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start_udev

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Jun 8th, 2019
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  1. #!/bin/sh
  2.  
  3. # - if /dev is not mounted - mount as a devtmpfs (CONFIG_DEVTMPFS=y)
  4. # - if /dev is mounted (e.g. due to handover from initramfs or
  5. #   CONFIG_DEVTMPFS_MOUNT=y), remount with specific options
  6. # - some video drivers require exec access in /dev, thus it's set here
  7. # - for completness, we add few sanity limits (2k non-empty files, 16k inodes)
  8.  
  9. UDEVOPTS="exec,nosuid,noatime,mode=0755,nr_blocks=2048,nr_inodes=16384"
  10. if /bin/mountpoint -q /dev ; then
  11.         /bin/mount -n -o remount,${UDEVOPTS} dev /dev
  12. else
  13.         /bin/mount -n -t devtmpfs -o ${UDEVOPTS} dev /dev
  14. fi
  15.  
  16. # mount /run directory
  17. /bin/mountpoint -q /run  || \
  18. /bin/mount -n -t tmpfs -o mode=0755,nosuid,nodev,exec tmpfs /run
  19.  
  20. # copy devcies from /lib/udev/devices
  21. cp -ar /lib/udev/devices/* /dev
  22.  
  23. # launch udev daemon, make sure it's not running first
  24. test -z "$(/bin/pidof -s udevd)" && /sbin/udevd --daemon
  25.  
  26. # coldplug devices and wait for the queue to be processed
  27. /sbin/udevadm trigger --type=subsystems --action=add
  28. /sbin/udevadm trigger --type=devices --action=add
  29. /sbin/udevadm settle
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