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![Joanna Wang](/assets/img/avatar_default.png)
Gives all paths builtin objectmode values based on the paths' modes (one of 100644, 100755, 120000, 040000, 160000). Users may use this feature to filter by file types. For example a pathspec such as ':(attr:builtin_objectmode=160000)' could filter for submodules without needing to have `builtin_objectmode=160000` to be set in .gitattributes for every submodule path. These values are also reflected in `git check-attr` results. If the git_attr_direction is set to GIT_ATTR_INDEX or GIT_ATTR_CHECKIN and a path is not found in the index, the value will be unspecified. This patch also reserves the builtin_* attribute namespace for objectmode and any future builtin attributes. Any user defined attributes using this reserved namespace will result in a warning. This is a breaking change for any existing builtin_* attributes. Pathspecs with some builtin_* attribute name (excluding builtin_objectmode) will behave like any attribute where there are no user specified values. Signed-off-by: Joanna Wang <jojwang@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
1375 lines
34 KiB
C
1375 lines
34 KiB
C
/*
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* Handle git attributes. See gitattributes(5) for a description of
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* the file syntax, and attr.h for a description of the API.
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*
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* One basic design decision here is that we are not going to support
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* an insanely large number of attributes.
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*/
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#include "git-compat-util.h"
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#include "config.h"
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#include "environment.h"
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#include "exec-cmd.h"
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#include "attr.h"
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#include "dir.h"
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#include "gettext.h"
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#include "path.h"
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#include "utf8.h"
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#include "quote.h"
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#include "read-cache-ll.h"
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#include "refs.h"
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#include "revision.h"
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#include "object-store-ll.h"
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#include "setup.h"
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#include "thread-utils.h"
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#include "tree-walk.h"
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#include "object-name.h"
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const char *git_attr_tree;
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const char git_attr__true[] = "(builtin)true";
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const char git_attr__false[] = "\0(builtin)false";
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static const char git_attr__unknown[] = "(builtin)unknown";
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#define ATTR__TRUE git_attr__true
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#define ATTR__FALSE git_attr__false
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#define ATTR__UNSET NULL
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#define ATTR__UNKNOWN git_attr__unknown
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struct git_attr {
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unsigned int attr_nr; /* unique attribute number */
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char name[FLEX_ARRAY]; /* attribute name */
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};
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const char *git_attr_name(const struct git_attr *attr)
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{
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return attr->name;
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}
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struct attr_hashmap {
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struct hashmap map;
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pthread_mutex_t mutex;
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};
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static inline void hashmap_lock(struct attr_hashmap *map)
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{
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pthread_mutex_lock(&map->mutex);
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}
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static inline void hashmap_unlock(struct attr_hashmap *map)
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{
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pthread_mutex_unlock(&map->mutex);
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}
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/* The container for objects stored in "struct attr_hashmap" */
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struct attr_hash_entry {
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struct hashmap_entry ent;
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const char *key; /* the key; memory should be owned by value */
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size_t keylen; /* length of the key */
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void *value; /* the stored value */
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};
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/* attr_hashmap comparison function */
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static int attr_hash_entry_cmp(const void *cmp_data UNUSED,
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const struct hashmap_entry *eptr,
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const struct hashmap_entry *entry_or_key,
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const void *keydata UNUSED)
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{
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const struct attr_hash_entry *a, *b;
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a = container_of(eptr, const struct attr_hash_entry, ent);
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b = container_of(entry_or_key, const struct attr_hash_entry, ent);
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return (a->keylen != b->keylen) || strncmp(a->key, b->key, a->keylen);
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}
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/*
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* The global dictionary of all interned attributes. This
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* is a singleton object which is shared between threads.
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* Access to this dictionary must be surrounded with a mutex.
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*/
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static struct attr_hashmap g_attr_hashmap = {
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.map = HASHMAP_INIT(attr_hash_entry_cmp, NULL),
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};
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/*
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* Retrieve the 'value' stored in a hashmap given the provided 'key'.
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* If there is no matching entry, return NULL.
