# vim:ft=sh:
# This file contains common functionality for all postgresql server
# package maintainer scripts.
# Most functions accept the version number as first argument and as second
# optional argument a spelling variant of the version number used in package
# names that can be used for flavored package builds.

# arguments: version master package [package package]
_link_manpages() {
    VERSION="$1"
    NAME="$2"
    MANS=$(unset GREP_OPTIONS; dpkg -L $3 $4 $5 2>/dev/null | grep -E "postgresql/$VERSION/man/.*\\.[1-9](\\.gz)?\$" | grep -v "$NAME") || true
    [ -n "$MANS" ] || return 0

    SLAVES=$(for man in $MANS; do TARGET=$(echo $man | sed -e "s/postgresql\/$VERSION\/man/man/"); echo -n " --slave $TARGET ${man##*/} $man"; done)

    # user might have removed the directories, allow u-a to succeed
    mkdir -p /usr/share/man/man1 /usr/share/man/man3 /usr/share/man/man7
    section=$(echo "$NAME" | sed -e 's/.*\.\(.*\)\..*/man\1/')
    case $VERSION in
        [89]*) priority=$(echo "$VERSION" | tr -cd 0-9) ;;
        *) priority="${VERSION}0" ;;
    esac
    update-alternatives --install /usr/share/man/$section/$NAME \
	$NAME /usr/share/postgresql/$VERSION/man/$section/$NAME \
	$priority $SLAVES
}

# Merge postmaster.1.gz (removed in PG16) alternatives with psql.1.gz (248)
relink_postmaster_manpages ()
{
    update-alternatives --list postmaster.1.gz >/dev/null 2>&1 || return 0

    echo "Merging postmaster.1.gz alternatives into psql.1.gz link group ..."
    update-alternatives --remove-all postmaster.1.gz
    for dir in /usr/lib/postgresql/*; do
        if test -x $dir/bin/psql; then
            v=${dir#/usr/lib/postgresql/}
            _link_manpages $v psql.1.gz percona-postgresql-client-$v percona-postgresql-$v percona-postgresql-contrib-$v
        fi
    done
}

# arguments: version master
_unlink_manpages() {
    VERSION="$1"
    NAME="$2"
    # user might have removed the directories, allow u-a to succeed
    mkdir -p /usr/share/man/man1 /usr/share/man/man3 /usr/share/man/man7
    section=$(echo "$NAME" | sed -e 's/.*\.\(.*\)\..*/man\1/')
    update-alternatives --remove $NAME /usr/share/postgresql/$VERSION/man/$section/$NAME
    rmdir --ignore-fail-on-non-empty -p /usr/share/man/man1 /usr/share/man/man3 /usr/share/man/man7
}

_remove_tsearch() {
    VERSION="$1"
   if [ -e /usr/share/postgresql/$VERSION/tsearch_data ]; then
       find /usr/share/postgresql/$VERSION/tsearch_data -type l \( -name '*.dict' -o -name '*.affix' \) -exec rm '{}' \;
   fi
}

# Determine and set system's default locale; we do not want to trust the
# environment here, as ssh and sudo both propagate the user's locale from
# potentially a remote host, and that might not even exist; also, we want to be
# predictable.  /etc/default/locale overrides /etc/environment. Note that
# /etc/environment is not a shell script, so we must be careful with parsing.
set_system_locale() {
    loc_vars="LANG LANGUAGE LC_CTYPE LC_NUMERIC LC_TIME LC_COLLATE LC_MONETARY LC_MESSAGES LC_PAPER LC_NAME LC_ADDRESS LC_TELEPHONE LC_MEASUREMENT LC_IDENTIFICATION LC_ALL"
    unset $loc_vars
    LANG="C.UTF-8" # fallback locale if nothing is configured explicitly
    for v in $loc_vars; do
        unset val
        val=`pam_getenv -l $v` || true
        [ -z "$val" ] || export $v="$val"
    done
    [ -e /etc/default/locale ] && . /etc/default/locale || true
    export $loc_vars
}

# arguments: <major version> <most recently configured package version>
create_main_cluster() {
    VERSION="$1"

    # Skip if this package was configured before
    [ "$2" ] && return 0

    # Skip if any other cluster already exists
    [ "$(ls /etc/postgresql/*/*/postgresql.conf 2>/dev/null)" ] && return 0

    # Skip if this isn't the newest major installed (assumes other packages are
    # unpacked first before this one is configured)
    [ "$(ls -v /usr/lib/postgresql/*/bin/postgres | tail -n1)" = "/usr/lib/postgresql/$VERSION/bin/postgres" ] || return 0

