| #include "cache.h" |
| #include "tree-walk.h" |
| #include "dir.h" |
| #include "object-store.h" |
| #include "tree.h" |
| #include "pathspec.h" |
| |
| static const char *get_mode(const char *str, unsigned int *modep) |
| { |
| unsigned char c; |
| unsigned int mode = 0; |
| |
| if (*str == ' ') |
| return NULL; |
| |
| while ((c = *str++) != ' ') { |
| if (c < '0' || c > '7') |
| return NULL; |
| mode = (mode << 3) + (c - '0'); |
| } |
| *modep = mode; |
| return str; |
| } |
| |
| static int decode_tree_entry(struct tree_desc *desc, const char *buf, unsigned long size, struct strbuf *err) |
| { |
| const char *path; |
| unsigned int mode, len; |
| const unsigned hashsz = the_hash_algo->rawsz; |
| |
| if (size < hashsz + 3 || buf[size - (hashsz + 1)]) { |
| strbuf_addstr(err, _("too-short tree object")); |
| return -1; |
| } |
| |
| path = get_mode(buf, &mode); |
| if (!path) { |
| strbuf_addstr(err, _("malformed mode in tree entry")); |
| return -1; |
| } |
| if (!*path) { |
| strbuf_addstr(err, _("empty filename in tree entry")); |
| return -1; |
| } |
| len = strlen(path) + 1; |
| |
| /* Initialize the descriptor entry */ |
| desc->entry.path = path; |
| desc->entry.mode = canon_mode(mode); |
| desc->entry.pathlen = len - 1; |
| hashcpy(desc->entry.oid.hash, (const unsigned char *)path + len); |
| |
| return 0; |
| } |
| |
| static int init_tree_desc_internal(struct tree_desc *desc, const void *buffer, unsigned long size, struct strbuf *err) |
| { |
| desc->buffer = buffer; |
| desc->size = size; |
| if (size) |
| return decode_tree_entry(desc, buffer, size, err); |
| return 0; |
| } |
| |
| void init_tree_desc(struct tree_desc *desc, const void *buffer, unsigned long size) |
| { |
| struct strbuf err = STRBUF_INIT; |
| if (init_tree_desc_internal(desc, buffer, size, &err)) |
| die("%s", err.buf); |
| strbuf_release(&err); |
| } |
| |
| int init_tree_desc_gently(struct tree_desc *desc, const void *buffer, unsigned long size) |
| { |
| struct strbuf err = STRBUF_INIT; |
| int result = init_tree_desc_internal(desc, buffer, size, &err); |
| if (result) |
| error("%s", err.buf); |
| strbuf_release(&err); |
| return result; |
| } |
| |
| void *fill_tree_descriptor(struct repository *r, |
| struct tree_desc *desc, |
| const struct object_id *oid) |
| { |
| unsigned long size = 0; |
| void *buf = NULL; |
| |
| if (oid) { |
| buf = read_object_with_reference(r, oid, tree_type, &size, NULL); |
| if (!buf) |
| die("unable to read tree %s", oid_to_hex(oid)); |
| } |
| init_tree_desc(desc, buf, size); |
| return buf; |
| } |
| |
| static void entry_clear(struct name_entry *a) |
| { |
| memset(a, 0, sizeof(*a)); |
| } |
| |
| static void entry_extract(struct tree_desc *t, struct name_entry *a) |
| { |
| *a = t->entry; |
| } |
| |
| static int update_tree_entry_internal(struct tree_desc *desc, struct strbuf *err) |
| { |
| const void *buf = desc->buffer; |
| const unsigned char *end = (const unsigned char *)desc->entry.path + desc->entry.pathlen + 1 + the_hash_algo->rawsz; |
| unsigned long size = desc->size; |
| unsigned long len = end - (const unsigned char *)buf; |
| |
| if (size < len) |
| die(_("too-short tree file")); |
| buf = end; |
| size -= len; |
| desc->buffer = buf; |
| desc->size = size; |
| if (size) |
| return decode_tree_entry(desc, buf, size, err); |
| return 0; |
| } |
| |
| void update_tree_entry(struct tree_desc *desc) |
| { |
| struct strbuf err = STRBUF_INIT; |
| if (update_tree_entry_internal(desc, &err)) |
| die("%s", err.buf); |
| strbuf_release(&err); |
| } |
| |
| int update_tree_entry_gently(struct tree_desc *desc) |
| { |
| struct strbuf err = STRBUF_INIT; |
| if (update_tree_entry_internal(desc, &err)) { |
| error("%s", err.buf); |
| strbuf_release(&err); |
| /* Stop processing this tree after error */ |
| desc->size = 0; |
| return -1; |
| } |
| strbuf_release(&err); |
| return 0; |
| } |
| |
| int tree_entry(struct tree_desc *desc, struct name_entry *entry) |
| { |
| if (!desc->size) |
| return 0; |
| |
| *entry = desc->entry; |
| update_tree_entry(desc); |
| return 1; |
| } |
| |
| int tree_entry_gently(struct tree_desc *desc, struct name_entry *entry) |
| { |
| if (!desc->size) |
| return 0; |
| |
| *entry = desc->entry; |
