| /* |
| * GIT - The information manager from hell |
| * |
| * Copyright (C) Linus Torvalds, 2005 |
| */ |
| #define NO_THE_INDEX_COMPATIBILITY_MACROS |
| #include "cache.h" |
| #include "cache-tree.h" |
| #include "refs.h" |
| #include "dir.h" |
| #include "tree.h" |
| #include "commit.h" |
| #include "blob.h" |
| #include "resolve-undo.h" |
| |
| static struct cache_entry *refresh_cache_entry(struct cache_entry *ce, int really); |
| |
| /* Index extensions. |
| * |
| * The first letter should be 'A'..'Z' for extensions that are not |
| * necessary for a correct operation (i.e. optimization data). |
| * When new extensions are added that _needs_ to be understood in |
| * order to correctly interpret the index file, pick character that |
| * is outside the range, to cause the reader to abort. |
| */ |
| |
| #define CACHE_EXT(s) ( (s[0]<<24)|(s[1]<<16)|(s[2]<<8)|(s[3]) ) |
| #define CACHE_EXT_TREE 0x54524545 /* "TREE" */ |
| #define CACHE_EXT_RESOLVE_UNDO 0x52455543 /* "REUC" */ |
| |
| struct index_state the_index; |
| |
| static void set_index_entry(struct index_state *istate, int nr, struct cache_entry *ce) |
| { |
| istate->cache[nr] = ce; |
| add_name_hash(istate, ce); |
| } |
| |
| static void replace_index_entry(struct index_state *istate, int nr, struct cache_entry *ce) |
| { |
| struct cache_entry *old = istate->cache[nr]; |
| |
| remove_name_hash(old); |
| set_index_entry(istate, nr, ce); |
| istate->cache_changed = 1; |
| } |
| |
| void rename_index_entry_at(struct index_state *istate, int nr, const char *new_name) |
| { |
| struct cache_entry *old = istate->cache[nr], *new; |
| int namelen = strlen(new_name); |
| |
| new = xmalloc(cache_entry_size(namelen)); |
| copy_cache_entry(new, old); |
| new->ce_flags &= ~(CE_STATE_MASK | CE_NAMEMASK); |
| new->ce_flags |= (namelen >= CE_NAMEMASK ? CE_NAMEMASK : namelen); |
| memcpy(new->name, new_name, namelen + 1); |
| |
| cache_tree_invalidate_path(istate->cache_tree, old->name); |
| remove_index_entry_at(istate, nr); |
| add_index_entry(istate, new, ADD_CACHE_OK_TO_ADD|ADD_CACHE_OK_TO_REPLACE); |
| } |
| |
| /* |
| * This only updates the "non-critical" parts of the directory |
| * cache, ie the parts that aren't tracked by GIT, and only used |
| * to validate the cache. |
| */ |
| void fill_stat_cache_info(struct cache_entry *ce, struct stat *st) |
| { |
| ce->ce_ctime.sec = (unsigned int)st->st_ctime; |
| ce->ce_mtime.sec = (unsigned int)st->st_mtime; |
| ce->ce_ctime.nsec = ST_CTIME_NSEC(*st); |
| ce->ce_mtime.nsec = ST_MTIME_NSEC(*st); |
| ce->ce_dev = st->st_dev; |
| ce->ce_ino = st->st_ino; |
| ce->ce_uid = st->st_uid; |
| ce->ce_gid = st->st_gid; |
| ce->ce_size = st->st_size; |
| |
| if (assume_unchanged) |
| ce->ce_flags |= CE_VALID; |
| |
| if (S_ISREG(st->st_mode)) |
| ce_mark_uptodate(ce); |
| } |
| |
| static int ce_compare_data(struct cache_entry *ce, struct stat *st) |
| { |
| int match = -1; |
| int fd = open(ce->name, O_RDONLY); |
| |
| if (fd >= 0) { |
| unsigned char sha1[20]; |
| if (!index_fd(sha1, fd, st, OBJ_BLOB, ce->name, 0)) |
| match = hashcmp(sha1, ce->sha1); |
| /* index_fd() closed the file descriptor already */ |
| } |
| return match; |
| } |
| |
| static int ce_compare_link(struct cache_entry *ce, size_t expected_size) |
| { |
| int match = -1; |
| void *buffer; |
| unsigned long size; |
| enum object_type type; |
| struct strbuf sb = STRBUF_INIT; |
| |
| if (strbuf_readlink(&sb, ce->name, expected_size)) |
| return -1; |
| |
| buffer = read_sha1_file(ce->sha1, &type, &size); |
| if (buffer) { |
| if (size == sb.len) |
| match = memcmp(buffer, sb.buf, size); |
| free(buffer); |
| } |
| strbuf_release(&sb); |
| return match; |
| } |
| |
| static int ce_compare_gitlink(struct cache_entry *ce) |
| { |
| unsigned char sha1[20]; |
| |
| /* |
| * We don't actually require that the .git directory |
| * under GITLINK directory be a valid git directory. It |
| * might even be missing (in case nobody populated that |
| * sub-project). |
| * |
| * If so, we consider it always to match. |
| */ |
| if (resolve_gitlink_ref(ce->name, "HEAD", sha1) < 0) |
| return 0; |
| return hashcmp(sha1, ce->sha1); |
| } |
| |
| static int ce_modified_check_fs(struct cache_entry *ce, struct stat *st) |
| { |
| switch (st->st_mode & S_IFMT) { |
| case S_IFREG: |
| if (ce_compare_data(ce, st)) |
| return DATA_CHANGED; |
| break; |
| case S_IFLNK: |
| if (ce_compare_link(ce, xsize_t(st->st_size))) |
| return DATA_CHANGED; |
| break; |
| case S_IFDIR: |
| if (S_ISGITLINK(ce->ce_mode)) |
| return ce_compare_gitlink(ce) ? DATA_CHANGED : 0; |
| default: |
| return TYPE_CHANGED; |
| } |
| return 0; |
| } |
| |
| static int ce_match_stat_basic(struct cache_entry *ce, struct stat *st) |
| { |
| unsigned int changed = 0; |
| |
| if (ce->ce_flags & CE_REMOVE) |
| return MODE_CHANGED | DATA_CHANGED | TYPE_CHANGED; |
| |
| switch (ce->ce_mode & S_IFMT) { |
| case S_IFREG: |
| changed |= !S_ISREG(st->st_mode) ? TYPE_CHANGED : 0; |
| /* We consider only the owner x bit to be relevant for |
| * "mode changes" |
| */ |
| if (trust_executable_bit && |
| (0100 & (ce->ce_mode ^ st->st_mode))) |
| changed |= MODE_CHANGED; |
| break; |
| case S_IFLNK: |
| if (!S_ISLNK(st->st_mode) && |
| (has_symlinks || !S_ISREG(st->st_mode))) |
| changed |= TYPE_CHANGED; |
| break; |
| case S_IFGITLINK: |
| /* We ignore most of the st_xxx fields for gitlinks */ |
| if (!S_ISDIR(st->st_mode)) |
| changed |= TYPE_CHANGED; |
| else if (ce_compare_gitlink(ce)) |
| changed |= DATA_CHANGED; |
| return changed; |
| default: |
| die("internal error: ce_mode is %o", ce->ce_mode); |
| } |
| if (ce->ce_mtime.sec != (unsigned int)st->st_mtime) |
| changed |= MTIME_CHANGED; |
| if (trust_ctime && ce->ce_ctime.sec != (unsigned int)st->st_ctime) |
| changed |= CTIME_CHANGED; |
| |
| #ifdef USE_NSEC |
| if (ce->ce_mtime.nsec != ST_MTIME_NSEC(*st)) |
| changed |= MTIME_CHANGED; |
| if (trust_ctime && ce->ce_ctime.nsec != ST_CTIME_NSEC(*st)) |
| changed |= CTIME_CHANGED; |
| #endif |
| |
| if (ce->ce_uid != (unsigned int) st->st_uid || |
| ce->ce_gid != (unsigned int) st->st_gid) |
| changed |= OWNER_CHANGED; |
| if (ce->ce_ino != (unsigned int) st->st_ino) |
| changed |= INODE_CHANGED; |
| |
| #ifdef USE_STDEV |
| /* |
| * st_dev breaks on network filesystems where different |
