I ran into an interesting problem the other day. udev was not creating a
/dev/dvd -> /dev/sr0 symlink.
I finally traced it down to a udev rule that we had in the book since 2014.
# Fail the uevent if the autogenerated rules cannot be saved
ENV{ID_CDROM}=="?*", PROGRAM="/bin/grep -c ' / [^[:space:]]* rw'
/proc/mounts", \
RESULT!="2", RUN+="/bin/false", GOTO="cd_aliases_generator_end"
This was checking for a writable root filesystem. Upon checking, this was
returning a RESULT=1 and incorrectly skipping the following command which
generated the symlinks.
The change was to look for RESULT!="1".
The udev rules we use came from Debian and we have not changed them since
we initially installed them in April 2014.
I have updated the book to reflect this change.
-- Bruce
P.S. Actually now that I am documenting this, I don't think this check is
really needed at all as the writing is done to /dev which is writable when
first mounted in the very first boot script.
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