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*/
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static void *attr_hashmap_get(struct attr_hashmap *map,
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const char *key, size_t keylen)
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{
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struct attr_hash_entry k;
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struct attr_hash_entry *e;
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hashmap_entry_init(&k.ent, memhash(key, keylen));
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k.key = key;
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k.keylen = keylen;
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e = hashmap_get_entry(&map->map, &k, ent, NULL);
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return e ? e->value : NULL;
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}
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/* Add 'value' to a hashmap based on the provided 'key'. */
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static void attr_hashmap_add(struct attr_hashmap *map,
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const char *key, size_t keylen,
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void *value)
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{
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struct attr_hash_entry *e;
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e = xmalloc(sizeof(struct attr_hash_entry));
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hashmap_entry_init(&e->ent, memhash(key, keylen));
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e->key = key;
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e->keylen = keylen;
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e->value = value;
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hashmap_add(&map->map, &e->ent);
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}
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struct all_attrs_item {
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const struct git_attr *attr;
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const char *value;
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/*
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* If 'macro' is non-NULL, indicates that 'attr' is a macro based on
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* the current attribute stack and contains a pointer to the match_attr
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* definition of the macro
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*/
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const struct match_attr *macro;
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};
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/*
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* Reallocate and reinitialize the array of all attributes (which is used in
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* the attribute collection process) in 'check' based on the global dictionary
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* of attributes.
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*/
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static void all_attrs_init(struct attr_hashmap *map, struct attr_check *check)
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{
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int i;
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unsigned int size;
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hashmap_lock(map);
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size = hashmap_get_size(&map->map);
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if (size < check->all_attrs_nr)
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BUG("interned attributes shouldn't be deleted");
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/*
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* If the number of attributes in the global dictionary has increased
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* (or this attr_check instance doesn't have an initialized all_attrs
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* field), reallocate the provided attr_check instance's all_attrs
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* field and fill each entry with its corresponding git_attr.
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*/
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if (size != check->all_attrs_nr) {
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struct attr_hash_entry *e;
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struct hashmap_iter iter;
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REALLOC_ARRAY(check->all_attrs, size);
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check->all_attrs_nr = size;
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hashmap_for_each_entry(&map->map, &iter, e,
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ent /* member name */) {
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const struct git_attr *a = e->value;
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check->all_attrs[a->attr_nr].attr = a;
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}
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}
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hashmap_unlock(map);
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/*
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* Re-initialize every entry in check->all_attrs.
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* This re-initialization can live outside of the locked region since
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* the attribute dictionary is no longer being accessed.
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*/
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for (i = 0; i < check->all_attrs_nr; i++) {
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check->all_attrs[i].value = ATTR__UNKNOWN;
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check->all_attrs[i].macro = NULL;
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}
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}
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/*
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* Atribute name cannot begin with "builtin_" which
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* is a reserved namespace for built in attributes values.
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*/
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static int attr_name_reserved(const char *name)
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{
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return starts_with(name, "builtin_");
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}
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static int attr_name_valid(const char *name, size_t namelen)
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{
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/*
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* Attribute name cannot begin with '-' and must consist of
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* characters from [-A-Za-z0-9_.].
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*/
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if (namelen <= 0 || *name == '-')
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return 0;
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while (namelen--) {
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char ch = *name++;
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if (! (ch == '-' || ch == '.' || ch == '_' ||
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('0' <= ch && ch <= '9') ||
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('a' <= ch && ch <= 'z') ||
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('A' <= ch && ch <= 'Z')) )
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return 0;
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}
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return 1;
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}
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static void report_invalid_attr(const char *name, size_t len,
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const char *src, int lineno)
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{
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struct strbuf err = STRBUF_INIT;
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strbuf_addf(&err, _("%.*s is not a valid attribute name"),
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(int) len, name);
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fprintf(stderr, "%s: %s:%d\n", err.buf, src, lineno);
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strbuf_release(&err);
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}
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/*
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* Given a 'name', lookup and return the corresponding attribute in the global
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* dictionary. If no entry is found, create a new attribute and store it in
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* the dictionary.
