Red Hat Bugzilla – Bug 618139
dvd and cdrom symlinks disappear with readonly root
Last modified: 2010-12-03 08:04:33 EST
Description of problem:
With READONLY_ROOT, the /dev/dvd etc symlinks are created, but disappear the first time a disk is ejected. They are not created when a disk is installed.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1.Boot a readonly root system
2.ls -l /dev/dvd
3.insert a dvd
4.eject the dvd
5. ls -l /dev/dvd
/dev/dvd is missing
/dev/dvd is a symlink to /dev/sr0
This is due to multiple causes. udev-post fails to copy /dev/.udev/tmp* to /etc/udev/rules.d because /etc/udev/rules.d is readonly. This can be fixed by creating a /etc/rwtab.d/udev file contining "files /etc/rwtab.d/udev". This should be part of the udev package.
This still doesn't work because udev, for some reason doesn't reload its rules. This can be fixed by putting "udevadm control --reload-rules" in /etc/rc.local though it should probably be part of /etc/init.d/udev-post.
Also, why does udev-post copy to /etc/udev/rules.d instead of /dev/.udev/rules.d?
The latter is already on a tmpfs and it would save the need to do bind mount trickery. Indeed, why create the /dev/.udev/tmp* files in the first place instead of just writing directly into /dev/.udev/rules.d and save the copy as well?
(In reply to comment #1)
> Also, why does udev-post copy to /etc/udev/rules.d instead of
> The latter is already on a tmpfs and it would save the need to do bind mount
> trickery. Indeed, why create the /dev/.udev/tmp* files in the first place
> instead of just writing directly into /dev/.udev/rules.d and save the copy as
Historical reasons :) /dev/.udev/rules.d came later after the cdrom persistent line generator was written.
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