user/grub: add trigger to auto-update configuration

1 files changed, 38 insertions, 0 deletions

diff --git a/user/grub/grub.post-upgrade b/user/grub/grub.post-upgrade
new file mode 100644
index 000000000..5b9cbb072
--- /dev/null
+++ b/user/grub/grub.post-upgrade
@@ -0,0 +1,38 @@
+#!/bin/sh -e
+ver_new="$1"
+ver_old="$2"
+
+if [ "$(apk version -t "$ver_old" "2.02-r8")" = "<" ]; then
+	cat >&2 <<-EOF
+	*
+	* Starting with grub=2.02-r8, /boot/grub/grub.cfg is now automatically
+	* regenerated when easy-kernel is upgraded.
+	*
+	EOF
+	if ! grep -Fqx '# DO NOT EDIT THIS FILE' /boot/grub/grub.cfg; then
+		cat >&2 <<-EOF
+		* It appears that you have a manual GRUB configuration.
+		* If this is incorrect, comment out ADELIE_MANUAL_CONFIG
+		* in /etc/default/grub. When this option is set, /boot/grub/grub.cfg
+		* will *not* be automatically regenerated.
+		*
+		EOF
+
+		cat >> /etc/default/grub <<-EOF
+		# Uncomment the following line if you do *not* want /boot/grub/grub.cfg to be
+		# automatically regenerated when easy-kernel is upgraded.
+		ADELIE_MANUAL_CONFIG=1
+		EOF
+	else
+		cat >&2 <<-EOF
+		* It appears that you have a default GRUB configuration.
+		* If this is incorrect, uncomment ADELIE_MANUAL_CONFIG=1
+		* in /etc/default/grub. When this option is set, /boot/grub/grub.cfg
+		* will *not* be automatically regenerated.
+		*
+		* A copy of the existing configuration will be saved as
+		* /boot/grub/grub.cfg.update-grub-old.
+		*
+		EOF
+	fi
+fi