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#!/bin/sh
#
# $NetBSD: 02-wedgenames,v 1.8 2021/08/08 10:48:35 martin Exp $
#
# Try to maintain symlinks to wedge devices
#
export LC_ALL=C
event="$1"
shift
wedgedir=/dev/wedges
recurse()
{
test -d "$1" &&
ls -1af "$1" | while read n; do
case $n in
.|..) ;;
*)
echo "$1/$n"
if [ -L "$1/$n" ]; then
: #nothing
elif [ -d "$1/$n" ]; then
recurse "$1/$n"
fi
;;
esac
done
}
simple_readlink()
{
local x
x=$(test -e "$1" && ls -ld "$1")
case $x in
*'-> '*) echo ${x#*-> };;
esac
}
#ordtable=$(
# for n1 in 0 1 2 3 4 5 6 7 8 9 a b c d e f; do
# for n2 in 0 1 2 3 4 5 6 7 8 9 a b c d e f; do
# echo "\$'\x$n1$n2') x=$n1$n2;;"
# done
# done
#)
#
#ord()
#{
# local x
# eval "case \$1 in $ordtable esac"
# echo -n $x
#}
ord()
{
printf %2.2x "'$1"
}
encode()
{
local a b c
a=$1
b=
while [ -n "$a" ]; do
c="${a%"${a#?}"}"
a=${a#?}
case $c in
[][:alnum:]._:\;!^$\&~\(\)[{}=,+/-])
;;
*)
c=%%$(ord "$c")
;;
esac
b=${b}${c}
done
printf %s "$b"
}
remove_wedge() {
recurse "$wedgedir" | while read w; do
t=$(simple_readlink "$w")
if [ x"$t" = x"/dev/$1" ]; then
rm -f "$w"
basedir=${w%/*}
rmdir -p "$basedir" 2>/dev/null
fi
done
}
wedge_label() {
local l
# dkctl getwedgeinfo always outputs 2 "lines", the first
# contains the label (and may contain embedded \n chars)
# the second contains the size, offset, and type, and one
# trailing \n (stripped by the $()) - so we can safely
# extract the label by deleting from the final \n in the
# value getwedgeinfo prints to the end
l=$(dkctl "$1" getwedgeinfo)
l=${l%$'\n'*}
case "${l}" in
$1' at '*': '*)
l=${l#*: }
;;
*)
l=$1
;;
esac
# The trailing <END> is to ensure a trailing \n in the label
# is not deleted by a command substitution which invokes us.
# That will be rmeoved by the caller.
printf %s "${l}<END>"
}
add_wedge() {
local l n
l=$(wedge_label "$1")
l=${l%'<END>'}
case "$l" in */) l="${l}Wedge";; esac
n=$(encode "${l}")
(
umask 022
test -d "$wedgedir" || mkdir -m 755 "$wedgedir"
basedir="$wedgedir/$n"
basedir=${basedir%/*}
test -d "$basedir" || mkdir -p -m 755 "$basedir"
if oldlink=$(simple_readlink "$wedgedir/$n"); then
if [ x"$oldlink" != x"/dev/$1" ]; then
rm -f "$wedgedir/$n"
ln -s "/dev/$1" "$wedgedir/$n"
fi
else
ln -s "/dev/$1" "$wedgedir/$n"
fi
)
}
for device do
case $device in
dk*)
case $event in
device-attach)
remove_wedge "$device"
add_wedge "$device"
;;
device-detach)
remove_wedge "$device"
;;
esac
;;
esac
done
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