# Copyright 1999-2008 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# $Id: $

inherit path-manipulation output

DESCRIPTION="Manage postgresql slots"
MAINTAINER="root@localhost"
SVN_DATE='$Date: $'
VERSION=$(svn_date_to_version "${SVN_DATE}" )

### list action

## {{{ list stuff
	describe_list() {
		echo "List available postgresql installations"
	}

	do_list() {
		write_list_start "Available postgresql installations"
		for s in /etc/eselect/postgresql/slots/* ; do
			[[ -d "$s" ]] || continue;
			local slot=$(basename $s)
			local postgres_ebuilds=""
			for src in ${s}/* ; do
				source "$src"
			done
			local kw="${slot}"
			if [[ "$(canonicalise /etc/eselect/postgresql/active)" = "$(canonicalise ${s})" ]] ; then
				kw="$kw <-*"
			fi
			if [[ "$(canonicalise /etc/eselect/postgresql/service)" = "$(canonicalise ${s})" ]] ; then
				kw="$kw <-S"
			fi
			write_kv_list_entry "${kw}" "${postgres_ebuilds//postgresql-/}"
		done
	}
## }}}

### show action

## {{{
	describe_show() {
		echo "Show currently selected PostgreSQL installation"
	}
	do_show() {
		if [[ -r "/etc/eselect/postgresql/active" ]] ; then
			local bn=$(basename $(canonicalise /etc/eselect/postgresql/active))
			local slot=${bn}
			echo "${slot}"
		else
			echo "(none)"
		fi
	}
## }}}

### show-all action

## {{{
	describe_show-all() {
		echo "Show currently selected PostgreSQL service"
	}
	do_show-all() {
		echo "Utilities:  $(do_show)"
		echo "Service:    $(do_show-service)"
	}
## }}}

# show-service action

## {{{
	describe_show-service() {
		echo "Show currently selected postgresql server"
	}
	do_show-service() {
		if [[ -r "/etc/eselect/postgresql/service" ]] ; then
			local bn=$(basename $(canonicalise /etc/eselect/postgresql/service))
			local slot=${bn}
			echo "${slot}"
		else
			echo "(none)"
		fi
	}
## }}}

### set action

## {{{
	describe_set() {
		echo "Set active postgresql installation"
	}

	do_set() {
		local alibdir='/usr/lib/'
		[[ ${#@} -ne 1 ]] && die -q "Only one parameter is expected"
		local slotdir="/etc/eselect/postgresql/slots/${1}"
		[[ -d "${slotdir}" ]] || die -q "No such version installed"
		do_reset
		unset postgres_symlinks
		unset postgres_bindir
		for src in ${slotdir}/* ; do
			[[ -f "${src}" ]] && source ${src}
		done
		local pgconfig="${postgres_bindir}/pg_config"
		[[ -x "${pgconfig}" ]] || die -q "Broken install: no pg_config found"
		local pglibdir="$(${pgconfig} --libdir)"
		[[ -d "${pglibdir}" ]] || die -q "Failed to find postgresql libdir"
		local slinks="${#postgres_symlinks[*]}"
		for l in ${pglibdir}/lib*.{a,so} ; do
			local bn=$(basename $l)
			postgres_symlinks[slinks++]="$l"
			postgres_symlinks[slinks++]="${alibdir}${bn}"
		done
		for (( i=0;i<slinks;i++ )); do
			local s=${postgres_symlinks[i++]};
			local d=${postgres_symlinks[i]};
			if ! [[ -e "${s}" ]] ; then
				write_warning_msg "No file '${s}' to symlink"
				continue
			fi
			if [[ -e "$d" ]] ; then
				[[ -L "$d" ]] || die -q "$d exists and is not a symbolic link"
			fi
		done
		mkdir -p /etc/eselect/postgresql &>/dev/null || die "Failed to create /etc/eselect/postgresql"
		exec 9>/etc/eselect/postgresql/active.links || die "Failed to store list of links"
		ln -sf slots/${1} /etc/eselect/postgresql/active
		for (( i=0;i<slinks;i++ )); do
			local s=${postgres_symlinks[i]};
			(( i++ ));
			local d=${postgres_symlinks[i]};
			rm -f "${d}"
			ln -s "${s}" "${d}"
			echo "${d}" >&9
		done
	}
## }}}