| if (update_tree_entry_gently(desc)) |
| return 0; |
| return 1; |
| } |
| |
| void setup_traverse_info(struct traverse_info *info, const char *base) |
| { |
| size_t pathlen = strlen(base); |
| static struct traverse_info dummy; |
| |
| memset(info, 0, sizeof(*info)); |
| if (pathlen && base[pathlen-1] == '/') |
| pathlen--; |
| info->pathlen = pathlen ? pathlen + 1 : 0; |
| info->name = base; |
| info->namelen = pathlen; |
| if (pathlen) |
| info->prev = &dummy; |
| } |
| |
| char *make_traverse_path(char *path, size_t pathlen, |
| const struct traverse_info *info, |
| const char *name, size_t namelen) |
| { |
| /* Always points to the end of the name we're about to add */ |
| size_t pos = st_add(info->pathlen, namelen); |
| |
| if (pos >= pathlen) |
| BUG("too small buffer passed to make_traverse_path"); |
| |
| path[pos] = 0; |
| for (;;) { |
| if (pos < namelen) |
| BUG("traverse_info pathlen does not match strings"); |
| pos -= namelen; |
| memcpy(path + pos, name, namelen); |
| |
| if (!pos) |
| break; |
| path[--pos] = '/'; |
| |
| if (!info) |
| BUG("traverse_info ran out of list items"); |
| name = info->name; |
| namelen = info->namelen; |
| info = info->prev; |
| } |
| return path; |
| } |
| |
| void strbuf_make_traverse_path(struct strbuf *out, |
| const struct traverse_info *info, |
| const char *name, size_t namelen) |
| { |
| size_t len = traverse_path_len(info, namelen); |
| |
| strbuf_grow(out, len); |
| make_traverse_path(out->buf + out->len, out->alloc - out->len, |
| info, name, namelen); |
| strbuf_setlen(out, out->len + len); |
| } |
| |
| struct tree_desc_skip { |
| struct tree_desc_skip *prev; |
| const void *ptr; |
| }; |
| |
| struct tree_desc_x { |
| struct tree_desc d; |
| struct tree_desc_skip *skip; |
| }; |
| |
| static int check_entry_match(const char *a, int a_len, const char *b, int b_len) |
| { |
| /* |
| * The caller wants to pick *a* from a tree or nothing. |
| * We are looking at *b* in a tree. |
| * |
| * (0) If a and b are the same name, we are trivially happy. |
| * |
| * There are three possibilities where *a* could be hiding |
| * behind *b*. |
| * |
| * (1) *a* == "t", *b* == "ab" i.e. *b* sorts earlier than *a* no |
| * matter what. |
| * (2) *a* == "t", *b* == "t-2" and "t" is a subtree in the tree; |
| * (3) *a* == "t-2", *b* == "t" and "t-2" is a blob in the tree. |
| * |
| * Otherwise we know *a* won't appear in the tree without |
| * scanning further. |
| */ |
| |
| int cmp = name_compare(a, a_len, b, b_len); |
| |
| /* Most common case first -- reading sync'd trees */ |
| if (!cmp) |
| return cmp; |
| |
| if (0 < cmp) { |
| /* a comes after b; it does not matter if it is case (3) |
| if (b_len < a_len && !memcmp(a, b, b_len) && a[b_len] < '/') |
| return 1; |
| */ |
| return 1; /* keep looking */ |
| } |
| |
| /* b comes after a; are we looking at case (2)? */ |
| if (a_len < b_len && !memcmp(a, b, a_len) && b[a_len] < '/') |
| return 1; /* keep looking */ |
| |
| return -1; /* a cannot appear in the tree */ |
| } |
| |
| /* |
| * From the extended tree_desc, extract the first name entry, while |
| * paying attention to the candidate "first" name. Most importantly, |
| * when looking for an entry, if there are entries that sorts earlier |
| * in the tree object representation than that name, skip them and |
| * process the named entry first. We will remember that we haven't |
| * processed the first entry yet, and in the later call skip the |
| * entry we processed early when update_extended_entry() is called. |
| * |
| * E.g. if the underlying tree object has these entries: |
| * |
| * blob "t-1" |
| * blob "t-2" |
| * tree "t" |
| * blob "t=1" |
| * |
| * and the "first" asks for "t", remember that we still need to |
| * process "t-1" and "t-2" but extract "t". After processing the |
| * entry "t" from this call, the caller will let us know by calling |
| * update_extended_entry() that we can remember "t" has been processed |
| * already. |
| */ |
| |
| static void extended_entry_extract(struct tree_desc_x *t, |
| struct name_entry *a, |
| const char *first, |
| int first_len) |
| { |
| const char *path; |
| int len; |
| struct tree_desc probe; |
| struct tree_desc_skip *skip; |
| |
| /* |
| * Extract the first entry from the tree_desc, but skip the |
