Replace all usages of `git` command with configurable binary path

Closes #3311

app/models/repository.rb

@@ -89,7 +89,7 @@ class Repository
   def find_commits_by_message(query)
     # Limited to 1000 commits for now, could be parameterized?
-    args = %W(git log --pretty=%H --max-count 1000 --grep=#{query})
+    args = %W(#{Gitlab.config.git.bin_path} log --pretty=%H --max-count 1000 --grep=#{query})
     git_log_results = Gitlab::Popen.popen(args, path_to_repo).first.lines.map(&:chomp)
     commits = git_log_results.map { |c| commit(c) }
@@ -296,7 +296,7 @@ class Repository
   end
   def last_commit_for_path(sha, path)
-    args = %W(git rev-list --max-count=1 #{sha} -- #{path})
+    args = %W(#{Gitlab.config.git.bin_path} rev-list --max-count=1 #{sha} -- #{path})
     sha = Gitlab::Popen.popen(args, path_to_repo).first.strip
     commit(sha)
   end
@@ -347,7 +347,7 @@ class Repository
   end
   def branch_names_contains(sha)
-    args = %W(git branch --contains #{sha})
+    args = %W(#{Gitlab.config.git.bin_path} branch --contains #{sha})
     names = Gitlab::Popen.popen(args, path_to_repo).first
     if names.respond_to?(:split)
@@ -364,7 +364,7 @@ class Repository
   end
   def tag_names_contains(sha)
-    args = %W(git tag --contains #{sha})
+    args = %W(#{Gitlab.config.git.bin_path} tag --contains #{sha})
     names = Gitlab::Popen.popen(args, path_to_repo).first
     if names.respond_to?(:split)
@@ -505,7 +505,7 @@ class Repository
   def search_files(query, ref)
     offset = 2
-    args = %W(git grep -i -n --before-context #{offset} --after-context #{offset} -e #{query} #{ref || root_ref})
+    args = %W(#{Gitlab.config.git.bin_path} grep -i -n --before-context #{offset} --after-context #{offset} -e #{query} #{ref || root_ref})
     Gitlab::Popen.popen(args, path_to_repo).first.scrub.split(/^--$/)
   end
@@ -537,7 +537,7 @@ class Repository
   end
   def fetch_ref(source_path, source_ref, target_ref)
-    args = %W(git fetch -f #{source_path} #{source_ref}:#{target_ref})
+    args = %W(#{Gitlab.config.git.bin_path} fetch -f #{source_path} #{source_ref}:#{target_ref})
     Gitlab::Popen.popen(args, path_to_repo)
   end

config/initializers/2_app.rb

 module Gitlab
-  VERSION = File.read(Rails.root.join("VERSION")).strip
-  REVISION = Gitlab::Popen.popen(%W(git log --pretty=format:%h -n 1)).first.chomp
-
   def self.config
     Settings
   end
+
+  VERSION = File.read(Rails.root.join("VERSION")).strip
+  REVISION = Gitlab::Popen.popen(%W(#{config.git.bin_path} log --pretty=format:%h -n 1)).first.chomp
 end

lib/backup/repository.rb

@@ -35,7 +35,7 @@ module Backup
           if wiki.repository.empty?
             $progress.puts " [SKIPPED]".cyan
           else
-            cmd = %W(git --git-dir=#{path_to_repo(wiki)} bundle create #{path_to_bundle(wiki)} --all)
+            cmd = %W(#{Gitlab.config.git.bin_path} --git-dir=#{path_to_repo(wiki)} bundle create #{path_to_bundle(wiki)} --all)
             output, status = Gitlab::Popen.popen(cmd)
             if status.zero?
               $progress.puts " [DONE]".green
@@ -67,7 +67,7 @@ module Backup
           FileUtils.mkdir_p(path_to_repo(project))
           cmd = %W(tar -xf #{path_to_bundle(project)} -C #{path_to_repo(project)})
         else
-          cmd = %W(git init --bare #{path_to_repo(project)})
+          cmd = %W(#{Gitlab.config.git.bin_path} init --bare #{path_to_repo(project)})
         end
         if system(*cmd, silent)
@@ -87,7 +87,7 @@ module Backup
           # that was initialized with ProjectWiki.new() and then
           # try to restore with 'git clone --bare'.
           FileUtils.rm_rf(path_to_repo(wiki))
-          cmd = %W(git clone --bare #{path_to_bundle(wiki)} #{path_to_repo(wiki)})
+          cmd = %W(#{Gitlab.config.git.bin_path} clone --bare #{path_to_bundle(wiki)} #{path_to_repo(wiki)})
           if system(*cmd, silent)
             $progress.puts " [DONE]".green

lib/gitlab/force_push_check.rb

@@ -7,7 +7,7 @@ module Gitlab
       if Gitlab::Git.blank_ref?(oldrev) || Gitlab::Git.blank_ref?(newrev)
         false
       else
-        missed_refs, _ = Gitlab::Popen.popen(%W(git --git-dir=#{project.repository.path_to_repo} rev-list #{oldrev} ^#{newrev}))
+        missed_refs, _ = Gitlab::Popen.popen(%W(#{Gitlab.config.git.bin_path} --git-dir=#{project.repository.path_to_repo} rev-list #{oldrev} ^#{newrev}))
         missed_refs.split("\n").size > 0
       end
     end

lib/gitlab/git_ref_validator.rb

@@ -6,7 +6,7 @@ module Gitlab
     # Returns true for a valid reference name, false otherwise
     def validate(ref_name)
       Gitlab::Utils.system_silent(
-        %W(git check-ref-format refs/#{ref_name}))
+        %W(#{Gitlab.config.git.bin_path} check-ref-format refs/#{ref_name}))
     end
   end
 end

