err)) { |
| last_errno = ENOTDIR; |
| goto error_return; |
| } |
| |
| lock->ref_name = xstrdup(refname); |
| |
| if (raceproof_create_file(ref_file.buf, create_reflock, &lock->lk)) { |
| last_errno = errno; |
| unable_to_lock_message(ref_file.buf, errno, err); |
| goto error_return; |
| } |
| |
| if (verify_lock(&refs->base, lock, old_oid, mustexist, err)) { |
| last_errno = errno; |
| goto error_return; |
| } |
| goto out; |
| |
| error_return: |
| unlock_ref(lock); |
| lock = NULL; |
| |
| out: |
| strbuf_release(&ref_file); |
| errno = last_errno; |
| return lock; |
| } |
| |
| struct ref_to_prune { |
| struct ref_to_prune *next; |
| struct object_id oid; |
| char name[FLEX_ARRAY]; |
| }; |
| |
| enum { |
| REMOVE_EMPTY_PARENTS_REF = 0x01, |
| REMOVE_EMPTY_PARENTS_REFLOG = 0x02 |
| }; |
| |
| /* |
| * Remove empty parent directories associated with the specified |
| * reference and/or its reflog, but spare [logs/]refs/ and immediate |
| * subdirs. flags is a combination of REMOVE_EMPTY_PARENTS_REF and/or |
| * REMOVE_EMPTY_PARENTS_REFLOG. |
| */ |
| static void try_remove_empty_parents(struct files_ref_store *refs, |
| const char *refname, |
| unsigned int flags) |
| { |
| struct strbuf buf = STRBUF_INIT; |
| struct strbuf sb = STRBUF_INIT; |
| char *p, *q; |
| int i; |
| |
| strbuf_addstr(&buf, refname); |
| p = buf.buf; |
| for (i = 0; i < 2; i++) { /* refs/{heads,tags,...}/ */ |
| while (*p && *p != '/') |
| p++; |
| /* tolerate duplicate slashes; see check_refname_format() */ |
| while (*p == '/') |
| p++; |
| } |
| q = buf.buf + buf.len; |
| while (flags & (REMOVE_EMPTY_PARENTS_REF | REMOVE_EMPTY_PARENTS_REFLOG)) { |
| while (q > p && *q != '/') |
| q--; |
| while (q > p && *(q-1) == '/') |
| q--; |
| if (q == p) |
| break; |
| strbuf_setlen(&buf, q - buf.buf); |
| |
| strbuf_reset(&sb); |
| files_ref_path(refs, &sb, buf.buf); |
| if ((flags & REMOVE_EMPTY_PARENTS_REF) && rmdir(sb.buf)) |
| flags &= ~REMOVE_EMPTY_PARENTS_REF; |
| |
| strbuf_reset(&sb); |
| files_reflog_path(refs, &sb, buf.buf); |
| if ((flags & REMOVE_EMPTY_PARENTS_REFLOG) && rmdir(sb.buf)) |
| flags &= ~REMOVE_EMPTY_PARENTS_REFLOG; |
| } |
| strbuf_release(&buf); |
| strbuf_release(&sb); |
| } |
| |
| /* make sure nobody touched the ref, and unlink */ |
| static void prune_ref(struct files_ref_store *refs, struct ref_to_prune *r) |
| { |
| struct ref_transaction *transaction; |
| struct strbuf err = STRBUF_INIT; |
| int ret = -1; |
| |
| if (check_refname_format(r->name, 0)) |
| return; |
| |
| transaction = ref_store_transaction_begin(&refs->base, &err); |
| if (!transaction) |
| goto cleanup; |
| ref_transaction_add_update( |
| transaction, r->name, |
| REF_NO_DEREF | REF_HAVE_NEW | REF_HAVE_OLD | REF_IS_PRUNING, |
| &null_oid, &r->oid, NULL); |
| if (ref_transaction_commit(transaction, &err)) |
| goto cleanup; |
| |
| ret = 0; |
| |
| cleanup: |
| if (ret) |
| error("%s", err.buf); |
| strbuf_release(&err); |
| ref_transaction_free(transaction); |
| return; |
| } |
| |
| /* |
| * Prune the loose versions of the references in the linked list |
| * `*refs_to_prune`, freeing the entries in the list as we go. |
| */ |
| static void prune_refs(struct files_ref_store *refs, struct ref_to_prune **refs_to_prune) |
| { |
| while (*refs_to_prune) { |
| struct ref_to_prune *r = *refs_to_prune; |
| *refs_to_prune = r->next; |
| prune_ref(refs, r); |
| free(r); |
| } |
| } |
| |
| /* |
| * Return true if the specified reference should be packed. |
| */ |
| static int should_pack_ref(const char *refname, |
| const struct object_id *oid, unsigned int ref_flags, |
| unsigned int pack_flags) |
| { |
| /* Do not pack per-worktree refs: */ |
| if (ref_type(refname) != REF_TYPE_NORMAL) |
| return 0; |
| |
| /* Do not pack non-tags unless PACK_REFS_ALL is set: */ |
| if (!(pack_flags & PACK_REFS_ALL) && !starts_with(refname, "refs/tags/")) |
| return 0; |
| |
| /* Do not pack symbolic refs: */ |
| if (ref_flags & REF_ISSYMREF) |
| return 0; |
| |
| /* Do not pack broken refs: */ |
| if (!ref_resolves_to_object(refname, oid, ref_flags)) |
| return 0; |
| |
| return 1; |
| } |
| |
| static int files_pack_refs(struct ref_store *ref_store, unsigned int flags) |
| { |
| struct files_ref_store *refs = |
| files_downcast(ref_store, REF_STORE_WRITE | REF_STORE_ODB, |
| "pack_refs"); |
| struct ref_iterator *iter; |
| int ok; |
| struct ref_to_prune *refs_to_prune = NULL; |
| struct strbuf err = STRBUF_INIT; |
| struct ref_transaction *transaction; |
| |
| transaction = ref_store_transaction_begin(refs->packed_ref_store, &err); |
| if (!transaction) |
| return -1; |
| |
| packed_refs_lock(refs->packed_ref_store, LOCK_DIE_ON_ERROR, &err); |
| |
| iter = cache_ref_iterator_begin(get_loose_ref_cache(refs), NULL, 0); |
| while ((ok = ref_iterator_advance(iter)) == ITER_OK) { |
| /* |
| * If the loose reference can be packed, add an entry |
| * in the packed ref cache. If the reference should be |
| * pruned, also add it to refs_to_prune. |
| */ |
| if (!should_pack_ref(iter->refname, iter->oid, iter->flags, |
| flags)) |
| continue; |
| |
| /* |
| * Add a reference creation for this reference to the |
| * packed-refs transaction: |
| */ |
| if (ref_transaction_update(transaction, iter->refname, |
| iter->oid, NULL, |
| REF_NO_DEREF, NULL, &err)) |
| die("failure preparing to create packed reference %s: %s", |
| iter->refname, err.buf); |
| |
| /* Schedule the loose reference for pruning if requested. */ |
| if ((flags & PACK_REFS_PRUNE)) { |
| struct ref_to_prune *n; |
| FLEX_ALLOC_STR(n, name, iter->refname); |
| oidcpy(&n->oid, iter->oid); |
| n->next = refs_to_prune; |
| refs_to_prune = n; |
| } |
| } |
| if (ok != ITER_DONE) |
| die("error while iterating over references"); |
| |
| if (ref_transaction_commit(transaction, &err)) |
| die("unable to write new packed-refs: %s", err.buf); |
| |
| ref_transaction_free(transaction); |
| |
| packed_refs_unlock(refs->packed_ref_store); |
| |
| prune_refs(refs, &refs_to_prune); |
| strbuf_release(&err); |
| return 0; |
| } |
| |
| static int files_delete_refs(struct ref_store *ref_store, const char *msg, |
| struct string_list *refnames, unsigned int flags) |
| { |
| struct files_ref_store *refs = |
| files_downcast(ref_store, REF_STORE_WRITE, "delete_refs"); |
| struct strbuf err = STRBUF_INIT; |
| int i, result = 0; |
| |
| if (!refnames->nr) |
| return 0; |
| |
| if (packed_refs_lock(refs->packed_ref_store, 0, &err)) |
| goto error; |
| |
| if (refs_delete_refs(refs->packed_ref_store, msg, refnames, flags)) { |
| packed_refs_unlock(refs->packed_ref_store); |
| goto error; |
| } |
| |
| packed_refs_unlock(refs->packed_ref_store); |
| |
| for (i = 0; i < refnames->nr; i++) { |
| const char *refname = refnames->items[i].string; |
| |
| if (refs_delete_ref(&refs->base, msg, refname, NULL, flags)) |
| result |= error(_("could not remove reference %s"), refname); |
| } |
| |
| strbuf_release(&err); |
| return result; |
| |
| error: |
| /* |
| * If we failed to rewrite the packed-refs file, then it is |
| * unsafe to try to remove loose refs, because doing so might |
| * expose an obsolete packed value for a reference that might |
| * even point at an object that has been garbage collected. |
| */ |
| if (refnames->nr == 1) |
| error(_("could not delete reference %s: %s"), |
| refnames->items[0].string, err.buf); |
| else |
| error(_("could not delete references: %s"), err.buf); |
| |
| strbuf_release(&err); |
| return -1; |
| } |
| |
| /* |
| * People using contrib's git-new-workdir have .git/logs/refs -> |
| * /some/other/path/.git/logs/refs, and that may live on another device. |
| * |
| * IOW, to avoid cross device rename errors, the temporary renamed log must |
| * live into logs/refs. |
| */ |
| #define TMP_RENAMED_LOG "refs/.tmp-renamed-log" |
| |
| struct rename_cb { |
| const char *tmp_renamed_log; |
| int true_errno; |
| }; |
| |
