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Diffstat (limited to 'sha1-file.c')
-rw-r--r--sha1-file.c291
1 files changed, 185 insertions, 106 deletions
diff --git a/sha1-file.c b/sha1-file.c
index cc95286..c8da9f3 100644
--- a/sha1-file.c
+++ b/sha1-file.c
@@ -40,10 +40,20 @@
#define EMPTY_TREE_SHA1_BIN_LITERAL \
"\x4b\x82\x5d\xc6\x42\xcb\x6e\xb9\xa0\x60" \
"\xe5\x4b\xf8\xd6\x92\x88\xfb\xee\x49\x04"
+#define EMPTY_TREE_SHA256_BIN_LITERAL \
+ "\x6e\xf1\x9b\x41\x22\x5c\x53\x69\xf1\xc1" \
+ "\x04\xd4\x5d\x8d\x85\xef\xa9\xb0\x57\xb5" \
+ "\x3b\x14\xb4\xb9\xb9\x39\xdd\x74\xde\xcc" \
+ "\x53\x21"
#define EMPTY_BLOB_SHA1_BIN_LITERAL \
"\xe6\x9d\xe2\x9b\xb2\xd1\xd6\x43\x4b\x8b" \
"\x29\xae\x77\x5a\xd8\xc2\xe4\x8c\x53\x91"
+#define EMPTY_BLOB_SHA256_BIN_LITERAL \
+ "\x47\x3a\x0f\x4c\x3b\xe8\xa9\x36\x81\xa2" \
+ "\x67\xe3\xb1\xe9\xa7\xdc\xda\x11\x85\x43" \
+ "\x6f\xe1\x41\xf7\x74\x91\x20\xa3\x03\x72" \
+ "\x18\x13"
const unsigned char null_sha1[GIT_MAX_RAWSZ];
const struct object_id null_oid;
@@ -53,6 +63,12 @@ static const struct object_id empty_tree_oid = {
static const struct object_id empty_blob_oid = {
EMPTY_BLOB_SHA1_BIN_LITERAL
};
+static const struct object_id empty_tree_oid_sha256 = {
+ EMPTY_TREE_SHA256_BIN_LITERAL
+};
+static const struct object_id empty_blob_oid_sha256 = {
+ EMPTY_BLOB_SHA256_BIN_LITERAL
+};
static void git_hash_sha1_init(git_hash_ctx *ctx)
{
@@ -69,6 +85,22 @@ static void git_hash_sha1_final(unsigned char *hash, git_hash_ctx *ctx)
git_SHA1_Final(hash, &ctx->sha1);
}
+
+static void git_hash_sha256_init(git_hash_ctx *ctx)
+{
+ git_SHA256_Init(&ctx->sha256);
+}
+
+static void git_hash_sha256_update(git_hash_ctx *ctx, const void *data, size_t len)
+{
+ git_SHA256_Update(&ctx->sha256, data, len);
+}
+
+static void git_hash_sha256_final(unsigned char *hash, git_hash_ctx *ctx)
+{
+ git_SHA256_Final(hash, &ctx->sha256);
+}
+
static void git_hash_unknown_init(git_hash_ctx *ctx)
{
BUG("trying to init unknown hash");
@@ -90,6 +122,7 @@ const struct git_hash_algo hash_algos[GIT_HASH_NALGOS] = {
0x00000000,
0,
0,
+ 0,
git_hash_unknown_init,
git_hash_unknown_update,
git_hash_unknown_final,
@@ -97,17 +130,31 @@ const struct git_hash_algo hash_algos[GIT_HASH_NALGOS] = {
NULL,
},
{
- "sha-1",
+ "sha1",
/* "sha1", big-endian */
0x73686131,
GIT_SHA1_RAWSZ,
GIT_SHA1_HEXSZ,
+ GIT_SHA1_BLKSZ,
git_hash_sha1_init,
git_hash_sha1_update,
git_hash_sha1_final,
&empty_tree_oid,
&empty_blob_oid,
},
+ {
+ "sha256",
+ /* "s256", big-endian */
+ 0x73323536,
+ GIT_SHA256_RAWSZ,
+ GIT_SHA256_HEXSZ,
+ GIT_SHA256_BLKSZ,
+ git_hash_sha256_init,
