diff options
Diffstat (limited to 'third_party/git/attr.c')
| -rw-r--r-- | third_party/git/attr.c | 1159 |
1 files changed, 0 insertions, 1159 deletions
diff --git a/third_party/git/attr.c b/third_party/git/attr.c deleted file mode 100644 index 93dc16b59c..0000000000 --- a/third_party/git/attr.c +++ /dev/null @@ -1,1159 +0,0 @@ -/* - * Handle git attributes. See gitattributes(5) for a description of - * the file syntax, and Documentation/technical/api-gitattributes.txt - * for a description of the API. - * - * One basic design decision here is that we are not going to support - * an insanely large number of attributes. - */ - -#include "cache.h" -#include "config.h" -#include "exec-cmd.h" -#include "attr.h" -#include "dir.h" -#include "utf8.h" -#include "quote.h" -#include "thread-utils.h" - -const char git_attr__true[] = "(builtin)true"; -const char git_attr__false[] = "\0(builtin)false"; -static const char git_attr__unknown[] = "(builtin)unknown"; -#define ATTR__TRUE git_attr__true -#define ATTR__FALSE git_attr__false -#define ATTR__UNSET NULL -#define ATTR__UNKNOWN git_attr__unknown - -#ifndef DEBUG_ATTR -#define DEBUG_ATTR 0 -#endif - -struct git_attr { - int attr_nr; /* unique attribute number */ - char name[FLEX_ARRAY]; /* attribute name */ -}; - -const char *git_attr_name(const struct git_attr *attr) -{ - return attr->name; -} - -struct attr_hashmap { - struct hashmap map; - pthread_mutex_t mutex; -}; - -static inline void hashmap_lock(struct attr_hashmap *map) -{ - pthread_mutex_lock(&map->mutex); -} - -static inline void hashmap_unlock(struct attr_hashmap *map) -{ - pthread_mutex_unlock(&map->mutex); -} - -/* - * The global dictionary of all interned attributes. This - * is a singleton object which is shared between threads. - * Access to this dictionary must be surrounded with a mutex. - */ -static struct attr_hashmap g_attr_hashmap; - -/* The container for objects stored in "struct attr_hashmap" */ -struct attr_hash_entry { - struct hashmap_entry ent; /* must be the first member! */ - const char *key; /* the key; memory should be owned by value */ - size_t keylen; /* length of the key */ - void *value; /* the stored value */ -}; - -/* attr_hashmap comparison function */ -static int attr_hash_entry_cmp(const void *unused_cmp_data, - const void *entry, - const void *entry_or_key, - const void *unused_keydata) -{ - const struct attr_hash_entry *a = entry; - const struct attr_hash_entry *b = entry_or_key; - return (a->keylen != b->keylen) || strncmp(a->key, b->key, a->keylen); -} - -/* Initialize an 'attr_hashmap' object */ -static void attr_hashmap_init(struct attr_hashmap *map) -{ - hashmap_init(&map->map, attr_hash_entry_cmp, NULL, 0); -} - -/* - * Retrieve the 'value' stored in a hashmap given the provided 'key'. - * If there is no matching entry, return NULL. - */ -static void *attr_hashmap_get(struct attr_hashmap *map, - const char *key, size_t keylen) -{ - struct attr_hash_entry k; - struct attr_hash_entry *e; - - if (!map->map.tablesize) - attr_hashmap_init(map); - - hashmap_entry_init(&k, memhash(key, keylen)); - k.key = key; - k.keylen = keylen; - e = hashmap_get(&map->map, &k, NULL); - - return e ? e->value : NULL; -} - -/* Add 'value' to a hashmap based on the provided 'key'. */ -static void attr_hashmap_add(struct attr_hashmap *map, - const char *key, size_t keylen, - void *value) -{ - struct attr_hash_entry *e; - - if (!map->map.tablesize) - attr_hashmap_init(map); - - e = xmalloc(sizeof(struct attr_hash_entry)); - hashmap_entry_init(e, memhash(key, keylen)); - e->key = key; - e->keylen = keylen; - e->value = value; - - hashmap_add(&map->map, e); -} - -struct all_attrs_item { - const struct git_attr *attr; - const