fix: improved error messages for common problems with the script

cmd/run.go

@@ -132,7 +132,10 @@ func run(cmd *cobra.Command, args []string) error {
 	}
 	executablePath, err := exec.LookPath(parsedCommand[0])
 	if err != nil {
-		return fmt.Errorf("could not find executable %s", parsedCommand[0])
+		if _, err := os.Stat(parsedCommand[0]); os.IsNotExist(err) {
+			return fmt.Errorf("could not find executable %s", parsedCommand[0])
+		}
+		return fmt.Errorf("could not find executable %s, does it have executable privileges?", parsedCommand[0])
 	}
 	// Executable needs to be defined with an absolute path since it will be run within the context of repositories
 	if !filepath.IsAbs(executablePath) {

internal/multigitter/print.go

@@ -101,7 +101,7 @@ func (r Printer) runSingleRepo(ctx context.Context, repo domain.Repository) erro
 
 	err = cmd.Run()
 	if err != nil {
-		return err
+		return transformExecError(err)
 	}
 
 	return nil

internal/multigitter/run.go

@@ -197,7 +197,7 @@ func (r Runner) runSingleRepo(ctx context.Context, repo domain.Repository) (doma
 
 	err = cmd.Run()
 	if err != nil {
-		return nil, err
+		return nil, transformExecError(err)
 	}
 
 	if changed, err := sourceController.Changes(); err != nil {

internal/multigitter/shared.go

@@ -1,5 +1,21 @@
 package multigitter
 
+import (
+	"syscall"
+
+	"github.com/pkg/errors"
+)
+
 type urler interface {
 	URL() string
 }
+
+func transformExecError(err error) error {
+	var sysErr syscall.Errno
+	if ok := errors.As(err, &sysErr); ok {
+		if sysErr.Error() == "exec format error" {
+			return errors.New("the script or program is in the wrong format")
+		}
+	}
+	return err
+}