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*/
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static const struct git_attr *git_attr_internal(const char *name, size_t namelen)
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{
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struct git_attr *a;
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if (!attr_name_valid(name, namelen))
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return NULL;
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hashmap_lock(&g_attr_hashmap);
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a = attr_hashmap_get(&g_attr_hashmap, name, namelen);
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if (!a) {
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FLEX_ALLOC_MEM(a, name, name, namelen);
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a->attr_nr = hashmap_get_size(&g_attr_hashmap.map);
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attr_hashmap_add(&g_attr_hashmap, a->name, namelen, a);
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if (a->attr_nr != hashmap_get_size(&g_attr_hashmap.map) - 1)
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die(_("unable to add additional attribute"));
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}
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hashmap_unlock(&g_attr_hashmap);
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return a;
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}
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const struct git_attr *git_attr(const char *name)
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{
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return git_attr_internal(name, strlen(name));
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}
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/* What does a matched pattern decide? */
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struct attr_state {
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const struct git_attr *attr;
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const char *setto;
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};
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struct pattern {
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const char *pattern;
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int patternlen;
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int nowildcardlen;
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unsigned flags; /* PATTERN_FLAG_* */
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};
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/*
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* One rule, as from a .gitattributes file.
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*
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* If is_macro is true, then u.attr is a pointer to the git_attr being
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* defined.
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*
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* If is_macro is false, then u.pat is the filename pattern to which the
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* rule applies.
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*
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* In either case, num_attr is the number of attributes affected by
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* this rule, and state is an array listing them. The attributes are
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* listed as they appear in the file (macros unexpanded).
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*/
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struct match_attr {
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union {
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struct pattern pat;
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const struct git_attr *attr;
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} u;
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char is_macro;
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size_t num_attr;
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struct attr_state state[FLEX_ARRAY];
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};
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static const char blank[] = " \t\r\n";
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/* Flags usable in read_attr() and parse_attr_line() family of functions. */
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#define READ_ATTR_MACRO_OK (1<<0)
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#define READ_ATTR_NOFOLLOW (1<<1)
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/*
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* Parse a whitespace-delimited attribute state (i.e., "attr",
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* "-attr", "!attr", or "attr=value") from the string starting at src.
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* If e is not NULL, write the results to *e. Return a pointer to the
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* remainder of the string (with leading whitespace removed), or NULL
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* if there was an error.
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*/
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static const char *parse_attr(const char *src, int lineno, const char *cp,
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struct attr_state *e)
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{
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const char *ep, *equals;
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size_t len;
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ep = cp + strcspn(cp, blank);
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equals = strchr(cp, '=');
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if (equals && ep < equals)
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equals = NULL;
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if (equals)
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len = equals - cp;
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else
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len = ep - cp;
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if (!e) {
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if (*cp == '-' || *cp == '!') {
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cp++;
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len--;
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}
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if (!attr_name_valid(cp, len) || attr_name_reserved(cp)) {
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report_invalid_attr(cp, len, src, lineno);
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return NULL;
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}
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} else {
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/*
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* As this function is always called twice, once with
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* e == NULL in the first pass and then e != NULL in
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* the second pass, no need for attr_name_valid()
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* check here.
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*/
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if (*cp == '-' || *cp == '!') {
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e->setto = (*cp == '-') ? ATTR__FALSE : ATTR__UNSET;
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cp++;
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len--;
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}
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else if (!equals)
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e->setto = ATTR__TRUE;
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else {
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e->setto = xmemdupz(equals + 1, ep - equals - 1);
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}