| * clients will have different views of what "device" |
| * the filesystem is on |
| */ |
| if (ce->ce_dev != (unsigned int) st->st_dev) |
| changed |= INODE_CHANGED; |
| #endif |
| |
| if (ce->ce_size != (unsigned int) st->st_size) |
| changed |= DATA_CHANGED; |
| |
| /* Racily smudged entry? */ |
| if (!ce->ce_size) { |
| if (!is_empty_blob_sha1(ce->sha1)) |
| changed |= DATA_CHANGED; |
| } |
| |
| return changed; |
| } |
| |
| static int is_racy_timestamp(const struct index_state *istate, struct cache_entry *ce) |
| { |
| return (!S_ISGITLINK(ce->ce_mode) && |
| istate->timestamp.sec && |
| #ifdef USE_NSEC |
| /* nanosecond timestamped files can also be racy! */ |
| (istate->timestamp.sec < ce->ce_mtime.sec || |
| (istate->timestamp.sec == ce->ce_mtime.sec && |
| istate->timestamp.nsec <= ce->ce_mtime.nsec)) |
| #else |
| istate->timestamp.sec <= ce->ce_mtime.sec |
| #endif |
| ); |
| } |
| |
| int ie_match_stat(const struct index_state *istate, |
| struct cache_entry *ce, struct stat *st, |
| unsigned int options) |
| { |
| unsigned int changed; |
| int ignore_valid = options & CE_MATCH_IGNORE_VALID; |
| int ignore_skip_worktree = options & CE_MATCH_IGNORE_SKIP_WORKTREE; |
| int assume_racy_is_modified = options & CE_MATCH_RACY_IS_DIRTY; |
| |
| /* |
| * If it's marked as always valid in the index, it's |
| * valid whatever the checked-out copy says. |
| * |
| * skip-worktree has the same effect with higher precedence |
| */ |
| if (!ignore_skip_worktree && ce_skip_worktree(ce)) |
| return 0; |
| if (!ignore_valid && (ce->ce_flags & CE_VALID)) |
| return 0; |
| |
| /* |
| * Intent-to-add entries have not been added, so the index entry |
| * by definition never matches what is in the work tree until it |
| * actually gets added. |
| */ |
| if (ce->ce_flags & CE_INTENT_TO_ADD) |
| return DATA_CHANGED | TYPE_CHANGED | MODE_CHANGED; |
| |
| changed = ce_match_stat_basic(ce, st); |
| |
| /* |
| * Within 1 second of this sequence: |
| * echo xyzzy >file && git-update-index --add file |
| * running this command: |
| * echo frotz >file |
| * would give a falsely clean cache entry. The mtime and |
| * length match the cache, and other stat fields do not change. |
| * |
| * We could detect this at update-index time (the cache entry |
| * being registered/updated records the same time as "now") |
| * and delay the return from git-update-index, but that would |
| * effectively mean we can make at most one commit per second, |
| * which is not acceptable. Instead, we check cache entries |
| * whose mtime are the same as the index file timestamp more |
| * carefully than others. |
| */ |
| if (!changed && is_racy_timestamp(istate, ce)) { |
| if (assume_racy_is_modified) |
| changed |= DATA_CHANGED; |
| else |
| changed |= ce_modified_check_fs(ce, st); |
| } |
| |
| return changed; |
| } |
| |
| int ie_modified(const struct index_state *istate, |
| struct cache_entry *ce, struct stat *st, unsigned int options) |
| { |
| int changed, changed_fs; |
| |
| changed = ie_match_stat(istate, ce, st, options); |
| if (!changed) |
| return 0; |
| /* |
| * If the mode or type has changed, there's no point in trying |
| * to refresh the entry - it's not going to match |
| */ |
| if (changed & (MODE_CHANGED | TYPE_CHANGED)) |
| return changed; |
| |
| /* |
| * Immediately after read-tree or update-index --cacheinfo, |
| * the length field is zero, as we have never even read the |
| * lstat(2) information once, and we cannot trust DATA_CHANGED |
| * returned by ie_match_stat() which in turn was returned by |
| * ce_match_stat_basic() to signal that the filesize of the |
| * blob changed. We have to actually go to the filesystem to |
| * see if the contents match, and if so, should answer "unchanged". |
| * |
| * The logic does not apply to gitlinks, as ce_match_stat_basic() |
| * already has checked the actual HEAD from the filesystem in the |
| * subproject. If ie_match_stat() already said it is different, |
| * then we know it is. |
| */ |
| if ((changed & DATA_CHANGED) && |
| (S_ISGITLINK(ce->ce_mode) || ce->ce_size != 0)) |
| return changed; |
| |
| changed_fs = ce_modified_check_fs(ce, st); |
| if (changed_fs) |
| return changed | changed_fs; |
| return 0; |
| } |
| |
| int base_name_compare(const char *name1, int len1, int mode1, |
| const char *name2, int len2, int mode2) |
| { |
| unsigned char c1, c2; |
| int len = len1 < len2 ? len1 : len2; |
| int cmp; |
| |
| cmp = memcmp(name1, name2, len); |
| if (cmp) |
| return cmp; |
| c1 = name1[len]; |
| c2 = name2[len]; |
| if (!c1 && S_ISDIR(mode1)) |
| c1 = '/'; |
| if (!c2 && S_ISDIR(mode2)) |
| c2 = '/'; |
| return (c1 < c2) ? -1 : (c1 > c2) ? 1 : 0; |
| } |
| |
| /* |
| * df_name_compare() is identical to base_name_compare(), except it |
| * compares conflicting directory/file entries as equal. Note that |
| * while a directory name compares as equal to a regular file, they |
| * then individually compare _differently_ to a filename that has |
| * a dot after the basename (because '\0' < '.' < '/'). |
| * |
| * This is used by routines that want to traverse the git namespace |
| * but then handle conflicting entries together when possible. |
| */ |
| int df_name_compare(const char *name1, int len1, int mode1, |
| const char *name2, int len2, int mode2) |
| { |
| int len = len1 < len2 ? len1 : len2, cmp; |
| unsigned char c1, c2; |
| |
| cmp = memcmp(name1, name2, len); |
| if (cmp) |
| return cmp; |
| /* Directories and files compare equal (same length, same name) */ |
| if (len1 == len2) |
| return 0; |
| c1 = name1[len]; |
| if (!c1 && S_ISDIR(mode1)) |
| c1 = '/'; |
| c2 = name2[len]; |
| if (!c2 && S_ISDIR(mode2)) |
| c2 = '/'; |
| if (c1 == '/' && !c2) |
| return 0; |
| if (c2 == '/' && !c1) |
| return 0; |
| return c1 - c2; |
| } |
| |
| int cache_name_compare(const char *name1, int flags1, const char *name2, int flags2) |
| { |
| int len1 = flags1 & CE_NAMEMASK; |
| int len2 = flags2 & CE_NAMEMASK; |
| int len = len1 < len2 ? len1 : len2; |
| int cmp; |
| |
| cmp = memcmp(name1, name2, len); |
| if (cmp) |
| return cmp; |
| if (len1 < len2) |
| return -1; |
| if (len1 > len2) |
| return 1; |
| |
| /* Compare stages */ |
| flags1 &= CE_STAGEMASK; |
| flags2 &= CE_STAGEMASK; |
| |
| if (flags1 < flags2) |