| * ones that we already returned in earlier rounds. |
| */ |
| while (1) { |
| if (!t->d.size) { |
| entry_clear(a); |
| break; /* not found */ |
| } |
| entry_extract(&t->d, a); |
| for (skip = t->skip; skip; skip = skip->prev) |
| if (a->path == skip->ptr) |
| break; /* found */ |
| if (!skip) |
| break; |
| /* We have processed this entry already. */ |
| update_tree_entry(&t->d); |
| } |
| |
| if (!first || !a->path) |
| return; |
| |
| /* |
| * The caller wants "first" from this tree, or nothing. |
| */ |
| path = a->path; |
| len = tree_entry_len(a); |
| switch (check_entry_match(first, first_len, path, len)) { |
| case -1: |
| entry_clear(a); |
| case 0: |
| return; |
| default: |
| break; |
| } |
| |
| /* |
| * We need to look-ahead -- we suspect that a subtree whose |
| * name is "first" may be hiding behind the current entry "path". |
| */ |
| probe = t->d; |
| while (probe.size) { |
| entry_extract(&probe, a); |
| path = a->path; |
| len = tree_entry_len(a); |
| switch (check_entry_match(first, first_len, path, len)) { |
| case -1: |
| entry_clear(a); |
| case 0: |
| return; |
| default: |
| update_tree_entry(&probe); |
| break; |
| } |
| /* keep looking */ |
| } |
| entry_clear(a); |
| } |
| |
| static void update_extended_entry(struct tree_desc_x *t, struct name_entry *a) |
| { |
| if (t->d.entry.path == a->path) { |
| update_tree_entry(&t->d); |
| } else { |
| /* we have returned this entry early */ |
| struct tree_desc_skip *skip = xmalloc(sizeof(*skip)); |
| skip->ptr = a->path; |
| skip->prev = t->skip; |
| t->skip = skip; |
| } |
| } |
| |
| static void free_extended_entry(struct tree_desc_x *t) |
| { |
| struct tree_desc_skip *p, *s; |
| |
| for (s = t->skip; s; s = p) { |
| p = s->prev; |
| free(s); |
| } |
| } |
| |
| static inline int prune_traversal(struct index_state *istate, |
| struct name_entry *e, |
| struct traverse_info *info, |
| struct strbuf *base, |
| int still_interesting) |
| { |
| if (!info->pathspec || still_interesting == 2) |
| return 2; |
| if (still_interesting < 0) |
| return still_interesting; |
| return tree_entry_interesting(istate, e, base, |
| 0, info->pathspec); |
| } |
| |
| int traverse_trees(struct index_state *istate, |
| int n, struct tree_desc *t, |
| struct traverse_info *info) |
| { |
| int error = 0; |
| struct name_entry entry[MAX_TRAVERSE_TREES]; |
| int i; |
| struct tree_desc_x tx[ARRAY_SIZE(entry)]; |
| struct strbuf base = STRBUF_INIT; |
| int interesting = 1; |
| char *traverse_path; |
| |
| if (n >= ARRAY_SIZE(entry)) |
| BUG("traverse_trees() called with too many trees (%d)", n); |
| |
| for (i = 0; i < n; i++) { |
| tx[i].d = t[i]; |
| tx[i].skip = NULL; |
| } |
| |
| if (info->prev) { |
| strbuf_make_traverse_path(&base, info->prev, |
| info->name, info->namelen); |
| strbuf_addch(&base, '/'); |
| traverse_path = xstrndup(base.buf, base.len); |
| } else { |
| traverse_path = xstrndup(info->name, info->pathlen); |
| } |
| info->traverse_path = traverse_path; |
| for (;;) { |
| int trees_used; |
| unsigned long mask, dirmask; |
| const char *first = NULL; |
| int first_len = 0; |
| struct name_entry *e = NULL; |
| int len; |
| |
| for (i = 0; i < n; i++) { |
| e = entry + i; |
| extended_entry_extract(tx + i, e, NULL, 0); |
| } |
| |
| /* |
| * A tree may have "t-2" at the current location even |
| * though it may have "t" that is a subtree behind it, |
| * and another tree may return "t". We want to grab |
| * all "t" from all trees to match in such a case. |
| */ |
| for (i = 0; i < n; i++) { |
| e = entry + i; |
| if (!e->path) |
| continue; |
| len = tree_entry_len(e); |
| if (!first) { |
| first = e->path; |
| first_len = len; |
| continue; |
| } |
| if (name_compare(e->path, len, first, first_len) < 0) { |
| first = e->path; |
| first_len = len; |
| } |
| } |
| |
| if (first) { |
| for (i = 0; i < n; i++) { |
| e = entry + i; |
| extended_entry_extract(tx + i, e, first, first_len); |
| /* Cull the ones that are not the earliest */ |
| if (!e->path) |
| continue; |
| len = tree_entry_len(e); |
| if (name_compare(e->path, len, first, first_len)) |
| entry_clear(e); |
| } |
| } |
| |
| /* Now we have in entry[i] the earliest name from the trees */ |
| mask = 0; |