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e->attr = git_attr_internal(cp, len);
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}
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return ep + strspn(ep, blank);
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}
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static struct match_attr *parse_attr_line(const char *line, const char *src,
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int lineno, unsigned flags)
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{
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size_t namelen, num_attr, i;
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const char *cp, *name, *states;
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struct match_attr *res = NULL;
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int is_macro;
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struct strbuf pattern = STRBUF_INIT;
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cp = line + strspn(line, blank);
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if (!*cp || *cp == '#')
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return NULL;
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name = cp;
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if (strlen(line) >= ATTR_MAX_LINE_LENGTH) {
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warning(_("ignoring overly long attributes line %d"), lineno);
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return NULL;
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}
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if (*cp == '"' && !unquote_c_style(&pattern, name, &states)) {
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name = pattern.buf;
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namelen = pattern.len;
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} else {
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namelen = strcspn(name, blank);
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states = name + namelen;
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}
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if (strlen(ATTRIBUTE_MACRO_PREFIX) < namelen &&
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starts_with(name, ATTRIBUTE_MACRO_PREFIX)) {
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if (!(flags & READ_ATTR_MACRO_OK)) {
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fprintf_ln(stderr, _("%s not allowed: %s:%d"),
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name, src, lineno);
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goto fail_return;
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}
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is_macro = 1;
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name += strlen(ATTRIBUTE_MACRO_PREFIX);
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name += strspn(name, blank);
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namelen = strcspn(name, blank);
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if (!attr_name_valid(name, namelen) || attr_name_reserved(name)) {
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report_invalid_attr(name, namelen, src, lineno);
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goto fail_return;
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}
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}
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else
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is_macro = 0;
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states += strspn(states, blank);
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/* First pass to count the attr_states */
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for (cp = states, num_attr = 0; *cp; num_attr++) {
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cp = parse_attr(src, lineno, cp, NULL);
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if (!cp)
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goto fail_return;
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}
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res = xcalloc(1, st_add3(sizeof(*res),
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st_mult(sizeof(struct attr_state), num_attr),
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is_macro ? 0 : namelen + 1));
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if (is_macro) {
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res->u.attr = git_attr_internal(name, namelen);
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} else {
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char *p = (char *)&(res->state[num_attr]);
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memcpy(p, name, namelen);
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res->u.pat.pattern = p;
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parse_path_pattern(&res->u.pat.pattern,
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&res->u.pat.patternlen,
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&res->u.pat.flags,
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&res->u.pat.nowildcardlen);
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if (res->u.pat.flags & PATTERN_FLAG_NEGATIVE) {
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warning(_("Negative patterns are ignored in git attributes\n"
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"Use '\\!' for literal leading exclamation."));
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goto fail_return;
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}
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}
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res->is_macro = is_macro;
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res->num_attr = num_attr;
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/* Second pass to fill the attr_states */
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for (cp = states, i = 0; *cp; i++) {
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cp = parse_attr(src, lineno, cp, &(res->state[i]));
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}
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strbuf_release(&pattern);
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return res;
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fail_return:
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strbuf_release(&pattern);
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free(res);
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return NULL;
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}
|
|
|
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/*
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* Like info/exclude and .gitignore, the attribute information can
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* come from many places.
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*
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* (1) .gitattributes file of the same directory;
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* (2) .gitattributes file of the parent directory if (1) does not have
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* any match; this goes recursively upwards, just like .gitignore.
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* (3) $GIT_DIR/info/attributes, which overrides both of the above.
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*
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* In the same file, later entries override the earlier match, so in the
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* global list, we would have entries from info/attributes the earliest
|
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* (reading the file from top to bottom), .gitattributes of the root
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* directory (again, reading the file from top to bottom) down to the
|
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* current directory, and then scan the list backwards to find the first match.
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|
* This is exactly the same as what is_excluded() does in dir.c to deal with
|
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* .gitignore file and info/excludes file as a fallback.
