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Mini Shell
Mini Shell
#!/bin/bash
# Overlord management of snapd for package manager actions.
# Implements actions that would be invoked in %pre(un) actions for snapd.
# Derived from the snapd.postrm scriptlet used in the Ubuntu packaging for
# snapd.
set -e
set +x
SNAP_MOUNT_DIR="/snap"
show_help() {
exec cat <<'EOF'
Usage: snap-mgmt.sh [OPTIONS]
A simple script to cleanup snap installations.
optional arguments:
--help Show this help message and exit
--snap-mount-dir=<path> Provide a path to be used as $SNAP_MOUNT_DIR
--purge Purge all data from $SNAP_MOUNT_DIR
EOF
}
SNAP_UNIT_PREFIX="$(systemd-escape -p ${SNAP_MOUNT_DIR})"
systemctl_stop() {
unit="$1"
echo "Stopping unit $unit"
systemctl stop -q "$unit" || true
for i in $(seq 10); do
echo "Waiting until unit $unit is stopped [attempt $i]"
if ! systemctl is-active -q "$unit"; then
echo "$unit is stopped."
return
fi
sleep .5
done
}
purge() {
# shellcheck disable=SC1091
distribution=$(. /etc/os-release; echo "${ID}-${VERSION_ID}")
if [ "$distribution" = "ubuntu-14.04" ]; then
# snap.mount.service is a trusty thing
systemctl_stop snap.mount.service
fi
units=$(systemctl list-unit-files --no-legend --full | grep -vF snap.mount.service || true)
# *.snap mount points
mounts=$(echo "$units" | grep "^${SNAP_UNIT_PREFIX}[-.].*\\.mount" | cut -f1 -d ' ')
# services from snaps
services=$(echo "$units" | grep '^snap\..*\.service' | cut -f1 -d ' ')
# slices from snaps
slices=$(echo "$units" | grep '^snap\..*\.slice' | cut -f1 -d ' ')
for unit in $services $mounts $slices; do
# ensure its really a snap mount unit or systemd unit
if ! grep -q 'What=/var/lib/snapd/snaps/' "/etc/systemd/system/$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 echo "$unit" | grep -q '.*\.mount' ; then
# Transform ${SNAP_MOUNT_DIR}/core/3440 -> core/3440 removing any
# extra / preceding snap name, eg:
# /var/lib/snapd/snap/core/3440 -> core/3440
# /snap/core/3440 -> core/3440
# /snap/core//3440 -> core/3440
# NOTE: we could have used `systemctl show $unit -p Where --value`
# but systemd 204 shipped with Ubuntu 14.04 does not support this
snap_rev=$(systemctl show "$unit" -p Where | sed -e 's#Where=##' -e "s#$SNAP_MOUNT_DIR##" -e 's#^/*##')
snap=$(echo "$snap_rev" |cut -f1 -d/)
rev=$(echo "$snap_rev" |cut -f2 -d/)
if [ -n "$snap" ]; then
echo "Removing snap $snap"
# aliases
if [ -d "${SNAP_MOUNT_DIR}/bin" ]; then
find "${SNAP_MOUNT_DIR}/bin" -maxdepth 1 -lname "$snap" -delete
find "${SNAP_MOUNT_DIR}/bin" -maxdepth 1 -lname "$snap.*" -delete
fi
# generated binaries
rm -f "${SNAP_MOUNT_DIR}/bin/$snap"
rm -f "${SNAP_MOUNT_DIR}/bin/$snap".*
# snap mount dir
umount -l "${SNAP_MOUNT_DIR}/$snap/$rev" 2> /dev/null || true
rm -rf "${SNAP_MOUNT_DIR:?}/$snap/$rev"
rm -f "${SNAP_MOUNT_DIR}/$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 "${SNAP_MOUNT_DIR}/$snap" "/var/snap/$snap"; do
if [ -d "$d" ]; then
rmdir --ignore-fail-on-non-empty "$d"
fi
done
# udev rules
find /etc/udev/rules.d -name "*-snap.${snap}.rules" -execdir rm -f "{}" \;
# dbus policy files
if [ -d /etc/dbus-1/system.d ]; then
find /etc/dbus-1/system.d -name "snap.${snap}.*.conf" -execdir rm -f "{}" \;
fi
# modules
rm -f "/etc/modules-load.d/snap.${snap}.conf"
rm -f "/etc/modprobe.d/snap.${snap}.conf"
# timer and socket units
find /etc/systemd/system -name "snap.${snap}.*.timer" -o -name "snap.${snap}.*.socket" | while read -r f; do
systemctl_stop "$(basename "$f")"
rm -f "$f"
