### -*-makefile-*-
###
### Main maintenance script for chroots
###
### (c) 2018 Mark Wooding
###

###----- Licensing notice ---------------------------------------------------
###
### This file is part of the distorted.org.uk chroot maintenance tools.
###
### distorted-chroot 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.
###
### distorted-chroot 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 distorted-chroot.  If not, write to the Free Software
### Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
### USA.

all::
clean::
check::
.PHONY: all clean check
.SECONDEXPANSION: #sorry

###--------------------------------------------------------------------------
### Configuration.

CONFIG_VARS		 =

## Level of pickiness to aspire to.
NOTIFY_FATAL		 = 1

## Path to this working tree.
CONFIG_VARS		+= HERE
HERE			 = $(abspath .)

## Volume group from which to allocate chroot volumes and snapshots.
CONFIG_VARS		+= VG LVPREFIX
VG			 = vg-$(shell hostname)
LVPREFIX		 =

## Logical volume size, as an LVM option.
CONFIG_VARS		+= LVSZ SNAPOPT
LVSZ			 = -L8G
SNAPOPT			 = -L8G

## Debian mirror.
CONFIG_VARS		+= DEBMIRROR
DEBMIRROR		 = http://deb.debian.org/debian/

## APT sources configurations.  (Also, $($d_APTSRC) for each $d in $(DISTS).)
CONFIG_VARS		+= APTSRC
APTSRC			 = etc/aptsrc.conf $(wildcard etc/aptsrc.local.conf)

## APT configuration fragment names.  These will be linked into
## `/etc/apt/apt.conf.d' in each chroot.  To put a fragment f in a surprising
## place, set $($f_APTCONFSRC).
CONFIG_VARS		+= APTCONF
APTCONF_DIR		 = etc/apt-conf.d
APTCONF			 = $(notdir $(wildcard $(APTCONF_DIR)/[0-9]*[!~]))

## Proxy setting.
CONFIG_VARS		+= PROXY
PROXY			:= $(shell \
	eval $$(apt-config $(foreach a,$(APTCONF), -c$(APTCONF_DIR)/$a) \
		shell proxy Acquire::http::proxy); \
	case $${proxy+t} in (t) echo "$$proxy" ;; (*) echo nil ;; esac)

## Debian distributions to support.
CONFIG_VARS		+= PRIMARY_DIST DISTS
PRIMARY_DIST		 = stretch
DISTS			 = $(PRIMARY_DIST) buster bullseye sid

## Host's native architecture(s).
CONFIG_VARS		+= MYARCH NATIVE_ARCHS
MYARCH			 = $(shell dpkg --print-architecture)
OTHERARCHS		 = $(shell dpkg --print-foreign-architectures)
NATIVE_ARCHS		 = $(MYARCH) $(OTHERARCHS)

## Foreign (emulated) architectures to support.
CONFIG_VARS		+= FOREIGN_ARCHS
FOREIGN_ARCHS		 =

## Master lists of chroots to build and maintain.
NATIVE_CHROOTS		 = $(foreach a,$(NATIVE_ARCHS), \
				$(foreach d,$(or $($a_DISTS) $(DISTS)), \
					$d-$a))
FOREIGN_CHROOTS		 = $(foreach a,$(FOREIGN_ARCHS), \
				$(foreach d,$(or $($a_DISTS) $(DISTS)), \
					$d-$a))

## Extra packages to be installed in chroots.
CONFIG_VARS		+= BASE_PACKAGES NATIVE_BASE_PACKAGES FOREIGN_BASE_PACKAGES
BASE_PACKAGES		 = ccache
BASE_PACKAGES		+= eatmydata fakeroot
BASE_PACKAGES		+= locales tzdata
BASE_PACKAGES		+= libfile-fcntllock-perl
NATIVE_BASE_PACKAGES	 = build-essential
FOREIGN_BASE_PACKAGES	 =

## Local packages to be compiled and installed in chroots.  Archives can be
## found in `pkg/'.
LOCALPKGS		 = mLib checkpath