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*/
|
|
|
|
struct attr_stack {
|
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struct attr_stack *prev;
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|
char *origin;
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size_t originlen;
|
|
unsigned num_matches;
|
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unsigned alloc;
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|
struct match_attr **attrs;
|
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};
|
|
|
|
static void attr_stack_free(struct attr_stack *e)
|
|
{
|
|
unsigned i;
|
|
free(e->origin);
|
|
for (i = 0; i < e->num_matches; i++) {
|
|
struct match_attr *a = e->attrs[i];
|
|
size_t 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);
|
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}
|
|
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;
|
|
CALLOC_ARRAY(check->items, cnt);
|
|
|
|
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;
|
|
DUP_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,
|
|
unsigned flags)
|
|
{
|
|
struct match_attr *a;
|
|
|
|
a = parse_attr_line(line, src, lineno, flags);
|
|
if (!a)
|
|
return;
|
|
ALLOC_GROW_BY(res->attrs, res->num_matches, 1, res->alloc);
|
|
res->attrs[res->num_matches - 1] = a;
|
|
}
|
|
|
|
static struct attr_stack *read_attr_from_array(const char **list)
|
|
{
|
|
struct attr_stack *res;
|
|
const char *line;
|
|
int lineno = 0;
|
|
|
|
CALLOC_ARRAY(res, 1);
|
|
while ((line = *(list++)) != NULL)
|
|
handle_attr_line(res, line, "[builtin]", ++lineno,
|
|
READ_ATTR_MACRO_OK);
|
|
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 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, unsigned flags)
|
|
{
|
|
struct strbuf buf = STRBUF_INIT;
|
|
int fd;
|
|
FILE *fp;
|
|
struct attr_stack *res;
|
|
int lineno = 0;
|
|
struct stat st;
|
|
|
|
if (flags & READ_ATTR_NOFOLLOW)
|
|
fd = open_nofollow(path, O_RDONLY);
|
|
else
|
|
fd = open(path, O_RDONLY);
|
|
|
|
if (fd < 0) {
|
|
warn_on_fopen_errors(path);
|
|
return NULL;
|
|
}
|
|
fp = xfdopen(fd, "r");
|
|
if (fstat(fd, &st)) {
|
|
warning_errno(_("cannot fstat gitattributes file '%s'"), path);
|
|
fclose(fp);
|
|
return NULL;
|
|
}
|
|
if (st.st_size >= ATTR_MAX_FILE_SIZE) {
|
|
warning(_("ignoring overly large gitattributes file '%s'"), path);
|
|
fclose(fp);
|
|
return NULL;
|
|
}
|
|
|
|
CALLOC_ARRAY(res, 1);
|
|
while (strbuf_getline(&buf, fp) != EOF) {
|
|
if (!lineno && starts_with(buf.buf, utf8_bom))
|
|
strbuf_remove(&buf, 0, strlen(utf8_bom));
|
|
handle_attr_line(res, buf.buf, path, ++lineno, flags);
|
|
}
|
|
|
|
fclose(fp);
|
|
strbuf_release(&buf);
|
|
return res;
|
|
}
|
|
|
|
static struct attr_stack *read_attr_from_buf(char *buf, const char *path,
|
|
unsigned flags)
|
|
{
|
|
struct attr_stack *res;
|
|
char *sp;
|
|
int lineno = 0;
|
|
|
|
if (!buf)
|
|
return NULL;
|
|
|
|
CALLOC_ARRAY(res, 1);
|
|
for (sp = buf; *sp;) {
|
|
char *ep;
|
|
int more;
|
|
|
|
ep = strchrnul(sp, '\n');
|
|
more = (*ep == '\n');
|
|
*ep = '\0';
|
|
handle_attr_line(res, sp, path, ++lineno, flags);
|
|
sp = ep + more;
|
|
}
|
|
free(buf);
|
|
|
|
return res;
|
|
}
|
|
|
|
static struct attr_stack *read_attr_from_blob(struct index_state *istate,
|
|
const struct object_id *tree_oid,
|
|
const char *path, unsigned flags)
|
|
{
|
|
struct object_id oid;
|
|
unsigned long sz;
|
|
enum object_type type;
|
|
void *buf;
|
|
unsigned short mode;
|
|
|
|
if (!tree_oid)
|
|
return NULL;
|
|
|
|
if (get_tree_entry(istate->repo, tree_oid, path, &oid, &mode))
|
|
return NULL;
|
|
|
|
buf = repo_read_object_file(istate->repo, &oid, &type, &sz);
|
|
if (!buf || type != OBJ_BLOB) {
|
|
free(buf);
|
|
return NULL;
|
|
}
|
|
|
|
return read_attr_from_buf(buf, path, flags);
|
|
}
|
|
|
|
static struct attr_stack *read_attr_from_index(struct index_state *istate,
|
|
const char *path, unsigned flags)
|
|
{
|
|
struct attr_stack *stack = NULL;
|
|
char *buf;
|
|
unsigned long size;
|
|
int sparse_dir_pos = -1;
|
|
|
|
if (!istate)
|
|
return NULL;
|
|
|
|
/*
|
|
* When handling sparse-checkouts, .gitattributes files
|
|
* may reside within a sparse directory. We distinguish
|
|
* whether a path exists directly in the index or not by
|
|
* evaluating if 'pos' is negative.
|
|
* If 'pos' is negative, the path is not directly present
|
|
* in the index and is likely within a sparse directory.
