[Bug 1434163] Re: Can't run tests that require build in a readonly testbed

[Leo Arias]

Another possible workaround is to make the device writable, install
fakeroot, and then make it read-only again. This is not ideal of course,
as we want to keep the device read-only. I'm just mentioning it, but
don't try it at home.

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Title:
  Can't run tests that require build in a readonly testbed

Status in autopkgtest package in Ubuntu:
  New

Bug description:
  In the ubuntu-ota-tests project, the debian/control defines a python
  package python3-ubuntu-ota-tests. We need this package to be in the
  PYTHONPATH for it to be found by the upgrade hook.

  If we run 
  $ adt-run --unbuilt-tree . --- ssh -s adb

  We will get:
  dpkg-buildpackage: error: fakeroot not found, either install the fakeroot
  package, specify a command with the -r option, or run this as root
  blame: .
  badpkg: rules build failed with exit code 2
  adt-run [09:57:07]: ERROR: erroneous package: rules build failed with exit code 2
  Exit request sent.

  If we run:
  $ bzr bd --result-dir=/tmp -- -uc -us
  $ adt-run --binary /tmp/python3-ubuntu-ota-tests*.deb --built-tree . --- ssh -s ./adb-reboot-to-recovery

  We will get:
  sh: 1: cannot create /etc/apt/preferences.d/90autopkgtest: Read-only file system
  Exit request sent.
  <VirtSubproc>: failure: copydown destination failed, status 2
  adt-run [09:49:48]: ERROR: testbed failed: cannot send to testbed: ['BrokenPipeError: [Errno 32] Broken pipe\n']

  I think the right solution for this case is the second one, using a
  built-tree, and send the deb to the testbed. So what we are missing is
  to install those debs in the tmp directory just as the rest of
  dependencies.

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