### -*-makefile-*-
###
### Build script for Exim configuration
###
### (c) 2012 Mark Wooding
###

###----- Licensing notice ---------------------------------------------------
###
### 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.
###
### You should have received a copy of the GNU General Public License
### along with this program; if not, write to the Free Software Foundation,
### Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

###--------------------------------------------------------------------------
### Utility macros.

## Silent-rules machinery.
V = 0
v_tag = $(call v_tag_$V,$1)
v_tag_0 = @printf "  %-6s %s\n" $1 $@;

V_GEN = $(call v_tag,GEN)
V_AT = $(V_AT_$V)
V_AT_0 = @

## Splitting things at slashes -- don't leave the slash.
dir-nosl = $(patsubst %/,%,$(dir $1))

###--------------------------------------------------------------------------
### Introductory machinery.

all:
.SECONDEXPANSION: # sorry

CLEANFILES		+= $(TARGETS)

###--------------------------------------------------------------------------
### Main source files.

## There's a base set of files, and a number of optional modules.  A
## collection of modules is called a `mode', and we generate an output file
## for each required mode.

EARLY			 = defs.m4 divmap.m4 config.m4
MAIN			 = lists.m4 base.m4

MODES			 =

MODES			+= satellite
OPTIONS_satellite	 = satellite.m4 sat-rewrite.m4

MODES			+= srv
CONF_srv		 = sysdomains=
OPTIONS_srv		 = exchange.m4 spam.m4 vhost.m4 sat-rewrite.m4

MODES			+= hub
OPTIONS_hub		 = auth.m4 exchange.m4 local.m4 spam.m4
OPTIONS_hub		+= user-spam.m4 vhost.m4

MODES			+= usersat
OPTIONS_usersat		 = auth.m4 local.m4 satellite.m4

-include local.mk

###--------------------------------------------------------------------------
### Resolving what needs to be built.

HOST_MODES		+= $(foreach m, $(MODES), \
				$(foreach h, $(HOSTS_$m), $h/$m))

CONFIGS			 = $(foreach m, $(MODES), exim4-$m.conf)
TARGETS			+= $(CONFIGS)
$(CONFIGS): exim4-%.conf: $(EARLY) $$(HOOKS_$$*) $(MAIN) $$(OPTIONS_$$*)
	$(V_GEN)m4 -P -DMODE=$* $(CONF_$*:%=-DCONF_%) $^ >$@.new
	$(V_AT)$(CHECK_$*)exim4 -C$$(pwd)/$@.new -bV >/dev/null
	$(V_AT)mv $@.new $@

all: $(TARGETS)

host-mode		 = $(notdir $(filter $1/%, $(HOST_MODES)))

HOSTS			 = $(sort $(call dir-nosl, $(HOST_MODES)))

###--------------------------------------------------------------------------
### Propagating configuration to remote hosts.

THISHOST		 = $(shell hostname)
OTHERHOSTS		 = $(filter-out $(THISHOST), $(HOSTS))

ROOT			 = sudo

install_rune		 = \
	exim4 -C/etc/exim4/exim4.conf.new -bV >/dev/null && \
	mv /etc/exim4/exim4.conf.new /etc/exim4/exim4.conf && \
	service exim4 reload

install/$(THISHOST): exim4-$(call host-mode,$(THISHOST)).conf
	$(ROOT) cp $< /etc/exim4/exim4.conf.new
	$(ROOT) sh -c '$(install_rune)'

$(addprefix install/, $(OTHERHOSTS)): \
install/%: exim4-$$(call host-mode,$$*).conf
	$(ROOT) scp $< root@$*:/etc/exim4/exim4.conf.new
	$(ROOT) ssh root@$* '$(install_rune)'

install: $(addprefix install/, $(HOSTS))

clean:; rm -f $(CLEANFILES)
.PHONY: clean

###----- That's all, folks --------------------------------------------------