| static int rename_tmp_log_callback(const char *path, void *cb_data) |
| { |
| struct rename_cb *cb = cb_data; |
| |
| if (rename(cb->tmp_renamed_log, path)) { |
| /* |
| * rename(a, b) when b is an existing directory ought |
| * to result in ISDIR, but Solaris 5.8 gives ENOTDIR. |
| * Sheesh. Record the true errno for error reporting, |
| * but report EISDIR to raceproof_create_file() so |
| * that it knows to retry. |
| */ |
| cb->true_errno = errno; |
| if (errno == ENOTDIR) |
| errno = EISDIR; |
| return -1; |
| } else { |
| return 0; |
| } |
| } |
| |
| static int rename_tmp_log(struct files_ref_store *refs, const char *newrefname) |
| { |
| struct strbuf path = STRBUF_INIT; |
| struct strbuf tmp = STRBUF_INIT; |
| struct rename_cb cb; |
| int ret; |
| |
| files_reflog_path(refs, &path, newrefname); |
| files_reflog_path(refs, &tmp, TMP_RENAMED_LOG); |
| cb.tmp_renamed_log = tmp.buf; |
| ret = raceproof_create_file(path.buf, rename_tmp_log_callback, &cb); |
| if (ret) { |
| if (errno == EISDIR) |
| error("directory not empty: %s", path.buf); |
| else |
| error("unable to move logfile %s to %s: %s", |
| tmp.buf, path.buf, |
| strerror(cb.true_errno)); |
| } |
| |
| strbuf_release(&path); |
| strbuf_release(&tmp); |
| return ret; |
| } |
| |
| static int write_ref_to_lockfile(struct ref_lock *lock, |
| const struct object_id *oid, struct strbuf *err); |
| static int commit_ref_update(struct files_ref_store *refs, |
| struct ref_lock *lock, |
| const struct object_id *oid, const char *logmsg, |
| struct strbuf *err); |
| |
| static int files_copy_or_rename_ref(struct ref_store *ref_store, |
| const char *oldrefname, const char *newrefname, |
| const char *logmsg, int copy) |
| { |
| struct files_ref_store *refs = |
| files_downcast(ref_store, REF_STORE_WRITE, "rename_ref"); |
| struct object_id oid, orig_oid; |
| int flag = 0, logmoved = 0; |
| struct ref_lock *lock; |
| struct stat loginfo; |
| struct strbuf sb_oldref = STRBUF_INIT; |
| struct strbuf sb_newref = STRBUF_INIT; |
| struct strbuf tmp_renamed_log = STRBUF_INIT; |
| int log, ret; |
| struct strbuf err = STRBUF_INIT; |
| |
| files_reflog_path(refs, &sb_oldref, oldrefname); |
| files_reflog_path(refs, &sb_newref, newrefname); |
| files_reflog_path(refs, &tmp_renamed_log, TMP_RENAMED_LOG); |
| |
| log = !lstat(sb_oldref.buf, &loginfo); |
| if (log && S_ISLNK(loginfo.st_mode)) { |
| ret = error("reflog for %s is a symlink", oldrefname); |
| goto out; |
| } |
| |
| if (!refs_resolve_ref_unsafe(&refs->base, oldrefname, |
| RESOLVE_REF_READING | RESOLVE_REF_NO_RECURSE, |
| &orig_oid, &flag)) { |
| ret = error("refname %s not found", oldrefname); |
| goto out; |
| } |
| |
| if (flag & REF_ISSYMREF) { |
| if (copy) |
| ret = error("refname %s is a symbolic ref, copying it is not supported", |
| oldrefname); |
| else |
| ret = error("refname %s is a symbolic ref, renaming it is not supported", |
| oldrefname); |
| goto out; |
| } |
| if (!refs_rename_ref_available(&refs->base, oldrefname, newrefname)) { |
| ret = 1; |
| goto out; |
| } |
| |
| if (!copy && log && rename(sb_oldref.buf, tmp_renamed_log.buf)) { |
| ret = error("unable to move logfile logs/%s to logs/"TMP_RENAMED_LOG": %s", |
| oldrefname, strerror(errno)); |
| goto out; |
| } |
| |
| if (copy && log && copy_file(tmp_renamed_log.buf, sb_oldref.buf, 0644)) { |
| ret = error("unable to copy logfile logs/%s to logs/"TMP_RENAMED_LOG": %s", |
| oldrefname, strerror(errno)); |
| goto out; |
| } |
| |
| if (!copy && refs_delete_ref(&refs->base, logmsg, oldrefname, |
| &orig_oid, REF_NO_DEREF)) { |
| error("unable to delete old %s", oldrefname); |
| goto rollback; |
| } |
| |
| /* |
| * Since we are doing a shallow lookup, oid is not the |
| * correct value to pass to delete_ref as old_oid. But that |
| * doesn't matter, because an old_oid check wouldn't add to |
| * the safety anyway; we want to delete the reference whatever |
| * its current value. |
| */ |
| if (!copy && !refs_read_ref_full(&refs->base, newrefname, |
| RESOLVE_REF_READING | RESOLVE_REF_NO_RECURSE, |
| &oid, NULL) && |
| refs_delete_ref(&refs->base, NULL, newrefname, |
| NULL, REF_NO_DEREF)) { |
| if (errno == EISDIR) { |
| struct strbuf path = STRBUF_INIT; |
| int result; |
| |
| files_ref_path(refs, &path, newrefname); |
| result = remove_empty_directories(&path); |
| strbuf_release(&path); |
| |
| if (result) { |
| error("Directory not empty: %s", newrefname); |
| goto rollback; |
| } |
| } else { |
| error("unable to delete existing %s", newrefname); |
| goto rollback; |
| } |
| } |
| |
| if (log && rename_tmp_log(refs, newrefname)) |
| goto rollback; |
| |
| logmoved = log; |
| |
| lock = lock_ref_oid_basic(refs, newrefname, NULL, NULL, NULL, |
| REF_NO_DEREF, NULL, &err); |
| if (!lock) { |
| if (copy) |
| error("unable to copy '%s' to '%s': %s", oldrefname, newrefname, err.buf); |
| else |
| error("unable to rename '%s' to '%s': %s", oldrefname, newrefname, err.buf); |
| strbuf_release(&err); |
| goto rollback; |
| } |
| oidcpy(&lock->old_oid, &orig_oid); |
| |
| if (write_ref_to_lockfile(lock, &orig_oid, &err) || |
| commit_ref_update(refs, lock, &orig_oid, logmsg, &err)) { |
| error("unable to write current sha1 into %s: %s", newrefname, err.buf); |
| strbuf_release(&err); |
| goto rollback; |
| } |
| |
| ret = 0; |
| goto out; |
| |
| rollback: |
| lock = lock_ref_oid_basic(refs, oldrefname, NULL, NULL, NULL, |
| REF_NO_DEREF, NULL, &err); |
| if (!lock) { |
| error("unable to lock %s for rollback: %s", oldrefname, err.buf); |
| strbuf_release(&err); |
| goto rollbacklog; |
| } |
| |
| flag = log_all_ref_updates; |
| log_all_ref_updates = LOG_REFS_NONE; |
| if (write_ref_to_lockfile(lock, &orig_oid, &err) || |
| commit_ref_update(refs, lock, &orig_oid, NULL, &err)) { |
| error("unable to write current sha1 into %s: %s", oldrefname, err.buf); |
| strbuf_release(&err); |
| } |
| log_all_ref_updates = flag; |
| |
| rollbacklog: |
| if (logmoved && rename(sb_newref.buf, sb_oldref.buf)) |
| error("unable to restore logfile %s from %s: %s", |
| oldrefname, newrefname, strerror(errno)); |
| if (!logmoved && log && |
| rename(tmp_renamed_log.buf, sb_oldref.buf)) |
| error("unable to restore logfile %s from logs/"TMP_RENAMED_LOG": %s", |
| oldrefname, strerror(errno)); |
| ret = 1; |
| out: |
| strbuf_release(&sb_newref); |
| strbuf_release(&sb_oldref); |
| strbuf_release(&tmp_renamed_log); |
| |
| return ret; |
| } |
| |
| static int files_rename_ref(struct ref_store *ref_store, |
| const char *oldrefname, const char *newrefname, |
| const char *logmsg) |
| { |
| return files_copy_or_rename_ref(ref_store, oldrefname, |
| newrefname, logmsg, 0); |
| } |
| |
| static int files_copy_ref(struct ref_store *ref_store, |
| const char *oldrefname, const char *newrefname, |
| const char *logmsg) |
| { |
| return files_copy_or_rename_ref(ref_store, oldrefname, |
| newrefname, logmsg, 1); |
| } |
| |
| static int close_ref_gently(struct ref_lock *lock) |
| { |
| if (close_lock_file_gently(&lock->lk)) |
| return -1; |
| return 0; |
| } |
| |
| static int commit_ref(struct ref_lock *lock) |
| { |
| char *path = get_locked_file_path(&lock->lk); |
| struct stat st; |
| |
| if (!lstat(path, &st) && S_ISDIR(st.st_mode)) { |
| /* |
| * There is a directory at the path we want to rename |
| * the lockfile to. Hopefully it is empty; try to |
| * delete it. |
| */ |
| size_t len = strlen(path); |
| struct strbuf sb_path = STRBUF_INIT; |
| |
| strbuf_attach(&sb_path, path, len, len); |
| |
| /* |
| * If this fails, commit_lock_file() will also fail |
| * and will report the problem. |
| */ |
| remove_empty_directories(&sb_path); |
| strbuf_release(&sb_path); |
| } else { |
| free(path); |
| } |
| |
| if (commit_lock_file(&lock->lk)) |
| return -1; |
| return 0; |
| } |
| |
| static int open_or_create_logfile(const char *path, void *cb) |
| { |
| int *fd = cb; |
| |
| *fd = open(path, O_APPEND | O_WRONLY | O_CREAT, 0666); |
