github.com/bugraaydogar/snapd@v0.0.0-20210315170335-8c70bb858939/cmd/snap-mgmt/snap-mgmt.sh.in (about) 1 #!/bin/bash 2 3 # Overlord management of snapd for package manager actions. 4 # Implements actions that would be invoked in %pre(un) actions for snapd. 5 # Derived from the snapd.postrm scriptlet used in the Ubuntu packaging for 6 # snapd. 7 8 set -e 9 set +x 10 11 SNAP_MOUNT_DIR="@SNAP_MOUNT_DIR@" 12 13 show_help() { 14 exec cat <<'EOF' 15 Usage: snap-mgmt.sh [OPTIONS] 16 17 A simple script to cleanup snap installations. 18 19 optional arguments: 20 --help Show this help message and exit 21 --snap-mount-dir=<path> Provide a path to be used as $SNAP_MOUNT_DIR 22 --purge Purge all data from $SNAP_MOUNT_DIR 23 EOF 24 } 25 26 SNAP_UNIT_PREFIX="$(systemd-escape -p ${SNAP_MOUNT_DIR})" 27 28 systemctl_stop() { 29 unit="$1" 30 if systemctl is-active -q "$unit"; then 31 echo "Stopping $unit" 32 systemctl stop -q "$unit" || true 33 fi 34 } 35 36 purge() { 37 # shellcheck disable=SC1091 38 distribution=$(. /etc/os-release; echo "${ID}-${VERSION_ID}") 39 40 if [ "$distribution" = "ubuntu-14.04" ]; then 41 # snap.mount.service is a trusty thing 42 systemctl_stop snap.mount.service 43 fi 44 45 # Undo any bind mounts to ${SNAP_MOUNT_DIR} or /var/snap done by parallel 46 # installs or LP:#1668659 47 for mp in "$SNAP_MOUNT_DIR" /var/snap; do 48 if grep -q " $mp $mp" /proc/self/mountinfo; then 49 umount -l "$mp" || true 50 fi 51 done 52 53 units=$(systemctl list-unit-files --no-legend --full | grep -vF snap.mount.service || true) 54 # *.snap mount points 55 mounts=$(echo "$units" | grep "^${SNAP_UNIT_PREFIX}[-.].*\\.mount" | cut -f1 -d ' ') 56 # services from snaps 57 services=$(echo "$units" | grep '^snap\..*\.service' | cut -f1 -d ' ') 58 for unit in $services $mounts; do 59 # ensure its really a snap mount unit or systemd unit 60 if ! grep -q 'What=/var/lib/snapd/snaps/' "/etc/systemd/system/$unit" && ! grep -q 'X-Snappy=yes' "/etc/systemd/system/$unit"; then 61 echo "Skipping non-snapd systemd unit $unit" 62 continue 63 fi 64 65 echo "Stopping $unit" 66 systemctl_stop "$unit" 67 68 if echo "$unit" | grep -q '.*\.mount' ; then 69 # Transform ${SNAP_MOUNT_DIR}/core/3440 -> core/3440 removing any 70 # extra / preceding snap name, eg: 71 # /var/lib/snapd/snap/core/3440 -> core/3440 72 # /snap/core/3440 -> core/3440 73 # /snap/core//3440 -> core/3440 74 # NOTE: we could have used `systemctl show $unit -p Where --value` 75 # but systemd 204 shipped with Ubuntu 14.04 does not support this 76 snap_rev=$(systemctl show "$unit" -p Where | sed -e 's#Where=##' -e "s#$SNAP_MOUNT_DIR##" -e 's#^/*##') 77 snap=$(echo "$snap_rev" |cut -f1 -d/) 78 rev=$(echo "$snap_rev" |cut -f2 -d/) 79 if [ -n "$snap" ]; then 80 echo "Removing snap $snap" 81 # aliases 82 if [ -d "${SNAP_MOUNT_DIR}/bin" ]; then 83 find "${SNAP_MOUNT_DIR}/bin" -maxdepth 1 -lname "$snap" -delete 84 find "${SNAP_MOUNT_DIR}/bin" -maxdepth 1 -lname "$snap.*" -delete 85 fi 86 # generated binaries 87 rm -f "${SNAP_MOUNT_DIR}/bin/$snap" 88 rm -f "${SNAP_MOUNT_DIR}/bin/$snap".* 89 # snap mount dir 90 umount -l "${SNAP_MOUNT_DIR}/$snap/$rev" 2> /dev/null || true 91 rm -rf "${SNAP_MOUNT_DIR:?}/$snap/$rev" 92 rm -f "${SNAP_MOUNT_DIR}/$snap/current" 93 # snap data dir 94 rm -rf "/var/snap/$snap/$rev" 95 rm -rf "/var/snap/$snap/common" 96 rm -f "/var/snap/$snap/current" 97 # opportunistic remove (may fail if there are still revisions left) 98 for d in "${SNAP_MOUNT_DIR}/$snap" "/var/snap/$snap"; do 99 if [ -d "$d" ]; then 100 rmdir --ignore-fail-on-non-empty "$d" 101 fi 102 done 103 # udev rules 104 find /etc/udev/rules.d -name "*-snap.