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#!/bin/sh
# author: Mirek Kratochvil
# https://github.com/exaexa/chownmap
help_exit () {
echo "usage: $0 <from> <to> <length> [ files ] ..."
exit $1
}
FROM="$1"
[ -n "$FROM" ] || help_exit 0
[ "$FROM" -ge 0 ] || help_exit 1
TO="$2"
[ -n "$TO" ] || help_exit 0
[ "$TO" -ge 0 ] || help_exit 1
LEN="$3"
[ -n "$LEN" ] || help_exit 0
[ "$LEN" -gt 0 ] || help_exit 1
[ -n "$4" ] || help_exit 0
shift 3
LAST=$(( FROM + LEN ))
CHANGE=$(( TO - FROM ))
CHOWN_EXTRA_OPTS=${CHOWN_EXTRA_OPTS:-}
do_dir () {
find "$1" |while read fn ; do
stat "$fn" -c"%u %g" | {
read uid gid
chuid=$uid
chgid=$gid
[[ $chuid -ge $FROM && $chuid -lt $LAST ]] && chuid=$(( chuid + CHANGE ))
[[ $chgid -ge $FROM && $chgid -lt $LAST ]] && chgid=$(( chgid + CHANGE ))
[[ $uid -ne $chuid || $gid -ne $chgid ]] && chown $CHOWN_EXTRA_OPTS -h $chuid:$chgid "$fn"
}
done
}
while [ -n "$1" ] ; do
do_dir "$1"
shift
done
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