| return (*fd < 0) ? -1 : 0; |
| } |
| |
| /* |
| * Create a reflog for a ref. If force_create = 0, only create the |
| * reflog for certain refs (those for which should_autocreate_reflog |
| * returns non-zero). Otherwise, create it regardless of the reference |
| * name. If the logfile already existed or was created, return 0 and |
| * set *logfd to the file descriptor opened for appending to the file. |
| * If no logfile exists and we decided not to create one, return 0 and |
| * set *logfd to -1. On failure, fill in *err, set *logfd to -1, and |
| * return -1. |
| */ |
| static int log_ref_setup(struct files_ref_store *refs, |
| const char *refname, int force_create, |
| int *logfd, struct strbuf *err) |
| { |
| struct strbuf logfile_sb = STRBUF_INIT; |
| char *logfile; |
| |
| files_reflog_path(refs, &logfile_sb, refname); |
| logfile = strbuf_detach(&logfile_sb, NULL); |
| |
| if (force_create || should_autocreate_reflog(refname)) { |
| if (raceproof_create_file(logfile, open_or_create_logfile, logfd)) { |
| if (errno == ENOENT) |
| strbuf_addf(err, "unable to create directory for '%s': " |
| "%s", logfile, strerror(errno)); |
| else if (errno == EISDIR) |
| strbuf_addf(err, "there are still logs under '%s'", |
| logfile); |
| else |
| strbuf_addf(err, "unable to append to '%s': %s", |
| logfile, strerror(errno)); |
| |
| goto error; |
| } |
| } else { |
| *logfd = open(logfile, O_APPEND | O_WRONLY, 0666); |
| if (*logfd < 0) { |
| if (errno == ENOENT || errno == EISDIR) { |
| /* |
| * The logfile doesn't already exist, |
| * but that is not an error; it only |
| * means that we won't write log |
| * entries to it. |
| */ |
| ; |
| } else { |
| strbuf_addf(err, "unable to append to '%s': %s", |
| logfile, strerror(errno)); |
| goto error; |
| } |
| } |
| } |
| |
| if (*logfd >= 0) |
| adjust_shared_perm(logfile); |
| |
| free(logfile); |
| return 0; |
| |
| error: |
| free(logfile); |
| return -1; |
| } |
| |
| static int files_create_reflog(struct ref_store *ref_store, |
| const char *refname, int force_create, |
| struct strbuf *err) |
| { |
| struct files_ref_store *refs = |
| files_downcast(ref_store, REF_STORE_WRITE, "create_reflog"); |
| int fd; |
| |
| if (log_ref_setup(refs, refname, force_create, &fd, err)) |
| return -1; |
| |
| if (fd >= 0) |
| close(fd); |
| |
| return 0; |
| } |
| |
| static int log_ref_write_fd(int fd, const struct object_id *old_oid, |
| const struct object_id *new_oid, |
| const char *committer, const char *msg) |
| { |
| struct strbuf sb = STRBUF_INIT; |
| int ret = 0; |
| |
| strbuf_addf(&sb, "%s %s %s", oid_to_hex(old_oid), oid_to_hex(new_oid), committer); |
| if (msg && *msg) |
| copy_reflog_msg(&sb, msg); |
| strbuf_addch(&sb, '\n'); |
| if (write_in_full(fd, sb.buf, sb.len) < 0) |
| ret = -1; |
| strbuf_release(&sb); |
| return ret; |
| } |
| |
| static int files_log_ref_write(struct files_ref_store *refs, |
| const char *refname, const struct object_id *old_oid, |
| const struct object_id *new_oid, const char *msg, |
| int flags, struct strbuf *err) |
| { |
| int logfd, result; |
| |
| if (log_all_ref_updates == LOG_REFS_UNSET) |
| log_all_ref_updates = is_bare_repository() ? LOG_REFS_NONE : LOG_REFS_NORMAL; |
| |
| result = log_ref_setup(refs, refname, |
| flags & REF_FORCE_CREATE_REFLOG, |
| &logfd, err); |
| |
| if (result) |
| return result; |
| |
| if (logfd < 0) |
| return 0; |
| result = log_ref_write_fd(logfd, old_oid, new_oid, |
| git_committer_info(0), msg); |
| if (result) { |
| struct strbuf sb = STRBUF_INIT; |
| int save_errno = errno; |
| |
| files_reflog_path(refs, &sb, refname); |
| strbuf_addf(err, "unable to append to '%s': %s", |
| sb.buf, strerror(save_errno)); |
| strbuf_release(&sb); |
| close(logfd); |
| return -1; |
| } |
| if (close(logfd)) { |
| struct strbuf sb = STRBUF_INIT; |
| int save_errno = errno; |
| |
| files_reflog_path(refs, &sb, refname); |
| strbuf_addf(err, "unable to append to '%s': %s", |
| sb.buf, strerror(save_errno)); |
| strbuf_release(&sb); |
| return -1; |
| } |
| return 0; |
| } |
| |
| /* |
| * Write oid into the open lockfile, then close the lockfile. On |
| * errors, rollback the lockfile, fill in *err and return -1. |
| */ |
| static int write_ref_to_lockfile(struct ref_lock *lock, |
| const struct object_id *oid, struct strbuf *err) |
| { |
| static char term = '\n'; |
| struct object *o; |
| int fd; |
| |
| o = parse_object(the_repository, oid); |
| if (!o) { |
| strbuf_addf(err, |
| "trying to write ref '%s' with nonexistent object %s", |
| lock->ref_name, oid_to_hex(oid)); |
| unlock_ref(lock); |
| return -1; |
| } |
| if (o->type != OBJ_COMMIT && is_branch(lock->ref_name)) { |
| strbuf_addf(err, |
| "trying to write non-commit object %s to branch '%s'", |
| oid_to_hex(oid), lock->ref_name); |
| unlock_ref(lock); |
| return -1; |
| } |
| fd = get_lock_file_fd(&lock->lk); |
| if (write_in_full(fd, oid_to_hex(oid), the_hash_algo->hexsz) < 0 || |
| write_in_full(fd, &term, 1) < 0 || |
| close_ref_gently(lock) < 0) { |
| strbuf_addf(err, |
| "couldn't write '%s'", get_lock_file_path(&lock->lk)); |
| unlock_ref(lock); |
| return -1; |
| } |
| return 0; |
| } |
| |
| /* |
| * Commit a change to a loose reference that has already been written |
| * to the loose reference lockfile. Also update the reflogs if |
| * necessary, using the specified lockmsg (which can be NULL). |
| */ |
| static int commit_ref_update(struct files_ref_store *refs, |
| struct ref_lock *lock, |
| const struct object_id *oid, const char *logmsg, |
| struct strbuf *err) |
| { |
| files_assert_main_repository(refs, "commit_ref_update"); |
| |
| clear_loose_ref_cache(refs); |
| if (files_log_ref_write(refs, lock->ref_name, |
| &lock->old_oid, oid, |
| logmsg, 0, err)) { |
| char *old_msg = strbuf_detach(err, NULL); |
| strbuf_addf(err, "cannot update the ref '%s': %s", |
| lock->ref_name, old_msg); |
| free(old_msg); |
| unlock_ref(lock); |
| return -1; |
| } |
| |
| if (strcmp(lock->ref_name, "HEAD") != 0) { |
| /* |
| * Special hack: If a branch is updated directly and HEAD |
| * points to it (may happen on the remote side of a push |
| * for example) then logically the HEAD reflog should be |
| * updated too. |
| * A generic solution implies reverse symref information, |
| * but finding all symrefs pointing to the given branch |
| * would be rather costly for this rare event (the direct |
| * update of a branch) to be worth it. So let's cheat and |
| * check with HEAD only which should cover 99% of all usage |
| * scenarios (even 100% of the default ones). |
| */ |
| int head_flag; |
| const char *head_ref; |
| |
| head_ref = refs_resolve_ref_unsafe(&refs->base, "HEAD", |
| RESOLVE_REF_READING, |
| NULL, &head_flag); |
| if (head_ref && (head_flag & REF_ISSYMREF) && |
| !strcmp(head_ref, lock->ref_name)) { |
| struct strbuf log_err = STRBUF_INIT; |
| if (files_log_ref_write(refs, "HEAD", |
| &lock->old_oid, oid, |
| logmsg, 0, &log_err)) { |
| error("%s", log_err.buf); |
| strbuf_release(&log_err); |
| } |
| } |
| } |
| |
| if (commit_ref(lock)) { |
| strbuf_addf(err, "couldn't set '%s'", lock->ref_name); |
| unlock_ref(lock); |
| return -1; |
| } |
| |
| unlock_ref(lock); |
| return 0; |
| } |
| |
| static int create_ref_symlink(struct ref_lock *lock, const char *target) |
| { |
| int ret = -1; |
| #ifndef NO_SYMLINK_HEAD |
| char *ref_path = get_locked_file_path(&lock->lk); |
| unlink(ref_path); |
| ret = symlink(target, ref_path); |
| free(ref_path); |
| |
| if (ret) |
| fprintf(stderr, "no symlink - falling back to symbolic ref\n"); |
| #endif |
| return ret; |
| } |
| |
| static void update_symref_reflog(struct files_ref_store *refs, |
| struct ref_lock *lock, const char *refname, |
| const char *target, const char *logmsg) |
| { |
| struct strbuf err = STRBUF_INIT; |
| struct object_id new_oid; |
| if (logmsg && |
| !refs_read_ref_full(&refs->base, target, |
