| #!/bin/sh -e |
| |
| ### BEGIN INIT INFO |
| # Provides: udev-cache |
| # Required-Start: mountall |
| # Required-Stop: |
| # Default-Start: S |
| # Default-Stop: |
| # Short-Description: cache /dev to speedup the udev next boot |
| ### END INIT INFO |
| |
| export TZ=/etc/localtime |
| |
| [ -r /proc/mounts ] || exit 1 |
| [ -x @UDEVD@ ] || exit 1 |
| [ -d /sys/class ] || exit 1 |
| |
| [ -f /etc/default/rcS ] && . /etc/default/rcS |
| DEVCACHE_TMP="/dev/shm/udev-cache-tmp.tar" |
| SYSCONF_CACHED="/etc/udev/cache.data" |
| SYSCONF_TMP="/dev/shm/udev.cache" |
| DEVCACHE_REGEN="/dev/shm/udev-regen" # create to request cache regen |
| |
| # A list of files which are used as a criteria to judge whether the udev cache could be reused. |
| CMP_FILE_LIST="/proc/version /proc/cmdline /proc/devices" |
| [ -f /proc/atags ] && CMP_FILE_LIST="$CMP_FILE_LIST /proc/atags" |
| |
| # List of files whose metadata (size/mtime/name) will be included in cached |
| # system state. |
| META_FILE_LIST="lib/udev/rules.d/* etc/udev/rules.d/*" |
| |
| # Command to compute system configuration. |
| sysconf_cmd () { |
| cat -- $CMP_FILE_LIST |
| stat -c '%s %Y %n' -- $META_FILE_LIST | awk -F/ '{print $1 " " $NF;}' |
| } |
| |
| [ -f /etc/default/udev-cache ] && . /etc/default/udev-cache |
| |
| if [ "$ROOTFS_READ_ONLY" = "yes" ]; then |
| [ "$VERBOSE" != "no" ] && echo "udev-cache: read-only rootfs, skip generating udev-cache" |
| exit 0 |
| fi |
| |
| [ "$DEVCACHE" != "" ] || exit 0 |
| [ "${VERBOSE}" == "no" ] || echo -n "udev-cache: checking for ${DEVCACHE_REGEN}... " |
| if ! [ -e "$DEVCACHE_REGEN" ]; then |
| [ "${VERBOSE}" == "no" ] || echo "not found." |
| exit 0 |
| fi |
| [ "${VERBOSE}" == "no" ] || echo "found." |
| echo "Populating dev cache" |
| |
| err_cleanup () { |
| echo "udev-cache: update failed!" |
| udevadm control --start-exec-queue |
| rm -f -- "$SYSCONF_TMP" "$DEVCACHE_TMP" "$DEVCACHE" "$SYSCONF_CACHED" |
| } |
| |
| ( |
| set -e |
| trap 'err_cleanup' EXIT |
| udevadm control --stop-exec-queue |
| sysconf_cmd > "$SYSCONF_TMP" |
| find /dev -xdev \( -type b -o -type c -o -type l \) | cut -c 2- \ |
| | xargs tar cf "${DEVCACHE_TMP}" |
| gzip < "${DEVCACHE_TMP}" > "$DEVCACHE" |
| rm -f "${DEVCACHE_TMP}" |
| mv "$SYSCONF_TMP" "$SYSCONF_CACHED" |
| udevadm control --start-exec-queue |
| rm -f "$DEVCACHE_REGEN" |
| trap - EXIT |
| ) & |
| |
| exit 0 |