On Mon, Jan 15, 2018 at 02:20:28PM +0000, Dimitri John Ledkov wrote:
> On 15 January 2018 at 00:27, Cyril Brulebois <k...@debian.org> wrote:
> > Hi,
> >
> > Cyril Brulebois <k...@debian.org> (2018-01-12):
> >> Your package is no longer installable (along with its rev-dep
> >> partman-btrfs) because it now depends on libzstd1, which isn't
> >> a udeb.
> >
> > It seems zstd is only an option for btrfs-progs, and I've just confirmed
> > that setting --disable-zstd on the dh_auto_configure line lets btrfs-progs
> > build just fine, without the libzstd1 dependency. As far as I can tell,
> > there's no absolute need for this feature in d-i, and we could consider
> > building the udeb without zstd support, instead of requesting the addition
> > of a libzstd1-udeb. What do you think?
> >
> That's an oversight on my part. From the recovery point of view, it
> would be desired to have zstd compression support built-into
> btrfs-progs-udeb such that one can use d-i recovery mode to
> backup/restore btrfs filesystems with zstd compression.
> -- 
> Regards,
> Dimitri.

Hi Cyril! 

I agree that it's not essential for d-i; although, it's worth
mentioning that zstd seems like it will more likely satisfy users who
are coming from zfs' "lz4 compression is usually beneficial" school of
thought than lzo will.

Dmitri, does btrfs send/receive actually require userspace libzstd?
Or is it needed for defrag? (rewrites files, and also optionally
applies, removes, or changes compression type) I'm guessing that
btrfs-check requires it. (check --repair is, broadly speaking,
equivalent to 'fsck.ext4 -p')

The worst-case d-i bloat for an official arch seems to be 193.4kB for
i386, before compression.  Would you please 'reassign -1 libzstd' if
you agree that Debian's rescue mode should support cloning/restoring
subvolumes with compressed files, and/or being able to repair the
(unmounted) rootfs?  It seems strange that buster's initramfs has this
functionality and that rescue mode doesn't.  Alternatively, the btrfs
binary in the udeb could be statically linked...


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