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Bug#964818: marked as done (Enable basic subvolume management for rootfs)

Your message dated Fri, 22 Jan 2021 04:48:43 +0000
with message-id <E1l2oNH-0007zE-Tv@fasolo.debian.org>
and subject line Bug#964818: fixed in partman-btrfs 53
has caused the Debian Bug report #964818,
regarding Enable basic subvolume management for rootfs
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.

(NB: If you are a system administrator and have no idea what this
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-- 
964818: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=964818
Debian Bug Tracking System
Contact owner@bugs.debian.org with problems
--- Begin Message --- 
Package: partman-btrfs
Version: 50
Severity: normal
Control: patch -1
Control: block 840248 by -1

https://salsa.debian.org/installer-team/partman-btrfs/-/merge_requests/1

I have tested the proposed changes and confirmed that they produce the
desired change.

Briefly, the problem: Installing Debian directly to subvolid 5 rather
than to a "rootfs" (like Fedora) or "@" (like SUSE and Ubuntu)
subvolume causes the following problems:

1. It makes it unreasonably difficult to move to a flat subvolume structure
2. It means that any snapshots of the rootfs creates a nested
subvolume rather than flat subvolume structure.
3. It blocks development of "Boot Environments" (consult the web for how these are used in Solaris and FreeBSD and how these would be useful in Debian).
4. It blocks the ability to stage a system upgrade in a @rootfs-sid or @rootfs-stable+1 subvolume and then pivot into this during a reboot; this is an example of how "boot environments" are useful.

There is precedent in Ubuntu for using a non-configurable method (they
additionally add a "@home" subvolume), and the Ubuntu installer does
not offer user configurability of subvolumes during installation.

My plan is thus:

1. After we have installation to subvolumes, add subvolume listing support to the rescue cd.  This has the side-effect of being able to test "boot environments" from the rescue cd.
2. Activate boot environment support via grub-btrfs (#941627).
3. Long-term: add debian-installer support for user-configurable subvolume layout like Fedora and OpenSUSE have.  Ideally I'd like to work on this as part of a btrfs-enablement team

Thanks,
Nicholas

CCing Cyril for Kibi ACK :-)

--- End Message ---
--- Begin Message --- 
Source: partman-btrfs
Source-Version: 53
Done: Cyril Brulebois <kibi@debian.org>

We believe that the bug you reported is fixed in the latest version of
partman-btrfs, which is due to be installed in the Debian FTP archive.

A summary of the changes between this version and the previous one is
attached.

Thank you for reporting the bug, which will now be closed.  If you
have further comments please address them to 964818@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Cyril Brulebois <kibi@debian.org> (supplier of updated partman-btrfs package)

(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing ftpmaster@ftp-master.debian.org)


-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA512

Format: 1.8
Date: Fri, 22 Jan 2021 05:35:51 +0100
Source: partman-btrfs
Architecture: source
Version: 53
Distribution: unstable
Urgency: medium
Maintainer: Debian Install System Team <debian-boot@lists.debian.org>
Changed-By: Cyril Brulebois <kibi@debian.org>
Closes: 964818
Changes:
 partman-btrfs (53) unstable; urgency=medium
 .
   [ Nicholas D Steeves ]
   * Add minimal subvolume support for /.  The btrfs volume designated as the
     device used for "/" is now configured to use the "@rootfs" subvolume.
     This subvolume name was chosen as a compromise between the two primary
     conventions in btrfs default subvolume naming.  Installing the rootfs to
     a subvolume allows update-grub to correctly generate the
     "rootflags=subvol=@rootfs" needed to boot from a subvolume, and other
     subvolumes may be created as needed.  The creation of other commonly used
     subvolumes such as "@home" has not been hard-coded, because a user may
     choose to locate /home on another device--possibly even on another file
     system.  This change unblocks development of btrfs boot environments,
     which most other major operating systems have supported for quite some
     time (Closes: #964818).
   * Migrate to debhelper-compat 13.
   * Assert Rules-Requires-Root: no.
   * Add myself to Uploaders.
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