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Filename : pg_buildext
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#!/bin/sh
#
# build a PostgreSQL module based on PGXS for given list of supported major
# versions
#
# (C) 2010 Dimitri Fontaine <dfontaine@hi-media.com>
# (C) 2011-2019 Christoph Berg <myon@debian.org>
#
#  This program is free software; you can redistribute it and/or modify
#  it under the terms of the GNU General Public License as published by
#  the Free Software Foundation; either version 2 of the License, or
#  (at your option) any later version.
#
#  This program is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#  GNU General Public License for more details.

set -eu

die() {
    echo "$(basename $0): error: $*" >&2
    exit 1
}

VENVARGS=""
MAKEVARS=""
while getopts "c:i:m:o:s" opt ; do
    case $opt in
	c|i|o) VENVARGS="$VENVARGS -$opt $OPTARG" ;;
	m) MAKEVARS="$OPTARG" ;;
	s) VENVARGS="$VENVARGS -$opt" ;;
	*) exit 1 ;;
    esac
done
# shift away args
shift $(($OPTIND - 1))

[ "${1:-}" ] || die "no action given"
action="$1"
if [ -d "${2:-}" ] && [ "${3:-}" ]; then # optional: $2 is source directory
    srcdir="${2:-}"
    shift
else
    srcdir="$PWD"
fi
target="${2:-}"
opt="${3:-}"

prepare_env() {
    local version=$1
    vtarget=`echo $target | sed -e "s:%v:$version:g"`
    pgc="/usr/lib/postgresql/$version/bin/pg_config"
    [ -e "$pgc" ] || die "$pgc does not exist"
    if [ "${CFLAGS:-}" ]; then
        export COPT="$CFLAGS"
    fi
}

configure() {
    prepare_env $1
    confopts=`echo $opt | sed -e "s:%v:$1:g"`

    mkdir -p $vtarget
    ( echo "calling configure in $vtarget" &&
      cd $vtarget && $srcdir/configure $confopts PG_CONFIG="$pgc" VPATH="$srcdir" )
}

build() {
    prepare_env $1
    if [ "$opt" ]; then
        cflags="$(echo $opt | sed -e "s:%v:$1:g")"
    fi

    mkdir -p $vtarget
    # if a Makefile was created by configure, use it, else the top level Makefile
    [ -f $vtarget/Makefile ] || makefile="-f $srcdir/Makefile"
    make -C $vtarget ${makefile:-} ${cflags:+CFLAGS="$cflags"} PG_CONFIG="$pgc" VPATH="$srcdir" USE_PGXS=1 $MAKEVARS
}

install() {
    prepare_env $1
    package=`echo $opt | sed -e "s:%v:$1:g"`

    mkdir -p $vtarget
    # if a Makefile was created by configure, use it, else the top level Makefile
    [ -f $vtarget/Makefile ] || makefile="-f $srcdir/Makefile"
    make -C $vtarget ${makefile:-} install DESTDIR="$PWD/debian/$package" PG_CONFIG="$pgc" VPATH="$srcdir" USE_PGXS=1 $MAKEVARS
}

clean() {
    prepare_env $1

    # if a Makefile was created by configure, use it, else the top level Makefile
    [ -f $vtarget/Makefile ] || makefile="-f $srcdir/Makefile"
    [ -d $vtarget ] && make -C $vtarget clean ${makefile:-} PG_CONFIG="$pgc" VPATH="$srcdir" USE_PGXS=1 $MAKEVARS
    rm -rf $vtarget
}

loop() {
    echo "### $1 ###"
    prepare_env $1
    package=$(echo $target | sed -e "s:%v:$1:g")

    echo "# $1: make clean"
    make -C "$srcdir" clean   PG_CONFIG="$pgc" USE_PGXS=1 $MAKEVARS
    echo "# $1: make"
    make -C "$srcdir"         PG_CONFIG="$pgc" USE_PGXS=1 $MAKEVARS
    echo "# $1: make install"
    make -C "$srcdir" install DESTDIR="$PWD/debian/$package" PG_CONFIG="$pgc" USE_PGXS=1 $MAKEVARS
    echo "### done $1 ###"
}

installcheck() {
    prepare_env $1

    # ask pg_regress to output unified diffs
    export PG_REGRESS_DIFF_OPTS="-U3"

    # ask pg_virtualenv to create a non-system cluster
    if [ "${NONROOT-unset}" = "unset" ]; then
        export NONROOT=1
    fi

    if [ "$target" ]; then # if target is given, use it, else stay in the top source dir
	# if a Makefile was created by configure, use it, else the top level Makefile
	[ -f $vtarget/Makefile ] || makefile="-f $srcdir/Makefile"
	if ! pg_virtualenv $VENVARGS -v $1 \
	    make -C $vtarget ${makefile:-} installcheck \
		PG_CONFIG="$pgc" VPATH="$srcdir" USE_PGXS=1 $MAKEVARS; then
	    if [ -r $vtarget/regression.diffs ]; then
		echo "**** $vtarget/regression.diffs ****"
		cat $vtarget/regression.diffs
	    fi
	    exit 1
	fi
    else
	if ! pg_virtualenv $VENVARGS -v $1 \
	    make installcheck PG_CONFIG="$pgc" USE_PGXS=1 $MAKEVARS; then
	    if [ -r regression.diffs ]; then
		echo "**** regression.diffs ****"
		cat regression.diffs
	    fi
	    exit 1
	fi
    fi
}

