Fix azure devops git clone error (#400)

* fix git clone in azure devops

* Add unit tests

* Fix imports

cmd/gitcloner/gogit/cloner.go

@@ -6,6 +6,7 @@ import (
 
 	"github.com/go-git/go-git/v5"
 	"github.com/go-git/go-git/v5/plumbing"
+	"github.com/go-git/go-git/v5/plumbing/protocol/packp/capability"
 	"github.com/go-git/go-git/v5/plumbing/transport"
 	httpgit "github.com/go-git/go-git/v5/plumbing/transport/http"
 	gossh "github.com/go-git/go-git/v5/plumbing/transport/ssh"
@@ -37,6 +38,12 @@ func NewCloner() *Cloner {
 }
 
 func (c *Cloner) CloneRepo(opts *cmd.Options) error {
+	// Azure DevOps requires capabilities multi_ack / multi_ack_detailed,
+	// which are not fully implemented and by default are included in
+	// transport.UnsupportedCapabilities.
+	transport.UnsupportedCapabilities = []capability.Capability{
+		capability.ThinPack,
+	}
 	auth, err := createAuthFromOpts(opts)
 	if err != nil {
 		return err

cmd/gitcloner/gogit/cloner_test.go

@@ -5,6 +5,9 @@ import (
 	"os"
 	"testing"
 
+	"github.com/go-git/go-git/v5/plumbing/protocol/packp/capability"
+	"github.com/go-git/go-git/v5/plumbing/transport"
+
 	"github.com/go-git/go-git/v5"
 	httpgit "github.com/go-git/go-git/v5/plumbing/transport/http"
 	gossh "github.com/go-git/go-git/v5/plumbing/transport/ssh"
@@ -172,6 +175,10 @@ udiSlDctMM/X3ZM2JN5M1rtAJ2WR3ZQtmWbOjZAbG2Eq
 			if !cmp.Equal(cloneOptsCalled, test.expectedCloneOpts, sshKeyComparer) {
 				t.Fatalf("expected options %v, got %v", test.expectedCloneOpts, cloneOptsCalled)
 			}
+
+			if !cmp.Equal(transport.UnsupportedCapabilities, []capability.Capability{capability.ThinPack}) {
+				t.Errorf("expected transport.UnsupportedCapabilities []capability.Capability{capability.ThinPack}, got %v", transport.UnsupportedCapabilities)
+			}
 		})
 	}
 }