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epriestley d28ddc21a5 Don't error when trying to mirror or observe an empty repository 
Summary:
Fixes T5965.

Fixes two issues:

  - Observing an empty repository could write a warning to the log.
  - Mirroring an empty repository to a remote could fail.

For observing:

If newly-created with `git init --bare`, `git ls-remote` will
return the empty string.  Properly return an empty set of refs, rather
than attempting to parse the single "line" that is produced by
splitting that on newlines:

```
[2018-01-23 18:47:00] ERROR 8: Undefined offset: 1 at [/phab_path/phabricator/src/applications/repository/engine/PhabricatorRepositoryPullEngine.php:405]
arcanist(head=master, ref.master=5634f8410176), phabricator(head=master, ref.master=12551a1055ce), phutil(head=master, ref.master=4755785517cf)
  #0 PhabricatorRepositoryPullEngine::loadGitRemoteRefs(PhabricatorRepository) called at [<phabricator>/src/applications/repository/engine/PhabricatorRepositoryPullEngine.php:343]
  #1 PhabricatorRepositoryPullEngine::executeGitUpdate() called at [<phabricator>/src/applications/repository/engine/PhabricatorRepositoryPullEngine.php:126]
  #2 PhabricatorRepositoryPullEngine::pullRepositoryWithLock() called at [<phabricator>/src/applications/repository/engine/PhabricatorRepositoryPullEngine.php:40]
  #3 PhabricatorRepositoryPullEngine::pullRepository() called at [<phabricator>/src/applications/repository/management/PhabricatorRepositoryManagementUpdateWorkflow.php:59]
  ...
```

For mirroring:

`git` treats `git push --mirror` specially when a repository is empty. Detect this case by seeing if `git for-each-ref --count 1` does anything. If the repository is empty, just bail.

Test Plan:
  - Observed an empty and non-empty repository.
  - Mirrored an empty and non-empty repository.

Reviewers: alexmv, amckinley

Reviewed By: alexmv

Subscribers: Korvin, epriestley

Maniphest Tasks: T5965

Differential Revision: https://secure.phabricator.com/D18920
2018-01-24 15:50:30 -08:00
bin Allow bulk edits to be made silently if you have CLI access 2018-01-19 13:24:54 -08:00
conf Support "ssl.chain" in Aphlict configuration 2016-04-14 10:41:21 -07:00
externals Add profile images to Repositories 2017-06-12 07:51:39 -07:00
resources Mark all existing password hashes as "legacy" and start upgrading digest formats 2018-01-23 14:01:09 -08:00
scripts Fix failure to record pullerPHID in repository pull logs 2018-01-23 14:09:42 -08:00
src Don't error when trying to mirror or observe an empty repository 2018-01-24 15:50:30 -08:00
support Tweak rate limiting point counts for omnipotent users 2017-10-16 06:43:54 -07:00
webroot Respect token limits for "Assign to" and custom datasource fields in Herald 2018-01-22 11:54:12 -08:00
.arcconfig Set "history.immutable" to "false" explicitly in .arcconfig 2016-08-03 08:12:49 -07:00
.arclint Begin adding test coverage to GitHub Events API parsers 2016-03-09 09:30:07 -08:00
.arcunit Use the configuration driven unit test engine 2015-08-11 07:57:11 +10:00
.editorconfig Fix text lint issues 2015-02-12 07:00:13 +11:00
.gitignore Make i18n string extraction faster and more flexible 2016-07-04 10:23:30 -07:00
LICENSE Fix text lint issues 2015-02-12 07:00:13 +11:00
NOTICE Update Phabricator NOTICE file to reflect modern legal circumstances 2014-06-25 13:42:13 -07:00
README.md Remove push to IRC from "readme.md" too 2015-10-24 18:39:16 -07:00

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