#!/bin/sh -e
#
# rmport - remove port(s) from the FreeBSD Ports Collection.
#
# Copyright 2006 Vasil Dimov
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
#
# Authors:
# Originally written by Vasil Dimov <vd@FreeBSD.org>
# Others:
#
# $FreeBSD$
#
# MAINTAINER=	vd@FreeBSD.org
#

PORTSDIR=${PORTSDIR:-/usr/ports}
INDEX=${PORTSDIR}/`make -C ${PORTSDIR} -V INDEXFILE`

TODAY=`date -u -v+0d +%Y-%m-%d`

SED="sed -i .orig -E"
# use ~/.ssh/config to set up the desired username if different than $LOGNAME
PCVS=${PCVS:-cvs -d pcvs.freebsd.org:/home/pcvs}

log()
{
	echo "==> $*" >&2
}

pkgname()
{
	make -C ${PORTSDIR}/${1} -V PKGNAME
}

# return category/port if arg is directly port's directory on the filesystem
find_catport()
{
	arg=${1}

	if [ -d "${PORTSDIR}/${arg}" ] ; then
		# arg is category/port
		echo ${arg}
	elif [ -d "${arg}" ] ; then
		# arg is the port's directory somewhere in the filesystem
		# either absolute or relative

		# get the full path
		rp=`realpath ${arg}`

		category=`basename \`dirname ${rp}\``
		port=`basename ${rp}`
		echo ${category}/${port}
	else
		echo "What do you mean by \`${arg}'?" >&2
		exit 1
	fi
}

find_expired()
{
	EXPVAR=EXPIRATION_DATE

	find ${PORTSDIR} -mindepth 3 -maxdepth 3 -name "Makefile*" \
		|xargs grep -H ${EXPVAR} \
		|sed -E "s|${PORTSDIR}/?([^/]+/[^/]+)/Makefile:${EXPVAR}=[[:space:]]*([0-9-]{10})$|\2 \1|g" \
		|perl -ne "if ((substr(\$_, 0, 10) cmp '${TODAY}') <= 0) { print(\$_); }"
}

# create temporary checkout directory
mkcodir()
{
	log "creating temporary directory"
	d=`mktemp -d -t rmport`
	log "created ${d}"
	echo "${d}"
}

# checkout common files from the repository
co_common()
{
	log "getting CVSROOT/modules, ports/MOVED and ports/LEGAL from repository"
	${PCVS} co CVSROOT/modules ports/MOVED ports/LEGAL
}

# check if some ports depend on the given port
# XXX Very Little Chance (tm) for breaking INDEX exists:
# /usr/ports/INDEX may be outdated and not contain recently added dependencies
# Anyway, it is very unlikely for someone to make a port to depend on a port
# that has EXPIRATION_DATE set, or /usr/ports/INDEX is really outdated - from
# before EXPIRATION_DATE being set
check_dep()
{
	catport=${1}
	persist=${2}
	alltorm=${3}
	pkgname=`pkgname ${catport}`

	rmpkgs=""
	rmcatports=""
	for torm in ${alltorm} ; do
		rmpkgs="${rmpkgs:+${rmpkgs}|}`pkgname ${torm}`"
		rmcatports="${rmcatports:+${rmcatports}|}${PORTSDIR}/${torm}/"
	done

	while : ; do
		log "${catport}: checking dependencies"

		err=0

		deps=`grep -E "${pkgname}" ${INDEX} |grep -vE "^(${rmpkgs})" || :`
		if [ -n "${deps}" ] ; then
			log "${catport}: some port(s) depend on ${pkgname}:"
			printf "%s\n" "${deps}" >&2
			err=1
		fi

		# check if some port mentions the port to be deleted
		portdir_grep="/`basename ${catport}`"
		r="`find ${PORTSDIR} -mindepth 3 -maxdepth 3 -name "Makefile*" \
			|xargs grep -Hw ${portdir_grep} \
			|grep -vE "^(${rmcatports})" || :`"
		if [ -n "${r}" ] ; then
			log "${catport}: some ports mention ${portdir_grep} in their Makefiles:"
			printf "%s\n" "${r}" >&2
			err=1
		fi

		if [ ${err} -eq 0 ] ; then
			break
		fi

		if [ ${persist} -eq 0 ] ; then
			break
		fi

		read -p 'deal with the above issues and hit <enter> when ready' answer
	done
}

# checkout port's specific files from the repository
co_port()
{
	cat=${1}
	port=${2}

	log "${cat}/${port}: getting ${cat}/Makefile and port's files from repository"
	${PCVS} co ports/${cat}/Makefile ports/${cat}/${port}
}