lib/gitlab/upgrader.rb

@@ -50,15 +50,15 @@ module Gitlab
     end
     def fetch_git_tags
-      remote_tags, _ = Gitlab::Popen.popen(%W(git ls-remote --tags https://gitlab.com/gitlab-org/gitlab-ce.git))
+      remote_tags, _ = Gitlab::Popen.popen(%W(#{Gitlab.config.git.bin_path} ls-remote --tags https://gitlab.com/gitlab-org/gitlab-ce.git))
       remote_tags.split("\n").grep(/tags\/v#{current_version.major}/)
     end
     def update_commands
       {
-        "Stash changed files" => %W(git stash),
-        "Get latest code" => %W(git fetch),
-        "Switch to new version" => %W(git checkout v#{latest_version}),
+        "Stash changed files" => %W(#{Gitlab.config.git.bin_path} stash),
+        "Get latest code" => %W(#{Gitlab.config.git.bin_path} fetch),
+        "Switch to new version" => %W(#{Gitlab.config.git.bin_path} checkout v#{latest_version}),
         "Install gems" => %W(bundle),
         "Migrate DB" => %W(bundle exec rake db:migrate),
         "Recompile assets" => %W(bundle exec rake assets:clean assets:precompile),

lib/tasks/gitlab/check.rake

@@ -824,7 +824,7 @@ namespace :gitlab do
         repo_dirs = Dir.glob(File.join(namespace_dir, '*'))
         repo_dirs.each do |dir|
           puts "\nChecking repo at #{dir}"
-          system(*%w(git fsck), chdir: dir)
+          system(*%W(#{Gitlab.config.git.bin_path} fsck), chdir: dir)
         end
       end
     end

lib/tasks/gitlab/shell.rake

@@ -17,7 +17,7 @@ namespace :gitlab do
       # Clone if needed
       unless File.directory?(target_dir)
-        system(*%W(git clone -- #{args.repo} #{target_dir}))
+        system(*%W(#{Gitlab.config.git.bin_path} clone -- #{args.repo} #{target_dir}))
       end
       # Make sure we're on the right tag
@@ -27,7 +27,7 @@ namespace :gitlab do
         reseted = reset_to_commit(args)
         unless reseted
-          system(*%W(git fetch origin))
+          system(*%W(#{Gitlab.config.git.bin_path} fetch origin))
           reset_to_commit(args)
         end
@@ -128,14 +128,14 @@ namespace :gitlab do
   end
   def reset_to_commit(args)
-    tag, status = Gitlab::Popen.popen(%W(git describe -- #{args.tag}))
+    tag, status = Gitlab::Popen.popen(%W(#{Gitlab.config.git.bin_path} describe -- #{args.tag}))
     unless status.zero?
-      tag, status = Gitlab::Popen.popen(%W(git describe -- origin/#{args.tag}))
+      tag, status = Gitlab::Popen.popen(%W(#{Gitlab.config.git.bin_path} describe -- origin/#{args.tag}))
     end
     tag = tag.strip
-    system(*%W(git reset --hard #{tag}))
+    system(*%W(#{Gitlab.config.git.bin_path} reset --hard #{tag}))
   end
 end

spec/models/project_wiki_spec.rb

@@ -223,7 +223,7 @@ describe ProjectWiki do
   def create_temp_repo(path)
     FileUtils.mkdir_p path
-    system(*%W(git init --quiet --bare -- #{path}))
+    system(*%W(#{Gitlab.config.git.bin_path} init --quiet --bare -- #{path}))
   end
   def remove_temp_repo(path)

spec/requests/api/repositories_spec.rb

@@ -36,8 +36,8 @@ describe API::API, api: true  do
       it 'should create a new annotated tag' do
         # Identity must be set in .gitconfig to create annotated tag.
         repo_path = project.repository.path_to_repo
-        system(*%W(git --git-dir=#{repo_path} config user.name #{user.name}))
-        system(*%W(git --git-dir=#{repo_path} config user.email #{user.email}))
+        system(*%W(#{Gitlab.config.git.bin_path} --git-dir=#{repo_path} config user.name #{user.name}))
+        system(*%W(#{Gitlab.config.git.bin_path} --git-dir=#{repo_path} config user.email #{user.email}))
         post api("/projects/#{project.id}/repository/tags", user),
              tag_name: 'v7.1.0',

spec/support/test_env.rb

@@ -96,15 +96,15 @@ module TestEnv
     clone_url = "https://gitlab.com/gitlab-org/#{repo_name}.git"
     unless File.directory?(repo_path)
-      system(*%W(git clone -q #{clone_url} #{repo_path}))
+      system(*%W(#{Gitlab.config.git.bin_path} clone -q #{clone_url} #{repo_path}))
     end
     Dir.chdir(repo_path) do
       branch_sha.each do |branch, sha|
         # Try to reset without fetching to avoid using the network.
-        reset = %W(git update-ref refs/heads/#{branch} #{sha})
+        reset = %W(#{Gitlab.config.git.bin_path} update-ref refs/heads/#{branch} #{sha})
         unless system(*reset)
-          if system(*%w(git fetch origin))
+          if system(*%W(#{Gitlab.config.git.bin_path} fetch origin))
             unless system(*reset)
               raise 'The fetched test seed '\
               'does not contain the required revision.'
@@ -117,7 +117,7 @@ module TestEnv
     end
     # We must copy bare repositories because we will push to them.
-    system(git_env, *%W(git clone -q --bare #{repo_path} #{repo_path_bare}))
+    system(git_env, *%W(#{Gitlab.config.git.bin_path} clone -q --bare #{repo_path} #{repo_path_bare}))
   end
   def copy_repo(project)