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#!/bin/ksh
#
# $OpenBSD: diff.sh,v 1.6 2019/05/12 14:57:30 robert Exp $
#
# Copyright (c) 2017, 2019 Robert Nagy <robert@openbsd.org>
#
# Permission to use, copy, modify, and distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
umask 0022
trap exit HUP INT TERM
[[ "$1" != /* ]] || [[ "$2" != /* ]] &&
echo "paths have to be absolute" &&
exit 1
plist=$(mktemp)
trap 'rm -f ${plist}' EXIT
padd() {
local _path=$1
readlink -f ${_path} >> ${plist}
}
diff -Parq $1 $2 2>&1 | grep ' differ$' |
while IFS= read -r _d
do
_o=$(echo $_d | cut -d ' ' -f2)
_n=$(echo $_d | cut -d ' ' -f4)
case "${_o##*.}"
in
a)
cmp -s ${_o} ${_n} 34 34 || padd ${_n}
;;
1|3p)
# Needed for perl(1) because Pod::Man adds the build
# date in the man page; e.g. /usr/share/man1/pod2html.1:
# .TH POD2HTML 1 "2017-07-29" "perl v5.24.1"
_onm=$(mktemp)
_nnm=$(mktemp)
trap 'rm -f ${_onm} ${_nnm}' EXIT
sed -E '/([0-9]+-[0-9]+-[0-9]+|=+)/d' ${_o} > ${_onm}
sed -E '/([0-9]+-[0-9]+-[0-9]+|=+)/d' ${_n} > ${_nnm}
diff -q ${_onm} ${_nnm} >/dev/null || padd ${_n}
rm -f ${_onm} ${_nnm}
;;
EFI|dat|db|tgz|*void|*dir|mk|cache-4)
;;
*)
padd ${_n}
;;
esac
done
sort -u ${plist}
|
