Udev starting in debootstrap environment

[Vladimir Vitkov]

On debootstrapping fresh environment (amd64 in my case) udevd starts up and prevents from unmounting the image/partition mounted on the target.

# lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 14.04 LTS
Release: 14.04
Codename: trusty

# apt-cache policy udev
udev:
  Installed: 204-5ubuntu20.2
  Candidate: 204-5ubuntu20.2
  Version table:
 *** 204-5ubuntu20.2 0
        100 /var/lib/dpkg/status

# apt-cache showsrc udev
Package: systemd
Binary: systemd, systemd-sysv, systemd-services, libpam-systemd, libsystemd-login0, libsystemd-login-dev, libsystemd-daemon0, libsystemd-daemon-dev, libsystemd-journal0, libsystemd-journal-dev, libsystemd-id128-0, libsystemd-id128-dev, udev, libudev1, libudev-dev, udev-udeb, libudev1-udeb, libgudev-1.0-0, gir1.2-gudev-1.0, libgudev-1.0-dev, python-systemd
Version: 204-5ubuntu20.2
Priority: required
Section: admin
Maintainer: Ubuntu Developers <email address hidden>
Original-Maintainer: Debian systemd Maintainers <email address hidden>
Build-Depends: debhelper (>= 9), pkg-config, xsltproc, docbook-xsl, docbook-xml, gtk-doc-tools, m4, dh-autoreconf, automake (>= 1.11), autoconf (>= 2.63), intltool, gperf, libcap-dev, libcgmanager-dev, libpam0g-dev, libaudit-dev, libdbus-1-dev (>= 1.3.2), libglib2.0-dev (>= 2.22.0), libcryptsetup-dev (>= 2:1.4.2), libwrap0-dev, libselinux1-dev (>= 2.1.9), libacl1-dev, libattr1-dev, liblzma-dev, libgcrypt11-dev, libkmod-dev (>= 5), libblkid-dev (>= 2.20), libgirepository1.0-dev (>= 1.31.1), gobject-introspection (>= 1.31.1), python-dev, libglib2.0-doc
Architecture: linux-any
Standards-Version: 3.9.4
Format: 3.0 (quilt)
Directory: pool/main/s/systemd
Files:
 4b46ec0025e6930b766afcdb3900da1a 3772 systemd_204-5ubuntu20.2.dsc
 a07619bb19f48164fbf0761d12fd39a8 2186264 systemd_204.orig.tar.xz
 24aba71a24ab88be4ef4f7ab0c650fef 160212 systemd_204-5ubuntu20.2.debian.tar.gz
Uploaders: Tollef Fog Heen <email address hidden>, Michael Biebl <email address hidden>, Marco d'Itri <email address hidden>
Homepage: http://www.freedesktop.org/wiki/Software/systemd
Vcs-Browser: http://anonscm.debian.org/gitweb/?p=pkg-systemd/systemd.git;a=summary
Vcs-Git: git://anonscm.debian.org/pkg-systemd/systemd.git -b debian
Package-List:
 gir1.2-gudev-1.0 deb introspection optional
 libgudev-1.0-0 deb libs optional
 libgudev-1.0-dev deb libdevel optional
 libpam-systemd deb admin optional
 libsystemd-daemon-dev deb libdevel optional
 libsystemd-daemon0 deb libs optional
 libsystemd-id128-0 deb libs optional
 libsystemd-id128-dev deb libdevel optional
 libsystemd-journal-dev deb libdevel optional
 libsystemd-journal0 deb libs optional
 libsystemd-login-dev deb libdevel optional
 libsystemd-login0 deb libs optional
 libudev-dev deb libdevel optional
 libudev1 deb libs important
 libudev1-udeb udeb debian-installer optional
 python-systemd deb python optional
 systemd deb admin optional
 systemd-services deb admin optional
 systemd-sysv deb admin extra
 udev deb admin important
 udev-udeb udeb debian-installer optional
Checksums-Sha1:
 eba3d58db0f1c8a56a01607ed79538db2606fe2a 3772 systemd_204-5ubuntu20.2.dsc
 37b45766a44a95a6b6a7cdf4b587c151375b2053 2186264 systemd_204.orig.tar.xz
 f910e2e867a311353578c1264fb1001eafc18c5d 160212 systemd_204-5ubuntu20.2.debian.tar.gz
Checksums-Sha256:
 286d24c638c9cc784e40b716660754360f55f3ced8afd02fe1da6a869f4f7aa2 3772 systemd_204-5ubuntu20.2.dsc
 072c393503c7c1e55ca7acf3db659cbd28c7fe5fa94fab3db95360bafd96731b 2186264 systemd_204.orig.tar.xz
 38cbbdbe31bfc147d25f172b6deb279181e0b5cbb404312d2d9e6c38d49b4ebb 160212 systemd_204-5ubuntu20.2.debian.tar.gz
Testsuite: autopkgtest

