[Bug 1742744] [NEW] machinectl import-tar hangs when the import file is multi-streamed

[Jesse Pretorius]

Public bug reported:

When trying to use machinectl import-tar to import a compressed rootfs
tarball, if the compression is multi-streamed then the import hangs
after the first stream.

Either the multi-stream import should work, or it should be detected and
an error output.

Environment:
Ubuntu 17.10 (Artful Aardvark)
systemd-container 234-2ubuntu12.1

Steps to reproduce:

# install systemd-container
apt-get update && apt-get install systemd-container

# fetch a multi-stream compressed rootfs
wget http://rpc-repo.rackspace.com/lxc-images/ubuntu/xenial/amd64/default-r14.7.0/20180101/rootfs.tar.xz

# verify that it has multiple streams
xz -lvv rootfs.tar.xz

# try to import it
machinectl --verify=no import-tar rootfs.tar.xz test

** Affects: systemd (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1742744

Title:
  machinectl import-tar hangs when the import file is multi-streamed

Status in systemd package in Ubuntu:
  New

Bug description:
  When trying to use machinectl import-tar to import a compressed rootfs
  tarball, if the compression is multi-streamed then the import hangs
  after the first stream.

  Either the multi-stream import should work, or it should be detected
  and an error output.

  Environment:
  Ubuntu 17.10 (Artful Aardvark)
  systemd-container 234-2ubuntu12.1

  Steps to reproduce:

  # install systemd-container
  apt-get update && apt-get install systemd-container

  # fetch a multi-stream compressed rootfs
  wget http://rpc-repo.rackspace.com/lxc-images/ubuntu/xenial/amd64/default-r14.7.0/20180101/rootfs.tar.xz

  # verify that it has multiple streams
  xz -lvv rootfs.tar.xz

  # try to import it
  machinectl --verify=no import-tar rootfs.tar.xz test

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