[Bug 1892367] Re: [UBUNTU 20.04] udev rule change did not get applied

[Dimitri John Ledkov]

Sounds good! Looking forward to that patch. And then we will most likely
try to pick it up for stable release updates too. Cause yes, this
behaviour needs to be fixed properly.

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Title:
  [UBUNTU 20.04] udev rule change did not get applied

Status in subiquity:
  Invalid
Status in Ubuntu on IBM z Systems:
  New
Status in s390-tools package in Ubuntu:
  New

Bug description:
  During the ubuntu installation in tessia, we do chzdev for both dasd
  and qeth devices, as below.

  2020-08-20 09:54:45 | INFO | START subiquity/Early/run/command_1 : chzdev -e dasd 385c
  2020-08-20 09:54:45 | INFO | SUCCESS subiquity/Early/run/command_1 : chzdev -e dasd 385c
  2020-08-20 09:54:45 | INFO | START subiquity/Early/run/command_2 : chzdev -e qeth 0.0.bdf0
  2020-08-20 09:54:47 | INFO | SUCCESS subiquity/Early/run/command_2 : chzdev -e qeth 0.0.bdf0

  and we can see the below files in the /etc/udev/rules.d/
  oot at m8360024:~# ls -l /etc/udev/rules.d/
  total 76
  -rw-r--r-- 1 root root   154 Aug 20 09:08 41-cio-ignore.rules
  -rw-r--r-- 1 root root   430 Aug 20 09:08 41-dasd-eckd-0.0.385c.rules
  -rw-r--r-- 1 root root   357 Aug 20 09:08 41-generic-ccw-0.0.0009.rules
  -rw-r--r-- 1 root root  1049 Aug 20 09:08 41-qeth-0.0.bdf0.rules
  -rw-r--r-- 1 root root 58549 Aug 20 09:10 70-snap.snapd.rules

  Now, lsinitramfs shows files as below,

  root at m8360024:~# lsinitramfs /boot/initrd.img-5.4.0-42-generic | grep 41
  etc/udev/rules.d/41-cio-ignore-root.rules
  etc/udev/rules.d/41-dasd-eckd-0.0.385c.rules
  usr/lib/udev/rules.d/41-cio-ignore.rules
  usr/lib/udev/rules.d/41-dasd-eckd-0.0.385c.rules
  usr/lib/udev/rules.d/41-generic-ccw-0.0.0009.rules
  usr/lib/udev/rules.d/41-qeth-0.0.bdf0.rules

  Even though lsinitramfs shows the below files, they are overruled by
  the filesystem files.

  Next thing we did was to modify the 41-qeth-0.0.bdf0.rules and
  modified the buffer_count to 128 (As in the attached file). In ideal
  scenario, the value should we modified as mentioned in the bug. But,
  in our case, if we are not doing a zipl or update-initramfs -u, the
  value is not getting modified.

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