| dirmask = 0; |
| for (i = 0; i < n; i++) { |
| if (!entry[i].path) |
| continue; |
| mask |= 1ul << i; |
| if (S_ISDIR(entry[i].mode)) |
| dirmask |= 1ul << i; |
| e = &entry[i]; |
| } |
| if (!mask) |
| break; |
| interesting = prune_traversal(istate, e, info, &base, interesting); |
| if (interesting < 0) |
| break; |
| if (interesting) { |
| trees_used = info->fn(n, mask, dirmask, entry, info); |
| if (trees_used < 0) { |
| error = trees_used; |
| if (!info->show_all_errors) |
| break; |
| } |
| mask &= trees_used; |
| } |
| for (i = 0; i < n; i++) |
| if (mask & (1ul << i)) |
| update_extended_entry(tx + i, entry + i); |
| } |
| for (i = 0; i < n; i++) |
| free_extended_entry(tx + i); |
| free(traverse_path); |
| info->traverse_path = NULL; |
| strbuf_release(&base); |
| return error; |
| } |
| |
| struct dir_state { |
| void *tree; |
| unsigned long size; |
| struct object_id oid; |
| }; |
| |
| static int find_tree_entry(struct repository *r, struct tree_desc *t, |
| const char *name, struct object_id *result, |
| unsigned short *mode) |
| { |
| int namelen = strlen(name); |
| while (t->size) { |
| const char *entry; |
| struct object_id oid; |
| int entrylen, cmp; |
| |
| oidcpy(&oid, tree_entry_extract(t, &entry, mode)); |
| entrylen = tree_entry_len(&t->entry); |
| update_tree_entry(t); |
| if (entrylen > namelen) |
| continue; |
| cmp = memcmp(name, entry, entrylen); |
| if (cmp > 0) |
| continue; |
| if (cmp < 0) |
| break; |
| if (entrylen == namelen) { |
| oidcpy(result, &oid); |
| return 0; |
| } |
| if (name[entrylen] != '/') |
| continue; |
| if (!S_ISDIR(*mode)) |
| break; |
| if (++entrylen == namelen) { |
| oidcpy(result, &oid); |
| return 0; |
| } |
| return get_tree_entry(r, &oid, name + entrylen, result, mode); |
| } |
| return -1; |
| } |
| |
| int get_tree_entry(struct repository *r, |
| const struct object_id *tree_oid, |
| const char *name, |
| struct object_id *oid, |
| unsigned short *mode) |
| { |
| int retval; |
| void *tree; |
| unsigned long size; |
| struct object_id root; |
| |
| tree = read_object_with_reference(r, tree_oid, tree_type, &size, &root); |
| if (!tree) |
| return -1; |
| |
| if (name[0] == '\0') { |
| oidcpy(oid, &root); |
| free(tree); |
| return 0; |
| } |
| |
| if (!size) { |
| retval = -1; |
| } else { |
| struct tree_desc t; |
| init_tree_desc(&t, tree, size); |
| retval = find_tree_entry(r, &t, name, oid, mode); |
| } |
| free(tree); |
| return retval; |
| } |
| |
| /* |
| * This is Linux's built-in max for the number of symlinks to follow. |
| * That limit, of course, does not affect git, but it's a reasonable |
| * choice. |
| */ |
| #define GET_TREE_ENTRY_FOLLOW_SYMLINKS_MAX_LINKS 40 |
| |
| /** |
| * Find a tree entry by following symlinks in tree_sha (which is |
| * assumed to be the root of the repository). In the event that a |
| * symlink points outside the repository (e.g. a link to /foo or a |
| * root-level link to ../foo), the portion of the link which is |
| * outside the repository will be returned in result_path, and *mode |
| * will be set to 0. It is assumed that result_path is uninitialized. |
| * If there are no symlinks, or the end result of the symlink chain |
| * points to an object inside the repository, result will be filled in |
| * with the sha1 of the found object, and *mode will hold the mode of |
| * the object. |
| * |
| * See the code for enum get_oid_result for a description of |
| * the return values. |
| */ |
| enum get_oid_result get_tree_entry_follow_symlinks(struct repository *r, |
| struct object_id *tree_oid, const char *name, |
| struct object_id *result, struct strbuf *result_path, |
| unsigned short *mode) |
| { |
| int retval = MISSING_OBJECT; |
| struct dir_state *parents = NULL; |
| size_t parents_alloc = 0; |
| size_t i, parents_nr = 0; |
| struct object_id current_tree_oid; |
| struct strbuf namebuf = STRBUF_INIT; |
| struct tree_desc t; |
| int follows_remaining = GET_TREE_ENTRY_FOLLOW_SYMLINKS_MAX_LINKS; |
| |
| init_tree_desc(&t, NULL, 0UL); |
| strbuf_addstr(&namebuf, name); |
| oidcpy(¤t_tree_oid, tree_oid); |
| |
| while (1) { |
| int find_result; |
| char *first_slash; |
| char *remainder = NULL; |
| |
| if (!t.buffer) { |
| void *tree; |
| struct object_id root; |
