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[bug#55577] [PATCH] Check substitute --help or --version options early

From: yarl-baudig
Subject: [bug#55577] [PATCH] Check substitute --help or --version options early
Date: Sun, 22 May 2022 15:54:42 +0200 (CEST)

Running `guix archive --authorize` sets /etc/guix/acl to 600
via with-atomic-file-output via mkstemp!.
Then running `guix substitute --help/--version` fails on "permission denied".
While "guix substitute" is an internal tool, the options --help and --version
exist and you should be able to run those from the command line.

* guix/scripts/substitute.scm: earlier check for --help or --version.
 guix/scripts/substitute.scm | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/guix/scripts/substitute.scm b/guix/scripts/substitute.scm
index 908a8334a8..c5f5d23b47 100755
--- a/guix/scripts/substitute.scm
+++ b/guix/scripts/substitute.scm
@@ -704,6 +704,14 @@ (define-command (guix-substitute . args)
   (category internal)
   (synopsis "implement the build daemon's substituter protocol")
+  (match args
+    ((or ("-V") ("--version"))
+     (show-version-and-exit "guix substitute"))
+    ((or ("-h") ("--help") ())
+     (show-help)
+     (exit 0))
+    (_ #t))
   (define print-build-trace?
     (match (or (find-daemon-option "untrusted-print-extended-build-trace")
                (find-daemon-option "print-extended-build-trace"))
@@ -775,10 +783,6 @@ (define reply-port
-       ((or ("-V") ("--version"))
-        (show-version-and-exit "guix substitute"))
-       ((or ("-h") ("--help"))
-        (show-help))
         (leave (G_ "~a: unrecognized options~%") opts))))))

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