X-Git-Url: https://git.arvados.org/arvados.git/blobdiff_plain/c02ceff00fce94ec5794b53fe890f681acf31121..cdaca3963cf2d07e81eb71ac33e4c0966dec9b93:/lib/cli/external.go

diff --git a/lib/cli/external.go b/lib/cli/external.go
index ba85aae9ea..35933f99fc 100644
--- a/lib/cli/external.go
+++ b/lib/cli/external.go
@@ -92,8 +92,33 @@ func (ec externalCmd) RunCommand(prog string, args []string, stdin io.Reader, st
 		}
 		fmt.Fprintf(stderr, "%s failed: %s\n", ec.prog, err)
 		return 1
+	case *exec.Error:
+		fmt.Fprintln(stderr, err)
+		if ec.prog == "arv" || ec.prog == "arv-run-pipeline-instance" {
+			fmt.Fprint(stderr, rubyInstallHints)
+		} else if strings.HasPrefix(ec.prog, "arv-") {
+			fmt.Fprint(stderr, pythonInstallHints)
+		}
+		return 1
 	default:
 		fmt.Fprintf(stderr, "error running %s: %s\n", ec.prog, err)
 		return 1
 	}
 }
+
+var (
+	rubyInstallHints = `
+Note: This subcommand uses the arvados-cli Ruby gem. If that is not
+installed, try "gem install arvados-cli", or see
+https://doc.arvados.org/install for more details.
+
+`
+	pythonInstallHints = `
+Note: This subcommand uses the "arvados" Python module. If that is
+not installed, try:
+* "pip install arvados" (either as root or in a virtualenv), or
+* "sudo apt-get install python-arvados-python-client", or
+* see https://doc.arvados.org/install for more details.
+
+`
+)