86 lines
1.8 KiB
Bash
86 lines
1.8 KiB
Bash
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#!/bin/sh
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# zone-serial-number-hook - Check for missing serial bumps
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#
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# Written in 2020 by Lucas
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#
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# To the extent possible under law, the author(s) have dedicated all
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# copyright and related and neighboring rights to this software to the
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# public domain worldwide. This software is distributed without any
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# warranty.
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#
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# You should have received a copy of the CC0 Public Domain Dedication
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# along with this software. If not, see
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# <http://creativecommons.org/publicdomain/zero/1.0/>.
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# Requires:
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# - POSIX sh
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# - bc
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# - git
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# - ldns-utils
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# Install instructions:
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#
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# cp zone-serial-number-hook "$myrepo/.git/hooks/pre-commit"
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# chmod +x "$myrepo/.git/hooks/pre-commit"
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bc_cmp()
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{
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_X=$1
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_OP=$2
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_Y=$3
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_rc=$(bc <<EOF
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define t(x, y){
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if (x $_OP y) {
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return(0)
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}
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return(1)
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}
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t($_X, $_Y)
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EOF
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)
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return $_rc
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}
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get_serial()
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{
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git show "$1" 2>/dev/null | ldns-read-zone -E SOA | {
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read -r _name _ttl _class _rrtype _rname _mname _serial _rest
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printf "%s\n" "${_serial:-0}"
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}
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}
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if git rev-parse --verify HEAD >/dev/null 2>&1; then
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against=HEAD
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else
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# Initial commit: diff against an empty tree object
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against=$(git hash-object -t tree /dev/null)
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fi
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# Zonefiles names are matched against hooks.zonefile_regex option.
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# Defaults to `\.zone$`.
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zonefile_regex=$(git config --default '\.zone$' hooks.zonefileregex)
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needs_serial_bump=$(git diff-index --name-only --cached "$against" |
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grep -E -- "$zonefile_regex" | {
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rc=0
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while read -r filename; do
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old=$(get_serial "$against:$filename")
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new=$(get_serial ":$filename")
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if bc_cmp "$new" "<=" "$old"; then
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printf "%s\n" "$filename"
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rc=1
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fi
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done
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return $rc
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})
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rc=$?
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if [ $rc -ne 0 ]; then
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# send all output to standard error
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exec >&2
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printf "The following zonefiles require a serial bump:\n"
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printf "- %s\n" $needs_serial_bump
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fi
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exit $rc
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