Support more archive extensions in SendArchive

Closes https://gitlab.com/gitlab-org/gitlab-workhorse/issues/60

CHANGELOG

@@ -2,6 +2,10 @@
 
 Formerly known as 'gitlab-git-http-server'.
 
+v0.8.2 (not released yet)
+
+Recognize more archive formats in git.SendArchive.
+
 v0.8.1
 
 Add Sentry (raven-go) for remote error tracking.

internal/git/archive.go

@@ -40,16 +40,8 @@ func (a *archive) Inject(w http.ResponseWriter, r *http.Request, sendData string
 
 	var format string
 	urlPath := r.URL.Path
-	switch filepath.Base(urlPath) {
-	case "archive.zip":
-		format = "zip"
-	case "archive.tar":
-		format = "tar"
-	case "archive", "archive.tar.gz":
-		format = "tar.gz"
-	case "archive.tar.bz2":
-		format = "tar.bz2"
-	default:
+	format, ok := parseBasename(filepath.Base(urlPath))
+	if !ok {
 		helper.Fail500(w, fmt.Errorf("handleGetArchive: invalid format: %s", urlPath))
 		return
 	}
@@ -183,3 +175,22 @@ func finalizeCachedArchive(tempFile *os.File, archivePath string) error {
 	}
 	return os.Link(tempFile.Name(), archivePath)
 }
+
+func parseBasename(basename string) (string, bool) {
+	var format string
+
+	switch basename {
+	case "archive.zip":
+		format = "zip"
+	case "archive.tar":
+		format = "tar"
+	case "archive", "archive.tar.gz", "archive.tgz", "archive.gz":
+		format = "tar.gz"
+	case "archive.tar.bz2", "archive.tbz", "archive.tbz2", "archive.tb2", "archive.bz2":
+		format = "tar.bz2"
+	default:
+		return "", false
+	}
+
+	return format, true
+}

internal/git/archive_test.go

+package git
+
+import (
+	"testing"
+)
+
+func TestParseBasename(t *testing.T) {
+	for _, testCase := range []struct{ in, out string }{
+		{"", "tar.gz"},
+		{".tar.gz", "tar.gz"},
+		{".tgz", "tar.gz"},
+		{".gz", "tar.gz"},
+		{".tar.bz2", "tar.bz2"},
+		{".tbz", "tar.bz2"},
+		{".tbz2", "tar.bz2"},
+		{".tb2", "tar.bz2"},
+		{".bz2", "tar.bz2"},
+	} {
+		basename := "archive" + testCase.in
+		out, ok := parseBasename(basename)
+		if !ok {
+			t.Fatalf("parseBasename did not recognize %q", basename)
+		}
+
+		if out != testCase.out {
+			t.Fatalf("expected %q, got %q", testCase.out, out)
+		}
+	}
+}