[Debian-med-packaging] Bug#908834: please build libzstd udeb so that btrfs-progs can use zstd in Debian Installer

[Nicholas D Steeves]

Control: retitle -1 please build libzstd udeb so that btrfs-progs can use zstd in Debian Installer
Control: reassign -1 src:libzstd/ 1.3.5+dfsg-1

On Tue, Oct 09, 2018 at 06:24:47PM +0200, Alex Mestiashvili wrote:
> On 10/09/2018 04:32 PM, Dimitri John Ledkov wrote:
> >  is o
> > On Tue, 9 Oct 2018 at 12:23, Alex Mestiashvili <amestia at rsh2.donotuse.de> wrote:
> >>
> >> On 09/14/2018 08:04 PM, Nicholas D Steeves wrote:
...
> >>>
> >>> Would you please build a zstd udeb so that btrfs-progs can use zstd in
> >>> Debian Installer and Rescue System?  It uses zstd for transparent
> >>> filesystem compression.
> >>>
> >>> eg: `chattr +c`, or `btrfs filesystem defrag -c`, or via a mount
> >>> option `compress=zstd`.  I believe the first and last of these use the
> >>> kernel's libzstd, and that the udeb is primarily required for
> >>> `btrfs-repair` to handle zstd extents in the Rescue System.  Also, please continue to CC Dmitri Ledkov, Debian's btrfs-progs maintainer.
> >>>
...
> >>
> >> As far as I see it's enough to add udeb stanzas in d/control in order to
> >> build the udebs[0].
> >> Is there anything else to consider before uploading lisbzstd with udebs?
> >>
> > 
> > No, that's not at all enough. It ends up creating two empty packages,
> > without any files in them.
> 
> Oh, I see. I thought there is some debhelper magic involved and didn't
> check the generated packages..
>

I'm also surprised it didn't run a second dh_install run with $DESTDIR
set to debian/udeb-package.  Or alternatively dh_install debian/udeb-package.

> > 
> > One needs to actually install a library into the library udeb and
> > tools into tools-udeb.
> > Note for fbtrfs only library-udeb is needed.
> 
> Does that also apply for btrfs-repair? Initial bug report is about zstd
> udeb as I see.

Sorry for the inaccuracy; I've retitled and reassigned this bug.
Initially I thought zstd was the name of the source package.

> > 
> > Also do get it reviewed, as last time unwritten rules w.r.t. udebs got
> > enforced and above patch was rejected on ground of not strict enough
> > alternative shlibs deps generated.
> 
> Thank you for clarifying, but I didn't understand the reason of reject :).

Ditto, me neither.  If I had to guess maybe ftpmasters want a manually
generated symbols file for libzstd and libzstd-udeb?

https://wiki.debian.org/UsingSymbolsFiles

> @debian-boot folks, please review and please either fix it or explain
> what is required.
>

Please read what Cyril (Debian Installer Team) wrote at these bugs in
case these questions have already been answered:

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=898410
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=886968

> Are there any udeb related docs available?
> 

Sorry, I don't know of any.

Kind regards,
Nicholas
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