    # Skip when disabled explicitly
    create=$(pg_conftool /etc/postgresql-common/createcluster.conf show -bs create_main_cluster || :)
    [ "$create" = "off" ] && return 0

    set_system_locale
    pg_createcluster -u postgres --no-status $VERSION main ||
        echo "Error: could not create default cluster. Please create it manually with

  pg_createcluster $VERSION main --start

or a similar command (see 'man pg_createcluster')." >&2
}

# arguments: <major version> <most recently configured package version>
configure_version() {
    VERSION="$1"
    PKG_VER="${3:-$1}"
    [ "$VERSION" ] || { echo "Error: configure_version: need version parameter" >&2; exit 1; }

    relink_postmaster_manpages
    _link_manpages "$VERSION" psql.1.gz "percona-postgresql-client-$PKG_VER" "percona-postgresql-$PKG_VER" "percona-postgresql-contrib-$PKG_VER"

    # check if our catalog version changed
    postinst_check_catversion "$VERSION"

    # done with debconf
    db_stop || true

    # create cluster
    create_main_cluster "$VERSION" "$2"

    # update list of packages not to apt-autoremove
    /usr/share/postgresql-common/pg_updateaptconfig

    # reload systemd to let the generator pick up the new unit
    if [ -d /run/systemd/system ]; then
        systemctl daemon-reload
    fi
    invoke-rc.d postgresql start $VERSION # systemd: argument ignored, starts all versions
}

stop_version() {
    VERSION="$1"
    if [ -d /run/systemd/system ]; then
        # cannot use invoke-rc.d here because jessie's version doesn't like patterns
        deb-systemd-invoke stop "postgresql@$VERSION-*"
    else
        invoke-rc.d postgresql stop $VERSION
    fi
}

remove_version() {
    VERSION="$1"
    PKG_VER="${2:-$1}"
    # we still want to retain the alternatives for the client packages
    _link_manpages "$VERSION" psql.1.gz "percona-postgresql-client-$PKG_VER"
    _remove_tsearch "$VERSION"
    # update list of packages not to apt-autoremove
    /usr/share/postgresql-common/pg_updateaptconfig
}

configure_client_version() {
    VERSION="$1"
    PKG_VER="${3:-$1}"
    relink_postmaster_manpages
    _link_manpages "$VERSION" psql.1.gz "percona-postgresql-client-$PKG_VER" "percona-postgresql-$PKG_VER" "percona-postgresql-contrib-$PKG_VER"
}

remove_client_version() {
    VERSION="$1"
    _unlink_manpages "$VERSION" psql.1.gz
}

configure_contrib_version() {
    VERSION="$1"
    PKG_VER="${3:-$1}"
    relink_postmaster_manpages
    _link_manpages "$VERSION" psql.1.gz "percona-postgresql-client-$PKG_VER" "percona-postgresql-$PKG_VER" "percona-postgresql-contrib-$PKG_VER"
}

remove_contrib_version() {
    VERSION="$1"
    PKG_VER="${2:-$1}"
    # we still want to retain the alternatives for the server packages
    _link_manpages "$VERSION" psql.1.gz "percona-postgresql-client-$1" "percona-postgresql-$PKG_VER"
}

configure_doc_version() {
    VERSION="$1"
    PKG_VER="${3:-$1}"
    _link_manpages "$VERSION" SPI_connect.3.gz "percona-postgresql-doc-$PKG_VER"
}

remove_doc_version() {
    VERSION="$1"
    _unlink_manpages "$VERSION" SPI_connect.3.gz
}

# Compare the catalog version number of the installed package and the new
# package. When differing, check if any clusters present are using the old
# catalog version. If so, copy a minimal set of files from the old package to
# /var/tmp to enable pg_upgrade to upgrade to the new version.

preinst_check_catversion()
{
    MAJOR_VER="$1"
    NEW_CATVERSION="$2"
    case $NEW_CATVERSION in
        *CATVERSION*) echo "BUG: override_dh_installdeb failed to set CATVERSION" >&2
        return ;;
    esac

    CATFILE="/usr/share/postgresql/$MAJOR_VER/catalog_version"
    [ -f "$CATFILE" ] || return 0 # file introduced in 9.6
    OLD_CATVERSION="$(cat $CATFILE)"
    [ -z "$OLD_CATVERSION" ] && return

