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Pass around GIT_*_OBJECT_DIR* variables as relative paths

    • Closed Issue created by Andrew Newdigate @andrewn

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    Git (git-receive-pack) sets GIT_ALTERNATE_OBJECT_DIRECTORIES and GIT_OBJECT_DIRECTORY to absolute paths. This is not compatible with Gitaly. When passing these values, from Git hooks to the GitLab API, or in Gitaly::Repository messages, we must use relative paths.

    Also take extra care with the fact that GIT_ALTERNATE_OBJECT_DIRECTORIES is a list. Don't presume it always has just one entry.

    Reference: #627 (closed)

    Reference: #525 (closed)

    @jacobvosmaer-gitlab wrote:

    The combined rails logs from the API in my test environment paint a clear picture though:

    ==> /var/log/gitlab/gitlab-rails/production.log <==
Started POST "/api/v4/internal/allowed" for 172.18.0.2 at 2017-10-04 12:04:20 +0000

==> /var/log/gitlab/gitlab-rails/api_json.log <==
{"time":"2017-10-04T12:04:20.257Z","severity":"INFO","duration":96.27,"db":4.74,"view":91.53,"status":500,"method":"POST","path":"/api/v4/internal/allowed","params":{"action":"git-receive-pack","changes":"19df4a8a875e7ebe0fb70b97080c75b89a7ac440 95640b336a8f2ae4aae68ab2cd4b8a087e814d7c refs/heads/master\n","gl_repository":"project-1","project":"/var/opt/gitlab/git-data/repositories/root/lalala.git","protocol":"http","env":"{\"GIT_ALTERNATE_OBJECT_DIRECTORIES\":\"/var/opt/gitlab/git-data/repositories/root/lalala.git/./objects\",\"GIT_OBJECT_DIRECTORY\":\"/var/opt/gitlab/git-data/repositories/root/lalala.git/./objects/incoming-lGxxiF\"}","user_id":"1","secret_token":"[FILTERED]"},"host":"app1","ip":"172.18.0.2","ua":"Ruby"}

==> /var/log/gitlab/gitlab-rails/production.log <==

RuntimeError (Got a non-zero exit code while calling out `/opt/gitlab/embedded/bin/git --git-dir=/mnt/data1/repositories/root/lalala.git rev-list --max-count=1 19df4a8a875e7ebe0fb70b97080c75b89a7ac440 ^95640b336a8f2ae4aae68ab2cd4b8a087e814d7c`.):
  /opt/gitlab/embedded/service/gitlab-rails/lib/gitlab/git/rev_list.rb:32:in `execute'
  /opt/gitlab/embedded/service/gitlab-rails/lib/gitlab/git/rev_list.rb:23:in `missed_ref'

    Note how the API receives GIT_ALTERNATE_OBJECT_DIRECTORIES and GIT_OBJECT_DIRECTORY values starting with /var/opt/gitlab/git-data/repositories, and how the failed command runs in /mnt/data1/repositories.

    Also note that the exception trace matches the exceptions we saw in production during the trial. https://sentry.gitlap.com/gitlab/gitlabcom/issues/48184/

    The difficult thing is we have all sorts of 500 errors on this API, now that I look for it https://log.gitlap.com/goto/1b11b68af2eefdd25dbcc15dbf79cac2 .

    I had to find the right sentry query: https://sentry.gitlap.com/gitlab/gitlabcom/?query=is%3Aunresolved+url%3Ahttp%3A%2F%2F0.0.0.0%3A8080%2Fapi%2Fv4%2Finternal%2Fallowed

    Edit: but, we are definitely getting new internal API errors when pushing to a protected branch via gitaly. These errors do not occur with the gitaly push features disabled.

    Edited by Andrew Newdigate
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