/* * 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.ent, 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->ent, 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); }