### set-service action

## {{{
	describe_set-service() {
		echo "Set active postgresql service"
	}

	do_set-service() {
		local alibdir='/usr/lib/'
		[[ ${#@} -ne 1 ]] && die -q "Only one parameter is expected"
		local slotdir="/etc/eselect/postgresql/slots/${1}"
		[[ -d "${slotdir}" ]] || die -q "No such version installed"
		do_reset-service
		unset postgres_service
		local p_service="$(for s in ${slotdir}/* ; do source $s ; done ; echo $postgres_service)"
		[[ -x "/etc/init.d/${p_service}" ]] || die -1 "Selected installation doesn't provide PostgreSQL service"
		mkdir -p /etc/eselect/postgresql &>/dev/null || die "Failed to create /etc/eselect/postgresql"
		rm -f /etc/eselect/postgresql/service
		ln -sf slots/${1} /etc/eselect/postgresql/service
		touch /etc/conf.d/${p_service}
	}
## }}}

### set-all action

## {{{
	describe_set-all() {
		echo "Set both active postgresql and corresponding service"
	}

	do_set-all() {
		do_set "$@"
		do_set-service "$@"
	}
## }}}


### reset action

## {{{
	describe_reset() {
		echo "Remove active postgresql installation links"
	}

	do_reset() {
		local alibdir='/usr/lib/'
		if [[ -d "$(canonicalise /etc/eselect/postgresql/active)" ]] ; then
			if [[ -r /etc/eselect/postgresql/active.links ]] ; then
				exec 9</etc/eselect/postgresql/active.links || die "Failed to access the list of links"
				while IFS='' read -u 9 slink ; do
					if [[ -e "$slink" ]] ; then
						if [[ -L "$slink" ]] ; then
							rm -f "${slink}"
						else
							write_warning_msg "$slink exists and is not a symbolic link"
						fi
					fi
				done
				rm -f /etc/eselect/postgresql/active.links
			fi
			rm -f /etc/eselect/postgresql/active
		fi
	}
## }}}

### reset-service action

## {{{
	describe_reset-service() {
		echo "Reset active postgresql service"
	}

	do_reset-service() {
		if [[ -L /etc/eselect/postgresql/service ]] ; then
			local p_service="$(for s in /etc/eselect/postgresql/service/* ; do source $s ; done ; echo "$postgres_service")"
			[[ -e "/etc/conf.d/${p_service}" ]] && touch "/etc/conf.d/${p_service}"
			rm -f /etc/eselect/postgresql/service
		fi
	}
## }}}

### reset-all action

## {{{
	describe_reset-all() {
		echo "Reset both selected PostgreSQL and PostgreSQL serice"
	}

	do_reset-all() {
		do_reset
		do_reset-service
	}
## }}}

## {{{
	describe_update() {
		echo "Update symbolic links"
	}

	do_update() {
		# collect all binaries names
		local binaries="$((
			for s in /etc/eselect/postgresql/slots/* ; do
				[[ -d "$s" ]] || continue;
				local slot=$(basename $s)
				for src in ${s}/* ; do
					source "$src"
				done
				ls -1 ${postgres_bindir}/
			done
		) | sort | uniq)"
		local links="$(find /usr/bin/* -type d -prune -o -lname /usr/lib/eselect-postgresql/binwrapper -print)"
		local i
		for i in ${binaries} ; do
			local lip="/usr/bin/${i}"
			links="$(echo "${links}"|grep -v "^${lip}\$")"
			[[ -L "${lip}" ]] && continue
			[[ -e "${lip}" ]] && die "${lip} exists and is not a symbolic link"
			echo "Creating ${lip} symlink..."
			ln -s /usr/lib/eselect-postgresql/binwrapper "${lip}"
		done
		# cleanup leftovers
		for i in ${links} ; do
			echo "Removing ${i} symlink.."
			rm "${i}"
		done
		if test -L /etc/eselect/postgresql/active -a ! -d /etc/eselect/postgresql/active ; then
			echo "Resetting uninstalled selection"
			do_reset
		fi
		if test -L /etc/eselect/postgresql/service -a ! -d /etc/eselect/postgresql/service ; then
			echo "Resetting uninstalled selection"
			do_reset-service
		fi
	}
## }}}

# vim: ts=4 sw=4 noet fdm=marker