    [ "$OLD_CATVERSION" = "$NEW_CATVERSION" ] && return # no change, nothing to do

    PGCONTROLDATA="/usr/lib/postgresql/$MAJOR_VER/bin/pg_controldata"
    [ -x "$PGCONTROLDATA" ] || return 0

    echo "PostgreSQL $MAJOR_VER catalog version number changed from $OLD_CATVERSION to $NEW_CATVERSION, checking for clusters using the old version ..."

    pg_lsclusters -h | \
    while read version cluster port status owner pgdata logfile; do
        [ "$version" = "$MAJOR_VER" ] || continue
        [ -d "$pgdata" ] || continue
        DB_CATVERSION=$(LC_ALL=C $PGCONTROLDATA $pgdata 2>/dev/null | sed -ne 's/^Catalog version number: *\([0-9]\+\)/\1/p')

        if [ "$DB_CATVERSION" = "$OLD_CATVERSION" ]; then
            echo "Cluster $MAJOR_VER/$cluster is using catalog version $DB_CATVERSION"

            VARTMPDIR="/var/tmp/postgresql-$MAJOR_VER-$OLD_CATVERSION"
            if [ ! -d "$VARTMPDIR" ]; then
                echo "Saving binaries for PostgreSQL $MAJOR_VER catalog version $OLD_CATVERSION in $VARTMPDIR ..."
                mkdir "$VARTMPDIR" # will fail&exit if (potentially rogue) file exists
                cp -a /usr/lib/postgresql/$MAJOR_VER/bin /usr/lib/postgresql/$MAJOR_VER/lib "$VARTMPDIR"
                chown -R postgres: "$VARTMPDIR" # make catversion bump instructions not require root
            fi
        fi
    done
}

postinst_check_catversion()
{
    MAJOR_VER="$1"

    CATFILE="/usr/share/postgresql/$MAJOR_VER/catalog_version"
    [ -f "$CATFILE" ] || return 0 # file introduced in 9.6
    NEW_CATVERSION="$(cat $CATFILE)"
    [ -z "$NEW_CATVERSION" ] && return

    PGCONTROLDATA="/usr/lib/postgresql/$MAJOR_VER/bin/pg_controldata"
    [ -x "$PGCONTROLDATA" ] || return 0

    for cluster in $(pg_lsclusters -h | awk "/^$MAJOR_VER / { print \$2 }"); do
        pgdata=$(pg_conftool -s $MAJOR_VER $cluster show data_directory) || continue
        [ -d "$pgdata" ] || continue

        DB_CATVERSION=$(LC_ALL=C $PGCONTROLDATA $pgdata | sed -ne 's/^Catalog version number: *\([0-9]\+\)/\1/p')
        [ -z "$DB_CATVERSION" ] && continue
        [ "$DB_CATVERSION" = "$NEW_CATVERSION" ] && continue

        VARTMPDIR="/var/tmp/postgresql-$MAJOR_VER-$DB_CATVERSION"
        [ -d "$VARTMPDIR" ] || continue
        [ -O "$VARTMPDIR" ] || continue # test if owned by root

        # tell the user about it
	cat <<-EOF
	Cluster $MAJOR_VER $cluster needs upgrading due to catalog version change:
	  pg_renamecluster ${MAJOR_VER} ${cluster} ${cluster}.old
	  pg_upgradecluster ${MAJOR_VER} ${cluster}.old --rename ${cluster} -m upgrade -v ${MAJOR_VER} --old-bindir=${VARTMPDIR}/bin
	  pg_dropcluster ${MAJOR_VER} ${cluster}.old
	  rm -rf ${VARTMPDIR}
	EOF
        db_fset percona-postgresql-common/catversion-bump seen false
        db_subst percona-postgresql-common/catversion-bump version $MAJOR_VER
        db_subst percona-postgresql-common/catversion-bump cluster $cluster
        db_subst percona-postgresql-common/catversion-bump db_catversion $DB_CATVERSION
        db_subst percona-postgresql-common/catversion-bump new_catversion $NEW_CATVERSION
        db_subst percona-postgresql-common/catversion-bump vartmpdir $VARTMPDIR
        db_input high percona-postgresql-common/catversion-bump || true
        db_go || true
    done
}

# start debconf if we are in the server's postinst (can't run from a function)
if [ "${DPKG_MAINTSCRIPT_NAME:-}" = "postinst" ] && [ "$1" = "configure" ]; then
    case $DPKG_MAINTSCRIPT_PACKAGE in
        percona-postgresql-[89].?|percona-postgresql-[1-9]?|percona-postgresql-[1-9]???) # -9.6 -15 -15ee
            . /usr/share/debconf/confmodule
            ;;
    esac
fi
