gitutil: sanitize root dir on WSL

Signed-off-by: CrazyMax <1951866+crazy-max@users.noreply.github.com>

util/gitutil/gitutil.go

@@ -66,7 +66,11 @@ func (c *Git) IsDirty() bool {
 }
 
 func (c *Git) RootDir() (string, error) {
-	return c.clean(c.run("rev-parse", "--show-toplevel"))
+	root, err := c.clean(c.run("rev-parse", "--show-toplevel"))
+	if err != nil {
+		return "", err
+	}
+	return sanitizePath(root), nil
 }
 
 func (c *Git) GitDir() (string, error) {

util/gitutil/path.go

@@ -0,0 +1,23 @@
+package gitutil
+
+import (
+	"os"
+	"path/filepath"
+	"regexp"
+	"strings"
+)
+
+var windowsPathRegex = regexp.MustCompile(`^[A-Za-z]:[\\/].*$`)
+
+func sanitizePath(path string) string {
+	// If we're running in WSL, we need to convert Windows paths to Unix paths.
+	// This is because the git binary can be invoked through `git.exe` and
+	// therefore returns Windows paths.
+	if os.Getenv("WSL_DISTRO_NAME") != "" && windowsPathRegex.MatchString(path) {
+		unixPath := strings.ReplaceAll(path, "\\", "/")
+		drive := strings.ToLower(string(unixPath[0]))
+		rest := filepath.Clean(unixPath[3:])
+		return filepath.Join("/mnt", drive, rest)
+	}
+	return path
+}

util/gitutil/path_test.go

@@ -0,0 +1,20 @@
+package gitutil
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestSanitizePathUnix(t *testing.T) {
+	assert.Equal(t, "/home/foobar", sanitizePath("/home/foobar"))
+}
+
+func TestSanitizePathWSL(t *testing.T) {
+	t.Setenv("WSL_DISTRO_NAME", "Ubuntu")
+	assert.Equal(t, "/mnt/c/Users/foobar", sanitizePath("C:\\Users\\foobar"))
+}
+
+func TestSanitizePathWindows(t *testing.T) {
+	assert.Equal(t, "C:\\Users\\foobar", sanitizePath("C:\\Users\\foobar"))
+}