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|
push()
{
$(ARGS_NE mnt src dst_dir)
now=$(date +%F.%H%M%S) || die
snap_dir=$mnt/snapshot.$now
prev_dir=$mnt/snapshot.prev
local BTRFS_RECEIVE_DESTINATION_PATH="$dst_dir"
push_helper true "$snap_dir" "$prev_dir" "$src" local_btrfs_receiver
}
push_simple()
{
$(ARGS_NE mnt src dst_dir)
local BTRFS_RECEIVE_DESTINATION_PATH="$dst_dir"
push_helper false "$mnt" "$src" local_btrfs_receiver
}
sex()
{
(set -x; "$@")
}
local_btrfs_receiver()
{
btrfs receive "$BTRFS_RECEIVE_DESTINATION_PATH"
}
shellescape()
{
if [ "$BASH_VERSION" ]; then
printf %q "$1"
else
bash -c 'printf %q "$1"' bash "$1"
fi
}
remote_btrfs_receiver()
{
ssh "$BTRFS_RECEIVE_DESTINATION_HOST" -- "btrfs receive $(shellescape "$BTRFS_RECEIVE_DESTINATION_PATH")"
}
push_helper()
{
$(ARGS keep_as_prev snap_dir prev_dir src dst_pipe)
$(NONEMPTY keep_as_prev snap_dir src dst_pipe)
local full_dest rw_dest
btrfs subvolume snapshot -r "$src" "$snap_dir" || die
if [ "$prev_dir" -a -d "$prev_dir" ]; then
btrfs send -p "$prev_dir" "$snap_dir"
else
btrfs send "$snap_dir"
fi | "$dst_pipe" || die
if [ "$dst_pipe" = local_btrfs_receiver ]; then
local dst="$BTRFS_RECEIVE_DESTINATION_PATH"
full_dest=$dst/$(basename "$snap_dir")
rw_dest=$full_dest.rw
btrfs subvolume snapshot "$full_dest" "$rw_dest" || die
btrfs_replace_default_subvolume_with "$rw_dest"
fi
if $keep_as_prev && [ "$prev_dir" ]
then
# keep the pushed snapshot in order to reuse it on subsequent pushes.
with_dir "$prev_dir" btrfs subvolume delete || die
sex mv "$snap_dir" "$prev_dir" || die
else
btrfs subvolume delete "$snap_dir"
fi
}
btrfs_mountpoint()
{
$(ARGS_NE dir)
btrfs filesystem show -m "$dir" >/dev/null 2>&1
}
btrfs_get_mountpoint()
{
$(ARGS_NE dir)
while [ "$dir" -a "$dir" != '.' ]; do
if btrfs_mountpoint "$dir"
then printf '%s\n' "$dir"
return
fi
dir=$(dirname "$dir")
done
false
}
btrfs_show_default_path()
{
$(ARGS_NE mp)
local path
mp=$(btrfs_get_mountpoint "$mp") || die # TODO: fix caller?
btrfs_mountpoint "$mp" || die "not a mountpoint: $mp"
path=$(btrfs subvolume get-default "$mp"/|sed -n -e 's/.* path //p')
if [ "$path" ]; then
printf '%s\n' "$mp/$path"
else
printf '%s\n' "$mp"
fi
}
btrfs_show_default_id()
{
$(ARGS_NE mp)
local id
mp=$(btrfs_get_mountpoint "$mp") || die # TODO: fix caller?
btrfs_mountpoint "$mp" || die "not a mountpoint: $mp"
id=$(btrfs subvolume get-default "$mp"/|sed -n -e 's/^ID \([^ ]*\) .*/\1/p')
[ "$id" ] || return
echo $id
}
btrfs_replace_default_subvolume_with()
{
$(ARGS_NE new_default)
local old_default old_default_id new_default_id
old_default_id=$(btrfs_show_default_id "$new_default") || die
new_default_id=$(btrfs_show_subvolume_id "$new_default") || die
[ "$new_default_id" = "$old_default_id" ] && return
if [ "$old_default_id" != 5 ]; then
old_default=$(btrfs_show_default_path "$new_default") || die
else
old_default=
fi
btrfs subvolume set-default "$new_default_id" "$new_default" || die
if [ "$old_default" ]; then
btrfs subvolume delete "$old_default"
sex mv "$new_default" "$old_default"
fi
}
btrfs_show_subvolume_id()
{
$(ARGS_NE path)
local result
result=$(btrfs subvolume show "$path" | sed -n -e 's/^[ \t]*Subvolume ID:[ \t]*//p; s/.*is toplevel subvolume/5/p')
if [ "$result" ]
then printf '%s\n' "$result"
else false
fi
}
with_dir()
{
$(ARGS_NE d)
shift
[ -d "$d" ] || return 0
"$@" "$d"
}
|
