[bug#40601] [PATCH 1/5] guix-install.sh: Remove "[[" bashisms in chk_init_sys().

[Vincent Legoll]

* etc/guix-install.sh (chk_init_sys): Use `if something | grep' instead of "[["
pattern matching.
---
 etc/guix-install.sh | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/etc/guix-install.sh b/etc/guix-install.sh
index 9015f40bb6..26c8622855 100755
--- a/etc/guix-install.sh
+++ b/etc/guix-install.sh
@@ -143,11 +143,11 @@ chk_term()
 
 chk_init_sys()
 { # Return init system type name.
-    if [[ $(/sbin/init --version 2>/dev/null) =~ upstart ]]; then
+    if /sbin/init --version 2>/dev/null | grep -q upstart; then
         _msg "${INF}init system is: upstart"
         INIT_SYS="upstart"
         return 0
-    elif [[ $(systemctl 2>/dev/null) =~ -\.mount ]]; then
+    elif systemctl 2>/dev/null | grep -q -- -\.mount; then
         _msg "${INF}init system is: systemd"
         INIT_SYS="systemd"
         return 0
-- 
2.29.2