| unsigned long size; |
| tree = read_object_with_reference(r, |
| ¤t_tree_oid, |
| tree_type, &size, |
| &root); |
| if (!tree) |
| goto done; |
| |
| ALLOC_GROW(parents, parents_nr + 1, parents_alloc); |
| parents[parents_nr].tree = tree; |
| parents[parents_nr].size = size; |
| oidcpy(&parents[parents_nr].oid, &root); |
| parents_nr++; |
| |
| if (namebuf.buf[0] == '\0') { |
| oidcpy(result, &root); |
| retval = FOUND; |
| goto done; |
| } |
| |
| if (!size) |
| goto done; |
| |
| /* descend */ |
| init_tree_desc(&t, tree, size); |
| } |
| |
| /* Handle symlinks to e.g. a//b by removing leading slashes */ |
| while (namebuf.buf[0] == '/') { |
| strbuf_remove(&namebuf, 0, 1); |
| } |
| |
| /* Split namebuf into a first component and a remainder */ |
| if ((first_slash = strchr(namebuf.buf, '/'))) { |
| *first_slash = 0; |
| remainder = first_slash + 1; |
| } |
| |
| if (!strcmp(namebuf.buf, "..")) { |
| struct dir_state *parent; |
| /* |
| * We could end up with .. in the namebuf if it |
| * appears in a symlink. |
| */ |
| |
| if (parents_nr == 1) { |
| if (remainder) |
| *first_slash = '/'; |
| strbuf_add(result_path, namebuf.buf, |
| namebuf.len); |
| *mode = 0; |
| retval = FOUND; |
| goto done; |
| } |
| parent = &parents[parents_nr - 1]; |
| free(parent->tree); |
| parents_nr--; |
| parent = &parents[parents_nr - 1]; |
| init_tree_desc(&t, parent->tree, parent->size); |
| strbuf_remove(&namebuf, 0, remainder ? 3 : 2); |
| continue; |
| } |
| |
| /* We could end up here via a symlink to dir/.. */ |
| if (namebuf.buf[0] == '\0') { |
| oidcpy(result, &parents[parents_nr - 1].oid); |
| retval = FOUND; |
| goto done; |
| } |
| |
| /* Look up the first (or only) path component in the tree. */ |
| find_result = find_tree_entry(r, &t, namebuf.buf, |
| ¤t_tree_oid, mode); |
| if (find_result) { |
| goto done; |
| } |
| |
| if (S_ISDIR(*mode)) { |
| if (!remainder) { |
| oidcpy(result, ¤t_tree_oid); |
| retval = FOUND; |
| goto done; |
| } |
| /* Descend the tree */ |
| t.buffer = NULL; |
| strbuf_remove(&namebuf, 0, |
| 1 + first_slash - namebuf.buf); |
| } else if (S_ISREG(*mode)) { |
| if (!remainder) { |
| oidcpy(result, ¤t_tree_oid); |
| retval = FOUND; |
| } else { |
| retval = NOT_DIR; |
| } |
| goto done; |
| } else if (S_ISLNK(*mode)) { |
| /* Follow a symlink */ |
| unsigned long link_len; |
| size_t len; |
| char *contents, *contents_start; |
| struct dir_state *parent; |
| enum object_type type; |
| |
| if (follows_remaining-- == 0) { |
| /* Too many symlinks followed */ |
| retval = SYMLINK_LOOP; |
| goto done; |
| } |
| |
| /* |
| * At this point, we have followed at a least |
| * one symlink, so on error we need to report this. |
| */ |
| retval = DANGLING_SYMLINK; |
| |
| contents = repo_read_object_file(r, |
| ¤t_tree_oid, &type, |
| &link_len); |
| |
| if (!contents) |
| goto done; |
| |
| if (contents[0] == '/') { |
| strbuf_addstr(result_path, contents); |
| free(contents); |
| *mode = 0; |
| retval = FOUND; |
| goto done; |
| } |
| |
| if (remainder) |
| len = first_slash - namebuf.buf; |
| else |
| len = namebuf.len; |
| |
| contents_start = contents; |
| |
| parent = &parents[parents_nr - 1]; |
| init_tree_desc(&t, parent->tree, parent->size); |
| strbuf_splice(&namebuf, 0, len, |
| contents_start, link_len); |
| if (remainder) |
| namebuf.buf[link_len] = '/'; |
| free(contents); |
| } |
| } |
| done: |
| for (i = 0; i < parents_nr; i++) |
| free(parents[i].tree); |
| free(parents); |
| |
| strbuf_release(&namebuf); |
| return retval; |
| } |
| |
| static int match_entry(const struct pathspec_item *item, |
| const struct name_entry *entry, int pathlen, |
| const char *match, int matchlen, |
| enum interesting *never_interesting) |
| { |
| int m = -1; /* signals that we haven't called strncmp() */ |
| |
| if (item->magic & PATHSPEC_ICASE) |
| /* |
| * "Never interesting" trick requires exact |
| * matching. We could do something clever with inexact |
| * matching, but it's trickier (and not to forget that |
| * strcasecmp is locale-dependent, at least in |
| * glibc). Just disable it for now. It can't be worse |
| * than the wildcard's codepath of '[Tt][Hi][Is][Ss]' |
| * pattern. |
| */ |
| *never_interesting = entry_not_interesting; |