| RESOLVE_REF_READING, &new_oid, NULL) && |
| files_log_ref_write(refs, refname, &lock->old_oid, |
| &new_oid, logmsg, 0, &err)) { |
| error("%s", err.buf); |
| strbuf_release(&err); |
| } |
| } |
| |
| static int create_symref_locked(struct files_ref_store *refs, |
| struct ref_lock *lock, const char *refname, |
| const char *target, const char *logmsg) |
| { |
| if (prefer_symlink_refs && !create_ref_symlink(lock, target)) { |
| update_symref_reflog(refs, lock, refname, target, logmsg); |
| return 0; |
| } |
| |
| if (!fdopen_lock_file(&lock->lk, "w")) |
| return error("unable to fdopen %s: %s", |
| lock->lk.tempfile->filename.buf, strerror(errno)); |
| |
| update_symref_reflog(refs, lock, refname, target, logmsg); |
| |
| /* no error check; commit_ref will check ferror */ |
| fprintf(lock->lk.tempfile->fp, "ref: %s\n", target); |
| if (commit_ref(lock) < 0) |
| return error("unable to write symref for %s: %s", refname, |
| strerror(errno)); |
| return 0; |
| } |
| |
| static int files_create_symref(struct ref_store *ref_store, |
| const char *refname, const char *target, |
| const char *logmsg) |
| { |
| struct files_ref_store *refs = |
| files_downcast(ref_store, REF_STORE_WRITE, "create_symref"); |
| struct strbuf err = STRBUF_INIT; |
| struct ref_lock *lock; |
| int ret; |
| |
| lock = lock_ref_oid_basic(refs, refname, NULL, |
| NULL, NULL, REF_NO_DEREF, NULL, |
| &err); |
| if (!lock) { |
| error("%s", err.buf); |
| strbuf_release(&err); |
| return -1; |
| } |
| |
| ret = create_symref_locked(refs, lock, refname, target, logmsg); |
| unlock_ref(lock); |
| return ret; |
| } |
| |
| static int files_reflog_exists(struct ref_store *ref_store, |
| const char *refname) |
| { |
| struct files_ref_store *refs = |
| files_downcast(ref_store, REF_STORE_READ, "reflog_exists"); |
| struct strbuf sb = STRBUF_INIT; |
| struct stat st; |
| int ret; |
| |
| files_reflog_path(refs, &sb, refname); |
| ret = !lstat(sb.buf, &st) && S_ISREG(st.st_mode); |
| strbuf_release(&sb); |
| return ret; |
| } |
| |
| static int files_delete_reflog(struct ref_store *ref_store, |
| const char *refname) |
| { |
| struct files_ref_store *refs = |
| files_downcast(ref_store, REF_STORE_WRITE, "delete_reflog"); |
| struct strbuf sb = STRBUF_INIT; |
| int ret; |
| |
| files_reflog_path(refs, &sb, refname); |
| ret = remove_path(sb.buf); |
| strbuf_release(&sb); |
| return ret; |
| } |
| |
| static int show_one_reflog_ent(struct strbuf *sb, each_reflog_ent_fn fn, void *cb_data) |
| { |
| struct object_id ooid, noid; |
| char *email_end, *message; |
| timestamp_t timestamp; |
| int tz; |
| const char *p = sb->buf; |
| |
| /* old SP new SP name <email> SP time TAB msg LF */ |
| if (!sb->len || sb->buf[sb->len - 1] != '\n' || |
| parse_oid_hex(p, &ooid, &p) || *p++ != ' ' || |
| parse_oid_hex(p, &noid, &p) || *p++ != ' ' || |
| !(email_end = strchr(p, '>')) || |
| email_end[1] != ' ' || |
| !(timestamp = parse_timestamp(email_end + 2, &message, 10)) || |
| !message || message[0] != ' ' || |
| (message[1] != '+' && message[1] != '-') || |
| !isdigit(message[2]) || !isdigit(message[3]) || |
| !isdigit(message[4]) || !isdigit(message[5])) |
| return 0; /* corrupt? */ |
| email_end[1] = '\0'; |
| tz = strtol(message + 1, NULL, 10); |
| if (message[6] != '\t') |
| message += 6; |
| else |
| message += 7; |
| return fn(&ooid, &noid, p, timestamp, tz, message, cb_data); |
| } |
| |
| static char *find_beginning_of_line(char *bob, char *scan) |
| { |
| while (bob < scan && *(--scan) != '\n') |
| ; /* keep scanning backwards */ |
| /* |
| * Return either beginning of the buffer, or LF at the end of |
| * the previous line. |
| */ |
| return scan; |
| } |
| |
| static int files_for_each_reflog_ent_reverse(struct ref_store *ref_store, |
| const char *refname, |
| each_reflog_ent_fn fn, |
| void *cb_data) |
| { |
| struct files_ref_store *refs = |
| files_downcast(ref_store, REF_STORE_READ, |
| "for_each_reflog_ent_reverse"); |
| struct strbuf sb = STRBUF_INIT; |
| FILE *logfp; |
| long pos; |
| int ret = 0, at_tail = 1; |
| |
| files_reflog_path(refs, &sb, refname); |
| logfp = fopen(sb.buf, "r"); |
| strbuf_release(&sb); |
| if (!logfp) |
| return -1; |
| |
| /* Jump to the end */ |
| if (fseek(logfp, 0, SEEK_END) < 0) |
| ret = error("cannot seek back reflog for %s: %s", |
| refname, strerror(errno)); |
| pos = ftell(logfp); |
| while (!ret && 0 < pos) { |
| int cnt; |
| size_t nread; |
| char buf[BUFSIZ]; |
| char *endp, *scanp; |
| |
| /* Fill next block from the end */ |
| cnt = (sizeof(buf) < pos) ? sizeof(buf) : pos; |
| if (fseek(logfp, pos - cnt, SEEK_SET)) { |
| ret = error("cannot seek back reflog for %s: %s", |
| refname, strerror(errno)); |
| break; |
| } |
| nread = fread(buf, cnt, 1, logfp); |
| if (nread != 1) { |
| ret = error("cannot read %d bytes from reflog for %s: %s", |
| cnt, refname, strerror(errno)); |
| break; |
| } |
| pos -= cnt; |
| |
| scanp = endp = buf + cnt; |
| if (at_tail && scanp[-1] == '\n') |
| /* Looking at the final LF at the end of the file */ |
| scanp--; |
| at_tail = 0; |
| |
| while (buf < scanp) { |
| /* |
| * terminating LF of the previous line, or the beginning |
| * of the buffer. |
| */ |
| char *bp; |
| |
| bp = find_beginning_of_line(buf, scanp); |
| |
| if (*bp == '\n') { |
| /* |
| * The newline is the end of the previous line, |
| * so we know we have complete line starting |
| * at (bp + 1). Prefix it onto any prior data |
| * we collected for the line and process it. |
| */ |
| strbuf_splice(&sb, 0, 0, bp + 1, endp - (bp + 1)); |
| scanp = bp; |
| endp = bp + 1; |
| ret = show_one_reflog_ent(&sb, fn, cb_data); |
| strbuf_reset(&sb); |
| if (ret) |
| break; |
| } else if (!pos) { |
| /* |
| * We are at the start of the buffer, and the |
| * start of the file; there is no previous |
| * line, and we have everything for this one. |
| * Process it, and we can end the loop. |
| */ |
| strbuf_splice(&sb, 0, 0, buf, endp - buf); |
| ret = show_one_reflog_ent(&sb, fn, cb_data); |
| strbuf_reset(&sb); |
| break; |
| } |
| |
| if (bp == buf) { |
| /* |
| * We are at the start of the buffer, and there |
| * is more file to read backwards. Which means |
| * we are in the middle of a line. Note that we |
| * may get here even if *bp was a newline; that |
| * just means we are at the exact end of the |
| * previous line, rather than some spot in the |
| * middle. |
| * |
| * Save away what we have to be combined with |
| * the data from the next read. |
| */ |
| strbuf_splice(&sb, 0, 0, buf, endp - buf); |
| break; |
| } |
| } |
| |
| } |
| if (!ret && sb.len) |
| BUG("reverse reflog parser had leftover data"); |
| |
| fclose(logfp); |
| strbuf_release(&sb); |
| return ret; |
| } |
| |
| static int files_for_each_reflog_ent(struct ref_store *ref_store, |
| const char *refname, |
| each_reflog_ent_fn fn, void *cb_data) |
| { |
| struct files_ref_store *refs = |
| files_downcast(ref_store, REF_STORE_READ, |
| "for_each_reflog_ent"); |
| FILE *logfp; |
| struct strbuf sb = STRBUF_INIT; |
| int ret = 0; |
| |
| files_reflog_path(refs, &sb, refname); |
| logfp = fopen(sb.buf, "r"); |
| strbuf_release(&sb); |
| if (!logfp) |
| return -1; |
| |
| while (!ret && !strbuf_getwholeline(&sb, logfp, '\n')) |
| ret = show_one_reflog_ent(&sb, fn, cb_data); |
| fclose(logfp); |
| strbuf_release(&sb); |
| return ret; |
| } |
| |
| struct files_reflog_iterator { |
| struct ref_iterator base; |
| |
| struct ref_store *ref_store; |
| struct dir_iterator *dir_iterator; |
| struct object_id oid; |
| }; |
| |
| static int files_reflog_iterator_advance(struct ref_iterator *ref_iterator) |
| { |
| struct files_reflog_iterator *iter = |
| (struct files_reflog_iterator *)ref_iterator; |
| struct dir_iterator *diter = iter->dir_iterator; |
| int ok; |
| |
| while ((ok = dir_iterator_advance(diter)) == ITER_OK) { |
| int flags; |
| |
| if (!S_ISREG(diter->st.st_mode)) |
| continue; |