| return -1; |
| if (flags1 > flags2) |
| return 1; |
| return 0; |
| } |
| |
| int index_name_pos(const struct index_state *istate, const char *name, int namelen) |
| { |
| int first, last; |
| |
| first = 0; |
| last = istate->cache_nr; |
| while (last > first) { |
| int next = (last + first) >> 1; |
| struct cache_entry *ce = istate->cache[next]; |
| int cmp = cache_name_compare(name, namelen, ce->name, ce->ce_flags); |
| if (!cmp) |
| return next; |
| if (cmp < 0) { |
| last = next; |
| continue; |
| } |
| first = next+1; |
| } |
| return -first-1; |
| } |
| |
| /* Remove entry, return true if there are more entries to go.. */ |
| int remove_index_entry_at(struct index_state *istate, int pos) |
| { |
| struct cache_entry *ce = istate->cache[pos]; |
| |
| record_resolve_undo(istate, ce); |
| remove_name_hash(ce); |
| istate->cache_changed = 1; |
| istate->cache_nr--; |
| if (pos >= istate->cache_nr) |
| return 0; |
| memmove(istate->cache + pos, |
| istate->cache + pos + 1, |
| (istate->cache_nr - pos) * sizeof(struct cache_entry *)); |
| return 1; |
| } |
| |
| /* |
| * Remove all cache ententries marked for removal, that is where |
| * CE_REMOVE is set in ce_flags. This is much more effective than |
| * calling remove_index_entry_at() for each entry to be removed. |
| */ |
| void remove_marked_cache_entries(struct index_state *istate) |
| { |
| struct cache_entry **ce_array = istate->cache; |
| unsigned int i, j; |
| |
| for (i = j = 0; i < istate->cache_nr; i++) { |
| if (ce_array[i]->ce_flags & CE_REMOVE) |
| remove_name_hash(ce_array[i]); |
| else |
| ce_array[j++] = ce_array[i]; |
| } |
| istate->cache_changed = 1; |
| istate->cache_nr = j; |
| } |
| |
| int remove_file_from_index(struct index_state *istate, const char *path) |
| { |
| int pos = index_name_pos(istate, path, strlen(path)); |
| if (pos < 0) |
| pos = -pos-1; |
| cache_tree_invalidate_path(istate->cache_tree, path); |
| while (pos < istate->cache_nr && !strcmp(istate->cache[pos]->name, path)) |
| remove_index_entry_at(istate, pos); |
| return 0; |
| } |
| |
| static int compare_name(struct cache_entry *ce, const char *path, int namelen) |
| { |
| return namelen != ce_namelen(ce) || memcmp(path, ce->name, namelen); |
| } |
| |
| static int index_name_pos_also_unmerged(struct index_state *istate, |
| const char *path, int namelen) |
| { |
| int pos = index_name_pos(istate, path, namelen); |
| struct cache_entry *ce; |
| |
| if (pos >= 0) |
| return pos; |
| |
| /* maybe unmerged? */ |
| pos = -1 - pos; |
| if (pos >= istate->cache_nr || |
| compare_name((ce = istate->cache[pos]), path, namelen)) |
| return -1; |
| |
| /* order of preference: stage 2, 1, 3 */ |
| if (ce_stage(ce) == 1 && pos + 1 < istate->cache_nr && |
| ce_stage((ce = istate->cache[pos + 1])) == 2 && |
| !compare_name(ce, path, namelen)) |
| pos++; |
| return pos; |
| } |
| |
| static int different_name(struct cache_entry *ce, struct cache_entry *alias) |
| { |
| int len = ce_namelen(ce); |
| return ce_namelen(alias) != len || memcmp(ce->name, alias->name, len); |
| } |
| |
| /* |
| * If we add a filename that aliases in the cache, we will use the |
| * name that we already have - but we don't want to update the same |
| * alias twice, because that implies that there were actually two |
| * different files with aliasing names! |
| * |
| * So we use the CE_ADDED flag to verify that the alias was an old |
| * one before we accept it as |
| */ |
| static struct cache_entry *create_alias_ce(struct cache_entry *ce, struct cache_entry *alias) |
| { |
| int len; |
| struct cache_entry *new; |
| |
| if (alias->ce_flags & CE_ADDED) |
| die("Will not add file alias '%s' ('%s' already exists in index)", ce->name, alias->name); |
| |
| /* Ok, create the new entry using the name of the existing alias */ |
| len = ce_namelen(alias); |
| new = xcalloc(1, cache_entry_size(len)); |
| memcpy(new->name, alias->name, len); |
| copy_cache_entry(new, ce); |
| free(ce); |
| return new; |
| } |
| |
| static void record_intent_to_add(struct cache_entry *ce) |
| { |
| unsigned char sha1[20]; |
| if (write_sha1_file("", 0, blob_type, sha1)) |
| die("cannot create an empty blob in the object database"); |
| hashcpy(ce->sha1, sha1); |
| } |
| |
| int add_to_index(struct index_state *istate, const char *path, struct stat *st, int flags) |
| { |
| int size, namelen, was_same; |
| mode_t st_mode = st->st_mode; |
| struct cache_entry *ce, *alias; |
| unsigned ce_option = CE_MATCH_IGNORE_VALID|CE_MATCH_IGNORE_SKIP_WORKTREE|CE_MATCH_RACY_IS_DIRTY; |
| int verbose = flags & (ADD_CACHE_VERBOSE | ADD_CACHE_PRETEND); |
| int pretend = flags & ADD_CACHE_PRETEND; |
| int intent_only = flags & ADD_CACHE_INTENT; |
| int add_option = (ADD_CACHE_OK_TO_ADD|ADD_CACHE_OK_TO_REPLACE| |
| (intent_only ? ADD_CACHE_NEW_ONLY : 0)); |
| |
| if (!S_ISREG(st_mode) && !S_ISLNK(st_mode) && !S_ISDIR(st_mode)) |
| return error("%s: can only add regular files, symbolic links or git-directories", path); |
| |
| namelen = strlen(path); |
| if (S_ISDIR(st_mode)) { |
| while (namelen && path[namelen-1] == '/') |
| namelen--; |
| } |
| size = cache_entry_size(namelen); |
| ce = xcalloc(1, size); |
| memcpy(ce->name, path, namelen); |
| ce->ce_flags = namelen; |
| if (!intent_only) |
| fill_stat_cache_info(ce, st); |
| else |
| ce->ce_flags |= CE_INTENT_TO_ADD; |
| |
| if (trust_executable_bit && has_symlinks) |
| ce->ce_mode = create_ce_mode(st_mode); |
| else { |
| /* If there is an existing entry, pick the mode bits and type |
| * from it, otherwise assume unexecutable regular file. |
| */ |
| struct cache_entry *ent; |
| int pos = index_name_pos_also_unmerged(istate, path, namelen); |
| |
| ent = (0 <= pos) ? istate->cache[pos] : NULL; |
| ce->ce_mode = ce_mode_from_stat(ent, st_mode); |
| } |
| |
| /* When core.ignorecase=true, determine if a directory of the same name but differing |
| * case already exists within the Git repository. If it does, ensure the directory |
| * case of the file being added to the repository matches (is folded into) the existing |
| * entry's directory case. |
| */ |
| if (ignore_case) { |
| const char *startPtr = ce->name; |
| const char *ptr = startPtr; |
| while (*ptr) { |
| while (*ptr && *ptr != '/') |
| ++ptr; |
| if (*ptr == '/') { |