char *value; - /* - * If 'macro' is non-NULL, indicates that 'attr' is a macro based on - * the current attribute stack and contains a pointer to the match_attr - * definition of the macro - */ - const struct match_attr *macro; -}; - -/* - * Reallocate and reinitialize the array of all attributes (which is used in - * the attribute collection process) in 'check' based on the global dictionary - * of attributes. - */ -static void all_attrs_init(struct attr_hashmap *map, struct attr_check *check) -{ - int i; - unsigned int size; - - hashmap_lock(map); - - size = hashmap_get_size(&map->map); - if (size < check->all_attrs_nr) - BUG("interned attributes shouldn't be deleted"); - - /* - * If the number of attributes in the global dictionary has increased - * (or this attr_check instance doesn't have an initialized all_attrs - * field), reallocate the provided attr_check instance's all_attrs - * field and fill each entry with its corresponding git_attr. - */ - if (size != check->all_attrs_nr) { - struct attr_hash_entry *e; - struct hashmap_iter iter; - hashmap_iter_init(&map->map, &iter); - - REALLOC_ARRAY(check->all_attrs, size); - check->all_attrs_nr = size; - - while ((e = hashmap_iter_next(&iter))) { - const struct git_attr *a = e->value; - check->all_attrs[a->attr_nr].attr = a; - } - } - - hashmap_unlock(map); - - /* - * Re-initialize every entry in check->all_attrs. - * This re-initialization can live outside of the locked region since - * the attribute dictionary is no longer being accessed. - */ - for (i = 0; i < check->all_attrs_nr; i++) { - check->all_attrs[i].value = ATTR__UNKNOWN; - check->all_attrs[i].macro = NULL; - } -} - -static int attr_name_valid(const char *name, size_t namelen) -{ - /* - * Attribute name cannot begin with '-' and must consist of - * characters from [-A-Za-z0-9_.]. - */ - if (namelen <= 0 || *name == '-') - return 0; - while (namelen--) { - char ch = *name++; - if (! (ch == '-' || ch == '.' || ch == '_' || - ('0' <= ch && ch <= '9') || - ('a' <= ch && ch <= 'z') || - ('A' <= ch && ch <= 'Z')) ) - return 0; - } - return 1; -} - -static void report_invalid_attr(const char *name, size_t len, - const char *src, int lineno) -{ - struct strbuf err = STRBUF_INIT; - strbuf_addf(&err, _("%.*s is not a valid attribute name"), - (int) len, name); - fprintf(stderr, "%s: %s:%d\n", err.buf, src, lineno); - strbuf_release(&err); -} - -/* - * Given a 'name', lookup and return the corresponding attribute in the global - * dictionary. If no entry is found, create a new attribute and store it in - * the dictionary. - */ -static const struct git_attr *git_attr_internal(const char *name, int namelen) -{ - struct git_attr *a; - - if (!attr_name_valid(name, namelen)) - return NULL; - - hashmap_lock(&g_attr_hashmap); - - a = attr_hashmap_get(&g_attr_hashmap, name, namelen); - - if (!a) { - FLEX_ALLOC_MEM(a, name, name, namelen); - a->attr_nr = hashmap_get_size(&g_attr_hashmap.map); - - attr_hashmap_add(&g_attr_hashmap, a->name, namelen, a); - assert(a->attr_nr == - (hashmap_get_size(&g_attr_hashmap.map) - 1)); - } - - hashmap_unlock(&g_attr_hashmap); - - return a; -} - -const struct git_attr *git_attr(const char *name) -{ - return git_attr_internal(name, strlen(name)); -} - -/* What does a matched pattern decide? */ -struct attr_state { - const struct git_attr *attr; - const char *setto; -}; - -struct pattern { - const char *pattern; - int patternlen; - int nowildcardlen; - unsigned flags; /* EXC_FLAG_* */ -}; - -/* - * One rule, as from a .gitattributes file. - * - * If is_macro is true, then u.attr is a pointer to the git_attr being - * defined. - * - * If is_macro is false, then u.pat is the filename pattern to which the - * rule applies. - * - * In either case, num_attr is the number of attributes affected by - * this rule, and state is an array listing them. The attributes are - * listed as they appear in the file (macros unexpanded). - */ -struct match_attr { - union { - struct pattern pat; - const struct git_attr *attr; - } u; - char is_macro; - unsigned num_attr; - struct attr_state state[FLEX_ARRAY]; -}; - -static const char blank[] = " \t\r\n"; - -/* - * Parse a whitespace-delimited attribute state (i.e., "attr", - * "-attr", "!attr", or "attr=value") from the string starting at src. - * If e is not NULL, write the results to *e. Return a pointer to the - * remainder of the string (with leading whitespace removed), or NULL - * if there was an error. - */ -static const char *parse_attr(const char *src, int lineno, const char *cp, - struct attr_state *e) -{ - const char *ep, *equals; - int len; - - ep = cp + strcspn(cp, blank); - equals = strchr(cp, '='); - if (equals && ep < equals) - equals = NULL; - if (equals) - len = equals - cp; - else - len = ep - cp; - if (!e) { - if (*cp == '-' || *cp == '!') { - cp++; - len--; - } - if (!attr_name_valid(cp, len)) { - report_invalid_attr(cp, len, src, lineno); - return NULL; - } - } else { - /* - * As this function is always called twice, once with - * e == NULL in the first pass and then e != NULL in - * the second pass, no need for attr_name_valid() - * check here. - */ - if (*cp == '-' || *cp == '!') { - e->setto = (*cp == '-') ? ATTR__FALSE : ATTR__UNSET; - cp++; - len--; - } - else if (!equals) - e->setto = ATTR__TRUE; - else { - e->setto = xmemdupz(equals + 1, ep - equals - 1); - } - e->attr = git_attr_internal(cp, len); - } - return ep + strspn(ep, blank); -} - -static struct match_attr *parse_attr_line(const char *line, const char *src, - int lineno, int macro_ok) -{ - int namelen; - int num_attr, i; - const char *cp, *name, *states; - struct match_attr *res = NULL; - int is_macro; - struct strbuf pattern = STRBUF_INIT; - - cp = line + strspn(line, blank); - if (!*cp || *cp == '#') - return NULL; - name = cp; - - if (*cp == '"' && !unquote_c_style(&pattern, name, &states)) { - name = pattern.buf; - namelen = pattern.len; - } else { - namelen = strcspn(name, blank); - states = name + namelen; - } - - if (strlen(ATTRIBUTE_MACRO_PREFIX) < namelen && - starts_with(name, ATTRIBUTE_MACRO_PREFIX)) { - if (!macro_ok) { - fprintf_ln(stderr, _("%s not allowed: %s:%d"), - name, src, lineno); - goto fail_return; - } - is_macro = 1; - name += strlen(ATTRIBUTE_MACRO_PREFIX); - name += strspn(name, blank); - namelen = strcspn(name, blank); - if (!attr_name_valid(name, namelen)) { - report_invalid_attr(name, namelen, src, lineno); - goto fail_return; - } - } - else - is_macro = 0; - - states += strspn(states, blank); - - /* First pass to count the attr_states */ - for (cp = states, num_attr = 0; *cp; num_attr++) { - cp = parse_attr(src, lineno, cp, NULL); - if (!cp) - goto fail_return; - } - - res = xcalloc(1, - sizeof(*res) + - sizeof(struct attr_state) * num_attr + - (is_macro ? 0 : namelen + 1)); - if (is_macro) { - res->u.attr = git_attr_internal(name, namelen); - } else { - char *p = (char *)&(res->state[num_attr]); - memcpy(p, name, namelen); - res->u.pat.pattern = p; - parse_exclude_pattern(&res->u.pat.pattern, - &res->u.pat.patternlen, - &res->u.pat.flags, - &res->u.pat.nowildcardlen); - if (res->u.pat.flags & EXC_FLAG_NEGATIVE) { - warning(_("Negative patterns are ignored in git attributes\n" - "Use '\\!' for literal leading exclamation.")); - goto fail_return; - } - } - res->is_macro = is_macro; - res->num_attr = num_attr; - - /* Second pass to fill the attr_states */ - for (cp = states, i = 