[Bug 1948713] Re: focal: backport patch to allow mk-sbuild within Docker

[Launchpad Bug Tracker]

This bug was fixed in the package debootstrap - 1.0.123ubuntu6.2

---------------
debootstrap (1.0.123ubuntu6.2) hirsute; urgency=medium

  [ YunQiang Su ]
  * stage1: re-mkdir /proc instead of umount if it is a symlink (LP: #1948713)

 -- Brian Murray <brian at ubuntu.com>  Fri, 19 Nov 2021 10:54:07 -0800

** Changed in: debootstrap (Ubuntu Hirsute)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1948713

Title:
  focal: backport patch to allow mk-sbuild within Docker

Status in debootstrap package in Ubuntu:
  Fix Released
Status in debootstrap source package in Focal:
  Fix Released
Status in debootstrap source package in Hirsute:
  Fix Released
Status in debootstrap package in Debian:
  Fix Released

Bug description:
  Debian bug #968927 is present in the version of debootstrap in focal,
  which means that mk-sbuild cannot execute successfully within a Docker
  environment.

  https://salsa.debian.org/installer-
  team/debootstrap/-/commit/87cdebbcad6f4e16ba711227cbbbd70039f88752 is
  the fix for this.  It's included in the version of debootstrap in
  impish+, and we've been using a patched debootstrap (including only
  this patch on top of focal's debootstrap) for a couple of months
  without issue.

  [Impact]

  Without this patch, using debootstrap via mk-sbuild within a Docker
  environment produces this error:

    ln: failed to create symbolic link '/dev/stdin': File exists
    E: 10mount: E: Failed to open mount file ‘/proc/mounts’: No such file or directory
    E: focal-amd64-6433640d-7654-4238-b872-e8f1acd4b717: Chroot setup failed: stage=setup-stop

  This means that Ubuntu users either have to perform their mk-
  sbuild'ing outside of Docker (which may not be possible in corporate
  settings), or they have to maintain debootstrap downstream of Ubuntu
  (which either requires superseding the versions in Ubuntu entirely, or
  rebasing this patch onto the new version which appears in focal as
  each new release is opened).

  [Test Plan]

  Launch a Docker container (privileged so mk-sbuild can perform overlay
  mounting) with:

    docker run --privileged -it --rm ubuntu:focal

  and then within the container:

    apt-get update
    apt-get install ubuntu-dev-tools sbuild

    # Convince mk-sbuild to run as root
    touch /root/.sbuildrc
    usermod -a -G sbuild root
    newgrp sbuild

    # Run mk-sbuild
    mk-sbuild focal

  After much output, the above-described error will be output.  Using a
  patched debootstrap causes the mk-sbuild to complete successfully.

  Regression testing of regular use of debootstrap (outside of Docker,
  as used in Ubuntu's image building) should be performed: the image
  content should be unchanged.

  [Where problems could occur]

  debootstrap is a fundamental piece of the Debian/Ubuntu image building
  infrastructure, and any change to it could have an impact on how
  Ubuntu images are built.

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