# Steps to reproduce:
 * create an image/partition of sufficient size (1G will suffice for a simple test) and format with some FS
 * debootstrap like: debootstrap --arch=amd64 --variant=minbase --include=language-pack-en,wget,curl,language-pack-en-base trusty /target/0481fbd0/root http://bg.archive.ubuntu.com/ubuntu
 * wait for the debootstrap to finish
 * try to unmount --> fail

# Expected outcome:
 * be able to cleanly unmount the image/partition
 * udev not restarted inside the debootstrap env

The problem lies in the postinst script which does

  invoke-rc.d udev restart.

During debootstrapping we have no ability to configure the init scripts policy layer to prevent execution. Therefore the udev postinst should check if it is in a debootstrap environment and if so not start/restart. Other actions like updating HWDB and seting startup scripts are fine and acceptable.

This bug is analogous to Debian #520742, and Ubuntu #1260707.

The solution in debian is to check for debootstrap env and not start/restart.

The issue in Ubuntu seems to have been introduced in 202-0ubuntu6 ( - Add debian/udev.postinst for restarting udev and rebuilding initramfs.)

[Martin Pitt (pitti)]

Fixed in git, thanks for pointing out!

[Martin Pitt (pitti)]

FTR, I can't reproduce the umount failure, but I verified that udev now doesn't (re)start in a chroot and in debootstrap.

[Launchpad Janitor (janitor)]

This bug was fixed in the package systemd - 204-12ubuntu1

---------------
systemd (204-12ubuntu1) utopic; urgency=medium

  * Merge with Debian unstable. See 204-10ubuntu1 for remaining Ubuntu
    changes.
  * udev.postinst: Don't restart udev in a chroot or during debootstrap.
    (LP: #1329684)

systemd (204-12) unstable; urgency=medium

  [ Martin Pitt ]
  * Change the sg loading rule (for Debian #657948) back to using modprobe.
    kmod is too fast and then sg races with sd, causing the latter to not see
    SCSI disks. (Closes: #752591, #752605)

  [ Michael Biebl ]
  * Update udev bug-script to attach instead of paste extra info if a new
    enough reportbug version is available.

systemd (204-11) unstable; urgency=medium

  [ Martin Pitt ]
  * Explain patch management in debian/README.source. (Closes: #739113)
  * Replace "Always probe cpu support drivers" patch with cherry-picked
    upstream fix which is more general.
  * Advertise hibernation only if there's enough free swap. Patches backported
    from current upstream. (LP: #1313522)
  * Fix typo in sg loading rule to make it actually work.

  [ Michael Biebl ]
  * Make no-patch-numbers the default for gbp-pq.
  * Cherry-pick upstream fix to properly handle multiline syslog messages.
    (Closes: #746351)
  * Cherry-pick upstream fix for libudev which fixes a memleak in
    parent_add_child().
  * Drop "-b debian" from Vcs-Git since we use the master branch for
    packaging now.
  * Drop Conflicts: sysvinit (<< 2.88dsf-44~) from systemd-sysv since this
    breaks dist-upgrades from wheezy when switching from sysvinit to
    systemd-sysv as default init. While downgrading the Pre-Depends in
    sysvinit would have been an alternative, dropping the Conflicts and only
    keeping the Replaces was deemed the lesser evil. (Closes: #748355)
  * Use Conflicts instead of Breaks against sysvinit-core. This avoids
    /sbin/init going missing when switching from systemd-sysv to sysvinit.
    While at it, add a Replaces: upstart. (Closes: #751589)
  * Make the SysV compat tools try both /run/initctl and /dev/initctl. This
    makes them usable under sysvinit as PID 1 without requiring any symlinks.
  * Various ifupdown integration fixes
    - Use DefaultDependencies=no in ifup@.service so the service can be
      started as early as possible.
    - Create the ifupdown runtime directory in ifup@.service as we can no
      longer rely on the networking service to do that for us.
    - Don't stop ifup@.service on shutdown but let the networking service take
      care of stopping all hotplugged interfaces.
    - Only start ifup@.service for interfaces configured as allow-hotplug.

  [ Michael Stapelberg ]
  * Clarify that “systemd” does not influence init whereas “systemd-sysv” does
    (Closes: #747741)

  [ Ansgar Burchardt ]
  * Don't use "set +e; set +u" unconditionally in the lsb init-functions hook
    as this might change the behaviour of existing SysV init scripts.
    (Closes: #751472)
 -- Martin Pitt <email address hidden> Thu, 26 Jun 2014 11:21:23 +0200