| else if (*never_interesting != entry_not_interesting) { |
| /* |
| * We have not seen any match that sorts later |
| * than the current path. |
| */ |
| |
| /* |
| * Does match sort strictly earlier than path |
| * with their common parts? |
| */ |
| m = strncmp(match, entry->path, |
| (matchlen < pathlen) ? matchlen : pathlen); |
| if (m < 0) |
| return 0; |
| |
| /* |
| * If we come here even once, that means there is at |
| * least one pathspec that would sort equal to or |
| * later than the path we are currently looking at. |
| * In other words, if we have never reached this point |
| * after iterating all pathspecs, it means all |
| * pathspecs are either outside of base, or inside the |
| * base but sorts strictly earlier than the current |
| * one. In either case, they will never match the |
| * subsequent entries. In such a case, we initialized |
| * the variable to -1 and that is what will be |
| * returned, allowing the caller to terminate early. |
| */ |
| *never_interesting = entry_not_interesting; |
| } |
| |
| if (pathlen > matchlen) |
| return 0; |
| |
| if (matchlen > pathlen) { |
| if (match[pathlen] != '/') |
| return 0; |
| /* |
| * Reject non-directories as partial pathnames, except |
| * when match is a submodule with a trailing slash and |
| * nothing else (to handle 'submod/' and 'submod' |
| * uniformly). |
| */ |
| if (!S_ISDIR(entry->mode) && |
| (!S_ISGITLINK(entry->mode) || matchlen > pathlen + 1)) |
| return 0; |
| } |
| |
| if (m == -1) |
| /* |
| * we cheated and did not do strncmp(), so we do |
| * that here. |
| */ |
| m = ps_strncmp(item, match, entry->path, pathlen); |
| |
| /* |
| * If common part matched earlier then it is a hit, |
| * because we rejected the case where path is not a |
| * leading directory and is shorter than match. |
| */ |
| if (!m) |
| /* |
| * match_entry does not check if the prefix part is |
| * matched case-sensitively. If the entry is a |
| * directory and part of prefix, it'll be rematched |
| * eventually by basecmp with special treatment for |
| * the prefix. |
| */ |
| return 1; |
| |
| return 0; |
| } |
| |
| /* :(icase)-aware string compare */ |
| static int basecmp(const struct pathspec_item *item, |
| const char *base, const char *match, int len) |
| { |
| if (item->magic & PATHSPEC_ICASE) { |
| int ret, n = len > item->prefix ? item->prefix : len; |
| ret = strncmp(base, match, n); |
| if (ret) |
| return ret; |
| base += n; |
| match += n; |
| len -= n; |
| } |
| return ps_strncmp(item, base, match, len); |
| } |
| |
| static int match_dir_prefix(const struct pathspec_item *item, |
| const char *base, |
| const char *match, int matchlen) |
| { |
| if (basecmp(item, base, match, matchlen)) |
| return 0; |
| |
| /* |
| * If the base is a subdirectory of a path which |
| * was specified, all of them are interesting. |
| */ |
| if (!matchlen || |
| base[matchlen] == '/' || |
| match[matchlen - 1] == '/') |
| return 1; |
| |
| /* Just a random prefix match */ |
| return 0; |
| } |
| |
| /* |
| * Perform matching on the leading non-wildcard part of |
| * pathspec. item->nowildcard_len must be greater than zero. Return |
| * non-zero if base is matched. |
| */ |
| static int match_wildcard_base(const struct pathspec_item *item, |
| const char *base, int baselen, |
| int *matched) |
| { |
| const char *match = item->match; |
| /* the wildcard part is not considered in this function */ |
| int matchlen = item->nowildcard_len; |
| |
| if (baselen) { |
| int dirlen; |
| /* |
| * Return early if base is longer than the |
| * non-wildcard part but it does not match. |
| */ |
| if (baselen >= matchlen) { |
| *matched = matchlen; |
| return !basecmp(item, base, match, matchlen); |
| } |
| |
| dirlen = matchlen; |
| while (dirlen && match[dirlen - 1] != '/') |
| dirlen--; |
| |
| /* |
| * Return early if base is shorter than the |
| * non-wildcard part but it does not match. Note that |
| * base ends with '/' so we are sure it really matches |
| * directory |
| */ |
| if (basecmp(item, base, match, baselen)) |
| return 0; |
| *matched = baselen; |
| } else |
| *matched = 0; |
| /* |
| * we could have checked entry against the non-wildcard part |
| * that is not in base and does similar never_interesting |