# check if anything about the port is mentioned in ports/LEGAL
check_LEGAL()
{
	catport=${1}
	pkgname=${2}

	for checkstr in ${pkgname} ${catport} ; do
		msg="${catport}: checking if ${checkstr} is in ports/LEGAL"
		log "${msg}"
		while grep -i ${checkstr} ports/LEGAL ; do
			read -p "${checkstr} is in ports/LEGAL, remove it and hit <enter> when ready" answer
			log "${msg}"
		done
	done
}

# remove port's entry from CVSROOT/modules
edit_modules()
{
	cat=${1}
	port=${2}

	log "${cat}/${port}: removing from CVSROOT/modules"

	${SED} -e "/^(ports_)?(..-)?${port}[[:space:]]+ports\/${cat}\/${port}\$/d" \
		CVSROOT/modules
}

# add port's entry to ports/MOVED
edit_MOVED()
{
	catport=${1}

	DEPRECATED="`make -C ${PORTSDIR}/${catport} -V DEPRECATED`"
	DEPRECATED=${DEPRECATED:+: ${DEPRECATED}}
	REASON="Has expired${DEPRECATED}"

	log "${catport}: adding entry to ports/MOVED"

	echo "${catport}||${TODAY}|${REASON}" >> ports/MOVED
}

# remove port from category/Makefile
edit_Makefile()
{
	cat=${1}
	port=${2}

	log "${cat}/${port}: removing from ${cat}/Makefile"

	${SED} -e "/^[[:space:]]*SUBDIR[[:space:]]*\+=[[:space:]]*${port}([[:space:]]+#.*)?$/d" \
		ports/${cat}/Makefile
}

# remove port's files
rm_port()
{
	catport=${1}

	log "${catport}: removing port's files"

	${PCVS} rm `find ports/${catport} -type f -not -path "*/CVS/*" -delete -print`
}

# diff
diff()
{
	log "creating diff"

	diffout=${codir}/diff

	${PCVS} diff -u CVSROOT/modules ports/MOVED ports/LEGAL \
	ports > ${diffout} 2>&1 || :

	read -p "hit <enter> to view cvs diff output" answer

	# give this to the outside world so it can be removed when we are done
	echo ${diffout}
}

# ask for confirmation and commit
commit()
{
	read -p "do you want to commit? [yn] " answer

	if [ "${answer}" = "y" -o "${answer}" = "Y" ] ; then
		${PCVS} ci CVSROOT/modules ports/MOVED ports/LEGAL \
		ports
	fi
}

cleanup()
{
	diffout=${1}
	codir=${2}

	log "cleaning up"

	rm ${diffout}

	# release cvs directories
	${PCVS} rel -d CVSROOT ports

	cd /
	rmdir ${codir}
}

usage()
{
	echo "Usage:" >&2
	echo "find expired ports:" >&2
	echo "${0} -F" >&2
	echo "remove port(s):" >&2
	echo "${0} category1/port1 [ category2/port2 ... ]" >&2
	echo "just check dependencies:" >&2
	echo "${0} -d category/port" >&2
	exit 64
}

# main

if [ ${#} -eq 0 -o "${1}" = "-h" -o "${1}" = "--help" ] ; then
	usage
fi

if [ ${1} = "-d" ] ; then
	if [ ${#} -ne 2 ] ; then
		usage
	fi
	catport=`find_catport ${2}`
	check_dep ${catport} 0 ${catport}
	exit
fi

if [ ${1} = "-F" ] ; then
	if [ ${#} -ne 1 ] ; then
		usage
	fi
	find_expired
	exit
fi

codir=`mkcodir`
cd ${codir}

co_common

for catport in $* ; do
	# convert to category/port
	catport=`find_catport ${catport}`
	cat=`dirname ${catport}`
	port=`basename ${catport}`
	# remove any trailing slashes
	catport="${cat}/${port}"
	pkgname=`pkgname ${cat}/${port}`

	check_dep ${catport} 1 "${*}"

	co_port ${cat} ${port}

	check_LEGAL ${catport} ${pkgname}

	# everything seems ok, edit the files

	edit_modules ${cat} ${port}

	edit_MOVED ${catport}

	edit_Makefile ${cat} ${port}

	rm_port ${catport}
done

diffout=`diff`

# EDITOR instead of PAGER because vim has nice syntax highlighting ;-)
${EDITOR} ${diffout}

commit

cleanup ${diffout} ${codir}

# EOF