#!/bin/sh

set -e

chrooted() {
# borrowed from udev's postinst
if [ "$(stat -c %d/%i /)" = "$(stat -Lc %d/%i /proc/1/root 2>/dev/null)" ]; then
# the devicenumber/inode pair of / is the same as that of
# /sbin/init's root, so we're *not* in a chroot and hence
# return false.
return 1
fi
return 0
}

case "$1" in
install)
mkdir -p /etc/initramfs-tools/conf.d

# First time install. Can we autodetect the RESUME partition?
if [ -r /proc/swaps ]; then
RESUME=$(tail -n $(($(wc -l /proc/swaps | awk ' { print $1 } ') - 1)) /proc/swaps | sort -rk3 | head -n 1 | awk ' { print $1 } ')
if command -v blkid >/dev/null 2>&1; then
UUID=$(blkid -s UUID -o value "$RESUME" || true)
# FIXME: post-Wheezy remove vol_id invocations
elif command -v vol_id >/dev/null 2>&1; then
UUID=$(vol_id -u "$RESUME" || true)
elif [ -x /lib/udev/vol_id ]; then
UUID=$(/lib/udev/vol_id -u "$RESUME" || true)
fi
if [ -n "$UUID" ]; then
RESUME="UUID=$UUID"
fi
fi

# write conf.d/resume if not in a chroot
if [ -n "${RESUME}" ] && ! chrooted; then
echo "RESUME=${RESUME}" > /etc/initramfs-tools/conf.d/resume
fi

;;
esac