done
# user services, sockets, and timers - we make no attempt to stop any of them.
# TODO: ask snapd to ask each snapd.session-agent.service to stop snaps
# user-session services and stop itself.
find /etc/systemd/user -name "snap.${snap}.*.timer" -o -name "snap.${snap}.*.socket" -o -name "snap.${snap}.*.service" | while read -r f; do
rm -f "$f"
done
fi
fi
echo "Removing $unit"
rm -f "/etc/systemd/system/$unit"
rm -f "/etc/systemd/system/multi-user.target.wants/$unit"
rm -f "/etc/systemd/system/snapd.mounts.target.wants/${unit}"
done
# Remove empty ".wants/" directory created by enabling mount units
rmdir "/etc/systemd/system/snapd.mounts.target.wants" || true
# Units may have been removed do a reload
systemctl -q daemon-reload || true
# Undo any bind mounts to ${SNAP_MOUNT_DIR} or /var/snap done by parallel
# installs or LP:#1668659
for mp in "$SNAP_MOUNT_DIR" /var/snap; do
# btrfs bind mounts actually include subvolume in the filesystem-path
# https://www.mail-archive.com/linux-btrfs@vger.kernel.org/msg51810.html
if grep -q " $mp $mp " /proc/self/mountinfo ||
grep -q -e "\(/.*\)$mp $mp .* btrfs .*\(subvol=\1\)\(,.*\)\?\$" /proc/self/mountinfo ; then
echo "umounting $mp"
umount -l "$mp" || true
fi
done
# stop snapd services
for serv in snapd.autoimport.service snapd.seeded.service snapd.apparmor.service snapd.mounts.target snapd.mounts-pre.target; do
systemctl_stop "$serv"
done
# snapd session-agent
rm -f /etc/systemd/user/snapd.session-agent.socket
rm -f /etc/systemd/user/snapd.session-agent.service
rm -f /etc/systemd/user/sockets.target.wants/snapd.session-agent.socket
# dbus activation configuration
rm -f /etc/dbus-1/session.d/snapd.session-services.conf
rm -f /etc/dbus-1/system.d/snapd.system-services.conf
echo "Discarding preserved snap namespaces"
# opportunistic as those might not be actually mounted
if [ -d /run/snapd/ns ]; then
if [ "$(find /run/snapd/ns/ -name "*.mnt" | wc -l)" -gt 0 ]; then
for mnt in /run/snapd/ns/*.mnt; do
umount -l "$mnt" || true
rm -f "$mnt"
done
fi
find /run/snapd/ns/ \( -name '*.fstab' -o -name '*.user-fstab' -o -name '*.info' \) -delete
umount -l /run/snapd/ns/ || true
fi
echo "Removing downloaded snaps"
rm -rf /var/lib/snapd/snaps/*
echo "Removing features exported from snapd to helper tools"
rm -rf /var/lib/snapd/features
echo "Final directory cleanup"
rm -rf "${SNAP_MOUNT_DIR}"
rm -rf /var/snap
echo "Removing leftover snap shared state data"
rm -rf /var/lib/snapd/dbus-1/services/*
rm -rf /var/lib/snapd/dbus-1/system-services/*
rm -rf /var/lib/snapd/desktop/applications/*
rm -rf /var/lib/snapd/environment/*
rm -rf /var/lib/snapd/seccomp/bpf/*
rm -rf /var/lib/snapd/device/*
rm -rf /var/lib/snapd/assertions/*
rm -rf /var/lib/snapd/cookie/*
rm -rf /var/lib/snapd/cache/*
rm -rf /var/lib/snapd/mount/*
rm -rf /var/lib/snapd/sequence/*
rm -rf /var/lib/snapd/apparmor/*
rm -rf /var/lib/snapd/inhibit/*
rm -rf /var/lib/snapd/cgroup/*
rm -f /var/lib/snapd/state.json
rm -f /var/lib/snapd/system-key
echo "Removing snapd catalog cache"
rm -rf /var/cache/snapd/*
if test -d /etc/apparmor.d; then
# Remove auto-generated rules for snap-confine from the 'core' snap
echo "Removing extra snap-confine apparmor rules"
# shellcheck disable=SC2046
rm -f /etc/apparmor.d/$(echo "$SNAP_UNIT_PREFIX" | tr '-' '.').core.*.usr.lib.snapd.snap-confine
fi
}
while [ -n "$1" ]; do
case "$1" in
--help)
show_help
exit
;;
--snap-mount-dir=*)
SNAP_MOUNT_DIR=${1#*=}
SNAP_UNIT_PREFIX=$(systemd-escape -p "$SNAP_MOUNT_DIR")
shift
;;
--purge)
purge
shift
;;
*)
echo "Unknown command: $1"
exit 1
;;
esac
done
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