| if (diter->basename[0] == '.') |
| continue; |
| if (ends_with(diter->basename, ".lock")) |
| continue; |
| |
| if (refs_read_ref_full(iter->ref_store, |
| diter->relative_path, 0, |
| &iter->oid, &flags)) { |
| error("bad ref for %s", diter->path.buf); |
| continue; |
| } |
| |
| iter->base.refname = diter->relative_path; |
| iter->base.oid = &iter->oid; |
| iter->base.flags = flags; |
| return ITER_OK; |
| } |
| |
| iter->dir_iterator = NULL; |
| if (ref_iterator_abort(ref_iterator) == ITER_ERROR) |
| ok = ITER_ERROR; |
| return ok; |
| } |
| |
| static int files_reflog_iterator_peel(struct ref_iterator *ref_iterator, |
| struct object_id *peeled) |
| { |
| BUG("ref_iterator_peel() called for reflog_iterator"); |
| } |
| |
| static int files_reflog_iterator_abort(struct ref_iterator *ref_iterator) |
| { |
| struct files_reflog_iterator *iter = |
| (struct files_reflog_iterator *)ref_iterator; |
| int ok = ITER_DONE; |
| |
| if (iter->dir_iterator) |
| ok = dir_iterator_abort(iter->dir_iterator); |
| |
| base_ref_iterator_free(ref_iterator); |
| return ok; |
| } |
| |
| static struct ref_iterator_vtable files_reflog_iterator_vtable = { |
| files_reflog_iterator_advance, |
| files_reflog_iterator_peel, |
| files_reflog_iterator_abort |
| }; |
| |
| static struct ref_iterator *reflog_iterator_begin(struct ref_store *ref_store, |
| const char *gitdir) |
| { |
| struct files_reflog_iterator *iter = xcalloc(1, sizeof(*iter)); |
| struct ref_iterator *ref_iterator = &iter->base; |
| struct strbuf sb = STRBUF_INIT; |
| |
| base_ref_iterator_init(ref_iterator, &files_reflog_iterator_vtable, 0); |
| strbuf_addf(&sb, "%s/logs", gitdir); |
| iter->dir_iterator = dir_iterator_begin(sb.buf); |
| iter->ref_store = ref_store; |
| strbuf_release(&sb); |
| |
| return ref_iterator; |
| } |
| |
| static enum iterator_selection reflog_iterator_select( |
| struct ref_iterator *iter_worktree, |
| struct ref_iterator *iter_common, |
| void *cb_data) |
| { |
| if (iter_worktree) { |
| /* |
| * We're a bit loose here. We probably should ignore |
| * common refs if they are accidentally added as |
| * per-worktree refs. |
| */ |
| return ITER_SELECT_0; |
| } else if (iter_common) { |
| if (ref_type(iter_common->refname) == REF_TYPE_NORMAL) |
| return ITER_SELECT_1; |
| |
| /* |
| * The main ref store may contain main worktree's |
| * per-worktree refs, which should be ignored |
| */ |
| return ITER_SKIP_1; |
| } else |
| return ITER_DONE; |
| } |
| |
| static struct ref_iterator *files_reflog_iterator_begin(struct ref_store *ref_store) |
| { |
| struct files_ref_store *refs = |
| files_downcast(ref_store, REF_STORE_READ, |
| "reflog_iterator_begin"); |
| |
| if (!strcmp(refs->gitdir, refs->gitcommondir)) { |
| return reflog_iterator_begin(ref_store, refs->gitcommondir); |
| } else { |
| return merge_ref_iterator_begin( |
| 0, |
| reflog_iterator_begin(ref_store, refs->gitdir), |
| reflog_iterator_begin(ref_store, refs->gitcommondir), |
| reflog_iterator_select, refs); |
| } |
| } |
| |
| /* |
| * If update is a direct update of head_ref (the reference pointed to |
| * by HEAD), then add an extra REF_LOG_ONLY update for HEAD. |
| */ |
| static int split_head_update(struct ref_update *update, |
| struct ref_transaction *transaction, |
| const char *head_ref, |
| struct string_list *affected_refnames, |
| struct strbuf *err) |
| { |
| struct string_list_item *item; |
| struct ref_update *new_update; |
| |
| if ((update->flags & REF_LOG_ONLY) || |
| (update->flags & REF_IS_PRUNING) || |
| (update->flags & REF_UPDATE_VIA_HEAD)) |
| return 0; |
| |
| if (strcmp(update->refname, head_ref)) |
| return 0; |
| |
| /* |
| * First make sure that HEAD is not already in the |
| * transaction. This check is O(lg N) in the transaction |
| * size, but it happens at most once per transaction. |
| */ |
| if (string_list_has_string(affected_refnames, "HEAD")) { |
| /* An entry already existed */ |
| strbuf_addf(err, |
| "multiple updates for 'HEAD' (including one " |
| "via its referent '%s') are not allowed", |
| update->refname); |
| return TRANSACTION_NAME_CONFLICT; |
| } |
| |
| new_update = ref_transaction_add_update( |
| transaction, "HEAD", |
| update->flags | REF_LOG_ONLY | REF_NO_DEREF, |
| &update->new_oid, &update->old_oid, |
| update->msg); |
| |
| /* |
| * Add "HEAD". This insertion is O(N) in the transaction |
| * size, but it happens at most once per transaction. |
| * Add new_update->refname instead of a literal "HEAD". |
| */ |
| if (strcmp(new_update->refname, "HEAD")) |
| BUG("%s unexpectedly not 'HEAD'", new_update->refname); |
| item = string_list_insert(affected_refnames, new_update->refname); |
| item->util = new_update; |
| |
| return 0; |
| } |
| |
| /* |
| * update is for a symref that points at referent and doesn't have |
| * REF_NO_DEREF set. Split it into two updates: |
| * - The original update, but with REF_LOG_ONLY and REF_NO_DEREF set |
| * - A new, separate update for the referent reference |
| * Note that the new update will itself be subject to splitting when |
| * the iteration gets to it. |
| */ |
| static int split_symref_update(struct files_ref_store *refs, |
| struct ref_update *update, |
| const char *referent, |
| struct ref_transaction *transaction, |
| struct string_list *affected_refnames, |
| struct strbuf *err) |
| { |
| struct string_list_item *item; |
| struct ref_update *new_update; |
| unsigned int new_flags; |
| |
| /* |
| * First make sure that referent is not already in the |
| * transaction. This check is O(lg N) in the transaction |
| * size, but it happens at most once per symref in a |
| * transaction. |
| */ |
| if (string_list_has_string(affected_refnames, referent)) { |
| /* An entry already exists */ |
| strbuf_addf(err, |
| "multiple updates for '%s' (including one " |
| "via symref '%s') are not allowed", |
| referent, update->refname); |
| return TRANSACTION_NAME_CONFLICT; |
| } |
| |
| new_flags = update->flags; |
| if (!strcmp(update->refname, "HEAD")) { |
| /* |
| * Record that the new update came via HEAD, so that |
| * when we process it, split_head_update() doesn't try |
| * to add another reflog update for HEAD. Note that |
| * this bit will be propagated if the new_update |
| * itself needs to be split. |
| */ |
| new_flags |= REF_UPDATE_VIA_HEAD; |
| } |
| |
| new_update = ref_transaction_add_update( |
| transaction, referent, new_flags, |
| &update->new_oid, &update->old_oid, |
| update->msg); |
| |
| new_update->parent_update = update; |
| |
| /* |
| * Change the symbolic ref update to log only. Also, it |
| * doesn't need to check its old OID value, as that will be |
| * done when new_update is processed. |
| */ |
| update->flags |= REF_LOG_ONLY | REF_NO_DEREF; |
| update->flags &= ~REF_HAVE_OLD; |
| |
| /* |
| * Add the referent. This insertion is O(N) in the transaction |
| * size, but it happens at most once per symref in a |
| * transaction. Make sure to add new_update->refname, which will |
| * be valid as long as affected_refnames is in use, and NOT |
| * referent, which might soon be freed by our caller. |
| */ |
| item = string_list_insert(affected_refnames, new_update->refname); |
| if (item->util) |
| BUG("%s unexpectedly found in affected_refnames", |
| new_update->refname); |
| item->util = new_update; |
| |
| return 0; |
| } |
| |
| /* |
| * Return the refname under which update was originally requested. |
| */ |
| static const char *original_update_refname(struct ref_update *update) |
| { |
| while (update->parent_update) |
| update = update->parent_update; |
| |
| return update->refname; |
| } |
| |
| /* |
| * Check whether the REF_HAVE_OLD and old_oid values stored in update |
| * are consistent with oid, which is the reference's current value. If |
| * everything is OK, return 0; otherwise, write an error message to |
| * err and return -1. |
| */ |
| static int check_old_oid(struct ref_update *update, struct object_id *oid, |