|
|
* For paths not in the index, The absolute value of 'pos'
|
|
* minus 1 gives us the position where the path would be
|
|
* inserted in lexicographic order within the index.
|
|
* We then subtract another 1 from this value
|
|
* (sparse_dir_pos = -pos - 2) to find the position of the
|
|
* last index entry which is lexicographically smaller than
|
|
* the path. This would be the sparse directory containing
|
|
* the path. By identifying the sparse directory containing
|
|
* the path, we can correctly read the attributes specified
|
|
* in the .gitattributes file from the tree object of the
|
|
* sparse directory.
|
|
*/
|
|
if (!path_in_cone_mode_sparse_checkout(path, istate)) {
|
|
int pos = index_name_pos_sparse(istate, path, strlen(path));
|
|
|
|
if (pos < 0)
|
|
sparse_dir_pos = -pos - 2;
|
|
}
|
|
|
|
if (sparse_dir_pos >= 0 &&
|
|
S_ISSPARSEDIR(istate->cache[sparse_dir_pos]->ce_mode) &&
|
|
!strncmp(istate->cache[sparse_dir_pos]->name, path, ce_namelen(istate->cache[sparse_dir_pos]))) {
|
|
const char *relative_path = path + ce_namelen(istate->cache[sparse_dir_pos]);
|
|
stack = read_attr_from_blob(istate, &istate->cache[sparse_dir_pos]->oid, relative_path, flags);
|
|
} else {
|
|
buf = read_blob_data_from_index(istate, path, &size);
|
|
if (!buf)
|
|
return NULL;
|
|
if (size >= ATTR_MAX_FILE_SIZE) {
|
|
warning(_("ignoring overly large gitattributes blob '%s'"), path);
|
|
return NULL;
|
|
}
|
|
stack = read_attr_from_buf(buf, path, flags);
|
|
}
|
|
return stack;
|
|
}
|
|
|
|
static struct attr_stack *read_attr(struct index_state *istate,
|
|
const struct object_id *tree_oid,
|
|
const char *path, unsigned flags)
|
|
{
|
|
struct attr_stack *res = NULL;
|
|
|
|
if (direction == GIT_ATTR_INDEX) {
|
|
res = read_attr_from_index(istate, path, flags);
|
|
} else if (tree_oid) {
|
|
res = read_attr_from_blob(istate, tree_oid, path, flags);
|
|
} else if (!is_bare_repository()) {
|
|
if (direction == GIT_ATTR_CHECKOUT) {
|
|
res = read_attr_from_index(istate, path, flags);
|
|
if (!res)
|
|
res = read_attr_from_file(path, flags);
|
|
} else if (direction == GIT_ATTR_CHECKIN) {
|
|
res = read_attr_from_file(path, flags);
|
|
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, flags);
|
|
}
|
|
}
|
|
|
|
if (!res)
|
|
CALLOC_ARRAY(res, 1);
|
|
return res;
|
|
}
|
|
|
|
const char *git_attr_system_file(void)
|
|
{
|
|
static const char *system_wide;
|
|
if (!system_wide)
|
|
system_wide = system_path(ETC_GITATTRIBUTES);
|
|
return system_wide;
|
|
}
|
|
|
|
const char *git_attr_global_file(void)
|
|
{
|
|
if (!git_attributes_file)
|
|
git_attributes_file = xdg_config_home("attributes");
|
|
|
|
return git_attributes_file;
|
|
}
|
|
|
|
int git_attr_system_is_enabled(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(struct index_state *istate,
|
|
const struct object_id *tree_oid,
|
|
struct attr_stack **stack)
|
|
{
|
|
struct attr_stack *e;
|
|
unsigned flags = READ_ATTR_MACRO_OK;
|
|
|
|
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_is_enabled()) {
|
|
e = read_attr_from_file(git_attr_system_file(), flags);
|
|
push_stack(stack, e, NULL, 0);
|
|
}
|
|
|
|
/* home directory */
|
|
if (git_attr_global_file()) {
|
|
e = read_attr_from_file(git_attr_global_file(), flags);
|
|
push_stack(stack, e, NULL, 0);
|
|
}
|
|
|
|
/* root directory */
|
|