## Which host architecture to use for foreign architectures.  It turns out
## that it's best to use a Qemu with the same host bitness as the target
## architecture; otherwise it has to do a difficult job of converting
## arguments and results between kernel ABI flavours.
32BIT_QEMUHOST		 = $(or $(filter i386,$(NATIVE_ARCHS)),$(TOOLSARCH))
64BIT_QEMUHOST		 = $(or $(filter amd64,$(NATIVE_ARCHS)),$(TOOLSARCH))

CONFIG_VARS		+= $(foreach a,$(FOREIGN_ARCHS), $a_QEMUHOST)
armel_QEMUHOST		 = $(32BIT_QEMUHOST)
armhf_QEMUHOST		 = $(32BIT_QEMUHOST)
arm64_QEMUHOST		 = $(64BIT_QEMUHOST)
i386_QEMUHOST		 = $(32BIT_QEMUHOST)
amd64_QEMUHOST		 = $(64BIT_QEMUHOST)

## Qemu architecture names.  These tell us which Qemu binary to use for a
## particular Debian architecture.
CONFIG_VARS		+= $(foreach a,$(FOREIGN_ARCHS), $a_QEMUARCH)
armel_QEMUARCH		 = arm
armhf_QEMUARCH		 = arm
arm64_QEMUARCH		 = aarch64
i386_QEMUARCH		 = i386
amd64_QEMUARCH		 = x86_64

## Alias mapping for chroots.
CONFIG_VARS		+= $(foreach d,$(DISTS), $d_ALIASES)
stretch_ALIASES		 = oldstable
buster_ALIASES		 = stable
bullseye_ALIASE		 = testing
sid_ALIASES		 = unstable

## Which host architecture to use for commonly used tools in foreign chroots.
CONFIG_VARS		+= TOOLSARCH
TOOLSARCH		 = $(MYARCH)

## A directory in which we can maintain private files and state.
CONFIG_VARS		+= STATE
STATE			 = state

## A directory which will be spliced into chroots as `/usr/local.schroot/'.
## This will be our primary point of contact with the chroot.
CONFIG_VARS		+= LOCAL
LOCAL			 = local.schroot

## How to run a command as a privileged user.
ROOTLY			 = sudo

## Files to be copied into a chroot from the host.
SCHROOT_COPYFILES	 = /etc/resolv.conf
SCHROOT_NSSDATABASES	 = passwd shadow group gshadow

## Local configuration hook.
-include local.mk

## All chroot names.
CONFIG_VARS		+= ALL_ARCHS ALL_CHROOTS
ALL_ARCHS		 = $(NATIVE_ARCHS) $(FOREIGN_ARCHS)
ALL_CHROOTS		 = $(NATIVE_CHROOTS) $(FOREIGN_CHROOTS)

###--------------------------------------------------------------------------
### Utilities.

## Hack to force rebuilding.
_force:
.PHONY: _force

## Hack to not delimit function arguments.  (Ugh!)
comma			 = ,

## Silent-rules machinery.
V			 = 0
V_AT			 = $(V_AT_$V)
V_AT_0			 = @
v_print			 = $(call v_print_$V,$1,$2)
v_print_0		 = printf "  %-8s %s\n" "$1" $(call squote,$2);
v_tag			 = $(V_AT)$(call v_print,$1,$@)
v_log			 = $(call v_log_$V,$1,$2)
v_log_			 = $(call v_log_1,$1,$2)
v_log_0			 = $2 >log/$1.log 2>&1
v_log_1			 = $(call catchrc,$(call throwrc,$2) 2>&1 | tee log/$1.log)
v_echo			 = $(call v_echo_$V,$1)
v_echo_0		 = :
v_echo_1		 = printf "%s\n" $1
CLEANFILES		+= log/*.log

## Oh, shut up.
SILENCE_LVM		 = \
	LVM_SUPPRESS_FD_WARNINGS=1; export LVM_SUPPRESS_FD_WARNINGS

##	$(call catchrc,...$(call throwrc,CMD)...)
##
## Catch the exit status of some subpart of a complicated shell rune.
catchrc			 = (exec 3>&1; exit $$({ $1; } 4>&1 >&3 3>&-))
throwrc			 = { $1; echo $$? >&4; }

