ood-ports-lbsd/infrastructure/fetch/link-checksums

#!/bin/sh
# Written by Marc Espie, 2000
# Public domain

# Sets up hard links under a distfiles mirror, so that 
# files will be preserved against checksum changes as a last
# ditch attempt.

# Also see REFETCH in bsd.port.mk, and mirroring-ports (7)

DISTDIR=${DISTDIR:-/usr/ports/distfiles}
cd ${DISTDIR}
CIPHERS=${CIPHERS:-sha1 md5 rmd160 sha256}

bdir=by_cipher
# Build the find so that existing cipher dirs are avoided
exclude="-type d -name $bdir -prune"
for ci in ${CIPHERS}
do
	exclude="${exclude} -o -type d -name $ci -prune"
done
echo "find . \( $exclude \) -o -type f -print"
find . \( $exclude \) -o -type f -print | while read i
do
	file=`basename $i`
	for ci in ${CIPHERS}
	do
		result=`cksum -a $ci -b <$i`
		res=`echo $result|sed -e 's,\(..\).*,\1,'`
		dir=$bdir/$ci/$res/$result
		mkdir -p $dir
		ln -f $i $dir/$file
	done
done