Udev still recommended?

Question

Hello guys,
what's the right way to have access to removable devices such as usb devices since udev seems not to work in the way I was used to as it is written in the wiki down here?
I'm using dwm with simply coreutils in xterm and for some cases vifm as a term-based filemanager. So there's no way to do it with hal and a gui-based filemanager.
So my question, is udev still the right thing to handle this task or are there any other perhaps better solutions?
Best regards.
Last edited by orschiro (2010-01-25 23:14:27)

Answer 1

I guess the warning in the wiki is due to mkinitcpio 0.6 which will remove all the klibc-* stuff. Basically, you have to replace /.../vol_id with /sbin/blkid.
For example, my updated udev file (mount to /media, use label if available, luks support) looks like this now:
KERNEL!="sd[a-z]*", GOTO="media_by_label_auto_mount_end"
ACTION=="add", PROGRAM!="/sbin/blkid %N", GOTO="media_by_label_auto_mount_end"
# Open luks partition if necessary
PROGRAM=="/sbin/blkid -o value -s TYPE %N", RESULT=="crypto_LUKS", ENV{crypto}="mapper/", ENV{device}="/dev/mapper/%k"
ENV{crypto}!="?*", ENV{device}="%N"
ACTION=="add", ENV{crypto}=="?*", PROGRAM=="/usr/bin/xterm -display :0.0 -e 'echo Password for /dev/%k; /usr/sbin/cryptsetup luksOpen %N %k'"
ACTION=="add", ENV{crypto}=="?*", TEST!="/dev/mapper/%k", GOTO="media_by_label_auto_mount_end"
# Global mount options
ACTION=="add", ENV{mount_options}="noatime,users"
# Filesystem specific options
ACTION=="add", PROGRAM=="/sbin/blkid -o value -s TYPE %E{device}", RESULT=="vfat|ntfs", ENV{mount_options}="%E{mount_options},utf8,gid=100,umask=002"
# Get label
ACTION=="add", PROGRAM=="/sbin/blkid -o value -s LABEL %E{device}", ENV{dir_name}="%c"
# use basename to correctly handle labels such as ../mnt/foo
ACTION=="add", PROGRAM=="/usr/bin/basename '%E{dir_name}'", ENV{dir_name}="%c"
ACTION=="add", ENV{dir_name}!="?*", ENV{dir_name}="usbhd-%k"
ACTION=="add", ENV{dir_name}=="?*", RUN+="/bin/mkdir -p '/media/%E{dir_name}'", RUN+="/bin/mount -o %E{mount_options} /dev/%E{crypto}%k '/media/%E{dir_name}'"
ACTION=="remove", ENV{dir_name}=="?*", RUN+="/bin/umount -l '/media/%E{dir_name}'", RUN+="/bin/rmdir '/media/%E{dir_name}'"
ACTION=="remove", ENV{crypto}=="?*", RUN+="/usr/sbin/cryptsetup luksClose %k"
LABEL="media_by_label_auto_mount_end"
However, I'm not sure if I should use blkid's cache or not (-p flag)...
edit:
Changelog
20100303
removed blkid's -p flag as it makes blkid always return the return code 0 even if there is no filesystem on that specifiy device / partition.
20100205
updated rules set. see http://bbs.archlinux.org/viewtopic.php? … 73#p702773
Last edited by xduugu (2010-03-03 10:07:00)