##	$(call squote,TXT)
##
## Single-quote TXT.
squote			 = '$(subst ','\\'',$1)'

##	$(call chroot-dist,D-A) -> D
##	$(call chroot-arch,D-A) -> A
##
## Parse chroot descriptions.
chroot-dist		 = $(patsubst %/,%,$(dir $(subst -,/,$1)))
chroot-arch		 = $(notdir $(subst -,/,$1))

##	$(call package-dir-name,P-V) -> P
##	$(call package-dir-version,P-V) -> V
##
## Parse (source) package directory names.
package-dir-name	 = $(sort $(foreach p,$(LOCALPKGS),$(if $(filter $p-$($p_VERSION),$1),$p)))
package-dir-version	 = $($(call package-dir-name,$1)_VERSION)

##	$(call package-dir,P-V.A) -> P-V
##	$(call package-name,P-V.A) -> P
##	$(call package-version,P-V.A) -> V
##	$(call package-arch,P-V.A) -> A
##
## Parse package stamp names.
package-dir		 = $(basename $1)
package-name		 = $(call package-dir-name,$(call package-dir,$1))
package-version		 = $(call package-dir-version,$(call package-dir,$1))
package-arch		 = $(patsubst .%,%,$(suffix $1))

##	$(call native-chroot-p,D-A) -> D | <empty>
##
## Answer whether D-A is a native chroot.
native-chroot-p		 = $(filter $(call chroot-arch,$1),$(NATIVE_ARCHS))

##	$(call chroot-qemuhost,D-A) -> AA
##
## Answer the apporopriate Qemu host architecture for foreign chroot D-A.
chroot-qemuhost		 = $($(call chroot-arch,$1)_QEMUHOST)

##	$(call chroot-deps,PRE,D-A) -> PREDD-AA ... | <empty>
##
## Answer a list of additional dependencies for the chroot D-A: specifically,
## if D-A is foreign then include PRE/DD-AA entries for the tools
## architecture, and Qemu host architecture (if that's different).
chroot-deps		 = $(if $(call native-chroot-p,$2),, \
				$(addprefix $1$(call chroot-dist,$2)-,\
					$(sort $(TOOLSARCH) \
					       $(call chroot-qemuhost,$2))))

## Substituting placeholders in files.
SUBSTITUTIONS		:= local=$(shell realpath $(LOCAL))
SUBSTITUTIONS		+= primary-dist=$(PRIMARY_DIST)
subst-file		 = { \
	echo "$1 GENERATED by distorted-chroot: do not edit"; \
	substs=""; \
	for v in $(SUBSTITUTIONS); do \
	  var=$${v%%=*} value=$${v\#*=}; \
	  substs="$$substs s@$$var@$$valueg;"; \
	done; \
	sed "$$substs"; \
}

###	$(call symlink-ok-p,LINK,DEST)
###
### Expand to `t' if LINK is a symbolic link to DEST, and empty otherwise.
symlink-ok-p             = $(shell \
	case $$(readlink 2>/dev/null $(patsubst %/,%,$1)) in ($2) echo t ;; esac)

###	$(call general-notify,SEV,COLOUR,PREFIX,MSG)
###
### Report a message, highlighted in the right way, and maybe fail
general-notify		 = { \
	echo "$$(tput bold; tput setaf $2)$3 "$4"$$(tput sgr0; tput op)"; \
	if [ "$1" -le "$(NOTIFY_FATAL)" ]; then exit 2; fi; \
}

###	$(call report/SEV,MSG)
###
### Report a notification of a particular severity.
notify/INFO		 = $(call general-notify,3,6,---,$1)
notify/WARN		 = $(call general-notify,2,5,???,$1)
notify/ERR		 = $(call general-notify,1,1,!!!,$1)

##	$(call check,SEV,MSG,UNLESS)
##
## If UNLESS completes successfully, all is OK; otherwise print MSG to stderr
## and fail.
check			 = @{ \
	$(call v_echo,'check: '$(call squote,$3)''); \
	if ! { $3; }; then $(call notify/$1,$2); fi; \
}

##	$(call check-executable,SEV,PATH)
##
## Verify that PATH is an executable program.
check-executable	 = $(call check,$1,"\`$2' is not an executable", \
	[ -x "$2" ])

##	$(call check-mountpoint,SEV,DIR)
##
## Verify that DIR is a mountpoint.
check-mountpoint	 = $(call check,$1,"\`$2' is not a mount point", \
	mountpoint -q "$2")

##	$(call check-symlink,SEV,LINK,DEST)
##
## Verify that LINK is a symbolic link pointing to DEST.
check-symlink		 = $(call check,$1,"\`$2' is not a link to \`$3'", \
	[ -L "$2" ] && [ "$$(readlink "$2")" = "$3" ])

###--------------------------------------------------------------------------
### Scripts.

