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

[Brian Murray]

/run/screen has the following permissions

drwxrwxr-x  3 root  utmp    60 Jul 19 06:06 screen

screen-cleanup is a masked service in response to bug 1462692, so the
permissions of /run/screen are never changed in Ubuntu 16.04.

bdmurray at clean-xenial-amd64:~$ sudo service screen-cleanup status
[sudo] password for bdmurray: 
● screen-cleanup.service
   Loaded: masked (/dev/null; bad)
   Active: inactive (dead)
bdmurray at clean-xenial-amd64:~$ ls -lh /lib/systemd/system/screen-cleanup.service
lrwxrwxrwx 1 root root 9 Oct  4  2016 /lib/systemd/system/screen-cleanup.service -> /dev/null

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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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