| struct cache_entry *foundce; |
| ++ptr; |
| foundce = index_name_exists(&the_index, ce->name, ptr - ce->name, ignore_case); |
| if (foundce) { |
| memcpy((void *)startPtr, foundce->name + (startPtr - ce->name), ptr - startPtr); |
| startPtr = ptr; |
| } |
| } |
| } |
| } |
| |
| alias = index_name_exists(istate, ce->name, ce_namelen(ce), ignore_case); |
| if (alias && !ce_stage(alias) && !ie_match_stat(istate, alias, st, ce_option)) { |
| /* Nothing changed, really */ |
| free(ce); |
| if (!S_ISGITLINK(alias->ce_mode)) |
| ce_mark_uptodate(alias); |
| alias->ce_flags |= CE_ADDED; |
| return 0; |
| } |
| if (!intent_only) { |
| if (index_path(ce->sha1, path, st, HASH_WRITE_OBJECT)) |
| return error("unable to index file %s", path); |
| } else |
| record_intent_to_add(ce); |
| |
| if (ignore_case && alias && different_name(ce, alias)) |
| ce = create_alias_ce(ce, alias); |
| ce->ce_flags |= CE_ADDED; |
| |
| /* It was suspected to be racily clean, but it turns out to be Ok */ |
| was_same = (alias && |
| !ce_stage(alias) && |
| !hashcmp(alias->sha1, ce->sha1) && |
| ce->ce_mode == alias->ce_mode); |
| |
| if (pretend) |
| ; |
| else if (add_index_entry(istate, ce, add_option)) |
| return error("unable to add %s to index",path); |
| if (verbose && !was_same) |
| printf("add '%s'\n", path); |
| return 0; |
| } |
| |
| int add_file_to_index(struct index_state *istate, const char *path, int flags) |
| { |
| struct stat st; |
| if (lstat(path, &st)) |
| die_errno("unable to stat '%s'", path); |
| return add_to_index(istate, path, &st, flags); |
| } |
| |
| struct cache_entry *make_cache_entry(unsigned int mode, |
| const unsigned char *sha1, const char *path, int stage, |
| int refresh) |
| { |
| int size, len; |
| struct cache_entry *ce; |
| |
| if (!verify_path(path)) { |
| error("Invalid path '%s'", path); |
| return NULL; |
| } |
| |
| len = strlen(path); |
| size = cache_entry_size(len); |
| ce = xcalloc(1, size); |
| |
| hashcpy(ce->sha1, sha1); |
| memcpy(ce->name, path, len); |
| ce->ce_flags = create_ce_flags(len, stage); |
| ce->ce_mode = create_ce_mode(mode); |
| |
| if (refresh) |
| return refresh_cache_entry(ce, 0); |
| |
| return ce; |
| } |
| |
| int ce_same_name(struct cache_entry *a, struct cache_entry *b) |
| { |
| int len = ce_namelen(a); |
| return ce_namelen(b) == len && !memcmp(a->name, b->name, len); |
| } |
| |
| int ce_path_match(const struct cache_entry *ce, const struct pathspec *pathspec) |
| { |
| return match_pathspec_depth(pathspec, ce->name, ce_namelen(ce), 0, NULL); |
| } |
| |
| /* |
| * We fundamentally don't like some paths: we don't want |
| * dot or dot-dot anywhere, and for obvious reasons don't |
| * want to recurse into ".git" either. |
| * |
| * Also, we don't want double slashes or slashes at the |
| * end that can make pathnames ambiguous. |
| */ |
| static int verify_dotfile(const char *rest) |
| { |
| /* |
| * The first character was '.', but that |
| * has already been discarded, we now test |
| * the rest. |
| */ |
| |
| /* "." is not allowed */ |
| if (*rest == '\0' || is_dir_sep(*rest)) |
| return 0; |
| |
| switch (*rest) { |
| /* |
| * ".git" followed by NUL or slash is bad. This |
| * shares the path end test with the ".." case. |
| */ |
| case 'g': |
| if (rest[1] != 'i') |
| break; |
| if (rest[2] != 't') |
| break; |
| rest += 2; |
| /* fallthrough */ |
| case '.': |
| if (rest[1] == '\0' || is_dir_sep(rest[1])) |
| return 0; |
| } |
| return 1; |
| } |
| |
| int verify_path(const char *path) |
| { |
| char c; |
| |
| if (has_dos_drive_prefix(path)) |
| return 0; |
| |
| goto inside; |
| for (;;) { |
| if (!c) |
| return 1; |
| if (is_dir_sep(c)) { |
| inside: |
| c = *path++; |
| if ((c == '.' && !verify_dotfile(path)) || |
| is_dir_sep(c) || c == '\0') |
| return 0; |
| } |
| c = *path++; |
| } |
| } |
| |
| /* |
| * Do we have another file that has the beginning components being a |
| * proper superset of the name we're trying to add? |
| */ |
| static int has_file_name(struct index_state *istate, |
| const struct cache_entry *ce, int pos, int ok_to_replace) |
| { |
| int retval = 0; |
| int len = ce_namelen(ce); |
| int stage = ce_stage(ce); |
| const char *name = ce->name; |
| |
| while (pos < istate->cache_nr) { |
| struct cache_entry *p = istate->cache[pos++]; |
| |
| if (len >= ce_namelen(p)) |
| break; |
| if (memcmp(name, p->name, len)) |
| break; |
| if (ce_stage(p) != stage) |
| continue; |
| if (p->name[len] != '/') |
| continue; |
| if (p->ce_flags & CE_REMOVE) |
| continue; |
| retval = -1; |
| if (!ok_to_replace) |
| break; |
| remove_index_entry_at(istate, --pos); |
| } |
| return retval; |
| } |
| |
| /* |
| * Do we have another file with a pathname that is a proper |
| * subset of the name we're trying to add? |
| */ |
| static int has_dir_name(struct index_state *istate, |
| const struct cache_entry *ce, int pos, int ok_to_replace) |
| { |
| int retval = 0; |
| int stage = ce_stage(ce); |
| const char *name = ce->name; |
| const char *slash = name + ce_namelen(ce); |
| |
| for (;;) { |
| int len; |
| |
| for (;;) { |
| if (*--slash == '/') |
| break; |
| if (slash <= ce->name) |
| return retval; |
| } |
| len = slash - name; |
| |
| pos = index_name_pos(istate, name, create_ce_flags(len, stage)); |
| if (pos >= 0) { |
| /* |
| * Found one, but not so fast. This could |
| * be a marker that says "I was here, but |
| * I am being removed". Such an entry is |
| * not a part of the resulting tree, and |
| * it is Ok to have a directory at the same |
| * path. |
| */ |
| if (!(istate->cache[pos]->ce_flags & CE_REMOVE)) { |
| retval = -1; |
| if (!ok_to_replace) |
| break; |
| remove_index_entry_at(istate, pos); |
| continue; |
| } |
| } |
| else |
| pos = -pos-1; |
| |
| /* |
| * Trivial optimization: if we find an entry that |
| * already matches the sub-directory, then we know |
| * we're ok, and we can exit. |
| */ |
| while (pos < istate->cache_nr) { |
| struct cache_entry *p = istate->cache[pos]; |
| if ((ce_namelen(p) <= len) || |
| (p->name[len] != '/') || |
| memcmp(p->name, name, len)) |
| break; /* not our subdirectory */ |
| if (ce_stage(p) == stage && !(p->ce_flags & CE_REMOVE)) |
| /* |
| * p is at the same stage as our entry, and |
| * is a subdirectory of what we are looking |