+ git_hash_sha256_update,
+ git_hash_sha256_final,
+ &empty_tree_oid_sha256,
+ &empty_blob_oid_sha256,
+ }
};
const char *empty_tree_oid_hex(void)
@@ -122,6 +169,27 @@ const char *empty_blob_oid_hex(void)
return oid_to_hex_r(buf, the_hash_algo->empty_blob);
}
+int hash_algo_by_name(const char *name)
+{
+ int i;
+ if (!name)
+ return GIT_HASH_UNKNOWN;
+ for (i = 1; i < GIT_HASH_NALGOS; i++)
+ if (!strcmp(name, hash_algos[i].name))
+ return i;
+ return GIT_HASH_UNKNOWN;
+}
+
+int hash_algo_by_id(uint32_t format_id)
+{
+ int i;
+ for (i = 1; i < GIT_HASH_NALGOS; i++)
+ if (format_id == hash_algos[i].format_id)
+ return i;
+ return GIT_HASH_UNKNOWN;
+}
+
+
/*
* This is meant to hold a *small* number of objects that you would
* want read_sha1_file() to be able to return, but yet you do not want
@@ -346,25 +414,21 @@ static void fill_sha1_path(struct strbuf *buf, const unsigned char *sha1)
}
}
-void sha1_file_name(struct repository *r, struct strbuf *buf, const unsigned char *sha1)
+static const char *odb_loose_path(struct object_directory *odb,
+ struct strbuf *buf,
+ const unsigned char *sha1)
{
- strbuf_addstr(buf, r->objects->objectdir);
+ strbuf_reset(buf);
+ strbuf_addstr(buf, odb->path);
strbuf_addch(buf, '/');
fill_sha1_path(buf, sha1);
+ return buf->buf;
}
-struct strbuf *alt_scratch_buf(struct alternate_object_database *alt)
+const char *loose_object_path(struct repository *r, struct strbuf *buf,
+ const unsigned char *sha1)
{
- strbuf_setlen(&alt->scratch, alt->base_len);
- return &alt->scratch;
-}
-
-static const char *alt_sha1_path(struct alternate_object_database *alt,
- const unsigned char *sha1)
-{
- struct strbuf *buf = alt_scratch_buf(alt);
- fill_sha1_path(buf, sha1);
- return buf->buf;
+ return odb_loose_path(r->objects->odb, buf, sha1);
}
/*
@@ -374,7 +438,7 @@ static int alt_odb_usable(struct raw_object_store *o,
struct strbuf *path,
const char *normalized_objdir)
{
- struct alternate_object_database *alt;
+ struct object_directory *odb;
/* Detect cases where alternate disappeared */
if (!is_directory(path->buf)) {
@@ -388,8 +452,8 @@ static int alt_odb_usable(struct raw_object_store *o,
* Prevent the common mistake of listing the same
* thing twice, or object directory itself.
*/
- for (alt = o->alt_odb_list; alt; alt = alt->next) {
- if (!fspathcmp(path->buf, alt->path))
+ for (odb = o->odb; odb; odb = odb->next) {
+ if (!fspathcmp(path->buf, odb->path))
return 0;
}
if (!fspathcmp(path->buf, normalized_objdir))
@@ -402,7 +466,7 @@ static int alt_odb_usable(struct raw_object_store *o,
* Prepare alternate object database registry.
