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lxc-debian: add btrfs support

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copied from lxc-ubuntu.in

Signed-off-by: Laurent Vivier <laurent@vivier.eu>
Acked-by: Serge Hallyn <serge@hallyn.com>
This commit is contained in:
Laurent Vivier 2016-06-17 03:19:32 +02:00 committed by Stéphane Graber
parent 6ffa329178
commit 4737d51a62
1 changed files with 50 additions and 5 deletions
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55
templates/lxc-debian.in
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@ -253,10 +253,45 @@ configure_debian_systemd()
return 0
}
# 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 which btrfs >/dev/null 2>&1 && is_btrfs $(dirname $path); then
btrfs subvolume create $path
else
mkdir -p $path
fi
}
try_rmsubvolume()
{
path=$1
[ -d $path ] || return 0
if which btrfs >/dev/null 2>&1 && is_btrfs_subvolume $path; then
btrfs subvolume delete $path
else
rm -rf $path
fi
}
cleanup()
{
rm -rf $cache/partial-$release-$arch
rm -rf $cache/rootfs-$release-$arch
try_rmsubvolume $cache/partial-$release-$arch
try_rmsubvolume $cache/rootfs-$release-$arch
}
download_debian()
@ -303,7 +338,7 @@ openssh-server
| gpg --import --no-default-keyring --keyring=${releasekeyring}
fi
# check the mini debian was not already downloaded
mkdir -p "$cache/partial-$release-$arch"
try_mksubvolume "$cache/partial-$release-$arch"
if [ $? -ne 0 ]; then
echo "Failed to create '$cache/partial-$release-$arch' directory"
return 1
@ -359,8 +394,18 @@ copy_debian()
# make a local copy of the minidebian
echo -n "Copying rootfs to $rootfs..."
mkdir -p $rootfs
rsync -Ha "$cache/rootfs-$release-$arch"/ $rootfs/ || return 1
try_mksubvolume $rootfs
if which btrfs >/dev/null 2>&1 && \
is_btrfs_subvolume "$cache/rootfs-$release-$arch" && \
is_btrfs_subvolume $rootfs; then
realrootfs=$(dirname $config)/rootfs
[ "$rootfs" = "$realrootfs" ] || umount $rootfs || return 1
btrfs subvolume delete $realrootfs || return 1
btrfs subvolume snapshot "$cache/rootfs-$release-$arch" $realrootfs || return 1
[ "$rootfs" = "$realrootfs" ] || mount --bind $realrootfs $rootfs || return 1
else
rsync -Ha "$cache/rootfs-$release-$arch"/ $rootfs/ || return 1
fi
return 0
}