-#!/bin/bash -x
+#!/bin/bash
# Set grub to boot into a different distro, and reboot unless -r
-# $0 DISTRO_NAME
+# $0 [DISTRO_NAME]
+# with no argument, print available distros
# DISTRO_NAME is based on the partition names in /boot. eg boot_debianjessie
set -eE -o pipefail
-trap 'echo "$0:$LINENO:error: \"$BASH_COMMAND\" returned $?"' ERR
+trap 'echo "$0:$LINENO:error: \"$BASH_COMMAND\" returned $?" >&2' ERR
[[ $EUID == 0 ]] || exec sudo "$BASH_SOURCE" "$@"
+
+###### begin command line parsing #####
reboot=true
while [[ $1 == -* ]]; do
case $1 in
+ -d) set -x; shift ;;
-r) reboot=false; shift ;;
--) break ;;
esac
distro=$1
+if [[ ! $distro ]]; then
+ echo "available distros:"
+ btrfs subvolume list /boot | sed -rn 's/^.*boot_(.*)/\1/p'
+ exit 0
+fi
+
###### end command line parsing #####
+
+#### begin initial error checking #####
+
if ! btrfs subvolume list /boot | grep "_$distro$" &>/dev/null; then
echo "$0: error: _$distro$ not found in btrfs subvolume list /boot:"
btrfs subvolume list /boot
exit 1
fi
+#### end initial error checking #####
+
e() { echo "$@"; "$@"; }
boot_dev=$(mount | sed -rn "s#^(\S+) on /boot .*#\1#p")
e umount $mount_point
e rmdir $mount_point
+
+if $reboot; then
+ touch /tmp/keyscript-off
+ reboot now
+fi