summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorJonathan Tan <jonathantanmy@google.com>2020-01-02 20:16:30 (GMT)
committerJunio C Hamano <gitster@pobox.com>2020-01-02 20:53:30 (GMT)
commit9c8a294a1ae1335511475db9c0eb8841c0ec9738 (patch)
treef99887554b0027969ab5135f2c48469515e3afdf
parent53a06cf39b756eddfe4a2a34da93e3d04eb7b728 (diff)
downloadgit-9c8a294a1ae1335511475db9c0eb8841c0ec9738.zip
git-9c8a294a1ae1335511475db9c0eb8841c0ec9738.tar.gz
git-9c8a294a1ae1335511475db9c0eb8841c0ec9738.tar.bz2
sha1-file: remove OBJECT_INFO_SKIP_CACHED
In a partial clone, if a user provides the hash of the empty tree ("git mktree </dev/null" - for SHA-1, this is 4b825d...) to a command which requires that that object be parsed, for example: git diff-tree 4b825d <a non-empty tree> then Git will lazily fetch the empty tree, unnecessarily, because parsing of that object invokes repo_has_object_file(), which does not special-case the empty tree. Instead, teach repo_has_object_file() to consult find_cached_object() (which handles the empty tree), thus bringing it in line with the rest of the object-store-accessing functions. A cost is that repo_has_object_file() will now need to oideq upon each invocation, but that is trivial compared to the filesystem lookup or the pack index search required anyway. (And if find_cached_object() needs to do more because of previous invocations to pretend_object_file(), all the more reason to be consistent in whether we present cached objects.) As a historical note, the function now known as repo_read_object_file() was taught the empty tree in 346245a1bb ("hard-code the empty tree object", 2008-02-13), and the function now known as oid_object_info() was taught the empty tree in c4d9986f5f ("sha1_object_info: examine cached_object store too", 2011-02-07). repo_has_object_file() was never updated, perhaps due to oversight. The flag OBJECT_INFO_SKIP_CACHED, introduced later in dfdd4afcf9 ("sha1_file: teach sha1_object_info_extended more flags", 2017-06-26) and used in e83e71c5e1 ("sha1_file: refactor has_sha1_file_with_flags", 2017-06-26), was introduced to preserve this difference in empty-tree handling, but now it can be removed. Signed-off-by: Jonathan Tan <jonathantanmy@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
-rw-r--r--object-store.h2
-rw-r--r--sha1-file.c38
2 files changed, 18 insertions, 22 deletions
diff --git a/object-store.h b/object-store.h
index 7f7b3cd..073d64d 100644
--- a/object-store.h
+++ b/object-store.h
@@ -271,8 +271,6 @@ struct object_info {
#define OBJECT_INFO_LOOKUP_REPLACE 1
/* Allow reading from a loose object file of unknown/bogus type */
#define OBJECT_INFO_ALLOW_UNKNOWN_TYPE 2
-/* Do not check cached storage */
-#define OBJECT_INFO_SKIP_CACHED 4
/* Do not retry packed storage after checking packed and loose storage */
#define OBJECT_INFO_QUICK 8
/* Do not check loose object */
diff --git a/sha1-file.c b/sha1-file.c
index 188de57..03ae9ae 100644
--- a/sha1-file.c
+++ b/sha1-file.c
@@ -1417,6 +1417,7 @@ int oid_object_info_extended(struct repository *r, const struct object_id *oid,
struct object_info *oi, unsigned flags)
{
static struct object_info blank_oi = OBJECT_INFO_INIT;
+ struct cached_object *co;
struct pack_entry e;
int rtype;
const struct object_id *real = oid;
@@ -1431,24 +1432,22 @@ int oid_object_info_extended(struct repository *r, const struct object_id *oid,
if (!oi)
oi = &blank_oi;
- if (!(flags & OBJECT_INFO_SKIP_CACHED)) {
- struct cached_object *co = find_cached_object(real);
- if (co) {
- if (oi->typep)
- *(oi->typep) = co->type;
- if (oi->sizep)
- *(oi->sizep) = co->size;
- if (oi->disk_sizep)
- *(oi->disk_sizep) = 0;
- if (oi->delta_base_sha1)
- hashclr(oi->delta_base_sha1);
- if (oi->type_name)
- strbuf_addstr(oi->type_name, type_name(co->type));
- if (oi->contentp)
- *oi->contentp = xmemdupz(co->buf, co->size);
- oi->whence = OI_CACHED;
- return 0;
- }
+ co = find_cached_object(real);
+ if (co) {
+ if (oi->typep)
+ *(oi->typep) = co->type;
+ if (oi->sizep)
+ *(oi->sizep) = co->size;
+ if (oi->disk_sizep)
+ *(oi->disk_sizep) = 0;
+ if (oi->delta_base_sha1)
+ hashclr(oi->delta_base_sha1);
+ if (oi->type_name)
+ strbuf_addstr(oi->type_name, type_name(co->type));
+ if (oi->contentp)
+ *oi->contentp = xmemdupz(co->buf, co->size);
+ oi->whence = OI_CACHED;
+ return 0;
}
while (1) {
@@ -1932,8 +1931,7 @@ int repo_has_object_file_with_flags(struct repository *r,
{
if (!startup_info->have_repository)
return 0;
- return oid_object_info_extended(r, oid, NULL,
- flags | OBJECT_INFO_SKIP_CACHED) >= 0;
+ return oid_object_info_extended(r, oid, NULL, flags) >= 0;
}
int repo_has_object_file(struct repository *r,