#!/bin/sh -e
#
# Runs update-initramfs(8) to create/update an initramfs for specified
# version (if the pkg that is triggering it) or for the currently
# installed kernel otherwise.
#
# Arguments:	$ACTION = [run/targets]
#		$TARGET = [post-install/post-remove]
#		$PKGNAME
#		$VERSION
#		$UPDATE = [yes/no]
#
ACTION="$1"
TARGET="$2"
PKGNAME="$3"
VERSION="$4"
UPDATE="$5"

update_initramfs=usr/sbin/update-initramfs

case "$ACTION" in
targets)
	echo "post-install post-remove"
	;;
run)
	# Exit if the command cannot be executed.
	[ ! -x ${update_initramfs} ] && exit 0

	# Cannot continue if /proc and /sys not mounted!
	if [ ! -e ./proc/filesystems -a ! -e ./sys/kernel/vmcoreinfo ]; then
		echo "initramfs-tools trigger:"
		echo "WARNING: /proc and /sys (relative to cwd) are not mounted"
		echo "WARNING: cannot continue, exiting..."
		exit 0
	fi

	# Always use relative paths to create the initramfs!
	initramfs_args="-b ./boot"

	if [ "$PKGNAME" = "kernel" ]; then
		if [ "$TARGET" = "post-remove" ]; then
			# Remove the initramfs if removing.
			initramfs_args="$initramfs_args -d -k ${VERSION}"
		fi
		if [ ! -f var/lib/initramfs-tools/${VERSION} ]; then
			# Create new initramfs
			initramfs_args="$initramfs_args -c -t -k ${VERSION}"
		else
			# Update existing initramfs
			initramfs_args="$initramfs_args -B -u -t -k ${VERSION}"
		fi
	else
		# Update initramfs for all kernels
		initramfs_args="$initramfs_args -B -u -t -k all"
	fi

	${update_initramfs} ${initramfs_args}
	exit $?

	;;
*)
	exit 1
	;;
esac

exit 0