#!/bin/sh

set -e

systemctl_stop() {
    unit="$1"
    if systemctl is-active -q "$unit"; then
        echo "Stoping $unit"
        systemctl stop -q "$unit" || true
    fi
}

if [ "$1" = "purge" ]; then
    mounts=$(systemctl list-unit-files | grep '^snap[-.].*\.mount' | cut -f1 -d ' ')
    services=$(systemctl list-unit-files | grep '^snap[-.].*\.service' | cut -f1 -d ' ')
    for unit in $services $mounts; do
        # ensure its really a snapp mount unit or systemd unit
        if ! grep -q 'What=/var/lib/snapd/snaps/' "/etc/systemd/system/$unit" && ! grep -q 'X-Snappy=yes' "/etc/systemd/system/$unit"; then
            echo "Skipping non-snapd systemd unit $unit"
            continue
        fi

        echo "Stopping $unit"
        systemctl_stop "$unit"

        # if it is a mount unit, we can find the snap name in the mount
        # unit (we just ignore unit files)
        snap=$(grep 'Where=/snap/' "/etc/systemd/system/$unit"|cut -f3 -d/)
        rev=$(grep 'Where=/snap/' "/etc/systemd/system/$unit"|cut -f4 -d/)
        if [ -n "$snap" ]; then
            echo "Removing snap $snap"
            # generated binaries
            rm -f "/snap/bin/$snap"
            rm -f "/snap/bin/$snap".*
            # snap mount dir
            umount -l "/snap/$snap/$rev" 2> /dev/null || true
            rm -rf "/snap/$snap/$rev"
            rm -f "/snap/$snap/current"
            # snap data dir
            rm -rf "/var/snap/$snap/$rev"
            rm -rf "/var/snap/$snap/common"
            rm -f "/var/snap/$snap/current"
            # opportunistic remove (may fail if there are still revisions left
            for d in "/snap/bin" "/snap/$snap" "/var/snap/$snap" "/snap" "/var/snap"; do
                if [ -d "$d" ]; then
                    rmdir --ignore-fail-on-non-empty $d
                fi
            done
        fi

        echo "Removing $unit"
        rm -f "/etc/systemd/system/$unit"
        rm -f "/etc/systemd/system/multi-user.target.wants/$unit"
    done

    echo "Discarding preserved snap namespaces"
    # opportunistic as those might not be actually mounted
    for mnt in /run/snapd/ns/*.mnt; do
        umount -l "$mnt" || true
    done
    umount -l /run/snapd/ns/ || true

    echo "Removing snapd state"
    rm -rf /var/lib/snapd
fi

# Automatically added by dh_installdeb
dpkg-maintscript-helper rm_conffile /etc/ld.so.conf.d/snappy.conf 2.0.7~ -- "$@"
# End automatically added section
# Automatically added by dh_installdeb
dpkg-maintscript-helper rm_conffile /etc/grub.d/09_snappy 1.7.3ubuntu1 -- "$@"
# End automatically added section
# Automatically added by dh_systemd_start
if [ -d /run/systemd/system ]; then
	systemctl --system daemon-reload >/dev/null || true
fi
# End automatically added section
# Automatically added by dh_systemd_start
if [ -d /run/systemd/system ]; then
	systemctl --system daemon-reload >/dev/null || true
fi
# End automatically added section
# Automatically added by dh_systemd_start
if [ -d /run/systemd/system ]; then
	systemctl --system daemon-reload >/dev/null || true
fi
# End automatically added section
# Automatically added by dh_systemd_start
if [ -d /run/systemd/system ]; then
	systemctl --system daemon-reload >/dev/null || true
fi
# End automatically added section
# Automatically added by dh_systemd_start
if [ -d /run/systemd/system ]; then
	systemctl --system daemon-reload >/dev/null || true
fi
# End automatically added section
# Automatically added by dh_installinit
if [ "$1" = "purge" ] ; then
	update-rc.d snapd remove >/dev/null
fi


# In case this system is running systemd, we make systemd reload the unit files
# to pick up changes.
if [ -d /run/systemd/system ] ; then
	systemctl --system daemon-reload >/dev/null || true
fi
# End automatically added section
# Automatically added by dh_systemd_enable
if [ "$1" = "remove" ]; then
	if [ -x "/usr/bin/deb-systemd-helper" ]; then
		deb-systemd-helper mask snapd.service >/dev/null
	fi
fi

if [ "$1" = "purge" ]; then
	if [ -x "/usr/bin/deb-systemd-helper" ]; then
		deb-systemd-helper purge snapd.service >/dev/null
		deb-systemd-helper unmask snapd.service >/dev/null
	fi
fi
# End automatically added section
# Automatically added by dh_systemd_enable
if [ "$1" = "remove" ]; then
	if [ -x "/usr/bin/deb-systemd-helper" ]; then
		deb-systemd-helper mask snapd.socket >/dev/null
	fi
fi

if [ "$1" = "purge" ]; then
	if [ -x "/usr/bin/deb-systemd-helper" ]; then
		deb-systemd-helper purge snapd.socket >/dev/null
		deb-systemd-helper unmask snapd.socket >/dev/null
	fi
fi
# End automatically added section
# Automatically added by dh_systemd_enable
if [ "$1" = "remove" ]; then
	if [ -x "/usr/bin/deb-systemd-helper" ]; then
		deb-systemd-helper mask snapd.refresh.timer >/dev/null
	fi
fi

if [ "$1" = "purge" ]; then
	if [ -x "/usr/bin/deb-systemd-helper" ]; then
		deb-systemd-helper purge snapd.refresh.timer >/dev/null
		deb-systemd-helper unmask snapd.refresh.timer >/dev/null
	fi
fi
# End automatically added section
# Automatically added by dh_systemd_enable
if [ "$1" = "remove" ]; then
	if [ -x "/usr/bin/deb-systemd-helper" ]; then
		deb-systemd-helper mask snapd.autoimport.service >/dev/null
	fi
fi

if [ "$1" = "purge" ]; then
	if [ -x "/usr/bin/deb-systemd-helper" ]; then
		deb-systemd-helper purge snapd.autoimport.service >/dev/null
		deb-systemd-helper unmask snapd.autoimport.service >/dev/null
	fi
fi
# End automatically added section