/
lxc-destroy.in
195 lines (172 loc) · 5.21 KB
/
lxc-destroy.in
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#!/bin/sh
#
# lxc: linux Container library
# Authors:
# Daniel Lezcano <daniel.lezcano@free.fr>
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
#
# This script allows to set or remove the capabilities on the lxc tools.
# When the capabilities are set, a non root user can manage the containers.
#
usage() {
echo "usage: $(basename $0) -n NAME [-f] [-P lxcpath]" >&2
}
help() {
usage
echo >&2
echo "Remove an existing container on the system." >&2
echo >&2
echo "Options:" >&2
echo " -n NAME specify the name of the container" >&2
echo " -f stop the container if it is running (rather than abort)" >&2
echo " -P lxcpath container is in specified lxcpath" >&2
}
. @DATADIR@/lxc/lxc.functions
usage_err() {
[ -n "$1" ] && echo "$1" >&2
usage
exit 1
}
verify_zfs() {
local path=$1
which zfs > /dev/null 2>&1 || { echo no; return; }
if zfs list -H $path >/dev/null 2>&1; then
echo zfs
else
echo no
fi
}
busy_zfs() {
local path=$1
local dev
dev=`zfs list -H $path 2>/dev/null | awk '{ print $1 }'`
if zfs list -t snapshot | grep -q "$dev"; then
echo busy
else
echo zfs
fi
}
verify_lvm() {
local path=$1
if [ -b $path -o -h $path ]; then
lvdisplay $path > /dev/null 2>&1 && { echo lvm; return; }
fi
echo no
}
busy_lvm() {
local path=$1
lvdisplay $path | grep -q "LV snapshot status.*source of" && { echo busy; return; }
echo lvm
}
optarg_check() {
if [ -z "$2" ]; then
usage_err "option '$1' requires an argument"
fi
}
force=0
while [ $# -gt 0 ]; do
opt="$1"
shift
case "$opt" in
-h|--help)
help
exit 1
;;
-n|--name)
optarg_check "$opt" "$1"
lxc_name=$1
shift
;;
-P|--lxcpath)
optarg_check "$opt" "$1"
lxc_path=$1
shift
;;
-f)
force=1
;;
--)
break
;;
-?)
usage_err "unknown option '$opt'"
;;
-*)
# split opts -abc into -a -b -c
set -- $(echo "${opt#-}" | sed 's/\(.\)/ -\1/g') "$@"
;;
*)
usage
exit 1
;;
esac
done
if [ -z "$lxc_name" ]; then
echo "$(basename $0): no container name specified" >&2
usage $0
exit 1
fi
if [ "$(id -u)" != "0" ]; then
echo "$(basename $0): must be run as root" >&2
exit 1
fi
if [ ! -d "$lxc_path/$lxc_name" ]; then
echo "$(basename $0): '$lxc_name' does not exist" >&2
exit 1
fi
# make sure the container is stopped
if ! lxc-info -n $lxc_name -P $lxc_path --state-is "STOPPED"; then
if [ $force -eq 1 ]; then
lxc-stop -P $lxc_path -n $lxc_name
lxc-wait -P $lxc_path -n $lxc_name -s STOPPED
else
echo "$(basename $0): '$lxc_name' $(lxc-info -P $lxc_path -n $lxc_name -s); aborted" >&2
exit 1
fi
fi
# Deduce the type of rootfs
# If LVM partition, destroy it. For btrfs, we delete the subvolume. If anything
# else, ignore it. We'll support deletion of others later.
rootdev=`grep '^\s*lxc\.rootfs' $lxc_path/$lxc_name/config 2>/dev/null | sed -e 's/^[^/]*//'`
if [ -n "$rootdev" ]; then
if [ `verify_lvm $rootdev` = "lvm" ]; then
if [ `busy_lvm $rootdev` = "busy" ]; then
echo "$rootdev has lvm snapshots - not deleting"
exit 1
else
echo "removing backing store: $rootdev"
lvremove -f $rootdev
fi
elif [ `verify_zfs $rootdev` = "zfs" ]; then
if [ `busy_zfs $rootdev` = "busy" ]; then
echo "$rootdev has zfs snapshots - not deleting"
exit 1
else
zfs destroy $(zfs list | grep $rootdev | awk '{ print $1 }')
if [ $? -ne 0 ]; then
echo "zfs destroy failed - please wait a bit and try again"
exit 1
fi
fi
elif [ -h "$rootdev" -o -d "$rootdev" ]; then
if which btrfs >/dev/null 2>&1 &&
btrfs subvolume list "$rootdev" >/dev/null 2>&1; then
btrfs subvolume delete "$rootdev"
else
# In case rootfs is not under $lxc_path/$lxc_name, remove it
rm -rf --one-file-system --preserve-root $rootdev
fi
fi
fi
# recursively remove the container to remove old container configuration
rm -rf --one-file-system --preserve-root $lxc_path/$lxc_name