bug#34279: guix-install.sh: uses /bin/bash shebang

[Ludovic Courtès]

Hi,

Claes Wallin (韋嘉誠) <address@hidden> skribis:

> This means ./guix-install.sh doesn't work on e.g. NixOS. :-)
>
> Please use /usr/bin/env bash.

/usr/bin/env wouldn’t work on Guix System by default.  :-)

What about something like this:

diff --git a/etc/guix-install.sh b/etc/guix-install.sh
index 8eb5214049..dc8de2fe92 100755
--- a/etc/guix-install.sh
+++ b/etc/guix-install.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/bin/sh
 # GNU Guix --- Functional package management for GNU
 # Copyright © 2017 sharlatan <address@hidden>
 # Copyright © 2018 Ricardo Wurmus <address@hidden>
@@ -19,6 +19,13 @@
 # You should have received a copy of the GNU General Public License
 # along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.
 
+# We require Bash but for portability we'd rather not use /bin/bash or
+# /usr/bin/env in the shebang, hence this hack.
+if [ "x$BASH_VERSION" = "x" ]
+then
+    exec bash "$0" "$@"
+fi
+
 set -e
 
 [ "$UID" -eq 0 ] || { echo "This script must be run as root."; exit 1; }

Thanks,
Ludo’.