| * at, so we cannot have conflicts at our |
| * level or anything shorter. |
| */ |
| return retval; |
| pos++; |
| } |
| } |
| return retval; |
| } |
| |
| /* We may be in a situation where we already have path/file and path |
| * is being added, or we already have path and path/file is being |
| * added. Either one would result in a nonsense tree that has path |
| * twice when git-write-tree tries to write it out. Prevent it. |
| * |
| * If ok-to-replace is specified, we remove the conflicting entries |
| * from the cache so the caller should recompute the insert position. |
| * When this happens, we return non-zero. |
| */ |
| static int check_file_directory_conflict(struct index_state *istate, |
| const struct cache_entry *ce, |
| int pos, int ok_to_replace) |
| { |
| int retval; |
| |
| /* |
| * When ce is an "I am going away" entry, we allow it to be added |
| */ |
| if (ce->ce_flags & CE_REMOVE) |
| return 0; |
| |
| /* |
| * We check if the path is a sub-path of a subsequent pathname |
| * first, since removing those will not change the position |
| * in the array. |
| */ |
| retval = has_file_name(istate, ce, pos, ok_to_replace); |
| |
| /* |
| * Then check if the path might have a clashing sub-directory |
| * before it. |
| */ |
| return retval + has_dir_name(istate, ce, pos, ok_to_replace); |
| } |
| |
| static int add_index_entry_with_check(struct index_state *istate, struct cache_entry *ce, int option) |
| { |
| int pos; |
| int ok_to_add = option & ADD_CACHE_OK_TO_ADD; |
| int ok_to_replace = option & ADD_CACHE_OK_TO_REPLACE; |
| int skip_df_check = option & ADD_CACHE_SKIP_DFCHECK; |
| int new_only = option & ADD_CACHE_NEW_ONLY; |
| |
| cache_tree_invalidate_path(istate->cache_tree, ce->name); |
| pos = index_name_pos(istate, ce->name, ce->ce_flags); |
| |
| /* existing match? Just replace it. */ |
| if (pos >= 0) { |
| if (!new_only) |
| replace_index_entry(istate, pos, ce); |
| return 0; |
| } |
| pos = -pos-1; |
| |
| /* |
| * Inserting a merged entry ("stage 0") into the index |
| * will always replace all non-merged entries.. |
| */ |
| if (pos < istate->cache_nr && ce_stage(ce) == 0) { |
| while (ce_same_name(istate->cache[pos], ce)) { |
| ok_to_add = 1; |
| if (!remove_index_entry_at(istate, pos)) |
| break; |
| } |
| } |
| |
| if (!ok_to_add) |
| return -1; |
| if (!verify_path(ce->name)) |
| return error("Invalid path '%s'", ce->name); |
| |
| if (!skip_df_check && |
| check_file_directory_conflict(istate, ce, pos, ok_to_replace)) { |
| if (!ok_to_replace) |
| return error("'%s' appears as both a file and as a directory", |
| ce->name); |
| pos = index_name_pos(istate, ce->name, ce->ce_flags); |
| pos = -pos-1; |
| } |
| return pos + 1; |
| } |
| |
| int add_index_entry(struct index_state *istate, struct cache_entry *ce, int option) |
| { |
| int pos; |
| |
| if (option & ADD_CACHE_JUST_APPEND) |
| pos = istate->cache_nr; |
| else { |
| int ret; |
| ret = add_index_entry_with_check(istate, ce, option); |
| if (ret <= 0) |
| return ret; |
| pos = ret - 1; |
| } |
| |
| /* Make sure the array is big enough .. */ |
| if (istate->cache_nr == istate->cache_alloc) { |
| istate->cache_alloc = alloc_nr(istate->cache_alloc); |
| istate->cache = xrealloc(istate->cache, |
| istate->cache_alloc * sizeof(struct cache_entry *)); |
| } |
| |
| /* Add it in.. */ |
| istate->cache_nr++; |
| if (istate->cache_nr > pos + 1) |
| memmove(istate->cache + pos + 1, |
| istate->cache + pos, |
| (istate->cache_nr - pos - 1) * sizeof(ce)); |
| set_index_entry(istate, pos, ce); |
| istate->cache_changed = 1; |
| return 0; |
| } |
| |
| /* |
| * "refresh" does not calculate a new sha1 file or bring the |
| * cache up-to-date for mode/content changes. But what it |
| * _does_ do is to "re-match" the stat information of a file |
| * with the cache, so that you can refresh the cache for a |
| * file that hasn't been changed but where the stat entry is |
| * out of date. |
| * |
| * For example, you'd want to do this after doing a "git-read-tree", |
| * to link up the stat cache details with the proper files. |
| */ |
| static struct cache_entry *refresh_cache_ent(struct index_state *istate, |
| struct cache_entry *ce, |
| unsigned int options, int *err, |
| int *changed_ret) |
| { |
| struct stat st; |
| struct cache_entry *updated; |
| int changed, size; |
| int ignore_valid = options & CE_MATCH_IGNORE_VALID; |
| int ignore_skip_worktree = options & CE_MATCH_IGNORE_SKIP_WORKTREE; |
| |
| if (ce_uptodate(ce)) |
| return ce; |
| |
| /* |
| * CE_VALID or CE_SKIP_WORKTREE means the user promised us |
| * that the change to the work tree does not matter and told |
| * us not to worry. |
| */ |
| if (!ignore_skip_worktree && ce_skip_worktree(ce)) { |
| ce_mark_uptodate(ce); |
| return ce; |
| } |
| if (!ignore_valid && (ce->ce_flags & CE_VALID)) { |
| ce_mark_uptodate(ce); |
| return ce; |
| } |
| |
| if (lstat(ce->name, &st) < 0) { |
| if (err) |
| *err = errno; |
| return NULL; |
| } |
| |
| changed = ie_match_stat(istate, ce, &st, options); |
| if (changed_ret) |
| *changed_ret = changed; |
| if (!changed) { |
| /* |
| * The path is unchanged. If we were told to ignore |
| * valid bit, then we did the actual stat check and |
| * found that the entry is unmodified. If the entry |
| * is not marked VALID, this is the place to mark it |
| * valid again, under "assume unchanged" mode. |
| */ |
| if (ignore_valid && assume_unchanged && |
| !(ce->ce_flags & CE_VALID)) |
| ; /* mark this one VALID again */ |
| else { |
| /* |
| * We do not mark the index itself "modified" |
| * because CE_UPTODATE flag is in-core only; |
| * we are not going to write this change out. |
| */ |
| if (!S_ISGITLINK(ce->ce_mode)) |
| ce_mark_uptodate(ce); |
| return ce; |
| } |
| } |
| |
| if (ie_modified(istate, ce, &st, options)) { |
| if (err) |
| *err = EINVAL; |
| return NULL; |
| } |
| |
| size = ce_size(ce); |
| updated = xmalloc(size); |
| memcpy(updated, ce, size); |
| fill_stat_cache_info(updated, &st); |
| /* |
| * If ignore_valid is not set, we should leave CE_VALID bit |
| * alone. Otherwise, paths marked with --no-assume-unchanged |
| * (i.e. things to be edited) will reacquire CE_VALID bit |
| * automatically, which is not really what we want. |
| */ |
| if (!ignore_valid && assume_unchanged && |
