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#!/bin/sh
#
# Script to detect AGL Reference Hardware and switch gpdf configuration
# as needed.
#
# NOTE:
# For the most part errors are ignored and the script returns
# 0/success so gpsd still be started if the script is somehow
# run on a board without the expected hardware.

COMPAT=/sys/firmware/devicetree/base/compatible
GPSTTY=/dev/ttySC3

if [ ! \( -f "$COMPAT" -a -c "$GPSTTY" -a -f /etc/default/gpsd.refhw \) ]; then
    exit 0
fi

found=false
for c in `cat $COMPAT | tr '\0' ' '`; do
    echo "c = $c"
    if echo $c | grep -q '^agl,refhw-h3$'; then
        found=true
        break
    fi
done

if $found; then
    update-alternatives --install /etc/default/gpsd gpsd-defaults /etc/default/gpsd.refhw 20
else
    update-alternatives --remove gpsd-defaults /etc/default/gpsd.refhw
fi
exit 0