| struct strbuf *err) |
| { |
| if (!(update->flags & REF_HAVE_OLD) || |
| oideq(oid, &update->old_oid)) |
| return 0; |
| |
| if (is_null_oid(&update->old_oid)) |
| strbuf_addf(err, "cannot lock ref '%s': " |
| "reference already exists", |
| original_update_refname(update)); |
| else if (is_null_oid(oid)) |
| strbuf_addf(err, "cannot lock ref '%s': " |
| "reference is missing but expected %s", |
| original_update_refname(update), |
| oid_to_hex(&update->old_oid)); |
| else |
| strbuf_addf(err, "cannot lock ref '%s': " |
| "is at %s but expected %s", |
| original_update_refname(update), |
| oid_to_hex(oid), |
| oid_to_hex(&update->old_oid)); |
| |
| return -1; |
| } |
| |
| /* |
| * Prepare for carrying out update: |
| * - Lock the reference referred to by update. |
| * - Read the reference under lock. |
| * - Check that its old OID value (if specified) is correct, and in |
| * any case record it in update->lock->old_oid for later use when |
| * writing the reflog. |
| * - If it is a symref update without REF_NO_DEREF, split it up into a |
| * REF_LOG_ONLY update of the symref and add a separate update for |
| * the referent to transaction. |
| * - If it is an update of head_ref, add a corresponding REF_LOG_ONLY |
| * update of HEAD. |
| */ |
| static int lock_ref_for_update(struct files_ref_store *refs, |
| struct ref_update *update, |
| struct ref_transaction *transaction, |
| const char *head_ref, |
| struct string_list *affected_refnames, |
| struct strbuf *err) |
| { |
| struct strbuf referent = STRBUF_INIT; |
| int mustexist = (update->flags & REF_HAVE_OLD) && |
| !is_null_oid(&update->old_oid); |
| int ret = 0; |
| struct ref_lock *lock; |
| |
| files_assert_main_repository(refs, "lock_ref_for_update"); |
| |
| if ((update->flags & REF_HAVE_NEW) && is_null_oid(&update->new_oid)) |
| update->flags |= REF_DELETING; |
| |
| if (head_ref) { |
| ret = split_head_update(update, transaction, head_ref, |
| affected_refnames, err); |
| if (ret) |
| goto out; |
| } |
| |
| ret = lock_raw_ref(refs, update->refname, mustexist, |
| affected_refnames, NULL, |
| &lock, &referent, |
| &update->type, err); |
| if (ret) { |
| char *reason; |
| |
| reason = strbuf_detach(err, NULL); |
| strbuf_addf(err, "cannot lock ref '%s': %s", |
| original_update_refname(update), reason); |
| free(reason); |
| goto out; |
| } |
| |
| update->backend_data = lock; |
| |
| if (update->type & REF_ISSYMREF) { |
| if (update->flags & REF_NO_DEREF) { |
| /* |
| * We won't be reading the referent as part of |
| * the transaction, so we have to read it here |
| * to record and possibly check old_oid: |
| */ |
| if (refs_read_ref_full(&refs->base, |
| referent.buf, 0, |
| &lock->old_oid, NULL)) { |
| if (update->flags & REF_HAVE_OLD) { |
| strbuf_addf(err, "cannot lock ref '%s': " |
| "error reading reference", |
| original_update_refname(update)); |
| ret = TRANSACTION_GENERIC_ERROR; |
| goto out; |
| } |
| } else if (check_old_oid(update, &lock->old_oid, err)) { |
| ret = TRANSACTION_GENERIC_ERROR; |
| goto out; |
| } |
| } else { |
| /* |
| * Create a new update for the reference this |
| * symref is pointing at. Also, we will record |
| * and verify old_oid for this update as part |
| * of processing the split-off update, so we |
| * don't have to do it here. |
| */ |
| ret = split_symref_update(refs, update, |
| referent.buf, transaction, |
| affected_refnames, err); |
| if (ret) |
| goto out; |
| } |
| } else { |
| struct ref_update *parent_update; |
| |
| if (check_old_oid(update, &lock->old_oid, err)) { |
| ret = TRANSACTION_GENERIC_ERROR; |
| goto out; |
| } |
| |
| /* |
| * If this update is happening indirectly because of a |
| * symref update, record the old OID in the parent |
| * update: |
| */ |
| for (parent_update = update->parent_update; |
| parent_update; |
| parent_update = parent_update->parent_update) { |
| struct ref_lock *parent_lock = parent_update->backend_data; |
| oidcpy(&parent_lock->old_oid, &lock->old_oid); |
| } |
| } |
| |
| if ((update->flags & REF_HAVE_NEW) && |
| !(update->flags & REF_DELETING) && |
| !(update->flags & REF_LOG_ONLY)) { |
| if (!(update->type & REF_ISSYMREF) && |
| oideq(&lock->old_oid, &update->new_oid)) { |
| /* |
| * The reference already has the desired |
| * value, so we don't need to write it. |
| */ |
| } else if (write_ref_to_lockfile(lock, &update->new_oid, |
| err)) { |
| char *write_err = strbuf_detach(err, NULL); |
| |
| /* |
| * The lock was freed upon failure of |
| * write_ref_to_lockfile(): |
| */ |
| update->backend_data = NULL; |
| strbuf_addf(err, |
| "cannot update ref '%s': %s", |
| update->refname, write_err); |
| free(write_err); |
| ret = TRANSACTION_GENERIC_ERROR; |
| goto out; |
| } else { |
| update->flags |= REF_NEEDS_COMMIT; |
| } |
| } |
| if (!(update->flags & REF_NEEDS_COMMIT)) { |
| /* |
| * We didn't call write_ref_to_lockfile(), so |
| * the lockfile is still open. Close it to |
| * free up the file descriptor: |
| */ |
| if (close_ref_gently(lock)) { |
| strbuf_addf(err, "couldn't close '%s.lock'", |
| update->refname); |
| ret = TRANSACTION_GENERIC_ERROR; |
| goto out; |
| } |
| } |
| |
| out: |
| strbuf_release(&referent); |
| return ret; |
| } |
| |
| struct files_transaction_backend_data { |
| struct ref_transaction *packed_transaction; |
| int packed_refs_locked; |
| }; |
| |
| /* |
| * Unlock any references in `transaction` that are still locked, and |
| * mark the transaction closed. |
| */ |
| static void files_transaction_cleanup(struct files_ref_store *refs, |
| struct ref_transaction *transaction) |
| { |
| size_t i; |
| struct files_transaction_backend_data *backend_data = |
| transaction->backend_data; |
| struct strbuf err = STRBUF_INIT; |
| |
| for (i = 0; i < transaction->nr; i++) { |
| struct ref_update *update = transaction->updates[i]; |
| struct ref_lock *lock = update->backend_data; |
| |
| if (lock) { |
| unlock_ref(lock); |
| update->backend_data = NULL; |
| } |
| } |
| |
| if (backend_data->packed_transaction && |
| ref_transaction_abort(backend_data->packed_transaction, &err)) { |
| error("error aborting transaction: %s", err.buf); |
| strbuf_release(&err); |
| } |
| |
| if (backend_data->packed_refs_locked) |
| packed_refs_unlock(refs->packed_ref_store); |
| |
| free(backend_data); |
| |
| transaction->state = REF_TRANSACTION_CLOSED; |
| } |
| |
| static int files_transaction_prepare(struct ref_store *ref_store, |
| struct ref_transaction *transaction, |
| struct strbuf *err) |
| { |
| struct files_ref_store *refs = |
| files_downcast(ref_store, REF_STORE_WRITE, |
| "ref_transaction_prepare"); |
| size_t i; |
| int ret = 0; |
| struct string_list affected_refnames = STRING_LIST_INIT_NODUP; |
| char *head_ref = NULL; |
| int head_type; |
| struct files_transaction_backend_data *backend_data; |
| struct ref_transaction *packed_transaction = NULL; |
| |
| assert(err); |
| |
| if (!transaction->nr) |
| goto cleanup; |
| |
| backend_data = xcalloc(1, sizeof(*backend_data)); |
| transaction->backend_data = backend_data; |
| |
| /* |
| * Fail if a refname appears more than once in the |
| * transaction. (If we end up splitting up any updates using |
| * split_symref_update() or split_head_update(), those |
| * functions will check that the new updates don't have the |
| * same refname as any existing ones.) Also fail if any of the |
| * updates use REF_IS_PRUNING without REF_NO_DEREF. |
| */ |
| for (i = 0; i < transaction->nr; i++) { |
| struct ref_update *update = transaction->updates[i]; |
| struct string_list_item *item = |
| string_list_append(&affected_refnames, update->refname); |
| |
| if ((update->flags & REF_IS_PRUNING) && |
| !(update->flags & REF_NO_DEREF)) |
| BUG("REF_IS_PRUNING set without REF_NO_DEREF"); |
| |
| /* |
| * We store a pointer to update in item->util, but at |
| * the moment we never use the value of this field |