versions() {
    [ -e /usr/share/postgresql-common/supported-versions ] ||
	die "/usr/share/postgresql-common/supported-versions not found"
    [ -e debian/pgversions ] || die "debian/pgversions not found"
    supported_versions=$(/usr/share/postgresql-common/supported-versions)
    local version
    while read version; do
	case $version in
	    all) echo "$supported_versions" ;;
	    [1-9]*+)
		for sup_version in $supported_versions; do
                    if dpkg --compare-versions "${version%+}" le "$sup_version"; then echo "$sup_version"; fi
		done ;;
	    [1-9]*)
		for sup_version in $supported_versions; do
		    if [ "$version" = "$sup_version" ]; then echo "$sup_version"; fi
		done ;;
	    '#'*) ;;
	    '') ;;
	    *) echo "Syntax error in debian/pgversions: $version" >&2 ;;
	esac
    done < debian/pgversions
}

# list of PostgreSQL versions for which packages built from this source are installed
# (not necessarily the same as listed in debian/control)
installed_versions() {
    [ -e debian/control.in ] || die "debian/control.in not found"
    # extract package name template(s) from control.in, split into prefix and suffix
    perl -lne 'print "$1 $2" if /^Package: (.*)PGVERSION(.*)/' debian/control.in | \
        while read prefix suffix; do
            # translate templates to actually installed packages
            dpkg-query --showformat '${db:Status-Status} ${Package}\n' --show "$prefix*$suffix" | \
                grep '^installed' | cut -d ' ' -f 2 | sed -e "s/^$prefix//; s/$suffix\$//"
        done | sort -uV
}

gencontrol() {
    tmpcontrol=$(mktemp debian/control.XXXXXX)
    if [ -f debian/tests/control.in ]; then
        tmptestscontrol=$(mktemp debian/tests/control.XXXXXX)
    fi
    trap "rm -f $tmpcontrol ${tmptestscontrol:-}" 0 2 3 15

    export PGVERSIONS="$(versions)"
    [ "$PGVERSIONS" ] || die "No current PostgreSQL versions are supported by this package"

    perl -e \
        '$/ = ""; # read paragraphs
        while (<>) {
            chomp;
            if (/PGVERSION/) {
                foreach my $version (split /\n/, $ENV{PGVERSIONS}) {
                    push @out, s/PGVERSION/$version/rg;
                }
            } else {
                push @out, $_;
            }
        }
        print join("\n\n", @out), "\n";
        ' debian/control.in > $tmpcontrol

    if [ -f debian/tests/control.in ]; then
        cp debian/tests/control.in $tmptestscontrol
        # find words (package names) containing PGVERSION
        REGEXP='[[:alnum:]-]*PGVERSION[[:alnum:]-]*'
        for pkgpattern in $(egrep -wo "$REGEXP" debian/tests/control.in | sort -u); do
            repl=""
            # build an array of replacements separated by ,
            for v in $(versions); do
                repl="${repl:+$repl, }$(echo $pkgpattern | sed -e "s/PGVERSION/$v/g")"
            done
            # put array into control file
            grep -q "$pkgpattern" $tmptestscontrol # assert the pattern didn't get already removed by an earlier replacement
            sed -i -e "s/$pkgpattern/$repl/" $tmptestscontrol
        done
    fi
}

updatecontrol() {
    cat $tmpcontrol > debian/control

    if [ -f debian/tests/control.in ]; then
        cat $tmptestscontrol > debian/tests/control
    fi
}

# when a version is included in the action, just act on this one (this is
# useful if some extra work needs to be done per version, so the loop over
# supported-versions needs to be in the script calling pg_buildext)

case $action in
    configure-*|build-*|install-*|clean-*|installcheck-*)
	a=${action%%-*}
	v=${action##$a-}
	echo "### $a $v ###"
	$a $v
	exit
	;;

    checkcontrol)
        gencontrol
        need_update=
        if ! diff -u debian/control $tmpcontrol; then
            if [ "${PG_UPDATECONTROL:-no}" != "no" ] || head -1 debian/changelog | egrep -q -- '-backports|-pgdg|-pgapt'; then
                echo "Notice: Updating debian/control from debian/control.in."
                need_update=1
            else
                echo "Error: debian/control needs updating from debian/control.in. Run 'pg_buildext updatecontrol'."
                echo "If you are seeing this message in a buildd log, a sourceful upload is required."
                exit 1
            fi
        fi
        if [ -f debian/tests/control.in ] && ! diff -u debian/tests/control $tmptestscontrol; then
            echo "Notice: Updating debian/tests/control from debian/tests/control.in."
            need_update=1
        fi
        [ "$need_update" ] && updatecontrol
        exit 0
        ;;

    updatecontrol)
        gencontrol
        updatecontrol
        exit
        ;;

    installed-versions)
        installed_versions
        exit
        ;;

    installcheck)
        if [ -f debian/control.in ]; then
            versions=$(installed_versions)
        else
            versions=$(versions)
        fi
        [ "$versions" ] || exit 1
        for v in $versions; do
            echo "### $action $v ###"
            $action $v
        done
        exit
        ;;
esac

# loop over versions

for v in $(versions)
do
    case "$action" in
	"supported-versions")
	    echo $v
	    ;;

	configure|build|install|clean|loop)
	    [ "$target" ] || die "syntax: pg_buildext $action <target> [<srcdir>] [<opt>]"
	    echo "### $action $v ###"
	    $action $v
	    ;;

	*)
	    die "unsupported action '$action'"
	    ;;
    esac
done