*
* The variable alt_odb_list points at the list of struct
- * alternate_object_database. The elements on this list come from
+ * object_directory. The elements on this list come from
* non-empty elements from colon separated ALTERNATE_DB_ENVIRONMENT
* environment variable, and $GIT_OBJECT_DIRECTORY/info/alternates,
* whose contents is similar to that environment variable but can be
@@ -419,7 +483,7 @@ static void read_info_alternates(struct repository *r,
static int link_alt_odb_entry(struct repository *r, const char *entry,
const char *relative_base, int depth, const char *normalized_objdir)
{
- struct alternate_object_database *ent;
+ struct object_directory *ent;
struct strbuf pathbuf = STRBUF_INIT;
if (!is_absolute_path(entry) && relative_base) {
@@ -447,11 +511,12 @@ static int link_alt_odb_entry(struct repository *r, const char *entry,
return -1;
}
- ent = alloc_alt_odb(pathbuf.buf);
+ ent = xcalloc(1, sizeof(*ent));
+ ent->path = xstrdup(pathbuf.buf);
/* add the alternate entry */
- *r->objects->alt_odb_tail = ent;
- r->objects->alt_odb_tail = &(ent->next);
+ *r->objects->odb_tail = ent;
+ r->objects->odb_tail = &(ent->next);
ent->next = NULL;
/* recursively add alternates */
@@ -505,7 +570,7 @@ static void link_alt_odb_entries(struct repository *r, const char *alt,
return;
}
- strbuf_add_absolute_path(&objdirbuf, r->objects->objectdir);
+ strbuf_add_absolute_path(&objdirbuf, r->objects->odb->path);
if (strbuf_normalize_path(&objdirbuf) < 0)
die(_("unable to normalize object directory: %s"),
objdirbuf.buf);
@@ -540,18 +605,6 @@ static void read_info_alternates(struct repository *r,
free(path);
}
-struct alternate_object_database *alloc_alt_odb(const char *dir)
-{
- struct alternate_object_database *ent;
-
- FLEX_ALLOC_STR(ent, path, dir);
- strbuf_init(&ent->scratch, 0);
- strbuf_addf(&ent->scratch, "%s/", dir);
- ent->base_len = ent->scratch.len;
-
- return ent;
-}
-
void add_to_alternates_file(const char *reference)
{
struct lock_file lock = LOCK_INIT;
@@ -588,7 +641,7 @@ void add_to_alternates_file(const char *reference)
fprintf_or_die(out, "%s\n", reference);
if (commit_lock_file(&lock))
die_errno(_("unable to move new alternates file into place"));
- if (the_repository->objects->alt_odb_tail)
+ if (the_repository->objects->loaded_alternates)
link_alt_odb_entries(the_repository, reference,
'\n', NULL, 0);
}
@@ -684,11 +737,11 @@ out:
int foreach_alt_odb(alt_odb_fn fn, void *cb)
{
- struct alternate_object_database *ent;
+ struct object_directory *ent;
int r = 0;
prepare_alt_odb(the_repository);
- for (ent = the_repository->objects->alt_odb_list; ent; ent = ent->next) {
+ for (ent = the_repository->objects->odb->next; ent; ent = ent->next) {
r = fn(ent, cb);
if (r)
break;
@@ -698,13 +751,13 @@ int foreach_alt_odb(alt_odb_fn fn, void *cb)
void prepare_alt_odb(struct repository *r)
{
- if (r->objects->alt_odb_tail)
+ if (r->objects->loaded_alternates)
return;
- r->objects->alt_odb_tail = &r->objects->alt_odb_list;
link_alt_odb_entries(r, r->objects->alternate_db, PATH_SEP, NULL, 0);
- read_info_alternates(r, r->objects->objectdir, 0);
+ read_info_alternates(r, r->objects->odb->path, 0);
+ r->objects->loaded_alternates = 1;
}
/* Returns 1 if we have successfully freshened the file, 0 otherwise. */
@@ -731,23 +784,27 @@ int check_and_freshen_file(const char *fn, int freshen)
return 1;
}
-static int check_and_freshen_local(const struct object_id *oid, int freshen)
+static int check_and_freshen_odb(struct object_directory *odb,
+ const struct object_id *oid,
+ int freshen)
{
- static struct strbuf buf = STRBUF_INIT;
-
- strbuf_reset(&buf);
- sha1_file_name(the_repository, &buf, oid->hash);
+ static struct strbuf path = STRBUF_INIT;
+ odb_loose_path(odb, &path, oid->hash);
+ return check_and_freshen_file(path.buf, freshen);
+}
- return check_and_freshen_file(buf.buf, freshen);
+static int check_and_freshen_local(const struct object_id *oid, int freshen)
+{
+ return check_and_freshen_odb(the_repository->objects->odb, oid, freshen);
}
static int check_and_freshen_nonlocal(const struct object_id *oid, int freshen)
{
- struct alternate_object_database *alt;
+ struct object_directory *odb;
+
prepare_alt_odb(the_repository);
- for (alt = the_repository->objects->alt_odb_list; alt; alt = alt->next) {
- const char *path = alt_sha1_path(alt, oid->hash);
- if (check_and_freshen_file(path, freshen))
+ for (odb = the_repository->objects->odb->next; odb; odb = odb->next) {
+ if (check_and_freshen_odb(odb, oid, freshen))
return 1;
}
return 0;
@@ -888,25 +945,17 @@ int git_open_cloexec(const char *name, int flags)
*
* The "path" out-parameter will give the path of the object we found (if any).
