[Bug 1327221] Re: Changing TMPDIR causes ~ inside the container to be owned by root

[Robie Basak]

I should add that moving /tmp is useful on cloud instances, where
there's often a smaller system disk but much more space available on
/mnt.

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https://bugs.launchpad.net/bugs/1327221

Title:
  Changing TMPDIR causes ~ inside the container to be owned by root

Status in “autopkgtest” package in Ubuntu:
  New

Bug description:
  I ran short of space on /tmp, so wanted to use the local directory
  instead. So I did:

  mkdir tmp
  TMPDIR="$PWD/tmp" adt-run ...

  However, this then changed the test environment. ~ became unwriteable
  to my tests. On investigation, it appears that ~ (ie. /home/ubuntu in
  my case) has become owned by root inside the container for some reason
  (I'm using adt-virt-lxc).

  I tried chown root. test && chmod 1777 test, but this didn't work. I
  tried using /mnt/tmp instead (root:root, 1777) and this does appear to
  be a workaround.

  I have reproduced on a fresh Utopic cloud instance (utopic server
  daily image 20140606)  using autopkgtest 2.17.1 as installed from
  Utopic.

  Full steps to reproduce on a fresh Utopic cloud instance:

  sudo apt-get update
  sudo apt-get install autopkgtest lxc
  sudo apt-get install --no-install-recommends ubuntu-dev-tools fakeroot

  pull-lp-source hello trusty
  cd hello-2.8
  sed -i "/^Homepage:/aXS-Testsuite: autopkgtest" debian/control
  mkdir debian/tests
  cat > debian/tests/control <<EOT
  Tests: foo
  Restrictions: allow-stderr
  EOT
  cat > debian/tests/foo <<EOT
  #!/bin/sh
  stat ~
  test -w ~
  EOT
  debuild -us -uc -nc -S
  cd ..

  sudo lxc-create -t ubuntu-cloud -n utopic -- -r utopic -s daily -F

  # Workaround for needing entropy
  sudo rm /dev/random
  sudo ln -s urandom /dev/random

  # Successful case
  # adt-run hello_2.8-4.dsc --- adt-virt-lxc -es utopic

  # Failure case
  mkdir tmp
  TMPDIR="$PWD/tmp" adt-run hello_2.8-*.dsc --- adt-virt-lxc -es utopic

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