Jonathan Tan <jonathantanmy@xxxxxxxxxx> writes:
> Use read_object() in its place instead. This avoids duplication of code.
>
> This makes force_object_loose() slightly slower (because of a redundant
> check of loose object storage), but only in the error case.
>
> Signed-off-by: Jonathan Tan <jonathantanmy@xxxxxxxxxx>
> ---
> sha1_file.c | 26 +-------------------------
> 1 file changed, 1 insertion(+), 25 deletions(-)
The original code insisted on reading from pack and never from a
loose object, because it knew it would return early when it found a
loose version. Now we allow a loose one to appear in the middle of
force_object_loose() operation and happily read from it when we do
not see a pack entry for the object---presumably because we are
racing with another simultanous repack process, or something?---and
then write it out as a new (and identical) loose object, which would
not do any harm.
So this is not strictly a no-op conversion; I have a gut feeling
that it would make it more robust, not less, in the presence of
another racing repack process, but I haven't really thought through
race scenarios that may make difference in its behaviour.
> diff --git a/sha1_file.c b/sha1_file.c
> index 910109fd9..0f758eabf 100644
> --- a/sha1_file.c
> +++ b/sha1_file.c
> @@ -3062,30 +3062,6 @@ int sha1_object_info(const unsigned char *sha1, unsigned long *sizep)
> return type;
> }
>
> -static void *read_packed_sha1(const unsigned char *sha1,
> - enum object_type *type, unsigned long *size)
> -{
> - struct pack_entry e;
> - void *data;
> -
> - if (!find_pack_entry(sha1, &e))
> - return NULL;
> - data = cache_or_unpack_entry(e.p, e.offset, size, type);
> - if (!data) {
> - /*
> - * We're probably in deep shit, but let's try to fetch
> - * the required object anyway from another pack or loose.
> - * This should happen only in the presence of a corrupted
> - * pack, and is better than failing outright.
> - */
> - error("failed to read object %s at offset %"PRIuMAX" from %s",
> - sha1_to_hex(sha1), (uintmax_t)e.offset, e.p->pack_name);
> - mark_bad_packed_object(e.p, sha1);
> - data = read_object(sha1, type, size);
> - }
> - return data;
> -}
> -
> int pretend_sha1_file(void *buf, unsigned long len, enum object_type type,
> unsigned char *sha1)
> {
> @@ -3468,7 +3444,7 @@ int force_object_loose(const unsigned char *sha1, time_t mtime)
>
> if (has_loose_object(sha1))
> return 0;
> - buf = read_packed_sha1(sha1, &type, &len);
> + buf = read_object(sha1, &type, &len);
> if (!buf)
> return error("cannot read sha1_file for %s", sha1_to_hex(sha1));
> hdrlen = xsnprintf(hdr, sizeof(hdr), "%s %lu", typename(type), len) + 1;
