Fix SSH support for Git for Windows v2.14

Git For Windows 2.14 has a patch that changes `git-upload-pack` to `git upload-pack`.
To make this work for gitlab-shell, just map this to `git-upload-pack`.

Closes gitlab-org/gitlab-ce#36028

CHANGELOG

+v5.8.0
+  - Fix SSH support for Git for Windows v2.14
+
 v5.7.0
   - Support unhiding of all refs via Gitaly
 

lib/gitlab_shell.rb

@@ -38,7 +38,7 @@ class GitlabShell
     end
 
     args = Shellwords.shellwords(origin_cmd)
-    parse_cmd(args)
+    args = parse_cmd(args)
 
     if GIT_COMMANDS.include?(args.first)
       GitlabMetrics.measure('verify-access') { verify_access }
@@ -70,10 +70,17 @@ class GitlabShell
   protected
 
   def parse_cmd(args)
-    @command = args.first
+    # Handle Git for Windows 2.14 using "git upload-pack" instead of git-upload-pack
+    if args.length == 3 && args.first == 'git'
+      @command = "git-#{args[1]}"
+      args = [@command, args.last]
+    else
+      @command = args.first
+    end
+
     @git_access = @command
 
-    return if API_COMMANDS.include?(@command)
+    return args if API_COMMANDS.include?(@command)
 
     raise DisallowedCommandError unless GIT_COMMANDS.include?(@command)
 
@@ -93,6 +100,8 @@ class GitlabShell
       raise DisallowedCommandError unless args.count == 2
       @repo_name = args.last
     end
+
+    args
   end
 
   def verify_access

spec/gitlab_shell_spec.rb

@@ -132,8 +132,8 @@ describe GitlabShell do
   describe :exec do
     let(:gitaly_message) { JSON.dump({ 'repository' => { 'relative_path' => repo_name, 'storage_name' => 'default' }, 'gl_repository' => gl_repository , 'gl_id' => key_id}) }
 
-    context 'git-upload-pack' do
-      let(:ssh_cmd) { "git-upload-pack gitlab-ci.git" }
+    shared_examples_for 'upload-pack' do |command|
+      let(:ssh_cmd) { "#{command} gitlab-ci.git" }
       after { subject.exec(ssh_cmd) }
 
       it "should process the command" do
@@ -157,6 +157,14 @@ describe GitlabShell do
       end
     end
 
+    context 'git-upload-pack' do
+      it_behaves_like 'upload-pack', 'git-upload-pack'
+    end
+
+    context 'git upload-pack' do
+      it_behaves_like 'upload-pack', 'git upload-pack'
+    end
+
     context 'gitaly-upload-pack with GeoNode' do
       let(:ssh_cmd) { "git-upload-pack gitlab-ci.git" }
       let(:gitaly_check_access_with_geo) { GitAccessStatus.new(true, 'ok', gl_repository, repo_path, { 'repository' => { 'relative_path' => repo_name, 'storage_name' => 'default'} , 'address' => 'unix:gitaly.socket' }, true) }