1 files changed, 56 insertions, 0 deletions
diff --git a/repository/git_cli.go b/repository/git_cli.go
new file mode 100644
index 00000000..085b1cda
--- /dev/null
+++ b/repository/git_cli.go
@@ -0,0 +1,56 @@
+package repository
+
+import (
+	"bytes"
+	"fmt"
+	"io"
+	"os/exec"
+	"strings"
+)
+
+// gitCli is a helper to launch CLI git commands
+type gitCli struct {
+	path string
+}
+
+// Run the given git command with the given I/O reader/writers, returning an error if it fails.
+func (cli gitCli) runGitCommandWithIO(stdin io.Reader, stdout, stderr io.Writer, args ...string) error {
+	// make sure that the working directory for the command
+	// always exist, in particular when running "git init".
+	path := strings.TrimSuffix(cli.path, ".git")
+
+	// fmt.Printf("[%s] Running git %s\n", path, strings.Join(args, " "))
+
+	cmd := exec.Command("git", args...)
+	cmd.Dir = path
+	cmd.Stdin = stdin
+	cmd.Stdout = stdout
+	cmd.Stderr = stderr
+
+	return cmd.Run()
+}
+
+// Run the given git command and return its stdout, or an error if the command fails.
+func (cli gitCli) runGitCommandRaw(stdin io.Reader, args ...string) (string, string, error) {
+	var stdout bytes.Buffer
+	var stderr bytes.Buffer
+	err := cli.runGitCommandWithIO(stdin, &stdout, &stderr, args...)
+	return strings.TrimSpace(stdout.String()), strings.TrimSpace(stderr.String()), err
+}
+
+// Run the given git command and return its stdout, or an error if the command fails.
+func (cli gitCli) runGitCommandWithStdin(stdin io.Reader, args ...string) (string, error) {
+	stdout, stderr, err := cli.runGitCommandRaw(stdin, args...)
+	if err != nil {
+		if stderr == "" {
+			stderr = "Error running git command: " + strings.Join(args, " ")
+		}
+		err = fmt.Errorf(stderr)
+	}
+	return stdout, err
+}
+
+// Run the given git command and return its stdout, or an error if the command fails.
+func (cli gitCli) runGitCommand(args ...string) (string, error) {
+	return cli.runGitCommandWithStdin(nil, args...)
+}