main/syslinux: make trigger not fail on lxc

on lxc we dont have the boot device available so extlinux will fail.
We cannot check for `openrc --sys` because apk run the trigger in chroot
and grsecurity will prevent openrc access /proc/1/environment.

So we simply add a --warn-only option and use that from trigger.

1 files changed, 32 insertions, 3 deletions

diff --git a/main/syslinux/update-extlinux b/main/syslinux/update-extlinux
index 2efb7cb6f4..10e2feb5b0 100755
--- a/main/syslinux/update-extlinux
+++ b/main/syslinux/update-extlinux
@@ -30,6 +30,30 @@ eerror() {
 	return 1
 }
 
+usage() {
+	echo "usage: $0 [-v|--verbose] [--warn-only]"
+}
+
+while [ $# -gt 0 ]; do
+	opt="$1"
+	shift
+	case "$opt" in
+	-v|--verbose)
+		verbose=1
+		;;
+	--warn-only)
+		warn_only=1
+		;;
+	--)
+		break
+		;;
+	-*)
+		usage
+		exit 1
+		;;
+	esac
+done
+
 everbose "Updating extlinux configuration."
 
 if [ "x$root" = "x" ]; then
@@ -50,8 +74,13 @@ if [ "x$root" = "x" ]; then
 	fi
 	if [ -z "$UUID" ]; then
 		if [ -z "$dev" ]; then
-			eerror "Failed to detect root device"
-			exit 1
+			if [ -n "$warn_only" ]; then
+				ewarn "Failed to detect root device. extlinux.conf is not updated"
+				exit 0
+			else
+				eerror "Failed to detect root device"
+				exit 1
+			fi
 		else
 			root=$dev
 		fi
@@ -218,6 +247,6 @@ cp /usr/share/syslinux/libutil.c32 \
 	/boot
 
 case "$(stat -f -c '%T' /boot)" in
-ext*) extlinux --update /boot;;
+ext*) extlinux --update /boot || [ -n "$warn_only" ];;
 esac