Implement recursive submodule update

This adds support for repositories having submodules. Nevertheless all
the required clone operations are complete which makes this process time
consuming depending on the list of submodules.

1 files changed, 19 insertions, 1 deletions

diff --git a/main.go b/main.go
index 86b689d..9020aaa 100644
--- a/main.go
+++ b/main.go
@@ -36,9 +36,12 @@ func main() {
 	}
 }
 
-func runCommand(name string, args ...string) {
+func runCommand(dir string, name string, args ...string) {
 	log.Printf("%s %s\n", name, strings.Join(args, " "))
 	command := exec.Command(name, args...)
+	command.Dir = dir
+	command.Stderr = os.Stderr
+	command.Stdout = os.Stdout
 	err := command.Run()
 	if err != nil {
 		log.Fatal(err)
@@ -53,6 +56,7 @@ func prepareWorkbench(repo string, commit string) string {
 	defer os.RemoveAll(workbench)
 
 	runCommand(
+		workbench,
 		"git",
 		"clone",
 		repo,
@@ -60,6 +64,7 @@ func prepareWorkbench(repo string, commit string) string {
 	)
 
 	runCommand(
+		workbench,
 		"git",
 		"--git-dir",
 		filepath.Join(workbench, ".git"),
@@ -69,6 +74,19 @@ func prepareWorkbench(repo string, commit string) string {
 		commit,
 	)
 
+	runCommand(
+		workbench,
+		"git",
+		"--git-dir",
+		filepath.Join(workbench, ".git"),
+		"--work-tree",
+		workbench,
+		"submodule",
+		"update",
+		"--init",
+		"--recursive",
+	)
+
 	return workbench
 }