Lazy Git blobs

To prevent madness like loading a 100MB file into Ruby's memory just to decide whether it is binary or text.

mentioned in merge request !2451 (merged)

Needs https://gitlab.com/gitlab-org/gitlab_git/merge_requests/64

Added 1 commit:

• 29d37602 - Update gitlab_git (lazy-blob branch)

Added 1 commit:

• b1a7cb57 - Update gitlab_git@lazy-blob again

Unless we also merge https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/2451 , this MR will break images > 1KB in the tree browser.

Seeing a string of failures that look like:

  6) Comments On a merge request diff when adding a note the note form should be removed when canceled
     Failure/Error: Unable to find matching line from backtrace
     ActionView::Template::Error:
       Revspec '645f6c4c82fd3f5e06f67134450a570b795e55a6' not found.

Added 1 commit:

• b4e6ee7a - Update development version of gitlab_git

Now something about CI secret variables.

=========

  1) Ci::Variable value fails to decrypt if iv is incorrect
     Failure/Error: expect { subject.value }.
       expected OpenSSL::Cipher::CipherError with "bad decrypt" but nothing was raised
     # ./spec/models/ci/variable_spec.rb:42:in `block (3 levels) in <top (required)>'

Progress: |================output error : unknown encoding ASCII-8BIT
output error : unknown encoding ASCII-8BIT
=======================================/builds/gitlab-org/gitlab-ce/spec/models/repository_spec.rb:109: warning: already initialized constant TestBlob
/builds/gitlab-org/gitlab-ce/spec/models/repository_spec.rb:109: warning: previous definition of TestBlob was here
=============|

Reassigned to @DouweM

This is ready for review but we need to take care when merging to first:

• release a new gitlab_git with gitlab_git!64 (merged), and
• update the Gemfile in this MR to use the then latest version of gitlab_git.

cc @yorickpeterse

mentioned in merge request gitlab_git!64 (merged)

@jacobvosmaer LGTM! (Except for the stylistic complaint, that is)

Reassigned to @jacobvosmaer

Added 1 commit:

• c76e6b98 - Move load command into _text partial

Added 1 commit:

• 0a4db90d - Use begin/end instead of defined?

Added 20 commits:

• 0a4db90d...6cffcb05 - 18 commits from branch master
• e08aa3df - Use gitlab_git 8.0.0
• d3affe8b - Merge remote-tracking branch 'origin/master' into lazy-blobs

Title changed from WIP Lazy Git blobs to Lazy Git blobs

mentioned in commit 53726415

Status changed to merged