| * except to check whether it is non-NULL. |
| */ |
| item->util = update; |
| } |
| string_list_sort(&affected_refnames); |
| if (ref_update_reject_duplicates(&affected_refnames, err)) { |
| ret = TRANSACTION_GENERIC_ERROR; |
| goto cleanup; |
| } |
| |
| /* |
| * Special hack: If a branch is updated directly and HEAD |
| * points to it (may happen on the remote side of a push |
| * for example) then logically the HEAD reflog should be |
| * updated too. |
| * |
| * A generic solution would require reverse symref lookups, |
| * but finding all symrefs pointing to a given branch would be |
| * rather costly for this rare event (the direct update of a |
| * branch) to be worth it. So let's cheat and check with HEAD |
| * only, which should cover 99% of all usage scenarios (even |
| * 100% of the default ones). |
| * |
| * So if HEAD is a symbolic reference, then record the name of |
| * the reference that it points to. If we see an update of |
| * head_ref within the transaction, then split_head_update() |
| * arranges for the reflog of HEAD to be updated, too. |
| */ |
| head_ref = refs_resolve_refdup(ref_store, "HEAD", |
| RESOLVE_REF_NO_RECURSE, |
| NULL, &head_type); |
| |
| if (head_ref && !(head_type & REF_ISSYMREF)) { |
| FREE_AND_NULL(head_ref); |
| } |
| |
| /* |
| * Acquire all locks, verify old values if provided, check |
| * that new values are valid, and write new values to the |
| * lockfiles, ready to be activated. Only keep one lockfile |
| * open at a time to avoid running out of file descriptors. |
| * Note that lock_ref_for_update() might append more updates |
| * to the transaction. |
| */ |
| for (i = 0; i < transaction->nr; i++) { |
| struct ref_update *update = transaction->updates[i]; |
| |
| ret = lock_ref_for_update(refs, update, transaction, |
| head_ref, &affected_refnames, err); |
| if (ret) |
| goto cleanup; |
| |
| if (update->flags & REF_DELETING && |
| !(update->flags & REF_LOG_ONLY) && |
| !(update->flags & REF_IS_PRUNING)) { |
| /* |
| * This reference has to be deleted from |
| * packed-refs if it exists there. |
| */ |
| if (!packed_transaction) { |
| packed_transaction = ref_store_transaction_begin( |
| refs->packed_ref_store, err); |
| if (!packed_transaction) { |
| ret = TRANSACTION_GENERIC_ERROR; |
| goto cleanup; |
| } |
| |
| backend_data->packed_transaction = |
| packed_transaction; |
| } |
| |
| ref_transaction_add_update( |
| packed_transaction, update->refname, |
| REF_HAVE_NEW | REF_NO_DEREF, |
| &update->new_oid, NULL, |
| NULL); |
| } |
| } |
| |
| if (packed_transaction) { |
| if (packed_refs_lock(refs->packed_ref_store, 0, err)) { |
| ret = TRANSACTION_GENERIC_ERROR; |
| goto cleanup; |
| } |
| backend_data->packed_refs_locked = 1; |
| |
| if (is_packed_transaction_needed(refs->packed_ref_store, |
| packed_transaction)) { |
| ret = ref_transaction_prepare(packed_transaction, err); |
| } else { |
| /* |
| * We can skip rewriting the `packed-refs` |
| * file. But we do need to leave it locked, so |
| * that somebody else doesn't pack a reference |
| * that we are trying to delete. |
| */ |
| if (ref_transaction_abort(packed_transaction, err)) { |
| ret = TRANSACTION_GENERIC_ERROR; |
| goto cleanup; |
| } |
| backend_data->packed_transaction = NULL; |
| } |
| } |
| |
| cleanup: |
| free(head_ref); |
| string_list_clear(&affected_refnames, 0); |
| |
| if (ret) |
| files_transaction_cleanup(refs, transaction); |
| else |
| transaction->state = REF_TRANSACTION_PREPARED; |
| |
| return ret; |
| } |
| |
| static int files_transaction_finish(struct ref_store *ref_store, |
| struct ref_transaction *transaction, |
| struct strbuf *err) |
| { |
| struct files_ref_store *refs = |
| files_downcast(ref_store, 0, "ref_transaction_finish"); |
| size_t i; |
| int ret = 0; |
| struct strbuf sb = STRBUF_INIT; |
| struct files_transaction_backend_data *backend_data; |
| struct ref_transaction *packed_transaction; |
| |
| |
| assert(err); |
| |
| if (!transaction->nr) { |
| transaction->state = REF_TRANSACTION_CLOSED; |
| return 0; |
| } |
| |
| backend_data = transaction->backend_data; |
| packed_transaction = backend_data->packed_transaction; |
| |
| /* Perform updates first so live commits remain referenced */ |
| for (i = 0; i < transaction->nr; i++) { |
| struct ref_update *update = transaction->updates[i]; |
| struct ref_lock *lock = update->backend_data; |
| |
| if (update->flags & REF_NEEDS_COMMIT || |
| update->flags & REF_LOG_ONLY) { |
| if (files_log_ref_write(refs, |
| lock->ref_name, |
| &lock->old_oid, |
| &update->new_oid, |
| update->msg, update->flags, |
| err)) { |
| char *old_msg = strbuf_detach(err, NULL); |
| |
| strbuf_addf(err, "cannot update the ref '%s': %s", |
| lock->ref_name, old_msg); |
| free(old_msg); |
| unlock_ref(lock); |
| update->backend_data = NULL; |
| ret = TRANSACTION_GENERIC_ERROR; |
| goto cleanup; |
| } |
| } |
| if (update->flags & REF_NEEDS_COMMIT) { |
| clear_loose_ref_cache(refs); |
| if (commit_ref(lock)) { |
| strbuf_addf(err, "couldn't set '%s'", lock->ref_name); |
| unlock_ref(lock); |
| update->backend_data = NULL; |
| ret = TRANSACTION_GENERIC_ERROR; |
| goto cleanup; |
| } |
| } |
| } |
| |
| /* |
| * Now that updates are safely completed, we can perform |
| * deletes. First delete the reflogs of any references that |
| * will be deleted, since (in the unexpected event of an |
| * error) leaving a reference without a reflog is less bad |
| * than leaving a reflog without a reference (the latter is a |
| * mildly invalid repository state): |
| */ |
| for (i = 0; i < transaction->nr; i++) { |
| struct ref_update *update = transaction->updates[i]; |
| if (update->flags & REF_DELETING && |
| !(update->flags & REF_LOG_ONLY) && |
| !(update->flags & REF_IS_PRUNING)) { |
| strbuf_reset(&sb); |
| files_reflog_path(refs, &sb, update->refname); |
| if (!unlink_or_warn(sb.buf)) |
| try_remove_empty_parents(refs, update->refname, |
| REMOVE_EMPTY_PARENTS_REFLOG); |
| } |
| } |
| |
| /* |
| * Perform deletes now that updates are safely completed. |
| * |
| * First delete any packed versions of the references, while |
| * retaining the packed-refs lock: |
| */ |
| if (packed_transaction) { |
| ret = ref_transaction_commit(packed_transaction, err); |
| ref_transaction_free(packed_transaction); |
| packed_transaction = NULL; |
| backend_data->packed_transaction = NULL; |
| if (ret) |
| goto cleanup; |
| } |
| |
| /* Now delete the loose versions of the references: */ |
| for (i = 0; i < transaction->nr; i++) { |
| struct ref_update *update = transaction->updates[i]; |
| struct ref_lock *lock = update->backend_data; |
| |
| if (update->flags & REF_DELETING && |
| !(update->flags & REF_LOG_ONLY)) { |
| if (!(update->type & REF_ISPACKED) || |
| update->type & REF_ISSYMREF) { |
| /* It is a loose reference. */ |
| strbuf_reset(&sb); |
| files_ref_path(refs, &sb, lock->ref_name); |
| if (unlink_or_msg(sb.buf, err)) { |
| ret = TRANSACTION_GENERIC_ERROR; |
| goto cleanup; |
| } |
| update->flags |= REF_DELETED_LOOSE; |
| } |
| } |
| } |
| |
| clear_loose_ref_cache(refs); |
| |
| cleanup: |
| files_transaction_cleanup(refs, transaction); |
| |
| for (i = 0; i < transaction->nr; i++) { |
| struct ref_update *update = transaction->updates[i]; |
| |
| if (update->flags & REF_DELETED_LOOSE) { |
| /* |
| * The loose reference was deleted. Delete any |
| * empty parent directories. (Note that this |
| * can only work because we have already |
| * removed the lockfile.) |
| */ |
| try_remove_empty_parents(refs, update->refname, |
| REMOVE_EMPTY_PARENTS_REF); |
| } |
| } |
| |
| strbuf_release(&sb); |
| return ret; |
| } |
| |
| static int files_transaction_abort(struct ref_store *ref_store, |
| struct ref_transaction *transaction, |
| struct strbuf *err) |
| { |
| struct files_ref_store *refs = |
| files_downcast(ref_store, 0, "ref_transaction_abort"); |
| |
| files_transaction_cleanup(refs, transaction); |
