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get_oid(): when an object was not found, try harder

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It is quite possible that the loose object cache gets stale when new
objects are written. In that case, get_oid() would potentially say that
it cannot find a given object, even if it should find it.

Let's blow away the loose object cache as well as the read packs and try
again in that case.

Note: this does *not* affect the code path that was introduced to help
avoid looking for the same non-existing objects (which made some
operations really expensive via NFS): that code path is handled by the
`OBJECT_INFO_QUICK` flag (which does not even apply to `get_oid()`,
which has no equivalent flag, at least at the time this patch was
written).

This incidentally fixes the problem identified earlier where an
interactive rebase wanted to re-read (and validate) the todo list after
an `exec` command modified it.

Helped-by: Jeff King <peff@peff.net>
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Johannes Schindelin 2019-03-13 03:16:34 -07:00 committed by Junio C Hamano
parent 01710d0a3f
commit 6d67a993b2
2 changed files with 13 additions and 1 deletions
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12
sha1-name.c
View File

@ -442,6 +442,18 @@ static enum get_oid_result get_short_oid(const char *name, int len,
find_short_packed_object(&ds);
status = finish_object_disambiguation(&ds, oid);
/*
* If we didn't find it, do the usual reprepare() slow-path,
* since the object may have recently been added to the repository
* or migrated from loose to packed.
*/
if (status == MISSING_OBJECT) {
reprepare_packed_git(the_repository);
find_short_object_filename(&ds);
find_short_packed_object(&ds);
status = finish_object_disambiguation(&ds, oid);
}
if (!quietly && (status == SHORT_NAME_AMBIGUOUS)) {
struct oid_array collect = OID_ARRAY_INIT;

2
t/t3429-rebase-edit-todo.sh
View File

@ -11,7 +11,7 @@ test_expect_success 'rebase exec modifies rebase-todo' '
test -e F
'
test_expect_failure SHA1 'loose object cache vs re-reading todo list' '
test_expect_success SHA1 'loose object cache vs re-reading todo list' '
GIT_REBASE_TODO=.git/rebase-merge/git-rebase-todo &&
export GIT_REBASE_TODO &&
write_script append-todo.sh <<-\EOS &&