* Note that it may point to static storage and is only valid until another
- * call to sha1_file_name(), etc.
+ * call to stat_sha1_file().
*/
static int stat_sha1_file(struct repository *r, const unsigned char *sha1,
struct stat *st, const char **path)
{
- struct alternate_object_database *alt;
+ struct object_directory *odb;
static struct strbuf buf = STRBUF_INIT;
- strbuf_reset(&buf);
- sha1_file_name(r, &buf, sha1);
- *path = buf.buf;
-
- if (!lstat(*path, st))
- return 0;
-
prepare_alt_odb(r);
- errno = ENOENT;
- for (alt = r->objects->alt_odb_list; alt; alt = alt->next) {
- *path = alt_sha1_path(alt, sha1);
+ for (odb = r->objects->odb; odb; odb = odb->next) {
+ *path = odb_loose_path(odb, &buf, sha1);
if (!lstat(*path, st))
return 0;
}
@@ -922,25 +971,17 @@ static int open_sha1_file(struct repository *r,
const unsigned char *sha1, const char **path)
{
int fd;
- struct alternate_object_database *alt;
- int most_interesting_errno;
+ struct object_directory *odb;
+ int most_interesting_errno = ENOENT;
static struct strbuf buf = STRBUF_INIT;
- strbuf_reset(&buf);
- sha1_file_name(r, &buf, sha1);
- *path = buf.buf;
-
- fd = git_open(*path);
- if (fd >= 0)
- return fd;
- most_interesting_errno = errno;
-
prepare_alt_odb(r);
- for (alt = r->objects->alt_odb_list; alt; alt = alt->next) {
- *path = alt_sha1_path(alt, sha1);
+ for (odb = r->objects->odb; odb; odb = odb->next) {
+ *path = odb_loose_path(odb, &buf, sha1);
fd = git_open(*path);
if (fd >= 0)
return fd;
+
if (most_interesting_errno == ENOENT)
most_interesting_errno = errno;
}
@@ -948,6 +989,22 @@ static int open_sha1_file(struct repository *r,
return -1;
}
+static int quick_has_loose(struct repository *r,
+ const unsigned char *sha1)
+{
+ struct object_id oid;
+ struct object_directory *odb;
+
+ hashcpy(oid.hash, sha1);
+
+ prepare_alt_odb(r);
+ for (odb = r->objects->odb; odb; odb = odb->next) {
+ if (oid_array_lookup(odb_loose_cache(odb, &oid), &oid) >= 0)
+ return 1;
+ }
+ return 0;
+}
+
/*
* Map the loose object at "path" if it is not NULL, or the path found by
* searching for a loose object named "sha1".