| !(ce->ce_flags & CE_VALID)) |
| updated->ce_flags &= ~CE_VALID; |
| |
| return updated; |
| } |
| |
| static void show_file(const char * fmt, const char * name, int in_porcelain, |
| int * first, const char *header_msg) |
| { |
| if (in_porcelain && *first && header_msg) { |
| printf("%s\n", header_msg); |
| *first = 0; |
| } |
| printf(fmt, name); |
| } |
| |
| int refresh_index(struct index_state *istate, unsigned int flags, const char **pathspec, |
| char *seen, const char *header_msg) |
| { |
| int i; |
| int has_errors = 0; |
| int really = (flags & REFRESH_REALLY) != 0; |
| int allow_unmerged = (flags & REFRESH_UNMERGED) != 0; |
| int quiet = (flags & REFRESH_QUIET) != 0; |
| int not_new = (flags & REFRESH_IGNORE_MISSING) != 0; |
| int ignore_submodules = (flags & REFRESH_IGNORE_SUBMODULES) != 0; |
| int first = 1; |
| int in_porcelain = (flags & REFRESH_IN_PORCELAIN); |
| unsigned int options = really ? CE_MATCH_IGNORE_VALID : 0; |
| const char *modified_fmt; |
| const char *deleted_fmt; |
| const char *typechange_fmt; |
| const char *added_fmt; |
| const char *unmerged_fmt; |
| |
| modified_fmt = (in_porcelain ? "M\t%s\n" : "%s: needs update\n"); |
| deleted_fmt = (in_porcelain ? "D\t%s\n" : "%s: needs update\n"); |
| typechange_fmt = (in_porcelain ? "T\t%s\n" : "%s needs update\n"); |
| added_fmt = (in_porcelain ? "A\t%s\n" : "%s needs update\n"); |
| unmerged_fmt = (in_porcelain ? "U\t%s\n" : "%s: needs merge\n"); |
| for (i = 0; i < istate->cache_nr; i++) { |
| struct cache_entry *ce, *new; |
| int cache_errno = 0; |
| int changed = 0; |
| int filtered = 0; |
| |
| ce = istate->cache[i]; |
| if (ignore_submodules && S_ISGITLINK(ce->ce_mode)) |
| continue; |
| |
| if (pathspec && |
| !match_pathspec(pathspec, ce->name, strlen(ce->name), 0, seen)) |
| filtered = 1; |
| |
| if (ce_stage(ce)) { |
| while ((i < istate->cache_nr) && |
| ! strcmp(istate->cache[i]->name, ce->name)) |
| i++; |
| i--; |
| if (allow_unmerged) |
| continue; |
| if (!filtered) |
| show_file(unmerged_fmt, ce->name, in_porcelain, |
| &first, header_msg); |
| has_errors = 1; |
| continue; |
| } |
| |
| if (filtered) |
| continue; |
| |
| new = refresh_cache_ent(istate, ce, options, &cache_errno, &changed); |
| if (new == ce) |
| continue; |
| if (!new) { |
| const char *fmt; |
| |
| if (not_new && cache_errno == ENOENT) |
| continue; |
| if (really && cache_errno == EINVAL) { |
| /* If we are doing --really-refresh that |
| * means the index is not valid anymore. |
| */ |
| ce->ce_flags &= ~CE_VALID; |
| istate->cache_changed = 1; |
| } |
| if (quiet) |
| continue; |
| |
| if (cache_errno == ENOENT) |
| fmt = deleted_fmt; |
| else if (ce->ce_flags & CE_INTENT_TO_ADD) |
| fmt = added_fmt; /* must be before other checks */ |
| else if (changed & TYPE_CHANGED) |
| fmt = typechange_fmt; |
| else |
| fmt = modified_fmt; |
| show_file(fmt, |
| ce->name, in_porcelain, &first, header_msg); |
| has_errors = 1; |
| continue; |
| } |
| |
| replace_index_entry(istate, i, new); |
| } |
| return has_errors; |
| } |
| |
| static struct cache_entry *refresh_cache_entry(struct cache_entry *ce, int really) |
| { |
| return refresh_cache_ent(&the_index, ce, really, NULL, NULL); |
| } |
| |
| static int verify_hdr(struct cache_header *hdr, unsigned long size) |
| { |
| git_SHA_CTX c; |
| unsigned char sha1[20]; |
| |
| if (hdr->hdr_signature != htonl(CACHE_SIGNATURE)) |
| return error("bad signature"); |
| if (hdr->hdr_version != htonl(2) && hdr->hdr_version != htonl(3)) |
| return error("bad index version"); |
| git_SHA1_Init(&c); |
| git_SHA1_Update(&c, hdr, size - 20); |
| git_SHA1_Final(sha1, &c); |
| if (hashcmp(sha1, (unsigned char *)hdr + size - 20)) |
| return error("bad index file sha1 signature"); |
| return 0; |
| } |
| |
| static int read_index_extension(struct index_state *istate, |
| const char *ext, void *data, unsigned long sz) |
| { |
| switch (CACHE_EXT(ext)) { |
| case CACHE_EXT_TREE: |
| istate->cache_tree = cache_tree_read(data, sz); |
| break; |
| case CACHE_EXT_RESOLVE_UNDO: |
| istate->resolve_undo = resolve_undo_read(data, sz); |
| break; |
| default: |
| if (*ext < 'A' || 'Z' < *ext) |
| return error("index uses %.4s extension, which we do not understand", |
| ext); |
| fprintf(stderr, "ignoring %.4s extension\n", ext); |
| break; |
| } |
| return 0; |
| } |
| |
| int read_index(struct index_state *istate) |
| { |
| return read_index_from(istate, get_index_file()); |
| } |
| |
| static struct cache_entry *create_from_disk(struct ondisk_cache_entry *ondisk) |
| { |
| struct cache_entry *ce; |
| size_t len; |
| const char *name; |
| unsigned int flags; |
| |
| /* On-disk flags are just 16 bits */ |
| flags = ntohs(ondisk->flags); |
| len = flags & CE_NAMEMASK; |
| |
| if (flags & CE_EXTENDED) { |
| struct ondisk_cache_entry_extended *ondisk2; |
| int extended_flags; |
| ondisk2 = (struct ondisk_cache_entry_extended *)ondisk; |
| extended_flags = ntohs(ondisk2->flags2) << 16; |
| /* We do not yet understand any bit out of CE_EXTENDED_FLAGS */ |
| if (extended_flags & ~CE_EXTENDED_FLAGS) |
| die("Unknown index entry format %08x", extended_flags); |
| flags |= extended_flags; |
| name = ondisk2->name; |
| } |
| else |
| name = ondisk->name; |
| |
| if (len == CE_NAMEMASK) |
| len = strlen(name); |
| |
| ce = xmalloc(cache_entry_size(len)); |
| |
| ce->ce_ctime.sec = ntohl(ondisk->ctime.sec); |
| ce->ce_mtime.sec = ntohl(ondisk->mtime.sec); |
| ce->ce_ctime.nsec = ntohl(ondisk->ctime.nsec); |
| ce->ce_mtime.nsec = ntohl(ondisk->mtime.nsec); |
| ce->ce_dev = ntohl(ondisk->dev); |
| ce->ce_ino = ntohl(ondisk->ino); |
| ce->ce_mode = ntohl(ondisk->mode); |
| ce->ce_uid = ntohl(ondisk->uid); |
| ce->ce_gid = ntohl(ondisk->gid); |
| ce->ce_size = ntohl(ondisk->size); |
| ce->ce_flags = flags; |
| |
| hashcpy(ce->sha1, ondisk->sha1); |
| |
| memcpy(ce->name, name, len); |
| ce->name[len] = '\0'; |
| return ce; |
| } |
| |
| /* remember to discard_cache() before reading a different cache! */ |
| int read_index_from(struct index_state *istate, const char *path) |
| { |
| int fd, i; |
| struct stat st; |
| unsigned long src_offset; |
| struct cache_header *hdr; |
| void *mmap; |
| size_t mmap_size; |
| |
| errno = EBUSY; |
| if (istate->initialized) |
| return istate->cache_nr; |
