/etc/chiark-backup/snap/remount is in chiark-backup 4.4.2build1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 | #!/bin/sh
set -e
removes () {
rm -f -- "$vardir/snap-mount" "$vardir/snap-device"
}
vardir="$2"
case "$#.$1" in
2.drop)
fs="$(readlink "$vardir/snap-mount")"
removes
mount -vo remount,rw "$fs" || true
;;
4.snap)
removes
mount -vo remount,ro "$4"
ln -s -- "$3" "$vardir/snap-device"
ln -s -- "$4" "$vardir/snap-mount"
;;
*)
cat >&2 <<'END'
usage: .../remount snap VARDIR DEV MOUNT
.../remount drop VARDIR
END
exit 1
;;
esac
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