[Bug 1761997] Re: /var/run needs mode 777 in bionic

[Axel Beckert]

Hi Brian,

Brian Murray wrote:
> + 2) rm /etc/cron.daily/mlocate (this'll ensure you get a conffile prompt)
> + 3) ssh to Ubuntu 16.04 system so the release upgrade is run in screen
> + 4) run do-release-upgrade -d
> + 5) wait for the conffile prompt from mlocate
> + 6) ssh to the Ubuntu 16.04 system being upgraded
> + 7) sudo -i
> + 8) run screen -rd
> + 
> + With the version of screen in the release pocket you'll receive the
> + following error:
> + 
> + root at clean-xenial-amd64:~# screen -rd
> + Directory '/run/screen' must have mode 777.

Thanks for the detailed explanations.

This sounds a little bit like screen being already unpacked, but not
yet configured. But there must be more than that…

Can you check what permissions /run/screen actually has at that point?

What I don't understand is: Since screen is already running at that
point, /run/screen should already exist with the proper permissions
from either /etc/tmpfiles.d/screen-cleanup.conf or from
/etc/init.d/screen-cleanup from 16.04's screen package. And according
to the changelog (in Debian at least), nothing in the maintainer
scripts changed between 4.3.1-2 and 4.6.2-1. And git log shows only
two commits since June 2015 (where /etc/tmpfiles.d/ support was
finalized), of which one just renames the files and the other one
replaces /var/run/ with /run/ — which both should be defacto noop with
regards to their logic.

Does any other package modify /run/'s permissions recursively during
dist-upgrade?

		Regards, Axel
-- 
 ,''`.  |  Axel Beckert <abe at debian.org>, https://people.debian.org/~abe/
: :' :  |  Debian Developer, ftp.ch.debian.org Admin
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https://bugs.launchpad.net/bugs/1761997

Title:
  /var/run needs mode 777 in bionic

Status in screen package in Ubuntu:
  Triaged
Status in ubuntu-release-upgrader package in Ubuntu:
  New

Bug description:
  [Test Case]
  1) have an Ubuntu 16.04
  2) rm /etc/cron.daily/mlocate (this'll ensure you get a conffile prompt)
  3) ssh to Ubuntu 16.04 system so the release upgrade is run in screen
  4) run do-release-upgrade -d
  5) wait for the conffile prompt from mlocate
  6) ssh to the Ubuntu 16.04 system being upgraded
  7) sudo -i
  8) run screen -rd

  With the version of screen in the release pocket you'll receive the
  following error:

  root at clean-xenial-amd64:~# screen -rd
  Directory '/run/screen' must have mode 777.

  [Original Description]
  I saw some odd behaviour of screen during the upgrade from Xenial to Bionic using do-release-upgrade. I was trying to use screen to reattach to an upgrade process that had gone sideways during a router daemon upgrade (duh). But I was told that the permissions on /run/screen needed to be 777. Does the bionic version of screen have that as a requirement? And if so, perhaps do-release-upgrade should set those permissions in anticipation of the upgrade process so that screen works with both old and new versions.

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