# ln -sf /usr/share/git-core/contrib/hooks/pre-auto-gc-battery \
# hooks/pre-auto-gc
-if test -x /sbin/on_ac_power && /sbin/on_ac_power
+if test -x /sbin/on_ac_power && (/sbin/on_ac_power;test $? -ne 1)
then
exit 0
elif test "$(cat /sys/class/power_supply/AC/online 2>/dev/null)" = 1