libvirt/examples/lxcconvert/virt-lxc-convert

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#!/bin/sh
# lxc_native.c: LXC native configuration import
#
# Copyright (c) 2014 SUSE LINUX Products GmbH, Nuernberg, Germany.
#
# 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, see
# <http://www.gnu.org/licenses/>.
#
handler_cleanup()
{
if test "$conf_dir"; then
# Remove the temporary config
rm -r "$conf_dir"
fi
}
trap handler_cleanup INT EXIT
show_help()
{
cat << EOF
$0 /path/to/lxc/config/file
Wrapper around virsh domxml-from-native to ease conversion of LXC
containers configuration to libvirt domain XML.
EOF
}
if test $# != 1; then
show_help
exit 1
fi
if test "$1" = "--help" || test "$1" = "-h"; then
show_help
exit $?
fi
conf=$1
conf_dir=$(mktemp --tmpdir -d virt-lxc-convert-XXX)
conf_new=$conf_dir/config
cp "$conf" "$conf_new"
# Do we have lxc.mount, and is it pointing to a readable file?
fstab=$(sed -n '/lxc.mount[[:space:]]*=/ s/[[:space:]]*=[[:space:]]*/=/p' \
"$conf_new" | cut -f 2 -d '=')
if test -r "$fstab"; then
sed 's/^lxc.mount[[:space:]]*=.*$//' "$conf_new" >"${conf_new}.tmp"
mv "${conf_new}.tmp" "${conf_new}"
sed 's/^\([^#]\)/lxc.mount.entry = \1/' "$fstab" >>"${conf_new}"
fi
memory=$(free -b | sed -n '/Mem:/s/ \+/ /gp' | cut -f 2 -d ' ')
default_tmpfs="size=$((memory/2))"
# Do we have tmpfs without size param?
lineno=0
while read line; do
lineno=$(expr $lineno + 1)
has_rel_size=false
case $line in
lxc.mount.entry[[:space:]]*=[[:space:]]*tmpfs[[:space:]]*)
is_tmpfs=true
;;
*)
is_tmpfs=false
;;
esac
# We only care about tmpfs mount entries here
if ! $is_tmpfs; then
continue
fi
case $line in
*size=[0-9][0-9]*%*)
has_rel_size=true
has_size=true
;;
*size=*)
has_size=true
;;
*)
has_size=false
;;
esac
# Add the default size here (50%) if no size is given
if ! $has_size; then
last_option_match="\([[:space:]]*[0-9][[:space:]]*[0-9][::space::]*$\)"
sed "${lineno}s/$last_option_match/,$default_tmpfs\1/" \
"$conf_new" >"${conf_new}.tmp"
mv "${conf_new}.tmp" "${conf_new}"
fi
# Convert relative sizes
if $has_rel_size; then
percent=$(echo "$line" | sed 's/.*size=\([0-9][0-9]*\)%.*/\1/')
size="$((memory*percent/100))"
sed "${lineno}s/size=[0-9]*%/size=${size}/" \
"$conf_new" >"${conf_new}.tmp"
mv "${conf_new}.tmp" "${conf_new}"
fi
done < "$conf_new"
# Do we have any memory limit set?
mem_limit=$(grep 'lxc.cgroup.memory.limit_in_bytes[[:space:]]*=' $conf_new)
if test -z "$mem_limit"; then
echo "lxc.cgroup.memory.limit_in_bytes = $memory" >> "$conf_new"
fi
virsh -c lxc:///system domxml-from-native lxc-tools $conf_new
exit $?