0; *cp; i++) { - cp = parse_attr(src, lineno, cp, &(res->state[i])); - } - - strbuf_release(&pattern); - return res; - -fail_return: - strbuf_release(&pattern); - free(res); - return NULL; -} - -/* - * Like info/exclude and .gitignore, the attribute information can - * come from many places. - * - * (1) .gitattributes file of the same directory; - * (2) .gitattributes file of the parent directory if (1) does not have - * any match; this goes recursively upwards, just like .gitignore. - * (3) $GIT_DIR/info/attributes, which overrides both of the above. - * - * In the same file, later entries override the earlier match, so in the - * global list, we would have entries from info/attributes the earliest - * (reading the file from top to bottom), .gitattributes of the root - * directory (again, reading the file from top to bottom) down to the - * current directory, and then scan the list backwards to find the first match. - * This is exactly the same as what is_excluded() does in dir.c to deal with - * .gitignore file and info/excludes file as a fallback. - */ - -struct attr_stack { - struct attr_stack *prev; - char *origin; - size_t originlen; - unsigned num_matches; - unsigned alloc; - struct match_attr **attrs; -}; - -static void attr_stack_free(struct attr_stack *e) -{ - int i; - free(e->origin); - for (i = 0; i < e->num_matches; i++) { - struct match_attr *a = e->attrs[i]; - int j; - for (j = 0; j < a->num_attr; j++) { - const char *setto = a->state[j].setto; - if (setto == ATTR__TRUE || - setto == ATTR__FALSE || - setto == ATTR__UNSET || - setto == ATTR__UNKNOWN) - ; - else - free((char *) setto); - } - free(a); - } - free(e->attrs); - free(e); -} - -static void drop_attr_stack(struct attr_stack **stack) -{ - while (*stack) { - struct attr_stack *elem = *stack; - *stack = elem->prev; - attr_stack_free(elem); - } -} - -/* List of all attr_check structs; access should be surrounded by mutex */ -static struct check_vector { - size_t nr; - size_t alloc; - struct attr_check **checks; - pthread_mutex_t mutex; -} check_vector; - -static inline void vector_lock(void) -{ - pthread_mutex_lock(&check_vector.mutex); -} - -static inline void vector_unlock(void) -{ - pthread_mutex_unlock(&check_vector.mutex); -} - -static void check_vector_add(struct attr_check *c) -{ - vector_lock(); - - ALLOC_GROW(check_vector.checks, - check_vector.nr + 1, - check_vector.alloc); - check_vector.checks[check_vector.nr++] = c; - - vector_unlock(); -} - -static void check_vector_remove(struct attr_check *check) -{ - int i; - - vector_lock(); - - /* Find entry */ - for (i = 0; i < check_vector.nr; i++) - if (check_vector.checks[i] == check) - break; - - if (i >= check_vector.nr) - BUG("no entry found"); - - /* shift entries over */ - for (; i < check_vector.nr - 1; i++) - check_vector.checks[i] = check_vector.checks[i + 1]; - - check_vector.nr--; - - vector_unlock(); -} - -/* Iterate through all attr_check instances and drop their stacks */ -static void drop_all_attr_stacks(void) -{ - int i; - - vector_lock(); - - for (i = 0; i < check_vector.nr; i++) { - drop_attr_stack(&check_vector.checks[i]->stack); - } - - vector_unlock(); -} - -struct attr_check *attr_check_alloc(void) -{ - struct attr_check *c = xcalloc(1, sizeof(struct attr_check)); - - /* save pointer to the check struct */ - check_vector_add(c); - - return c; -} - -struct attr_check *attr_check_initl(const char *one, ...) -{ - struct attr_check *check; - int cnt; - va_list params; - const char *param; - - va_start(params, one); - for (cnt = 1; (param = va_arg(params, const char *)) != NULL; cnt++) - ; - va_end(params); - - check = attr_check_alloc(); - check->nr = cnt; - check->alloc = cnt; - check->items = xcalloc(cnt, sizeof(struct attr_check_item)); - - check->items[0].attr = git_attr(one); - va_start(params, one); - for (cnt = 1; cnt < check->nr; cnt++) { - const struct git_attr *attr; - param = va_arg(params, const char *); - if (!param) - BUG("counted %d != ended at %d", - check->nr, cnt); - attr = git_attr(param); - if (!attr) - BUG("%s: not a valid attribute name", param); - check->items[cnt].attr = attr; - } - va_end(params); - return check; -} - -struct attr_check *attr_check_dup(const struct attr_check *check) -{ - struct attr_check *ret; - - if (!check) - return NULL; - - ret = attr_check_alloc(); - - ret->nr = check->nr; - ret->alloc = check->alloc; - ALLOC_ARRAY(ret->items, ret->nr); - COPY_ARRAY(ret->items, check->items, ret->nr); - - return ret; -} - -struct attr_check_item *attr_check_append(struct attr_check *check, - const struct git_attr *attr) -{ - struct attr_check_item *item; - - ALLOC_GROW(check->items, check->nr + 1, check->alloc); - item = &check->items[check->nr++]; - item->attr = attr; - return item; -} - -void attr_check_reset(struct attr_check *check) -{ - check->nr = 0; -} - -void attr_check_clear(struct attr_check *check) -{ - FREE_AND_NULL(check->items); - check->alloc = 0; - check->nr = 0; - - FREE_AND_NULL(check->all_attrs); - check->all_attrs_nr = 0; - - drop_attr_stack(&check->stack); -} - -void attr_check_free(struct attr_check *check) -{ - if (check) { - /* Remove check from the check vector */ - check_vector_remove(check); - - attr_check_clear(check); - free(check); - } -} - -static const char *builtin_attr[] = { - "[attr]binary -diff -merge -text", - NULL, -}; - -static void handle_attr_line(struct attr_stack *res, - const char *line, - const char *src, - int lineno, - int macro_ok) -{ - struct match_attr *a; - - a = parse_attr_line(line, src, lineno, macro_ok); - if (!a) - return; - ALLOC_GROW(res->attrs, res->num_matches + 1, res->alloc); - res->attrs[res->num_matches++] = a; -} - -static struct attr_stack *read_attr_from_array(const char **list) -{ - struct attr_stack *res; - const char *line; - int lineno = 0; - - res = xcalloc(1, sizeof(*res)); - while ((line = *(list++)) != NULL) - handle_attr_line(res, line, "[builtin]", ++lineno, 1); - return res; -} - -/* - * Callers into the attribute system assume there is a single, system-wide - * global state where attributes are read from and when the state is flipped by - * calling git_attr_set_direction(), the stack frames that have been - * constructed need to be discarded so so that subsequent calls into the - * attribute system will lazily read from the right place. Since changing - * direction causes a global paradigm shift, it should not ever be called while - * another thread could potentially be calling into the attribute system. - */ -static enum git_attr_direction direction; - -void git_attr_set_direction(enum git_attr_direction new_direction) -{ - if (is_bare_repository() && new_direction != GIT_ATTR_INDEX) - BUG("non-INDEX attr direction in a bare repo"); - - if (new_direction != direction) - drop_all_attr_stacks(); - - direction = new_direction; -} - -static struct attr_stack *read_attr_from_file(const char *path, int macro_ok) -{ - FILE *fp = fopen_or_warn(path, "r"); - struct attr_stack *res; - char buf[2048]; - int lineno = 0; - - if (!fp) - return NULL; - res = xcalloc(1, sizeof(*res)); - while (fgets(buf, sizeof(buf), fp)) { - char *bufp = buf; - if (!lineno) - skip_utf8_bom(&bufp, strlen(bufp)); - handle_attr_line(res, bufp, path, ++lineno, macro_ok); - } - fclose(fp); - return res; -} - -static struct attr_stack *read_attr_from_index(const struct index_state *istate, - const char *path, - int macro_ok) -{ - struct attr_stack *res; - char *buf, *sp; - int lineno = 0; - - if (!istate) - return NULL; - - buf = read_blob_data_from_index(istate, path, NULL); - if (!buf) - return NULL; - - res = xcalloc(1, sizeof(*res)); - for (sp = buf; *sp; ) { - char *ep; - int more; - - ep = strchrnul(sp, '\n'); - more = (*ep == '\n'); - *ep = '\0'; - handle_attr_line(res, sp, path, ++lineno, macro_ok); - sp = ep + more; - } - free(buf); - return res; -} - -static struct attr_stack *read_attr(const struct index_state *istate, - const char *path, int macro_ok) -{ - struct attr_stack *res = NULL; - - if (direction == GIT_ATTR_INDEX) { - res = read_attr_from_index(istate, path, macro_ok); - } else if (!is_bare_repository()) { - if (direction == GIT_ATTR_CHECKOUT) { - res = read_attr_from_index(istate, path, macro_ok); - if (!res) - res = read_attr_from_file(path, macro_ok); - } else if (direction == GIT_ATTR_CHECKIN) { - res = read_attr_from_file(path, macro_ok); - if (!res) - /* - * There is no checked out .gitattributes file - * there, but we might have it in the index. - * We allow operation in a sparsely checked out - * work tree, so read from it. - */ - res = read_attr_from_index(istate, path, macro_ok); - } - } - - if (!res) - res = xcalloc(1, sizeof(*res)); - return res; -} - -#if DEBUG_ATTR -static void debug_info(const char *what, struct attr_stack *elem) -{ - fprintf(stderr, "%s: %s\n", what, elem->origin ? elem->origin : "()"); -} -static void debug_set(const char *what, const char *match, struct git_attr *attr, const void *v) -{ - const char *value = v; - - if (ATTR_TRUE(value)) - value = "set"; - else if (ATTR_FALSE(value)) - value = "unset"; - else if (ATTR_UNSET(value)) - value = "unspecified"; - - fprintf(stderr, "%s: %s => %s (%s)\n", - what, attr->name, (char *) value, match); -} -#define debug_push(a) debug_info("push", (a)) -#define debug_pop(a) debug_info("pop", (a)) -#else -#define debug_push(a) do { ; } while (0) -#define debug_pop(a) do { ; } while (0) -#define debug_set(a,b,c,d) do { ; } while (0) -#endif /* DEBUG_ATTR */ - -static const char *git_etc_gitattributes(void) -{ - static const char *system_wide; - if (!system_wide) - system_wide = system_path(ETC_GITATTRIBUTES); - return system_wide; -} - -static const char *get_home_gitattributes(void) -{ - if (!git_attributes_file) - git_attributes_file = xdg_config_home("attributes"); - - return git_attributes_file; -} - -static int git_attr_system(void) -{ - return !git_env_bool("GIT_ATTR_NOSYSTEM", 0); -} - -static GIT_PATH_FUNC(git_path_info_attributes, INFOATTRIBUTES_FILE) - -static void push_stack(struct attr_stack **attr_stack_p, - struct attr_stack *elem, char *origin, size_t originlen) -{ - if (elem) { - elem->origin = origin; - if (origin) - elem->originlen = originlen; - elem->prev = *attr_stack_p; - *attr_stack_p = elem; - } -} - -static void bootstrap_attr_stack(const struct index_state *istate, - struct attr_stack **stack) -{ - struct attr_stack *e; - - if (*stack) - return; - - /* builtin frame */ - e = read_attr_from_array(builtin_attr); - push_stack(stack, e, NULL, 0); - - /* system-wide frame */ - if (git_attr_system()) { - e = read_attr_from_file(git_etc_gitattributes(), 1); - push_stack(stack, e, NULL, 0); - } - - /* home directory */ - if (get_home_gitattributes()) { - e = read_attr_from_file(get_home_gitattributes(), 1); - push_stack(stack, e, NULL, 0); - } - - /* root directory */ - e = read_attr(istate, GITATTRIBUTES_FILE, 1); - push_stack(stack, e, xstrdup(""), 0); - - /* info frame */ - if (startup_info->have_repository) - e = read_attr_from_file(git_path_info_attributes(), 1); - else - e = NULL; - if (!e) - e = xcalloc(1, sizeof(struct attr_stack)); - push_stack(stack, e, NULL, 