[Bug 1755858] Re: iscsid autostarts on all servers when it has nothing to do

[ Christian Ehrhardt ]

This now worked a few times locally (4/4) but never on Infra (3/3).

I first thought it would be a timeout for
  qemu-system-x86_64: terminating on signal 15 from pid 25607 (timeout)
  xkvm returned 124 in 3600s
But that is only because it boots into emergency console and hangs there:
  You are in emergency mode. After logging in, type "journalctl -xb" to view

While locally (autopkgtest in VM) it boots&tests fine
  xkvm returned 0 in 200s
  cleaning up tgt mount tgt-boot-test-4mbUyK
  ok
  Ran 3 tests in 230.082s

The other arches are good, because the cloud image based test is only run on amd64.
All other tests run everywhere and are good.

Here a log of one of the many good local runs:
http://paste.ubuntu.com/p/cvMMb9GDTV/

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https://bugs.launchpad.net/bugs/1755858

Title:
  iscsid autostarts on all servers when it has nothing to do

Status in open-iscsi package in Ubuntu:
  Fix Committed
Status in open-iscsi source package in Bionic:
  Triaged
Status in open-iscsi package in Debian:
  New

Bug description:
  In bionic, the open-iscsi systemd unit has the following guards to
  keep it from running on systems with no iscsi targets configured:

  # Must have some pre-defined targets to login to
  ConditionDirectoryNotEmpty=|/etc/iscsi/nodes
  # or have a session to use via iscsid
  ConditionDirectoryNotEmpty=|/sys/class/iscsi_session

  However, iscsid starts from a separate unit and does not include this
  check.  Thus, iscsid starts on every Ubuntu Server install, whether or
  not it has anything to do.

  We should replicate these unit conditionals to the iscsid unit, to
  ensure the daemon doesn't run (consuming memory, and slowing boot)
  when not needed.

  Related bugs:
   * bug 1630946: ubuntu-server depends on open-iscsi and runs iscsid

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