${snap}.rules" -execdir rm -f "{}" \; 105 # dbus policy files 106 if [ -d /etc/dbus-1/system.d ]; then 107 find /etc/dbus-1/system.d -name "snap.${snap}.*.conf" -execdir rm -f "{}" \; 108 fi 109 # modules 110 rm -f "/etc/modules-load.d/snap.${snap}.conf" 111 # timer and socket units 112 find /etc/systemd/system -name "snap.${snap}.*.timer" -o -name "snap.${snap}.*.socket" | while read -r f; do 113 systemctl_stop "$(basename "$f")" 114 rm -f "$f" 115 done 116 # user services, sockets, and timers - we make no attempt to stop any of them. 117 # TODO: ask snapd to ask each snapd.session-agent.service to stop snaps 118 # user-session services and stop itself. 119 find /etc/systemd/user -name "snap.${snap}.*.timer" -o -name "snap.${snap}.*.socket" -o -name "snap.${snap}.*.service" | while read -r f; do 120 rm -f "$f" 121 done 122 fi 123 fi 124 125 echo "Removing $unit" 126 rm -f "/etc/systemd/system/$unit" 127 rm -f "/etc/systemd/system/multi-user.target.wants/$unit" 128 done 129 130 # snapd session-agent 131 rm -f /etc/systemd/user/snapd.session-agent.socket 132 rm -f /etc/systemd/user/snapd.session-agent.service 133 rm -f /etc/systemd/user/sockets.target.wants/snapd.session-agent.socket 134 135 # dbus activation configuration 136 rm -f /etc/dbus-1/session.d/snapd.session-services.conf 137 rm -f /etc/dbus-1/system.d/snapd.system-services.conf 138 139 echo "Discarding preserved snap namespaces" 140 # opportunistic as those might not be actually mounted 141 if [ -d /run/snapd/ns ]; then 142 if [ "$(find /run/snapd/ns/ -name "*.mnt" | wc -l)" -gt 0 ]; then 143 for mnt in /run/snapd/ns/*.mnt; do 144 umount -l "$mnt" || true 145 rm -f "$mnt" 146 done 147 fi 148 find /run/snapd/ns/ \( -name '*.fstab' -o -name '*.user-fstab' -o -name '*.info' \) -delete 149 umount -l /run/snapd/ns/ || true 150 fi 151 152 echo "Removing downloaded snaps" 153 rm -rf /var/lib/snapd/snaps/* 154 155 echo "Removing features exported from snapd to helper tools" 156 rm -rf /var/lib/snapd/features 157 158 echo "Final directory cleanup" 159 rm -rf "${SNAP_MOUNT_DIR}" 160 rm -rf /var/snap 161 162 echo "Removing leftover snap shared state data" 163 rm -rf /var/lib/snapd/dbus-1/services/* 164 rm -rf /var/lib/snapd/dbus-1/system-services/* 165 rm -rf /var/lib/snapd/desktop/applications/* 166 rm -rf /var/lib/snapd/seccomp/bpf/* 167 rm -rf /var/lib/snapd/device/* 168 rm -rf /var/lib/snapd/assertions/* 169 rm -rf /var/lib/snapd/cookie/* 170 rm -rf /var/lib/snapd/cache/* 171 rm -rf /var/lib/snapd/mount/* 172 rm -rf /var/lib/snapd/sequence/* 173 rm -rf /var/lib/snapd/apparmor/* 174 rm -rf /var/lib/snapd/inhibit/* 175 rm -f /var/lib/snapd/state.json 176 rm -f /var/lib/snapd/system-key 177 178 echo "Removing snapd catalog cache" 179 rm -rf /var/cache/snapd/* 180 181 if test -d /etc/apparmor.d; then 182 # Remove auto-generated rules for snap-confine from the 'core' snap 183 echo "Removing extra snap-confine apparmor rules" 184 # shellcheck disable=SC2046 185 rm -f /etc/apparmor.d/$(echo "$SNAP_UNIT_PREFIX" | tr '-' '.').core.*.usr.lib.snapd.snap-confine 186 fi 187 } 188 189 while [ -n "$1" ]; do 190 case "$1" in 191 --help) 192 show_help 193 exit 194 ;; 195 --snap-mount-dir=*) 196 SNAP_MOUNT_DIR=${1#*=} 197 SNAP_UNIT_PREFIX=$(systemd-escape -p "$SNAP_MOUNT_DIR") 198 shift 199 ;; 200 --purge) 201 purge 202 shift 203 ;; 204 *) 205 echo "Unknown command: $1" 206 exit 1 207 ;; 208 esac 209 done