The `-xdev` flag to `find` makes it not recurse over subvolumes; so it only
supports recursion with depth=1. Fix this by having the function
recursively call itself.
This is inspired by the thought that went in to the delete_chroot
is_subvolume commit.
sync_chroot($chrootdir, $copydir) copies `$chrootdir/root` to `$copydir`.
That seems a little silly; why do we care about "$chrootdir"? Have it just
be sync_chroot(source, destination) like every other sync/copy command.
Where this becomes tricky is check to decide if we are going to use btrfs
subvolumes or not. We don't care if "$source/.." is on btrfs; the root
could be a directly-mounted subvolume, but and the destination could be
another subvolume of the same btrfs mounted somewhere else.
The things we do care about are:
- The source is a btrfs subvolume (so that we can snapshot it)
- The source is on the same filesystem as the directory that the copy will
be created in.
- If the destination exists:
* that it is not a mountpoint (so that we can delete and recreate it)
* that it is a btrfs subvolume (so that we can quickly delete it)
On the last point, it isn't necessary for creating the new snapshot, just
for quick deletion. That can be a separate check, where we use regular
`rm` for deleting the existing copy, but use subvolume snapshots for
creating the new one.
First of all, it ran `is_btrfs "$chrootdir"` to decide if it was on
btrfs, but $chrootdir wasn't defined locally; it just happens to work
because $chrootdir was defined in main(). (I noticed this because in
Parabola, it is called differently, so $chrootdir was empty).
So I was tempted to just change it to `is_btrfs "$copydir"`, but if
$copydir is just a regular directory on a btrfs filesystem, then it
It would leave much of $copydir intact. What we really care about is
if $copydir is a btrfs subvolume; which we can check by combining the
is_btrfs check with inspecting the inum of the directory.
I put this combined check in lib/archroot.sh:is_subvolume.
https://lists.archlinux.org/pipermail/arch-projects/2013-September/003901.html
In cases where there is no license specified, the file is tagged as
"License: Unspecified". Obviously, that is not ideal, but it
highlights the fact, and I hope that it encourages whoever has the
authority to specify the license to do so.
On that note, to anyone who may have the authority to specify the
license of files in devtools: the current licence of many files is
GPLv2 with no option for later versions; I impore you to re-license
them to have the "or any later version" option.
The systemd package creates a subvolume at /var/lib/machines (through
tmpfiles), if it can. We need to delete this subvolume before we can
delete the parent subvolume.
Look through the root for inodes with the number 256. These identify
subvolume roots.
Luke Shumaker
Luke Shumaker
Jan Alexander Steffens (heftig)