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Code Issues Releases Wiki Activity

Respond more gracefully when a git push deletes a nonexistent ref

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Summary:
Fixes T5534. If you `git push origin :refs/tags/doesnotexist` (for some non-existing tag), we get a change where both the old and new refs are empty.

We incorrectly call this an "add", because the old ref is empty. Instead, call this a "delete", but skip the logic which would normally mark it dangerous.

(Possibly we should just reject these outright, but Git allows them, so stick with that for now.)

Test Plan:
Pushed nonexistent refs:

```
  $ git push origin :refs/tags/doesnotexist
  remote: warning: Allowing deletion of corrupt ref.
  To ssh://dweller@localhost/diffusion/POEMS/
   - [deleted]         doesnotexist
  $
```

Reviewers: btrahan

Reviewed By: btrahan

Subscribers: epriestley

Maniphest Tasks: T5534

Differential Revision: https://secure.phabricator.com/D9800
This commit is contained in:
epriestley 2014-07-10 10:17:17 -07:00
parent 16648c28bc
commit 02c3200867
1 changed files with 6 additions and 1 deletions
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7
src/applications/diffusion/engine/DiffusionCommitHookEngine.php
View file

@ -477,7 +477,12 @@ final class DiffusionCommitHookEngine extends Phobject {
$ref_flags = 0;
$dangerous = null;
if ($ref_old === self::EMPTY_HASH) {
if (($ref_old === self::EMPTY_HASH) && ($ref_new === self::EMPTY_HASH)) {
// This happens if you try to delete a tag or branch which does not
// exist by pushing directly to the ref. Git will warn about it but
// allow it. Just call it a delete, without flagging it as dangerous.
$ref_flags |= PhabricatorRepositoryPushLog::CHANGEFLAG_DELETE;
} else if ($ref_old === self::EMPTY_HASH) {
$ref_flags |= PhabricatorRepositoryPushLog::CHANGEFLAG_ADD;
} else if ($ref_new === self::EMPTY_HASH) {
$ref_flags |= PhabricatorRepositoryPushLog::CHANGEFLAG_DELETE;