| |
| errno = ENOENT; |
| istate->timestamp.sec = 0; |
| istate->timestamp.nsec = 0; |
| fd = open(path, O_RDONLY); |
| if (fd < 0) { |
| if (errno == ENOENT) |
| return 0; |
| die_errno("index file open failed"); |
| } |
| |
| if (fstat(fd, &st)) |
| die_errno("cannot stat the open index"); |
| |
| errno = EINVAL; |
| mmap_size = xsize_t(st.st_size); |
| if (mmap_size < sizeof(struct cache_header) + 20) |
| die("index file smaller than expected"); |
| |
| mmap = xmmap(NULL, mmap_size, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0); |
| close(fd); |
| if (mmap == MAP_FAILED) |
| die_errno("unable to map index file"); |
| |
| hdr = mmap; |
| if (verify_hdr(hdr, mmap_size) < 0) |
| goto unmap; |
| |
| istate->cache_nr = ntohl(hdr->hdr_entries); |
| istate->cache_alloc = alloc_nr(istate->cache_nr); |
| istate->cache = xcalloc(istate->cache_alloc, sizeof(struct cache_entry *)); |
| istate->initialized = 1; |
| |
| src_offset = sizeof(*hdr); |
| for (i = 0; i < istate->cache_nr; i++) { |
| struct ondisk_cache_entry *disk_ce; |
| struct cache_entry *ce; |
| |
| disk_ce = (struct ondisk_cache_entry *)((char *)mmap + src_offset); |
| ce = create_from_disk(disk_ce); |
| set_index_entry(istate, i, ce); |
| |
| src_offset += ondisk_ce_size(ce); |
| } |
| istate->timestamp.sec = st.st_mtime; |
| istate->timestamp.nsec = ST_MTIME_NSEC(st); |
| |
| while (src_offset <= mmap_size - 20 - 8) { |
| /* After an array of active_nr index entries, |
| * there can be arbitrary number of extended |
| * sections, each of which is prefixed with |
| * extension name (4-byte) and section length |
| * in 4-byte network byte order. |
| */ |
| uint32_t extsize; |
| memcpy(&extsize, (char *)mmap + src_offset + 4, 4); |
| extsize = ntohl(extsize); |
| if (read_index_extension(istate, |
| (const char *) mmap + src_offset, |
| (char *) mmap + src_offset + 8, |
| extsize) < 0) |
| goto unmap; |
| src_offset += 8; |
| src_offset += extsize; |
| } |
| munmap(mmap, mmap_size); |
| return istate->cache_nr; |
| |
| unmap: |
| munmap(mmap, mmap_size); |
| errno = EINVAL; |
| die("index file corrupt"); |
| } |
| |
| int is_index_unborn(struct index_state *istate) |
| { |
| return (!istate->cache_nr && !istate->timestamp.sec); |
| } |
| |
| int discard_index(struct index_state *istate) |
| { |
| int i; |
| |
| for (i = 0; i < istate->cache_nr; i++) |
| free(istate->cache[i]); |
| resolve_undo_clear_index(istate); |
| istate->cache_nr = 0; |
| istate->cache_changed = 0; |
| istate->timestamp.sec = 0; |
| istate->timestamp.nsec = 0; |
| istate->name_hash_initialized = 0; |
| free_hash(&istate->name_hash); |
| cache_tree_free(&(istate->cache_tree)); |
| istate->initialized = 0; |
| |
| /* no need to throw away allocated active_cache */ |
| return 0; |
| } |
| |
| int unmerged_index(const struct index_state *istate) |
| { |
| int i; |
| for (i = 0; i < istate->cache_nr; i++) { |
| if (ce_stage(istate->cache[i])) |
| return 1; |
| } |
| return 0; |
| } |
| |
| #define WRITE_BUFFER_SIZE 8192 |
| static unsigned char write_buffer[WRITE_BUFFER_SIZE]; |
| static unsigned long write_buffer_len; |
| |
| static int ce_write_flush(git_SHA_CTX *context, int fd) |
| { |
| unsigned int buffered = write_buffer_len; |
| if (buffered) { |
| git_SHA1_Update(context, write_buffer, buffered); |
| if (write_in_full(fd, write_buffer, buffered) != buffered) |
| return -1; |
| write_buffer_len = 0; |
| } |
| return 0; |
| } |
| |
| static int ce_write(git_SHA_CTX *context, int fd, void *data, unsigned int len) |
| { |
| while (len) { |
| unsigned int buffered = write_buffer_len; |
| unsigned int partial = WRITE_BUFFER_SIZE - buffered; |
| if (partial > len) |
| partial = len; |
| memcpy(write_buffer + buffered, data, partial); |
| buffered += partial; |
| if (buffered == WRITE_BUFFER_SIZE) { |
| write_buffer_len = buffered; |
| if (ce_write_flush(context, fd)) |
| return -1; |
| buffered = 0; |
| } |
| write_buffer_len = buffered; |
| len -= partial; |
| data = (char *) data + partial; |
| } |
| return 0; |
| } |
| |
| static int write_index_ext_header(git_SHA_CTX *context, int fd, |
| unsigned int ext, unsigned int sz) |
| { |
| ext = htonl(ext); |
| sz = htonl(sz); |
| return ((ce_write(context, fd, &ext, 4) < 0) || |
| (ce_write(context, fd, &sz, 4) < 0)) ? -1 : 0; |
| } |
| |
| static int ce_flush(git_SHA_CTX *context, int fd) |
| { |
| unsigned int left = write_buffer_len; |
| |
| if (left) { |
| write_buffer_len = 0; |
| git_SHA1_Update(context, write_buffer, left); |
| } |
| |
| /* Flush first if not enough space for SHA1 signature */ |
| if (left + 20 > WRITE_BUFFER_SIZE) { |
| if (write_in_full(fd, write_buffer, left) != left) |
| return -1; |
| left = 0; |
| } |
| |
| /* Append the SHA1 signature at the end */ |
| git_SHA1_Final(write_buffer + left, context); |
| left += 20; |
| return (write_in_full(fd, write_buffer, left) != left) ? -1 : 0; |
| } |
| |
| static void ce_smudge_racily_clean_entry(struct cache_entry *ce) |
| { |
| /* |
| * The only thing we care about in this function is to smudge the |
| * falsely clean entry due to touch-update-touch race, so we leave |
| * everything else as they are. We are called for entries whose |
| * ce_mtime match the index file mtime. |
| * |
| * Note that this actually does not do much for gitlinks, for |
| * which ce_match_stat_basic() always goes to the actual |
| * contents. The caller checks with is_racy_timestamp() which |
| * always says "no" for gitlinks, so we are not called for them ;-) |
| */ |
| struct stat st; |
| |
| if (lstat(ce->name, &st) < 0) |
| return; |
| if (ce_match_stat_basic(ce, &st)) |
| return; |
| if (ce_modified_check_fs(ce, &st)) { |
| /* This is "racily clean"; smudge it. Note that this |
| * is a tricky code. At first glance, it may appear |
| * that it can break with this sequence: |
| * |
| * $ echo xyzzy >frotz |
| * $ git-update-index --add frotz |
| * $ : >frotz |
| * $ sleep 3 |
| * $ echo filfre >nitfol |
| * $ git-update-index --add nitfol |
| * |
| * but it does not. When the second update-index runs, |
| * it notices that the entry "frotz" has the same timestamp |
| * as index, and if we were to smudge it by resetting its |
| * size to zero here, then the object name recorded |
| * in index is the 6-byte file but the cached stat information |
