dahdi-linux/build_tools/genudevrules

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#!/bin/sh
ver=`udevinfo -V | cut -f3 -d" "`
if [ -z "${ver}" ]; then
# Not found - try udevadm
ver=`udevadm info -V | cut -f3 -d" "`
if [ -z "${ver}" ]; then
# nobody has that old version, anyway.
ver=54
fi
fi
# udev versions prior to 055 use a single '=' for matching key values
# udev versions 055 and later support '==' for that purpose, and versions
# beyond 092 will probably make it mandatory
#
# very old versions of udev required naming rules and permissions rules to be
# in separate files, but it's not clear at what version number that changed
if [ ${ver} -gt 54 ]; then
match="=="
else
match="="
fi
cat <<EOF
# udev rules to generate the /dev/dahdi device files (if not yet provided
# by your distribution):
KERNEL${match}"dahdictl", NAME="dahdi/ctl"
KERNEL${match}"dahditranscode", NAME="dahdi/transcode"
KERNEL${match}"dahditimer", NAME="dahdi/timer"
KERNEL${match}"dahdichannel", NAME="dahdi/channel"
KERNEL${match}"dahdipseudo", NAME="dahdi/pseudo"
KERNEL${match}"dahdi[0-9]*", NAME="dahdi/%n"
# DAHDI devices with ownership/permissions for running as non-root
SUBSYSTEM${match}"dahdi", OWNER="asterisk", GROUP="asterisk", MODE="0660"
EOF