0); -} - -static void prepare_attr_stack(const struct index_state *istate, - const char *path, int dirlen, - struct attr_stack **stack) -{ - struct attr_stack *info; - struct strbuf pathbuf = STRBUF_INIT; - - /* - * At the bottom of the attribute stack is the built-in - * set of attribute definitions, followed by the contents - * of $(prefix)/etc/gitattributes and a file specified by - * core.attributesfile. Then, contents from - * .gitattributes files from directories closer to the - * root to the ones in deeper directories are pushed - * to the stack. Finally, at the very top of the stack - * we always keep the contents of $GIT_DIR/info/attributes. - * - * When checking, we use entries from near the top of the - * stack, preferring $GIT_DIR/info/attributes, then - * .gitattributes in deeper directories to shallower ones, - * and finally use the built-in set as the default. - */ - bootstrap_attr_stack(istate, stack); - - /* - * Pop the "info" one that is always at the top of the stack. - */ - info = *stack; - *stack = info->prev; - - /* - * Pop the ones from directories that are not the prefix of - * the path we are checking. Break out of the loop when we see - * the root one (whose origin is an empty string "") or the builtin - * one (whose origin is NULL) without popping it. - */ - while ((*stack)->origin) { - int namelen = (*stack)->originlen; - struct attr_stack *elem; - - elem = *stack; - if (namelen <= dirlen && - !strncmp(elem->origin, path, namelen) && - (!namelen || path[namelen] == '/')) - break; - - debug_pop(elem); - *stack = elem->prev; - attr_stack_free(elem); - } - - /* - * bootstrap_attr_stack() should have added, and the - * above loop should have stopped before popping, the - * root element whose attr_stack->origin is set to an - * empty string. - */ - assert((*stack)->origin); - - strbuf_addstr(&pathbuf, (*stack)->origin); - /* Build up to the directory 'path' is in */ - while (pathbuf.len < dirlen) { - size_t len = pathbuf.len; - struct attr_stack *next; - char *origin; - - /* Skip path-separator */ - if (len < dirlen && is_dir_sep(path[len])) - len++; - /* Find the end of the next component */ - while (len < dirlen && !is_dir_sep(path[len])) - len++; - - if (pathbuf.len > 0) - strbuf_addch(&pathbuf, '/'); - strbuf_add(&pathbuf, path + pathbuf.len, (len - pathbuf.len)); - strbuf_addf(&pathbuf, "/%s", GITATTRIBUTES_FILE); - - next = read_attr(istate, pathbuf.buf, 0); - - /* reset the pathbuf to not include "/.gitattributes" */ - strbuf_setlen(&pathbuf, len); - - origin = xstrdup(pathbuf.buf); - push_stack(stack, next, origin, len); - } - - /* - * Finally push the "info" one at the top of the stack. - */ - push_stack(stack, info, NULL, 0); - - strbuf_release(&pathbuf); -} - -static int path_matches(const char *pathname, int pathlen, - int basename_offset, - const struct pattern *pat, - const char *base, int baselen) -{ - const char *pattern = pat->pattern; - int prefix = pat->nowildcardlen; - int isdir = (pathlen && pathname[pathlen - 1] == '/'); - - if ((pat->flags & EXC_FLAG_MUSTBEDIR) && !isdir) - return 0; - - if (pat->flags & EXC_FLAG_NODIR) { - return match_basename(pathname + basename_offset, - pathlen - basename_offset - isdir, - pattern, prefix, - pat->patternlen, pat->flags); - } - return match_pathname(pathname, pathlen - isdir, - base, baselen, - pattern, prefix, pat->patternlen, pat->flags); -} - -static int macroexpand_one(struct all_attrs_item *all_attrs, int nr, int rem); - -static int fill_one(const char *what, struct all_attrs_item *all_attrs, - const struct match_attr *a, int rem) -{ - int i; - - for (i = a->num_attr - 1; rem > 0 && i >= 0; i--) { - const struct git_attr *attr = a->state[i].attr; - const