| * becomes zero --- which would then match what we would |
| * obtain from the filesystem next time we stat("frotz"). |
| * |
| * However, the second update-index, before calling |
| * this function, notices that the cached size is 6 |
| * bytes and what is on the filesystem is an empty |
| * file, and never calls us, so the cached size information |
| * for "frotz" stays 6 which does not match the filesystem. |
| */ |
| ce->ce_size = 0; |
| } |
| } |
| |
| static int ce_write_entry(git_SHA_CTX *c, int fd, struct cache_entry *ce) |
| { |
| int size = ondisk_ce_size(ce); |
| struct ondisk_cache_entry *ondisk = xcalloc(1, size); |
| char *name; |
| int result; |
| |
| ondisk->ctime.sec = htonl(ce->ce_ctime.sec); |
| ondisk->mtime.sec = htonl(ce->ce_mtime.sec); |
| ondisk->ctime.nsec = htonl(ce->ce_ctime.nsec); |
| ondisk->mtime.nsec = htonl(ce->ce_mtime.nsec); |
| ondisk->dev = htonl(ce->ce_dev); |
| ondisk->ino = htonl(ce->ce_ino); |
| ondisk->mode = htonl(ce->ce_mode); |
| ondisk->uid = htonl(ce->ce_uid); |
| ondisk->gid = htonl(ce->ce_gid); |
| ondisk->size = htonl(ce->ce_size); |
| hashcpy(ondisk->sha1, ce->sha1); |
| ondisk->flags = htons(ce->ce_flags); |
| if (ce->ce_flags & CE_EXTENDED) { |
| struct ondisk_cache_entry_extended *ondisk2; |
| ondisk2 = (struct ondisk_cache_entry_extended *)ondisk; |
| ondisk2->flags2 = htons((ce->ce_flags & CE_EXTENDED_FLAGS) >> 16); |
| name = ondisk2->name; |
| } |
| else |
| name = ondisk->name; |
| memcpy(name, ce->name, ce_namelen(ce)); |
| |
| result = ce_write(c, fd, ondisk, size); |
| free(ondisk); |
| return result; |
| } |
| |
| static int has_racy_timestamp(struct index_state *istate) |
| { |
| int entries = istate->cache_nr; |
| int i; |
| |
| for (i = 0; i < entries; i++) { |
| struct cache_entry *ce = istate->cache[i]; |
| if (is_racy_timestamp(istate, ce)) |
| return 1; |
| } |
| return 0; |
| } |
| |
| /* |
| * Opportunisticly update the index but do not complain if we can't |
| */ |
| void update_index_if_able(struct index_state *istate, struct lock_file *lockfile) |
| { |
| if ((istate->cache_changed || has_racy_timestamp(istate)) && |
| !write_index(istate, lockfile->fd)) |
| commit_locked_index(lockfile); |
| else |
| rollback_lock_file(lockfile); |
| } |
| |
| int write_index(struct index_state *istate, int newfd) |
| { |
| git_SHA_CTX c; |
| struct cache_header hdr; |
| int i, err, removed, extended; |
| struct cache_entry **cache = istate->cache; |
| int entries = istate->cache_nr; |
| struct stat st; |
| |
| for (i = removed = extended = 0; i < entries; i++) { |
| if (cache[i]->ce_flags & CE_REMOVE) |
| removed++; |
| |
| /* reduce extended entries if possible */ |
| cache[i]->ce_flags &= ~CE_EXTENDED; |
| if (cache[i]->ce_flags & CE_EXTENDED_FLAGS) { |
| extended++; |
| cache[i]->ce_flags |= CE_EXTENDED; |
| } |
| } |
| |
| hdr.hdr_signature = htonl(CACHE_SIGNATURE); |
| /* for extended format, increase version so older git won't try to read it */ |
| hdr.hdr_version = htonl(extended ? 3 : 2); |
| hdr.hdr_entries = htonl(entries - removed); |
| |
| git_SHA1_Init(&c); |
| if (ce_write(&c, newfd, &hdr, sizeof(hdr)) < 0) |
| return -1; |
| |
| for (i = 0; i < entries; i++) { |
| struct cache_entry *ce = cache[i]; |
| if (ce->ce_flags & CE_REMOVE) |
| continue; |
| if (!ce_uptodate(ce) && is_racy_timestamp(istate, ce)) |
| ce_smudge_racily_clean_entry(ce); |
| if (ce_write_entry(&c, newfd, ce) < 0) |
| return -1; |
| } |
| |
| /* Write extension data here */ |
| if (istate->cache_tree) { |
| struct strbuf sb = STRBUF_INIT; |
| |
| cache_tree_write(&sb, istate->cache_tree); |
| err = write_index_ext_header(&c, newfd, CACHE_EXT_TREE, sb.len) < 0 |
| || ce_write(&c, newfd, sb.buf, sb.len) < 0; |
| strbuf_release(&sb); |
| if (err) |
| return -1; |
| } |
| if (istate->resolve_undo) { |
| struct strbuf sb = STRBUF_INIT; |
| |
| resolve_undo_write(&sb, istate->resolve_undo); |
| err = write_index_ext_header(&c, newfd, CACHE_EXT_RESOLVE_UNDO, |
| sb.len) < 0 |
| || ce_write(&c, newfd, sb.buf, sb.len) < 0; |
| strbuf_release(&sb); |
| if (err) |
| return -1; |
| } |
| |
| if (ce_flush(&c, newfd) || fstat(newfd, &st)) |
| return -1; |
| istate->timestamp.sec = (unsigned int)st.st_mtime; |
| istate->timestamp.nsec = ST_MTIME_NSEC(st); |
| return 0; |
| } |
| |
| /* |
| * Read the index file that is potentially unmerged into given |
| * index_state, dropping any unmerged entries. Returns true if |
| * the index is unmerged. Callers who want to refuse to work |
| * from an unmerged state can call this and check its return value, |
| * instead of calling read_cache(). |
| */ |
| int read_index_unmerged(struct index_state *istate) |
| { |
| int i; |
| int unmerged = 0; |
| |
| read_index(istate); |
| for (i = 0; i < istate->cache_nr; i++) { |
| struct cache_entry *ce = istate->cache[i]; |
| struct cache_entry *new_ce; |
| int size, len; |
| |
| if (!ce_stage(ce)) |
| continue; |
| unmerged = 1; |
| len = strlen(ce->name); |
| size = cache_entry_size(len); |
| new_ce = xcalloc(1, size); |
| memcpy(new_ce->name, ce->name, len); |
| new_ce->ce_flags = create_ce_flags(len, 0) | CE_CONFLICTED; |
| new_ce->ce_mode = ce->ce_mode; |
| if (add_index_entry(istate, new_ce, 0)) |
| return error("%s: cannot drop to stage #0", |
| ce->name); |
| i = index_name_pos(istate, new_ce->name, len); |
| } |
| return unmerged; |
| } |
| |
| /* |
| * Returns 1 if the path is an "other" path with respect to |
| * the index; that is, the path is not mentioned in the index at all, |
| * either as a file, a directory with some files in the index, |
| * or as an unmerged entry. |
| * |
| * We helpfully remove a trailing "/" from directories so that |
| * the output of read_directory can be used as-is. |
| */ |
| int index_name_is_other(const struct index_state *istate, const char *name, |
| int namelen) |
| { |
| int pos; |
| if (namelen && name[namelen - 1] == '/') |
| namelen--; |
| pos = index_name_pos(istate, name, namelen); |
| if (0 <= pos) |
| return 0; /* exact match */ |
| pos = -pos - 1; |
| if (pos < istate->cache_nr) { |
| struct cache_entry *ce = istate->cache[pos]; |
| if (ce_namelen(ce) == namelen && |
| !memcmp(ce->name, name, namelen)) |
| return 0; /* Yup, this one exists unmerged */ |
| } |
| return 1; |
| } |