[Bug 2004500] Re: alternative-bin-sh autopkgtest redirect tar to busybox

[Paride Legovini]

Hi Gioele,

AIUI from [1] the breaks-testbed restriction does not ensure that no
further command gets executed on the testbed system.

The alternative-bin-sh autopkgtest works in Debian because autopkgtest-
virt-lxc (like many other virt servers) has the downtmp-host capability,
which allows autopkgtest to retrieve artifacts using a directory which
is shared with the host system. The lxd and qemu virt servers do not
have this capability, so artifacts are retrieved by building a tarball
on the testbed system (executing commands there) and then retrieving it
(I didn't check exactly how). I don't think we have a bug in
autopkgtest(-virt-lxd) here.

I think the trap you suggested should be added to alternative-bin-sh in
Debian.

For downtmp-host see [2]. Thanks for chiming in!

[1]  https://salsa.debian.org/ci-team/autopkgtest/-/blob/master/doc/README.package-tests.rst
[2] https://salsa.debian.org/ci-team/autopkgtest/-/blob/master/doc/README.virtualisation-server.rst

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https://bugs.launchpad.net/bugs/2004500

Title:
  alternative-bin-sh autopkgtest redirect tar to busybox

Status in lsb-release-minimal package in Ubuntu:
  In Progress

Bug description:
  The alternative-bin-sh autopkgtest is meant to run a set of tests
  using busybox as /bin/sh, however this somehow happens to also
  redirect /bin/tar. This causes autopkgtest failures. To reproduce
  locally fetch the lsb-release-minimal (12.0-1) source tree and run:

  autopkgtest --test-name=alternative-bin-sh -s -U --no-built-binaries
  ./lsb-release-minimal-12.0/ --apt-pocket=proposed=lsb-release-minimal
  -- lxd ubuntu-daily:lunar

  Sample error:

  autopkgtest [19:09:08]: test alternative-bin-sh:  - - - - - - - - - - results - - - - - - - - - -
  alternative-bin-sh   PASS
  tar: unrecognized option '--warning=none'
  BusyBox v1.35.0 (Ubuntu 1:1.35.0-4ubuntu1) multi-call binary.

  Usage: tar c|x|t [-ZzJjahmvokO] [-f TARFILE] [-C DIR] [FILE]...

  Create, extract, or list files from a tar file

  	c	Create
  	x	Extract
  	t	List
  	-f FILE	Name of TARFILE ('-' for stdin/out)
  	-C DIR	Change to DIR before operation
  	-v	Verbose
  	-O	Extract to stdout
  	-m	Don't restore mtime
  	-o	Don't restore user:group
  	-k	Don't replace existing files
  	-Z	(De)compress using compress
  	-z	(De)compress using gzip
  	-J	(De)compress using xz
  	-j	(De)compress using bzip2
  	--lzma	(De)compress using lzma
  	-a	(De)compress based on extension
  	-h	Follow symlinks
  	--overwrite		Replace existing files
  	--strip-components NUM	NUM of leading components to strip
  	--no-recursion		Don't descend in directories
  	--numeric-owner		Use numeric user:group
  	--no-same-permissions	Don't restore access permissions
  	--to-command COMMAND	Pipe files to COMMAND
  tar: This does not look like a tar archive
  tar: Exiting with failure status due to previous errors
  autopkgtest-virt-lxd [19:09:08]: copyup destination failed, status 2

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