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receive-pack: purge temporary data if no command is ready to run

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When pushing a hidden ref, e.g.:

    $ git push origin HEAD:refs/hidden/foo

"receive-pack" will reject our request with an error message like this:

    ! [remote rejected] HEAD -> refs/hidden/foo (deny updating a hidden ref)

The remote side ("git-receive-pack") will not create the hidden ref as
expected, but the pack file sent by "git-send-pack" is left inside the
remote repository. I.e. the quarantine directory is not purged as it
should be.

Add a checkpoint before calling "tmp_objdir_migrate()" and after calling
the "pre-receive" hook to purge that temporary data in the quarantine
area when there is no command ready to run.

The reason we do not add the checkpoint before the "pre-receive" hook,
but after it, is that the "pre-receive" hook is called with a switch-off
"skip_broken" flag, and all commands, even broken ones, should be fed
by calling "feed_receive_hook()".

Add a new test case in t5516 as well.

Helped-by: Jiang Xin <zhiyou.jx@alibaba-inc.com>
Helped-by: Teng Long <dyroneteng@gmail.com>
Signed-off-by: Chen Bojun <bojun.cbj@alibaba-inc.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Chen Bojun 2022-01-29 14:35:38 +08:00 committed by Junio C Hamano
parent 4c53a8c20f
commit 5407764069
2 changed files with 17 additions and 0 deletions
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9
builtin/receive-pack.c
View file

@ -1971,6 +1971,15 @@ static void execute_commands(struct command *commands,
return;
}
/*
* If there is no command ready to run, should return directly to destroy
* temporary data in the quarantine area.
*/
for (cmd = commands; cmd && cmd->error_string; cmd = cmd->next)
; /* nothing */
if (!cmd)
return;
/*
* Now we'll start writing out refs, which means the objects need
* to be in their final positions so that other processes can see them.

8
t/t5516-fetch-push.sh
View file

@ -1809,4 +1809,12 @@ test_expect_success 'refuse fetch to current branch of bare repository worktree'
git -C bare.git fetch -u .. HEAD:wt
'
test_expect_success 'refuse to push a hidden ref, and make sure do not pollute the repository' '
mk_empty testrepo &&
git -C testrepo config receive.hiderefs refs/hidden &&
git -C testrepo config receive.unpackLimit 1 &&
test_must_fail git push testrepo HEAD:refs/hidden/foo &&
test_dir_is_empty testrepo/.git/objects/pack
'
test_done