| * optimization as in match_entry. For now just be happy with |
| * base comparison. |
| */ |
| return entry_interesting; |
| } |
| |
| /* |
| * Is a tree entry interesting given the pathspec we have? |
| * |
| * Pre-condition: either baselen == base_offset (i.e. empty path) |
| * or base[baselen-1] == '/' (i.e. with trailing slash). |
| */ |
| static enum interesting do_match(struct index_state *istate, |
| const struct name_entry *entry, |
| struct strbuf *base, int base_offset, |
| const struct pathspec *ps, |
| int exclude) |
| { |
| int i; |
| int pathlen, baselen = base->len - base_offset; |
| enum interesting never_interesting = ps->has_wildcard ? |
| entry_not_interesting : all_entries_not_interesting; |
| |
| GUARD_PATHSPEC(ps, |
| PATHSPEC_FROMTOP | |
| PATHSPEC_MAXDEPTH | |
| PATHSPEC_LITERAL | |
| PATHSPEC_GLOB | |
| PATHSPEC_ICASE | |
| PATHSPEC_EXCLUDE | |
| PATHSPEC_ATTR); |
| |
| if (!ps->nr) { |
| if (!ps->recursive || |
| !(ps->magic & PATHSPEC_MAXDEPTH) || |
| ps->max_depth == -1) |
| return all_entries_interesting; |
| return within_depth(base->buf + base_offset, baselen, |
| !!S_ISDIR(entry->mode), |
| ps->max_depth) ? |
| entry_interesting : entry_not_interesting; |
| } |
| |
| pathlen = tree_entry_len(entry); |
| |
| for (i = ps->nr - 1; i >= 0; i--) { |
| const struct pathspec_item *item = ps->items+i; |
| const char *match = item->match; |
| const char *base_str = base->buf + base_offset; |
| int matchlen = item->len, matched = 0; |
| |
| if ((!exclude && item->magic & PATHSPEC_EXCLUDE) || |
| ( exclude && !(item->magic & PATHSPEC_EXCLUDE))) |
| continue; |
| |
| if (baselen >= matchlen) { |
| /* If it doesn't match, move along... */ |
| if (!match_dir_prefix(item, base_str, match, matchlen)) |
| goto match_wildcards; |
| |
| if (!ps->recursive || |
| !(ps->magic & PATHSPEC_MAXDEPTH) || |
| ps->max_depth == -1) { |
| if (!item->attr_match_nr) |
| return all_entries_interesting; |
| else |
| goto interesting; |
| } |
| |
| if (within_depth(base_str + matchlen + 1, |
| baselen - matchlen - 1, |
| !!S_ISDIR(entry->mode), |
| ps->max_depth)) |
| goto interesting; |
| else |
| return entry_not_interesting; |
| } |
| |
| /* Either there must be no base, or the base must match. */ |
| if (baselen == 0 || !basecmp(item, base_str, match, baselen)) { |
| if (match_entry(item, entry, pathlen, |
| match + baselen, matchlen - baselen, |
| &never_interesting)) |
| goto interesting; |
| |
| if (item->nowildcard_len < item->len) { |
| if (!git_fnmatch(item, match + baselen, entry->path, |
| item->nowildcard_len - baselen)) |
| goto interesting; |
| |
| /* |
| * Match all directories. We'll try to |
| * match files later on. |
| */ |
| if (ps->recursive && S_ISDIR(entry->mode)) |
| return entry_interesting; |
| |
| /* |
| * When matching against submodules with |
| * wildcard characters, ensure that the entry |
| * at least matches up to the first wild |
| * character. More accurate matching can then |
| * be performed in the submodule itself. |
| */ |
| if (ps->recurse_submodules && |
| S_ISGITLINK(entry->mode) && |
| !ps_strncmp(item, match + baselen, |
| entry->path, |
| item->nowildcard_len - baselen)) |
| goto interesting; |
| } |
| |
| continue; |
| } |
| |
| match_wildcards: |
| if (item->nowildcard_len == item->len) |
| continue; |
| |
| if (item->nowildcard_len && |
| !match_wildcard_base(item, base_str, baselen, &matched)) |
| continue; |
| |
| /* |
| * Concatenate base and entry->path into one and do |
| * fnmatch() on it. |
| * |
| * While we could avoid concatenation in certain cases |
| * [1], which saves a memcpy and potentially a |
| * realloc, it turns out not worth it. Measurement on |
| * linux-2.6 does not show any clear improvements, |
| * partly because of the nowildcard_len optimization |
| * in git_fnmatch(). Avoid micro-optimizations here. |
| * |
| * [1] if match_wildcard_base() says the base |
| * directory is already matched, we only need to match |
| * the rest, which is shorter so _in theory_ faster. |
| */ |
| |
| strbuf_add(base, entry->path, pathlen); |
| |
| if (!git_fnmatch(item, match, base->buf + base_offset, |
| item->nowildcard_len)) { |
| strbuf_setlen(base, base_offset + baselen); |
| goto interesting; |
| } |
| |
| /* |
