Add git repo handling to default workspace path

Author: stuartleeks

internal/pkg/devcontainers/remoteuri.go

@@ -8,6 +8,7 @@ import (
 	"regexp"
 	"strings"
 
+	"github.com/stuartleeks/devcontainer-cli/internal/pkg/git"
 	"github.com/stuartleeks/devcontainer-cli/internal/pkg/wsl"
 )
 
@@ -72,8 +73,11 @@ func GetWorkspaceMountPath(folderPath string) (string, error) {
 	}
 
 	// No `workspaceFolder` found in devcontainer.json - use default
-	_, folderName := filepath.Split(folderPath)
-	return fmt.Sprintf("/workspaces/%s", folderName), nil
+	devcontainerPath, err := getDefaultWorkspaceFolderForPath(folderPath)
+	if err != nil {
+		return "", fmt.Errorf("Error getting default workspace path: %s", err)
+	}
+	return fmt.Sprintf("/workspaces/%s", devcontainerPath), nil
 }
 
 // TODO: add tests (and implementation) to handle JSON parsing with comments
@@ -92,3 +96,26 @@ func getWorkspaceMountPathFromDevcontainerDefinition(definition []byte) (string,
 	}
 	return "", nil
 }
+
+func getDefaultWorkspaceFolderForPath(path string) (string, error) {
+
+	// get the git repo-root
+	rootPath, err := git.GetTopLevelPath(path)
+	if err != nil {
+		return "", err
+	}
+	if rootPath == "" {
+		// not a git repo, default to path
+		rootPath = path
+	}
+
+	// get parent to root
+	rootParent, _ := filepath.Split(rootPath)
+
+	// return path relative to rootParent
+	relativePath, err := filepath.Rel(rootParent, path)
+	if err != nil {
+		return "", err
+	}
+	return relativePath, nil
+}

internal/pkg/git/git.go

@@ -0,0 +1,29 @@
+package git
+
+import (
+	"fmt"
+	"os/exec"
+	"strings"
+	"syscall"
+)
+
+// GetTopLevelPath returns the top-level folder for the git-repo that contains path, or empty string if not a repo
+func GetTopLevelPath(path string) (string, error) {
+	cmd := exec.Command("git", "rev-parse", "--show-toplevel")
+
+	buf, err := cmd.Output()
+	if err != nil {
+		if exiterr, ok := err.(*exec.ExitError); ok {
+			// The program has exited with an exit code != 0
+			if status, ok := exiterr.Sys().(syscall.WaitStatus); ok {
+				if status.ExitStatus() == 128 {
+					// exit code 128 indictates not a git repo
+					return "", nil
+				}
+			}
+			return "", fmt.Errorf("Error git rev-parse --show-toplevel: %s", err)
+		}
+		return "", fmt.Errorf("Error git rev-parse --show-toplevel: %s", err)
+	}
+	return strings.TrimSpace(string(buf)), nil
+}