SCRIPTS			+= mkbuildchroot
SCRIPTS			+= mkchrootconf
SCRIPTS			+= install-cross-tools update-cross-tools

SUBST_SCRIPTS		 = $(addprefix $(STATE)/bin/,$(SCRIPTS))
all:: $(SUBST_SCRIPTS)
$(SUBST_SCRIPTS): $(STATE)/bin/%: bin/% $(STATE)/config.sh
	$(V_AT)mkdir -p $(dir $@)
	$(call v_tag,SUBST){ \
		sed \
		-e '2i### GENERATED by distorted-chroot: do not edit' \
		-e '/@@@config@@@/ {' \
			-e 'r $(STATE)/config.sh' \
			-e 'd'\
		-e '}' $<; \
	} >$@.new && chmod +x $@.new && mv $@.new $@

###--------------------------------------------------------------------------
### APT configuration.

## In a chroot, `/etc/apt/sources.list' links to
## `/usr/local.schroot/etc/apt/sources.$d' for the appropriate distribution.
APT_SOURCES		 = $(foreach d,$(DISTS), $(LOCAL)/etc/apt/sources.$d)
CLEANFILES		+= $(APT_SOURCES)
all:: $(APT_SOURCES)

$(foreach d,$(DISTS), $(STATE)/etc/apt/aptsrc.$d): $(STATE)/etc/apt/aptsrc.%:
	$(V_AT)mkdir -p $(dir $@)
	$(call v_tag,GEN){ \
	  echo "### -*-conf-*- GENERATED by distorted-chroot: do not edit"; \
	  echo "subscribe"; \
	  echo "	debian : $*"; \
	} >$@.new && mv $@.new $@

$(APT_SOURCES): $(LOCAL)/etc/apt/sources.%: \
		$$(APTSRC) $$($$*_APTSRC) $$(STATE)/etc/apt/aptsrc.$$*
	$(V_AT)mkdir -p $(dir $@)
	$(call v_tag,GEN)bin/mkaptsrc \
		$(APTSRC) $($*_APTSRC) $(STATE)/etc/apt/aptsrc.$* \
		>$@.new && mv $@.new $@

## In a chroot, a link `/etc/apt/apt.conf.d/FOO' is created for each file in
## `/usr/local.schroot/etc/apt/apt.conf.d/FOO'.
APT_CONFIGS	       = $(addprefix $(LOCAL)/etc/apt/apt.conf.d/,$(APTCONF))
all:: $(APT_CONFIGS)
$(APT_CONFIGS): $(LOCAL)/etc/apt/apt.conf.d/%: \
		$$(or $$($$*_APTCONFSRC) $$(APTCONF_DIR)/$$*)
	$(V_AT)mkdir -p $(dir $@)
	$(call v_tag,COPY)cp $< $@.new && mv $@.new $@
clean::; rm -f $(APT_CONFIGS)

###--------------------------------------------------------------------------
### Build hacks.

check::; $(call check-executable,ERR,/usr/bin/eatmydata)

EATMYDATA_HACKS		+= apt-get aptitude dpkg
SYMLINK_EATMYDATA_HACKS	 = $(addprefix $(LOCAL)/hacks/,$(EATMYDATA_HACKS))
all:: $(SYMLINK_EATMYDATA_HACKS)
$(SYMLINK_EATMYDATA_HACKS): $(LOCAL)/hacks/%: \
		$$(if $$(call symlink-ok-p,$$@,/usr/bin/eatmydata),,_force)
	$(V_AT)mkdir -p $(dir $@)
	$(call v_tag,SYMLINK)ln -sf /usr/bin/eatmydata $@.new && mv $@.new $@
clean::; rm -f $(SYMLINK_EATMYDATA_HACKS)

