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01/02: guix system: Type-check the file or expression.


From: guix-commits
Subject: 01/02: guix system: Type-check the file or expression.
Date: Thu, 16 May 2019 07:35:50 -0400 (EDT)

civodul pushed a commit to branch master
in repository guix.

commit ce10e6053bb02e936b3a0862f3a3f86010b948d0
Author: Ludovic Court├Ęs <address@hidden>
Date:   Wed May 15 22:36:46 2019 +0200

    guix system: Type-check the file or expression.
    
    Previously, users would get a wrong-type-arg exception down the road
    with an intimidating backtrace.
    
    * guix/scripts/system.scm (process-action)[ensure-operating-system]: New
    procedure.
    Use it.
---
 guix/scripts/system.scm | 30 +++++++++++++++++++-----------
 1 file changed, 19 insertions(+), 11 deletions(-)

diff --git a/guix/scripts/system.scm b/guix/scripts/system.scm
index 8434d1e..60c1ca5 100644
--- a/guix/scripts/system.scm
+++ b/guix/scripts/system.scm
@@ -1143,22 +1143,30 @@ Some ACTIONS support additional ARGS.\n"))
 ACTION must be one of the sub-commands that takes an operating system
 declaration as an argument (a file name.)  OPTS is the raw alist of options
 resulting from command-line parsing."
+  (define (ensure-operating-system file-or-exp obj)
+    (unless (operating-system? obj)
+      (leave (G_ "'~a' does not return an operating system~%")
+             file-or-exp))
+    obj)
+
   (let* ((file        (match args
                         (() #f)
                         ((x . _) x)))
          (expr        (assoc-ref opts 'expression))
          (system      (assoc-ref opts 'system))
-         (os          (cond
-                       ((and expr file)
-                        (leave
-                         (G_ "both file and expression cannot be 
specified~%")))
-                       (expr
-                        (read/eval expr))
-                       (file
-                        (load* file %user-module
-                                    #:on-error (assoc-ref opts 'on-error)))
-                       (else
-                        (leave (G_ "no configuration specified~%")))))
+         (os          (ensure-operating-system
+                       (or file expr)
+                       (cond
+                        ((and expr file)
+                         (leave
+                          (G_ "both file and expression cannot be 
specified~%")))
+                        (expr
+                         (read/eval expr))
+                        (file
+                         (load* file %user-module
+                                #:on-error (assoc-ref opts 'on-error)))
+                        (else
+                         (leave (G_ "no configuration specified~%"))))))
 
          (dry?        (assoc-ref opts 'dry-run?))
          (bootloader? (assoc-ref opts 'install-bootloader?))



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