Fix MergeRequest#source_sha when there is no diff
Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/14170
### Overview
This MR fixes an unhandled Exception when visiting the page of an open Merge Request without diff.
### Description
`MergeRequest#source_sha` is expected to return the sha of the source branch last commit. But when an open Merge Request has no diff (e.g. all commits have already been merged to the target branch), `merge_request.source_sha` incorrectly returns `nil`.
This was without consequences before – but since !2217 was merged (a few days ago), it makes `Gitlab::Git::Commit.between` raise an "Unexpected nil argument" exception. This can be reproduced when visiting the http://localhost:3000/gitlab-org/gitlab-test/merge_requests/2 page on a fresh local Gitlab setup.
This MR fixes the crash, by making sure that `source_sha` returns a
correct result even when there is no diff available. I also added tests.
@DouweM I believe you wrote most of this code in the first place ; does this looks correct to you, or is there a better way to resolve this issue maybe?
See merge request !3135
The avatar logic has been moved from Project to Repository as this makes
caching easier. The logic itself in turn has been changed so that the
logo file names are cached in Redis. This cache is flushed upon pushing
a commit but _only_ if:
1. The commit was pushed to the default branch
2. The commit actually changes any of the logo files
If no branch or commit is given the cache is flushed anyway, this
ensures that calling Repository#expire_cache without any arguments still
flushes the avatar cache (e.g. this is used when removing a project).
Fixesgitlab-org/gitlab-ce#14363
External Users
The user has the rights of a public user execpt it can never create a project, group, or team. Also it cant view internal projects.
Partially fix for both #4009 and #13938 (except the LDAP sync or a pattern to detect external users)

See merge request !3171
`MergeRequest#source_sha` is expected to return the sha of the source
branch last commit.
But when a open Merge Request has no diff (e.g. all commits have already
been merged to the target branch), `merge_request.source_sha`
incorrectly returns `nil`.
This was un-noticed before – but now that !2217 has been merged,
it makes `Gitlab::Git::Commit.between` raise an
"Unexpected nil argument" exception.
This fixes the crash, by making sure that `source_sha` returns a
correct result even when there is no diff available.
1. Make the "subscribed" text in Issuable sidebar reflect the labels
subscription status
2. Current user mut be logged-in to toggle issue/MR/label subscription
1. Allow subscribing (the current user) to a label
- Refactor the `Subscription` coffeescript class
- The main change is that it accepts a container, and conducts all
DOM queries within its scope. We need this because the labels
page has multiple instances of `Subscription` on the same page.
2. Creating an issue or MR with labels notifies users subscribed to those labels
- Label `has_many` subscribers through subscriptions.
3. Adding a label to an issue or MR notifies users subscribed to those labels
- This only applies to subscribers of the label that has just been
added, not all labels for the issue.
Ignore eager loading in Project.search UNION
This fixes issues such as filtering groups by names on pages such as
https://gitlab.com/dashboard/groups.
See merge request !3229
The queries that are UNION'd together don't need any eager loading
(since we really only use the resulting SQL instead of having
ActiveRecord actually run the queries). By dropping any eager loaded
associations queries such as the following work instead of producing a
SQL error:
Project.all.includes(:namespace).search('foo')
Cleanup Ci::Commit, Ci::Build and CommitStatus views
This MR tries to do first sweep of cleanups to Ci::Commit and
Ci::Build objects removing all view-related functions and fixing the
API from other side.
Fixes: https://gitlab.com/gitlab-org/gitlab-ce/issues/6046
See merge request !2760
Bring from EE: Share Project with Group
- [x] Models and migrations
- [x] Logic, UI
- [x] Tests
- [x] Documentation
- [x] Share with group lock
- [x] Api feature
- [x] Api docs
- [x] Api tests
Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>
For #12831
cc @DouweM @rspeicher @vsizov
See merge request !3186
- Remove unused Gitlab::Application.routes.url_helpers from Ci::Build
- Remove too much logic from a view, use Ci::Commit.matrix_builds
- Use ci_status_with_icon
- Don't describe symbols
- Remove all view related methods from Ci::Build and CommitStatus
- Remove unused Ci::Commit and Ci::Build methods
- Use polymorphism to render different types of CommitStatus
It's unclear how these blank values got added, but GitLab.com had a few:
```
irb(main):002:0> Note.where("line_code IS NOT NULL AND line_code = ''").count
=> 439
```
We've added a migration to convert any existing records to use a NULL
value when blank, and updated Note to set blank values to nil before
validation.
The OR condition for source_project_id/target_project_id leads to a
query plan that performs rather poorly on PostgreSQL due to the use of
sub-queries. Because Rails offers no easy alternative for this
particular problem we're forced to using a UNION for both conditions.
The resulting query performs much faster than just using an OR.