SCRIPT_HACKS		+= buildwrap
COPY_SCRIPT_HACKS	 = $(addprefix $(LOCAL)/hacks/,$(SCRIPT_HACKS))
all:: $(COPY_SCRIPT_HACKS)
$(COPY_SCRIPT_HACKS): $(LOCAL)/hacks/%: bin/%
	$(V_AT)mkdir -p $(dir $@)
	$(call v_tag,COPY)cp $< $@.new && mv $@.new $@
clean::; rm -f $(COPY_SCRIPT_HACKS)

###--------------------------------------------------------------------------
### `schroot' and `sbuild' configuration.

all:: schroot-config
schroot-config::
.PHONY: schroot-config

check::; $(call check-mountpoint,WARN,/var/lib/sbuild/build)
check::; $(call check-symlink,WARN,/build,/var/lib/sbuild/build)
check::; $(call check-symlink,ERR,/schroot,/run/schroot/mount)

%print-varlist		 = { \
	echo "\#\#\# -*-sh-*- GENERATED by distorted-chroot: do not edit"; \
	$(foreach v,$1, echo $v=\''$(subst ','\'\\\'\'',$($v))'\';) \
} #'
schroot-config_HASH	:= \
	$(shell $(call %print-varlist,$(CONFIG_VARS)) | \
		sha256sum | cut -c1-32)
schroot-config_FILE	 = $(STATE)/config.sh-$(schroot-config_HASH)
$(schroot-config_FILE):
	$(V_AT)mkdir -p $(STATE)
	$(V_AT)rm -f $(STATE)/config.sh-*
	$(call v_tag,STAMP)$(call %print-varlist,$(CONFIG_VARS)) \
		>$@.new && mv $@.new $@

schroot-config:: $(STATE)/config.sh
$(STATE)/config.sh: $(schroot-config_FILE)
	$(call v_tag,SYMLINK)ln -sf $(notdir $<) $@

schroot-config:: $(STATE)/etc/schroot/sbuild.schroot
$(STATE)/etc/schroot/sbuild.schroot: $(STATE)/bin/mkchrootconf
	$(V_AT)mkdir -p $(dir $@)
	$(call v_tag,GEN)$(STATE)/bin/mkchrootconf >$@.new && \
		$(ROOTLY) chown root:root $@.new && mv $@.new $@
check::; $(call check-symlink,WARN,/etc/schroot/chroot.d/sbuild,$(HERE)/$(STATE)/etc/schroot/sbuild.schroot)

schroot-config:: $(STATE)/etc/schroot/sbuild.profile/copyfiles
$(STATE)/etc/schroot/sbuild.profile/copyfiles: $(schroot-config_STAMP)
	$(V_AT)mkdir -p $(dir $@)
	$(call v_tag,GEN){ \
	  echo "### -*-conf-*- GENERATED by distorted-chroot: do not edit"; \
	  for i in $(SCHROOT_COPYFILES); do echo "$$i"; done; \
	} >$@.new && mv $@.new $@

schroot-config:: $(STATE)/etc/schroot/sbuild.profile/nssdatabases
$(STATE)/etc/schroot/sbuild.profile/nssdatabases: $(schroot-config_STAMP)
	$(V_AT)mkdir -p $(dir $@)
	$(call v_tag,GEN){ \
	  echo "### -*-conf-*- GENERATED by distorted-chroot: do not edit"; \
	  for i in $(SCHROOT_NSSDATABASES); do echo "$$i"; done; \
	} >$@.new && mv $@.new $@

schroot-config:: $(STATE)/etc/schroot/sbuild.profile/fstab
$(STATE)/etc/schroot/sbuild.profile/fstab: \
		etc/sbuild.fstab.in $(schroot-config_STAMP)
	$(V_AT)mkdir -p $(dir $@)
	$(call v_tag,SUBST)$(call subst-file,### -*-conf-*-) \
		<$< >$@.new && mv $@.new $@

check::; $(call check-symlink,WARN,/etc/schroot/sbuild,$(HERE)/$(STATE)/etc/schroot/sbuild.profile)

schroot-config:: $(STATE)/etc/sbuild.conf
$(STATE)/etc/sbuild.conf: etc/sbuild.conf.in $(schroot-config_STAMP)
	$(V_AT)mkdir -p $(dir $@)
	$(call v_tag,SUBST)$(call subst-file,### -*-perl-*-) \
		<$< >$@.new && mv $@.new $@