char **n = &(all_attrs[attr->attr_nr].value); - const char *v = a->state[i].setto; - - if (*n == ATTR__UNKNOWN) { - debug_set(what, - a->is_macro ? a->u.attr->name : a->u.pat.pattern, - attr, v); - *n = v; - rem--; - rem = macroexpand_one(all_attrs, attr->attr_nr, rem); - } - } - return rem; -} - -static int fill(const char *path, int pathlen, int basename_offset, - const struct attr_stack *stack, - struct all_attrs_item *all_attrs, int rem) -{ - for (; rem > 0 && stack; stack = stack->prev) { - int i; - const char *base = stack->origin ? stack->origin : ""; - - for (i = stack->num_matches - 1; 0 < rem && 0 <= i; i--) { - const struct match_attr *a = stack->attrs[i]; - if (a->is_macro) - continue; - if (path_matches(path, pathlen, basename_offset, - &a->u.pat, base, stack->originlen)) - rem = fill_one("fill", all_attrs, a, rem); - } - } - - return rem; -} - -static int macroexpand_one(struct all_attrs_item *all_attrs, int nr, int rem) -{ - const struct all_attrs_item *item = &all_attrs[nr]; - - if (item->macro && item->value == ATTR__TRUE) - return fill_one("expand", all_attrs, item->macro, rem); - else - return rem; -} - -/* - * Marks the attributes which are macros based on the attribute stack. - * This prevents having to search through the attribute stack each time - * a macro needs to be expanded during the fill stage. - */ -static void determine_macros(struct all_attrs_item *all_attrs, - const struct attr_stack *stack) -{ - for (; stack; stack = stack->prev) { - int i; - for (i = stack->num_matches - 1; i >= 0; i--) { - const struct match_attr *ma = stack->attrs[i]; - if (ma->is_macro) { - int n = ma->u.attr->attr_nr; - if (!all_attrs[n].macro) { - all_attrs[n].macro = ma; - } - } - } - } -} - -/* - * Collect attributes for path into the array pointed to by check->all_attrs. - * If check->check_nr is non-zero, only attributes in check[] are collected. - * Otherwise all attributes are collected. - */ -static void collect_some_attrs(const struct index_state *istate, - const char *path, - struct attr_check *check) -{ - int pathlen, rem, dirlen; - const char *cp, *last_slash = NULL; - int basename_offset; - - for (cp = path; *cp; cp++) { - if (*cp == '/' && cp[1]) - last_slash = cp; - } - pathlen = cp - path; - if (last_slash) { - basename_offset = last_slash + 1 - path; - dirlen = last_slash - path; - } else { - basename_offset = 0; - dirlen = 0; - } - - prepare_attr_stack(istate, path, dirlen, &check->stack); - all_attrs_init(&g_attr_hashmap, check); - determine_macros(check->all_attrs, check->stack); - - rem = check->all_attrs_nr; - fill(path, pathlen, basename_offset, check->stack, check->all_attrs, rem); -} - -void git_check_attr(const struct index_state *istate, - const char *path, - struct attr_check *check) -{ - int i; - - collect_some_attrs(istate, path, check); - - for (i = 0; i < check->nr; i++) { - size_t n = check->items[i].attr->attr_nr; - const char *value = check->all_attrs[n].value; - if (value == ATTR__UNKNOWN) - value = ATTR__UNSET; - check->items[i].value = value; - } -} - -void git_all_attrs(const struct index_state *istate, - const char *path, struct attr_check *check) -{ - int i; - - attr_check_reset(check); - collect_some_attrs(istate, path, check); - - for (i = 0; i < check->all_attrs_nr; i++) { - const char *name = check->all_attrs[i].attr->name; - const char *value = check->all_attrs[i].value; - struct attr_check_item *item; - if (value == ATTR__UNSET || value == ATTR__UNKNOWN) - continue; - item = attr_check_append(check, git_attr(name)); - item->value = value; - } -} - -void attr_start(void) -{ - pthread_mutex_init(&g_attr_hashmap.mutex, NULL); - pthread_mutex_init(&check_vector.mutex, NULL); -} |