Require Git v2.29.0

We have been moving our infrastructure to Git v2.29.0, so we can now
finally require use of that or a higher version. This is done to allow
us to make use of the following features:

- Split commit graphs, which have been introduced with Git v2.27.0.
  These allow more efficient creation of commit-graphs to speed up
  various operations on Git version history.

- Reference transaction hook, introduced with Git v2.28.0 and fixed with
  Git v2.29.0. This is required to implement strong consistency used by
  Gitaly and Praefect for all reference updates in a Git repository.

changelogs/unreleased/pks-require-git-v2-29-0.yml

+---
+title: Require Git v2.29.0
+merge_request: 46433
+author:
+type: changed

doc/install/installation.md

@@ -135,7 +135,7 @@ Make sure you have the right version of Git installed:
 # Install Git
 sudo apt-get install -y git-core
 
-# Make sure Git is version 2.24.0 or higher (recommended version is 2.28.0)
+# Make sure Git is version 2.29.0 or higher (recommended version is 2.29.0)
 git --version
 ```
 

doc/install/requirements.md

@@ -57,6 +57,10 @@ The minimum required Go version is 1.13.
 
 ### Git versions
 
+From GitLab 13.6:
+
+- Git 2.29.x and later is required.
+
 From GitLab 13.1:
 
 - Git 2.24.x and later is required.

doc/update/README.md

@@ -222,6 +222,10 @@ possible.
 
 ## Version specific upgrading instructions
 
+### 13.6.0
+
+The required Git version is Git v2.29 or higher.
+
 ### 13.3.0
 
 The recommended Git version is Git v2.28. The minimum required version of Git

doc/update/upgrading_from_source.md

@@ -132,7 +132,7 @@ To check you are running the minimum required Git version, see
 In Debian or Ubuntu:
 
 ```shell
-# Make sure Git is version 2.24.0 or higher
+# Make sure Git is version 2.29.0 or higher
 git --version
 
 # Remove packaged Git

lib/system_check/app/git_version_check.rb

@@ -7,7 +7,7 @@ module SystemCheck
       set_check_pass -> { "yes (#{self.current_version})" }
 
       def self.required_version
-        @required_version ||= Gitlab::VersionInfo.parse('2.24.0')
+        @required_version ||= Gitlab::VersionInfo.parse('2.29.0')
       end
 
       def self.current_version