Debian Bug report logs - #709774
Enable aufs on tmpfs via configuration parameter

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Message #5 received at submit@bugs.debian.org (full text, mbox, reply):

From: Joachim Breitner <nomeata@debian.org>

To: Debian Bug Tracking System <submit@bugs.debian.org>

Subject: Enable aufs on tmpfs via configuration parameter

Date: Sat, 25 May 2013 13:02:50 +0200

Package: sbuild
Version: 0.64.0-1
Severity: wishlist

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Hash: SHA1

Hi,

build packages with sbuild in an aufs-like union-type schroot can be
sped up considerably by putting the overlay directory on a tmpfs
partition, as described on
http://juliank.wordpress.com/2010/12/10/sbuild-on-a-tmpfs/
which modifies /etc/fstab

It would be nicer if this feature could be enabled without touching
fstab, by a simple configuration option in schroot.conf. This could
additionally have the advantage that if schroot mounts the overy for
each instance, instead of deleting the overlay afterwards, it can just
unmount the tmpfs to get rid of it.

Greetings,
Joachim


- -- System Information:
Debian Release: jessie/sid
  APT prefers unstable
  APT policy: (500, 'unstable'), (101, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 3.8-2-amd64 (SMP w/4 CPU cores)
Locale: LANG=de_DE.UTF-8, LC_CTYPE=de_DE.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash

Versions of packages sbuild depends on:
ii  adduser         3.113+nmu3
ii  apt-utils       0.9.8.1
ii  libsbuild-perl  0.64.0-1
ii  perl            5.14.2-21
ii  perl-modules    5.14.2-21

Versions of packages sbuild recommends:
ii  debootstrap  1.0.51
ii  fakeroot     1.19-2

Versions of packages sbuild suggests:
pn  deborphan  <none>
ii  wget       1.14-1

- -- no debconf information

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Message #12 received at 709774@bugs.debian.org (full text, mbox, reply):

From: Luca Capello <luca.capello@infomaniak.com>

To: Joachim Breitner <nomeata@debian.org>

Cc: 709774@bugs.debian.org

Subject: Re: Enable aufs on tmpfs via configuration parameter

Date: Wed, 8 Jun 2016 17:36:33 +0200

[Message part 1 (text/plain, inline)]

user luca.capello@infomaniak.com
usertag 709774 + infomaniak.com-packaging
tag 709774 + patch
thanks

Hi there!

On Sat, 25 May 2013 13:02:50 +0200, Joachim Breitner wrote:
> It would be nicer if this feature could be enabled without touching
> fstab, by a simple configuration option in schroot.conf. This could
> additionally have the advantage that if schroot mounts the overy for
> each instance, instead of deleting the overlay afterwards, it can just
> unmount the tmpfs to get rid of it.

To avoid such information to be lost:

  <https://wiki.debian.org/sbuild#sbuild_overlays_in_tmpfs>

=====
root@chobin:~# cat <<EOF >/etc/schroot/setup.d/04tmpfs
#!/bin/sh

set -e

. "\$SETUP_DATA_DIR/common-data"
. "\$SETUP_DATA_DIR/common-functions"
. "\$SETUP_DATA_DIR/common-config"

if [ -n "\${CHROOT_UNION_TYPE}" ] && [ "\${CHROOT_UNION_TYPE}" != 'none' ]; then

    if [ \$STAGE = "setup-start" ]; then
        mount -t tmpfs overlay /var/lib/schroot/union/overlay

    elif [ \$STAGE = "setup-recover" ]; then
        mount -t tmpfs overlay /var/lib/schroot/union/overlay

    elif [ \$STAGE = "setup-stop" ]; then
        umount -f /var/lib/schroot/union/overlay
    fi

fi
EOF
root@chobin:~# chmod a+x /etc/schroot/setup.d/04tmpfs
=====

The above has the disadvantage of mounting a tmpfs on
/var/lib/schroot/union/overlay for each schroot and it is still missing
a configuration option in schroot.conf, but it is already a start ;-)

Thx, bye,
Gismo / Luca

-- 
Luca Capello
Administrateur GNU/Linux

Infomaniak Network SA

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Message #17 received at 709774@bugs.debian.org (full text, mbox, reply):

From: Johannes Schauer <josch@debian.org>

To: 709774@bugs.debian.org

Cc: nomeata@debian.org, luca.capello@infomaniak.com

Subject: reassigning to schroot: Enable aufs on tmpfs via configuration parameter

Date: Thu, 09 Jun 2016 08:18:56 +0200

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Control: reassign -1 schroot

Hi,

On Sat, 25 May 2013 13:02:50 +0200, Joachim Breitner wrote:
> build packages with sbuild in an aufs-like union-type schroot can be
> sped up considerably by putting the overlay directory on a tmpfs
> partition, as described on
> http://juliank.wordpress.com/2010/12/10/sbuild-on-a-tmpfs/
> which modifies /etc/fstab
> 
> It would be nicer if this feature could be enabled without touching
> fstab, by a simple configuration option in schroot.conf. This could
> additionally have the advantage that if schroot mounts the overy for
> each instance, instead of deleting the overlay afterwards, it can just
> unmount the tmpfs to get rid of it.

There is little sbuild can do about this because this is a missing feature of a
sbuild backend (schroot) and not of sbuild itself. Thus, reassigning.

Thanks!

cheers, josch

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