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lxc-ubuntu: use btrfs subvolumes and snapshots

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Try to create the cache rootfs as a btrfs subvolume, and use btrfs
snapshots to copy the rootfs if btrfs is selected as backing store.

Signed-off-by: José Martínez <xosemp@gmail.com>
This commit is contained in:
José Martínez 2014-06-17 23:01:33 +02:00
parent f44b73e189
commit 654bf1af09
1 changed files with 46 additions and 7 deletions
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53
templates/lxc-ubuntu.in
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@ -46,6 +46,37 @@ if [ -r /etc/default/lxc ]; then
. /etc/default/lxc
fi
# Check if given path is in a btrfs partition
is_btrfs() {
[ -e $1 -a $(stat -f -c '%T' $1) = "btrfs" ]
}
# Check if given path is the root of a btrfs subvolume
is_btrfs_subvolume() {
[ -d $1 -a $(stat -f -c '%T' $1) = "btrfs" -a $(stat -c '%i' $1) -eq 256 ]
}
try_mksubvolume() {
path=$1
[ -d $path ] && return 0
mkdir -p $(dirname $path)
if is_btrfs $(dirname $path); then
btrfs subvolume create $path
else
mkdir -p $path
fi
}
try_rmsubvolume() {
path=$1
[ -d $path ] || return 0
if is_btrfs_subvolume $path; then
btrfs subvolume delete $path
else
rm -rf $path
fi
}
configure_ubuntu()
{
rootfs=$1
@ -278,8 +309,8 @@ install_packages()
cleanup()
{
rm -rf $cache/partial-$arch
rm -rf $cache/rootfs-$arch
try_rmsubvolume $cache/partial-$arch
try_rmsubvolume $cache/rootfs-$arch
}
suggest_flush()
@ -311,7 +342,7 @@ download_ubuntu()
trap cleanup EXIT SIGHUP SIGINT SIGTERM
# check the mini ubuntu was not already downloaded
mkdir -p "$cache/partial-$arch"
try_mksubvolume "$cache/partial-$arch"
if [ $? -ne 0 ]; then
echo "Failed to create '$cache/partial-$arch' directory"
return 1
@ -370,8 +401,16 @@ copy_ubuntu()
# make a local copy of the miniubuntu
echo "Copying rootfs to $rootfs ..."
mkdir -p $rootfs
rsync -Ha $cache/rootfs-$arch/ $rootfs/ || return 1
try_mksubvolume $rootfs
if is_btrfs_subvolume $cache/rootfs-$arch && is_btrfs_subvolume $rootfs; then
realrootfs=$(dirname $config)/rootfs
umount $rootfs || return 1
btrfs subvolume delete $realrootfs || return 1
btrfs subvolume snapshot $cache/rootfs-$arch $realrootfs || return 1
mount --bind $realrootfs $rootfs || return 1
else
rsync -Ha $cache/rootfs-$arch/ $rootfs/ || return 1
fi
return 0
}
@ -393,8 +432,8 @@ install_ubuntu()
if [ $flushcache -eq 1 ]; then
echo "Flushing cache..."
rm -rf "$cache/partial-$arch"
rm -rf "$cache/rootfs-$arch"
try_rmsubvolume $cache/partial-$arch
try_rmsubvolume $cache/rootfs-$arch
fi
echo "Checking cache download in $cache/rootfs-$arch ... "