e = read_attr(istate, tree_oid, GITATTRIBUTES_FILE, flags | READ_ATTR_NOFOLLOW);
|
|
push_stack(stack, e, xstrdup(""), 0);
|
|
|
|
/* info frame */
|
|
if (startup_info->have_repository)
|
|
e = read_attr_from_file(git_path_info_attributes(), flags);
|
|
else
|
|
e = NULL;
|
|
if (!e)
|
|
CALLOC_ARRAY(e, 1);
|
|
push_stack(stack, e, NULL, 0);
|
|
}
|
|
|
|
static void prepare_attr_stack(struct index_state *istate,
|
|
const struct object_id *tree_oid,
|
|
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, tree_oid, 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;
|
|
|
|
*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, tree_oid, pathbuf.buf, READ_ATTR_NOFOLLOW);
|
|
|
|
/* 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 & PATTERN_FLAG_MUSTBEDIR) && !isdir)
|
|
return 0;
|
|
|
|
if (pat->flags & PATTERN_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);
|
|
}
|
|
|
|
static int macroexpand_one(struct all_attrs_item *all_attrs, int nr, int rem);
|
|
|
|
static int fill_one(struct all_attrs_item *all_attrs,
|
|
const struct match_attr *a, int rem)
|
|
{
|
|
size_t i;
|
|
|
|
for (i = a->num_attr; rem > 0 && i > 0; i--) {
|
|
const struct git_attr *attr = a->state[i - 1].attr;
|
|
const char **n = &(all_attrs[attr->attr_nr].value);
|
|
const char *v = a->state[i - 1].setto;
|
|
|
|
if (*n == ATTR__UNKNOWN) {
|
|
*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) {
|
|
unsigned i;
|
|
const char *base = stack->origin ? stack->origin : "";
|
|
|
|
for (i = stack->num_matches; 0 < rem && 0 < i; i--) {
|
|
const struct match_attr *a = stack->attrs[i - 1];
|
|
if (a->is_macro)
|
|
continue;
|
|
if (path_matches(path, pathlen, basename_offset,
|
|
&a->u.pat, base, stack->originlen))
|
|
rem = fill_one(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(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) {
|
|
unsigned i;
|
|
for (i = stack->num_matches; i > 0; i--) {
|
|
const struct match_attr *ma = stack->attrs[i - 1];
|
|
if (ma->is_macro) {
|
|
unsigned 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(struct index_state *istate,
|
|
const struct object_id *tree_oid,
|
|
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, tree_oid, 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);
|
|
}
|
|
|
|
static const char *default_attr_source_tree_object_name;
|
|
static int ignore_bad_attr_tree;
|
|
|
|
void set_git_attr_source(const char *tree_object_name)
|
|
{
|
|
default_attr_source_tree_object_name = xstrdup(tree_object_name);
|
|
}
|
|
|
|
static void compute_default_attr_source(struct object_id *attr_source)
|
|
{
|
|
if (!default_attr_source_tree_object_name)
|
|
default_attr_source_tree_object_name = getenv(GIT_ATTR_SOURCE_ENVIRONMENT);
|
|
|
|
if (!default_attr_source_tree_object_name && git_attr_tree) {
|
|
default_attr_source_tree_object_name = git_attr_tree;
|
|
ignore_bad_attr_tree = 1;
|
|
}
|
|
|
|
if (!default_attr_source_tree_object_name &&
|
|
startup_info->have_repository &&
|
|
is_bare_repository()) {
|
|
default_attr_source_tree_object_name = "HEAD";
|
|
ignore_bad_attr_tree = 1;
|
|
}
|
|
|
|
if (!default_attr_source_tree_object_name || !is_null_oid(attr_source))
|
|
return;
|
|
|
|
if (repo_get_oid_treeish(the_repository,
|
|
default_attr_source_tree_object_name,
|
|
attr_source) && !ignore_bad_attr_tree)
|
|
