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sha1_file: fix iterating loose alternate objects

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The string in 'base' contains a path suffix to a specific object;
when its value is used, the suffix must either be filled (as in
stat_sha1_file, open_sha1_file, check_and_freshen_nonlocal) or
cleared (as in prepare_packed_git) to avoid junk at the end.

660c889e (sha1_file: add for_each iterators for loose and packed
objects, 2014-10-15) introduced loose_from_alt_odb(), but this did
neither and treated 'base' as a complete path to the "base" object
directory, instead of a pointer to the "base" of the full path
string.

The trailing path after 'base' is still initialized to NUL, hiding
the bug in some common cases.  Additionally the descendent
for_each_file_in_obj_subdir() function swallows ENOENT, so an error
only shows if the alternate's path was last filled with a valid
object (where statting /path/to/existing/00/0bjectfile/00 fails).

Signed-off-by: Jonathon Mah <me@JonathonMah.com>
Helped-by: Kyle J. McKay <mackyle@gmail.com>
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Jonathon Mah 2015-02-08 20:15:39 -05:00 committed by Junio C Hamano
parent e6f875e052
commit b0a4264277
2 changed files with 18 additions and 3 deletions
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13
sha1_file.c
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@ -3406,9 +3406,16 @@ static int loose_from_alt_odb(struct alternate_object_database *alt,
void *vdata)
{
struct loose_alt_odb_data *data = vdata;
return for_each_loose_file_in_objdir(alt->base,
data->cb, NULL, NULL,
data->data);
struct strbuf buf = STRBUF_INIT;
int r;
/* copy base not including trailing '/' */
strbuf_add(&buf, alt->base, alt->name - alt->base - 1);
r = for_each_loose_file_in_objdir_buf(&buf,
data->cb, NULL, NULL,
data->data);
strbuf_release(&buf);
return r;
}
int for_each_loose_object(each_loose_object_fn cb, void *data)

8
t/t5304-prune.sh
View file

@ -253,4 +253,12 @@ test_expect_success 'prune .git/shallow' '
test_path_is_missing .git/shallow
'
test_expect_success 'prune: handle alternate object database' '
test_create_repo A &&
git -C A commit --allow-empty -m "initial commit" &&
git clone --shared A B &&
git -C B commit --allow-empty -m "next commit" &&
git -C B prune
'
test_done