| * When matching against submodules with |
| * wildcard characters, ensure that the entry |
| * at least matches up to the first wild |
| * character. More accurate matching can then |
| * be performed in the submodule itself. |
| */ |
| if (ps->recurse_submodules && S_ISGITLINK(entry->mode) && |
| !ps_strncmp(item, match, base->buf + base_offset, |
| item->nowildcard_len)) { |
| strbuf_setlen(base, base_offset + baselen); |
| goto interesting; |
| } |
| |
| strbuf_setlen(base, base_offset + baselen); |
| |
| /* |
| * Match all directories. We'll try to match files |
| * later on. |
| * max_depth is ignored but we may consider support it |
| * in future, see |
| * https://lore.kernel.org/git/7vmxo5l2g4.fsf@alter.siamese.dyndns.org/ |
| */ |
| if (ps->recursive && S_ISDIR(entry->mode)) |
| return entry_interesting; |
| continue; |
| interesting: |
| if (item->attr_match_nr) { |
| int ret; |
| |
| /* |
| * Must not return all_entries_not_interesting |
| * prematurely. We do not know if all entries do not |
| * match some attributes with current attr API. |
| */ |
| never_interesting = entry_not_interesting; |
| |
| /* |
| * Consider all directories interesting (because some |
| * of those files inside may match some attributes |
| * even though the parent dir does not) |
| * |
| * FIXME: attributes _can_ match directories and we |
| * can probably return all_entries_interesting or |
| * all_entries_not_interesting here if matched. |
| */ |
| if (S_ISDIR(entry->mode)) |
| return entry_interesting; |
| |
| strbuf_add(base, entry->path, pathlen); |
| ret = match_pathspec_attrs(istate, base->buf + base_offset, |
| base->len - base_offset, item); |
| strbuf_setlen(base, base_offset + baselen); |
| if (!ret) |
| continue; |
| } |
| return entry_interesting; |
| } |
| return never_interesting; /* No matches */ |
| } |
| |
| /* |
| * Is a tree entry interesting given the pathspec we have? |
| * |
| * Pre-condition: either baselen == base_offset (i.e. empty path) |
| * or base[baselen-1] == '/' (i.e. with trailing slash). |
| */ |
| enum interesting tree_entry_interesting(struct index_state *istate, |
| const struct name_entry *entry, |
| struct strbuf *base, int base_offset, |
| const struct pathspec *ps) |
| { |
| enum interesting positive, negative; |
| positive = do_match(istate, entry, base, base_offset, ps, 0); |
| |
| /* |
| * case | entry | positive | negative | result |
| * -----+-------+----------+----------+------- |
| * 1 | file | -1 | -1..2 | -1 |
| * 2 | file | 0 | -1..2 | 0 |
| * 3 | file | 1 | -1 | 1 |
| * 4 | file | 1 | 0 | 1 |
| * 5 | file | 1 | 1 | 0 |
| * 6 | file | 1 | 2 | 0 |
| * 7 | file | 2 | -1 | 2 |
| * 8 | file | 2 | 0 | 1 |
| * 9 | file | 2 | 1 | 0 |
| * 10 | file | 2 | 2 | -1 |
| * -----+-------+----------+----------+------- |
| * 11 | dir | -1 | -1..2 | -1 |
| * 12 | dir | 0 | -1..2 | 0 |
| * 13 | dir | 1 | -1 | 1 |
| * 14 | dir | 1 | 0 | 1 |
| * 15 | dir | 1 | 1 | 1 (*) |
| * 16 | dir | 1 | 2 | 0 |
| * 17 | dir | 2 | -1 | 2 |
| * 18 | dir | 2 | 0 | 1 |
| * 19 | dir | 2 | 1 | 1 (*) |
| * 20 | dir | 2 | 2 | -1 |
| * |
| * (*) An exclude pattern interested in a directory does not |
| * necessarily mean it will exclude all of the directory. In |
| * wildcard case, it can't decide until looking at individual |
| * files inside. So don't write such directories off yet. |
| */ |
| |
| if (!(ps->magic & PATHSPEC_EXCLUDE) || |
| positive <= entry_not_interesting) /* #1, #2, #11, #12 */ |
| return positive; |
| |
| negative = do_match(istate, entry, base, base_offset, ps, 1); |
| |
| /* #8, #18 */ |
| if (positive == all_entries_interesting && |
| negative == entry_not_interesting) |
| return entry_interesting; |
| |
| /* #3, #4, #7, #13, #14, #17 */ |
| if (negative <= entry_not_interesting) |
| return positive; |
| |
| /* #15, #19 */ |
| if (S_ISDIR(entry->mode) && |
| positive >= entry_interesting && |
| negative == entry_interesting) |
| return entry_interesting; |
| |
| if ((positive == entry_interesting && |
| negative >= entry_interesting) || /* #5, #6, #16 */ |
| (positive == all_entries_interesting && |
| negative == entry_interesting)) /* #9 */ |
| return entry_not_interesting; |
| |
| return all_entries_not_interesting; /* #10, #20 */ |
| } |