| return 0; |
| } |
| |
| static int ref_present(const char *refname, |
| const struct object_id *oid, int flags, void *cb_data) |
| { |
| struct string_list *affected_refnames = cb_data; |
| |
| return string_list_has_string(affected_refnames, refname); |
| } |
| |
| static int files_initial_transaction_commit(struct ref_store *ref_store, |
| struct ref_transaction *transaction, |
| struct strbuf *err) |
| { |
| struct files_ref_store *refs = |
| files_downcast(ref_store, REF_STORE_WRITE, |
| "initial_ref_transaction_commit"); |
| size_t i; |
| int ret = 0; |
| struct string_list affected_refnames = STRING_LIST_INIT_NODUP; |
| struct ref_transaction *packed_transaction = NULL; |
| |
| assert(err); |
| |
| if (transaction->state != REF_TRANSACTION_OPEN) |
| BUG("commit called for transaction that is not open"); |
| |
| /* Fail if a refname appears more than once in the transaction: */ |
| for (i = 0; i < transaction->nr; i++) |
| string_list_append(&affected_refnames, |
| transaction->updates[i]->refname); |
| string_list_sort(&affected_refnames); |
| if (ref_update_reject_duplicates(&affected_refnames, err)) { |
| ret = TRANSACTION_GENERIC_ERROR; |
| goto cleanup; |
| } |
| |
| /* |
| * It's really undefined to call this function in an active |
| * repository or when there are existing references: we are |
| * only locking and changing packed-refs, so (1) any |
| * simultaneous processes might try to change a reference at |
| * the same time we do, and (2) any existing loose versions of |
| * the references that we are setting would have precedence |
| * over our values. But some remote helpers create the remote |
| * "HEAD" and "master" branches before calling this function, |
| * so here we really only check that none of the references |
| * that we are creating already exists. |
| */ |
| if (refs_for_each_rawref(&refs->base, ref_present, |
| &affected_refnames)) |
| BUG("initial ref transaction called with existing refs"); |
| |
| packed_transaction = ref_store_transaction_begin(refs->packed_ref_store, err); |
| if (!packed_transaction) { |
| ret = TRANSACTION_GENERIC_ERROR; |
| goto cleanup; |
| } |
| |
| for (i = 0; i < transaction->nr; i++) { |
| struct ref_update *update = transaction->updates[i]; |
| |
| if ((update->flags & REF_HAVE_OLD) && |
| !is_null_oid(&update->old_oid)) |
| BUG("initial ref transaction with old_sha1 set"); |
| if (refs_verify_refname_available(&refs->base, update->refname, |
| &affected_refnames, NULL, |
| err)) { |
| ret = TRANSACTION_NAME_CONFLICT; |
| goto cleanup; |
| } |
| |
| /* |
| * Add a reference creation for this reference to the |
| * packed-refs transaction: |
| */ |
| ref_transaction_add_update(packed_transaction, update->refname, |
| update->flags & ~REF_HAVE_OLD, |
| &update->new_oid, &update->old_oid, |
| NULL); |
| } |
| |
| if (packed_refs_lock(refs->packed_ref_store, 0, err)) { |
| ret = TRANSACTION_GENERIC_ERROR; |
| goto cleanup; |
| } |
| |
| if (initial_ref_transaction_commit(packed_transaction, err)) { |
| ret = TRANSACTION_GENERIC_ERROR; |
| } |
| |
| packed_refs_unlock(refs->packed_ref_store); |
| cleanup: |
| if (packed_transaction) |
| ref_transaction_free(packed_transaction); |
| transaction->state = REF_TRANSACTION_CLOSED; |
| string_list_clear(&affected_refnames, 0); |
| return ret; |
| } |
| |
| struct expire_reflog_cb { |
| unsigned int flags; |
| reflog_expiry_should_prune_fn *should_prune_fn; |
| void *policy_cb; |
| FILE *newlog; |
| struct object_id last_kept_oid; |
| }; |
| |
| static int expire_reflog_ent(struct object_id *ooid, struct object_id *noid, |
| const char *email, timestamp_t timestamp, int tz, |
| const char *message, void *cb_data) |
| { |
| struct expire_reflog_cb *cb = cb_data; |
| struct expire_reflog_policy_cb *policy_cb = cb->policy_cb; |
| |
| if (cb->flags & EXPIRE_REFLOGS_REWRITE) |
| ooid = &cb->last_kept_oid; |
| |
| if ((*cb->should_prune_fn)(ooid, noid, email, timestamp, tz, |
| message, policy_cb)) { |
| if (!cb->newlog) |
| printf("would prune %s", message); |
| else if (cb->flags & EXPIRE_REFLOGS_VERBOSE) |
| printf("prune %s", message); |
| } else { |
| if (cb->newlog) { |
| fprintf(cb->newlog, "%s %s %s %"PRItime" %+05d\t%s", |
| oid_to_hex(ooid), oid_to_hex(noid), |
| email, timestamp, tz, message); |
| oidcpy(&cb->last_kept_oid, noid); |
| } |
| if (cb->flags & EXPIRE_REFLOGS_VERBOSE) |
| printf("keep %s", message); |
| } |
| return 0; |
| } |
| |
| static int files_reflog_expire(struct ref_store *ref_store, |
| const char *refname, const struct object_id *oid, |
| unsigned int flags, |
| reflog_expiry_prepare_fn prepare_fn, |
| reflog_expiry_should_prune_fn should_prune_fn, |
| reflog_expiry_cleanup_fn cleanup_fn, |
| void *policy_cb_data) |
| { |
| struct files_ref_store *refs = |
| files_downcast(ref_store, REF_STORE_WRITE, "reflog_expire"); |
| struct lock_file reflog_lock = LOCK_INIT; |
| struct expire_reflog_cb cb; |
| struct ref_lock *lock; |
| struct strbuf log_file_sb = STRBUF_INIT; |
| char *log_file; |
| int status = 0; |
| int type; |
| struct strbuf err = STRBUF_INIT; |
| |
| memset(&cb, 0, sizeof(cb)); |
| cb.flags = flags; |
| cb.policy_cb = policy_cb_data; |
| cb.should_prune_fn = should_prune_fn; |
| |
| /* |
| * The reflog file is locked by holding the lock on the |
| * reference itself, plus we might need to update the |
| * reference if --updateref was specified: |
| */ |
| lock = lock_ref_oid_basic(refs, refname, oid, |
| NULL, NULL, REF_NO_DEREF, |
| &type, &err); |
| if (!lock) { |
| error("cannot lock ref '%s': %s", refname, err.buf); |
| strbuf_release(&err); |
| return -1; |
| } |
| if (!refs_reflog_exists(ref_store, refname)) { |
| unlock_ref(lock); |
| return 0; |
| } |
| |
| files_reflog_path(refs, &log_file_sb, refname); |
| log_file = strbuf_detach(&log_file_sb, NULL); |
| if (!(flags & EXPIRE_REFLOGS_DRY_RUN)) { |
| /* |
| * Even though holding $GIT_DIR/logs/$reflog.lock has |
| * no locking implications, we use the lock_file |
| * machinery here anyway because it does a lot of the |
| * work we need, including cleaning up if the program |
| * exits unexpectedly. |
| */ |
| if (hold_lock_file_for_update(&reflog_lock, log_file, 0) < 0) { |
| struct strbuf err = STRBUF_INIT; |
| unable_to_lock_message(log_file, errno, &err); |
| error("%s", err.buf); |
| strbuf_release(&err); |
| goto failure; |
| } |
| cb.newlog = fdopen_lock_file(&reflog_lock, "w"); |
| if (!cb.newlog) { |
| error("cannot fdopen %s (%s)", |
| get_lock_file_path(&reflog_lock), strerror(errno)); |
| goto failure; |
| } |
| } |
| |
| (*prepare_fn)(refname, oid, cb.policy_cb); |
| refs_for_each_reflog_ent(ref_store, refname, expire_reflog_ent, &cb); |
| (*cleanup_fn)(cb.policy_cb); |
| |
| if (!(flags & EXPIRE_REFLOGS_DRY_RUN)) { |
| /* |
| * It doesn't make sense to adjust a reference pointed |
| * to by a symbolic ref based on expiring entries in |
| * the symbolic reference's reflog. Nor can we update |
| * a reference if there are no remaining reflog |
| * entries. |
| */ |
| int update = (flags & EXPIRE_REFLOGS_UPDATE_REF) && |
| !(type & REF_ISSYMREF) && |
| !is_null_oid(&cb.last_kept_oid); |
| |
| if (close_lock_file_gently(&reflog_lock)) { |
| status |= error("couldn't write %s: %s", log_file, |
| strerror(errno)); |
| rollback_lock_file(&reflog_lock); |
| } else if (update && |
| (write_in_full(get_lock_file_fd(&lock->lk), |
| oid_to_hex(&cb.last_kept_oid), the_hash_algo->hexsz) < 0 || |
| write_str_in_full(get_lock_file_fd(&lock->lk), "\n") < 0 || |
| close_ref_gently(lock) < 0)) { |
| status |= error("couldn't write %s", |
| get_lock_file_path(&lock->lk)); |
| rollback_lock_file(&reflog_lock); |
| } else if (commit_lock_file(&reflog_lock)) { |
| status |= error("unable to write reflog '%s' (%s)", |
| log_file, strerror(errno)); |
| } else if (update && commit_ref(lock)) { |
| status |= error("couldn't set %s", lock->ref_name); |
|