[bug#45983] [PATCH 3/3] scripts: import: json: Fix error handling.

[zimoun <zimon.toutoune@gmail.com>]

Fixes partially <https://bugs.gnu.org/44115>.

* guix/scripts/import/json.scm (guix-import-json): Handle error.
---
 guix/scripts/import/json.scm | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/guix/scripts/import/json.scm b/guix/scripts/import/json.scm
index 778e5f4bc5..63fba260ae 100644
--- a/guix/scripts/import/json.scm
+++ b/guix/scripts/import/json.scm
@@ -1,6 +1,7 @@
 ;;; GNU Guix --- Functional package management for GNU
 ;;; Copyright © 2014 Eric Bavier <bavier@member.fsf.org>
 ;;; Copyright © 2015, 2017 Ricardo Wurmus <rekado@elephly.net>
+;;; Copyright © 2021 Simon Tournier <zimon.toutoune@gmail.com>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -88,8 +89,10 @@ Import and convert the JSON package definition in PACKAGE-FILE.\n"))
                            (reverse opts))))
     (match args
       ((file-name)
-       (or (json->code file-name)
-           (leave (G_ "invalid JSON in file '~a'~%") file-name)))
+       (if (file-exists? file-name)
+         (or (json->code file-name)
+             (leave (G_ "invalid JSON in file '~a'~%") file-name))
+         (leave (G_ "invalid file name~%"))))
       (()
        (leave (G_ "too few arguments~%")))
       ((many ...)
-- 
2.29.2