die(_("bad --attr-source or GIT_ATTR_SOURCE"));
|
|
}
|
|
|
|
static struct object_id *default_attr_source(void)
|
|
{
|
|
static struct object_id attr_source;
|
|
|
|
if (is_null_oid(&attr_source))
|
|
compute_default_attr_source(&attr_source);
|
|
if (is_null_oid(&attr_source))
|
|
return NULL;
|
|
return &attr_source;
|
|
}
|
|
|
|
static const char *interned_mode_string(unsigned int mode)
|
|
{
|
|
static struct {
|
|
unsigned int val;
|
|
char str[7];
|
|
} mode_string[] = {
|
|
{ .val = 0040000 },
|
|
{ .val = 0100644 },
|
|
{ .val = 0100755 },
|
|
{ .val = 0120000 },
|
|
{ .val = 0160000 },
|
|
};
|
|
int i;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(mode_string); i++) {
|
|
if (mode_string[i].val != mode)
|
|
continue;
|
|
if (!*mode_string[i].str)
|
|
snprintf(mode_string[i].str, sizeof(mode_string[i].str),
|
|
"%06o", mode);
|
|
return mode_string[i].str;
|
|
}
|
|
BUG("Unsupported mode 0%o", mode);
|
|
}
|
|
|
|
static const char *builtin_object_mode_attr(struct index_state *istate, const char *path)
|
|
{
|
|
unsigned int mode;
|
|
|
|
if (direction == GIT_ATTR_CHECKIN) {
|
|
struct object_id oid;
|
|
struct stat st;
|
|
if (lstat(path, &st))
|
|
die_errno(_("unable to stat '%s'"), path);
|
|
mode = canon_mode(st.st_mode);
|
|
if (S_ISDIR(mode)) {
|
|
/*
|
|
*`path` is either a directory or it is a submodule,
|
|
* in which case it is already indexed as submodule
|
|
* or it does not exist in the index yet and we need to
|
|
* check if we can resolve to a ref.
|
|
*/
|
|
int pos = index_name_pos(istate, path, strlen(path));
|
|
if (pos >= 0) {
|
|
if (S_ISGITLINK(istate->cache[pos]->ce_mode))
|
|
mode = istate->cache[pos]->ce_mode;
|
|
} else if (resolve_gitlink_ref(path, "HEAD", &oid) == 0) {
|
|
mode = S_IFGITLINK;
|
|
}
|
|
}
|
|
} else {
|
|
/*
|
|
* For GIT_ATTR_CHECKOUT and GIT_ATTR_INDEX we only check
|
|
* for mode in the index.
|
|
*/
|
|
int pos = index_name_pos(istate, path, strlen(path));
|
|
if (pos >= 0)
|
|
mode = istate->cache[pos]->ce_mode;
|
|
else
|
|
return ATTR__UNSET;
|
|
}
|
|
|
|
return interned_mode_string(mode);
|
|
}
|
|
|
|
|
|
static const char *compute_builtin_attr(struct index_state *istate,
|
|
const char *path,
|
|
const struct git_attr *attr) {
|
|
static const struct git_attr *object_mode_attr;
|
|
|
|
if (!object_mode_attr)
|
|
object_mode_attr = git_attr("builtin_objectmode");
|
|
|
|
if (attr == object_mode_attr)
|
|
return builtin_object_mode_attr(istate, path);
|
|
return ATTR__UNSET;
|
|
}
|
|
|
|
void git_check_attr(struct index_state *istate,
|
|
const char *path,
|
|
struct attr_check *check)
|
|
{
|
|
int i;
|
|
const struct object_id *tree_oid = default_attr_source();
|
|
|
|
collect_some_attrs(istate, tree_oid, path, check);
|
|
|
|
for (i = 0; i < check->nr; i++) {
|
|
unsigned int n = check->items[i].attr->attr_nr;
|
|
const char *value = check->all_attrs[n].value;
|
|
if (value == ATTR__UNKNOWN)
|
|
value = compute_builtin_attr(istate, path, check->all_attrs[n].attr);
|
|
check->items[i].value = value;
|
|
}
|
|
}
|
|
|
|
void git_all_attrs(struct index_state *istate,
|
|
const char *path, struct attr_check *check)
|
|
{
|
|
int i;
|
|
const struct object_id *tree_oid = default_attr_source();
|
|
|
|
attr_check_reset(check);
|
|
collect_some_attrs(istate, tree_oid, 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);
|
|
}
|