@@ -971,6 +1028,7 @@ static void *map_sha1_file_1(struct repository *r, const char *path,
if (!*size) {
/* mmap() is forbidden on empty files */
error(_("object file %s is empty"), path);
+ close(fd);
return NULL;
}
map = xmmap(NULL, *size, PROT_READ, MAP_PRIVATE, fd, 0);
@@ -1198,6 +1256,8 @@ static int sha1_loose_object_info(struct repository *r,
if (!oi->typep && !oi->type_name && !oi->sizep && !oi->contentp) {
const char *path;
struct stat st;
+ if (!oi->disk_sizep && (flags & OBJECT_INFO_QUICK))
+ return quick_has_loose(r, sha1) ? 0 : -1;
if (stat_sha1_file(r, sha1, &st, &path) < 0)
return -1;
if (oi->disk_sizep)
@@ -1629,8 +1689,7 @@ static int write_loose_object(const struct object_id *oid, char *hdr,
static struct strbuf tmp_file = STRBUF_INIT;
static struct strbuf filename = STRBUF_INIT;
- strbuf_reset(&filename);
- sha1_file_name(the_repository, &filename, oid->hash);
+ loose_object_path(the_repository, &filename, oid->hash);
fd = create_tmpfile(&tmp_file, filename.buf);
if (fd < 0) {
@@ -2140,43 +2199,63 @@ int for_each_loose_file_in_objdir(const char *path,
return r;
}
-struct loose_alt_odb_data {
- each_loose_object_fn *cb;
- void *data;
-};
+int for_each_loose_object(each_loose_object_fn cb, void *data,
+ enum for_each_object_flags flags)
+{
+ struct object_directory *odb;
+
+ prepare_alt_odb(the_repository);
+ for (odb = the_repository->objects->odb; odb; odb = odb->next) {
+ int r = for_each_loose_file_in_objdir(odb->path, cb, NULL,
+ NULL, data);
+ if (r)
+ return r;
-static int loose_from_alt_odb(struct alternate_object_database *alt,
- void *vdata)
+ if (flags & FOR_EACH_OBJECT_LOCAL_ONLY)
+ break;
+ }
+
+ return 0;
+}
+
+static int append_loose_object(const struct object_id *oid, const char *path,
+ void *data)
{
- struct loose_alt_odb_data *data = vdata;
+ oid_array_append(data, oid);
+ return 0;
+}
+
+struct oid_array *odb_loose_cache(struct object_directory *odb,
+ const struct object_id *oid)
+{
+ int subdir_nr = oid->hash[0];
struct strbuf buf = STRBUF_INIT;
- int r;
- strbuf_addstr(&buf, alt->path);
- r = for_each_loose_file_in_objdir_buf(&buf,
- data->cb, NULL, NULL,
- data->data);
+ if (subdir_nr < 0 ||
+ subdir_nr >= ARRAY_SIZE(odb->loose_objects_subdir_seen))
+ BUG("subdir_nr out of range");
+
+ if (odb->loose_objects_subdir_seen[subdir_nr])
+ return &odb->loose_objects_cache[subdir_nr];
+
+ strbuf_addstr(&buf, odb->path);
+ for_each_file_in_obj_subdir(subdir_nr, &buf,
+ append_loose_object,
+ NULL, NULL,
+ &odb->loose_objects_cache[subdir_nr]);
+ odb->loose_objects_subdir_seen[subdir_nr] = 1;
strbuf_release(&buf);
- return r;
+ return &odb->loose_objects_cache[subdir_nr];
}
-int for_each_loose_object(each_loose_object_fn cb, void *data,
- enum for_each_object_flags flags)
+void odb_clear_loose_cache(struct object_directory *odb)
{
- struct loose_alt_odb_data alt;
- int r;
-
- r = for_each_loose_file_in_objdir(get_object_directory(),
- cb, NULL, NULL, data);
- if (r)
- return r;
-
- if (flags & FOR_EACH_OBJECT_LOCAL_ONLY)
- return 0;
+ int i;
- alt.cb = cb;
- alt.data = data;
- return foreach_alt_odb(loose_from_alt_odb, &alt);
+ for (i = 0; i < ARRAY_SIZE(odb->loose_objects_cache); i++)
+ oid_array_clear(&odb->loose_objects_cache[i]);
+ memset(&odb->loose_objects_subdir_seen, 0,
+ sizeof(odb->loose_objects_subdir_seen));
}
static int check_stream_sha1(git_zstream *stream,