SCHROOT_SCRIPTS		+= 11private
SCHROOT_SCRIPTS		+= 15binfmt
SCHROOT_SCRIPTS		+= 51chrootenv
COPY_SCHROOT_SCRIPTS	 = $(addprefix $(STATE)/etc/schroot/setup.d/,$(SCHROOT_SCRIPTS))
schroot-config:: $(COPY_SCHROOT_SCRIPTS)
$(COPY_SCHROOT_SCRIPTS): \
		$(STATE)/etc/schroot/setup.d/%: etc/schroot-scripts/%
	$(V_AT)mkdir -p $(dir $@)
	$(call v_tag,COPY)cp $< $@.new && mv $@.new $@

CHECK_SCHROOT_SCRIPTS	 = $(addprefix check-script/,$(SCHROOT_SCRIPTS))
check:: $(CHECK_SCHROOT_SCRIPTS)
$(CHECK_SCHROOT_SCRIPTS): check-script/%:
	$(call check-symlink,WARN,/etc/schroot/setup.d/$*,$(HERE)/$(STATE)/etc/schroot/setup.d/$*)
.PHONY: $(addprefix check-script/,$(SCHROOT_SCRIPTS))

###--------------------------------------------------------------------------
### `/usr/local/' structure.

LOCAL_COMMON_DIRS	 = share/ src/
all:: $(foreach d,$(LOCAL_COMMON_DIRS),$(LOCAL)/$d)
$(foreach d,$(LOCAL_COMMON_DIRS),$(LOCAL)/$d):
	$(V_AT)mkdir -p $(dir $(patsubst %/,%,$@))
	$(call v_tag,MKDIR)mkdir $@

LOCAL_ARCH_DIRS		 = bin/ etc/ games/ include/ lib/ libexec/ sbin/
LOCAL_ARCH_LINKS	 = man
man_LINKDEST		 = share/man
all:: $(foreach a,$(ALL_ARCHS),\
	$(LOCAL)/$a/ \
	$(foreach d,$(LOCAL_ARCH_DIRS),$(LOCAL)/$a/$d) \
	$(foreach d,$(LOCAL_ARCH_LINKS),$(LOCAL)/$a/$d) \
	$(foreach d,$(LOCAL_COMMON_DIRS),$(LOCAL)/$a/$d))

$(foreach a,$(ALL_ARCHS),$(LOCAL)/$a/):
	$(call v_tag,MKDIR)mkdir $@
$(foreach a,$(ALL_ARCHS),\
  $(foreach d,$(LOCAL_ARCH_DIRS),$(LOCAL)/$a/$d)):
	$(V_AT)mkdir -p $(dir $(patsubst %/,%,$@))
	$(call v_tag,MKDIR)mkdir $@
$(foreach a,$(ALL_ARCHS),\
  $(foreach d,$(LOCAL_ARCH_LINKS),$(LOCAL)/$a/$d)): \
		$$(if $$(call symlink-ok-p,$$@,$$($$(notdir $$@)_LINKDEST)),,_force)
	$(V_AT)mkdir -p $(notdir $@)
	$(call v_tag,SYMLINK)ln -sf $($(notdir $@)_LINKDEST) $@
$(foreach a,$(ALL_ARCHS),\
  $(foreach d,$(LOCAL_COMMON_DIRS),$(LOCAL)/$a/$d)): \
		$$(if $$(call symlink-ok-p,$$@,../$$(notdir $$(patsubst %/,%,$$@))),,_force)
	$(V_AT)mkdir -p $(dir $(patsubst %/,%,$@))
	$(call v_tag,SYMLINK)ln -sf ../$(notdir $(patsubst %/,%,$@)) $(patsubst %/,%,$@)

###--------------------------------------------------------------------------
### Constructing chroots.

chroot-stamp		 = $(addprefix $(STATE)/stamp/chroot.,$1)
BUILD_CHROOTS		 = $(addprefix chroot/,$(ALL_CHROOTS))
CHROOT_STAMPS		 = $(call chroot-stamp,$(ALL_CHROOTS))
setup-chroots: $(BUILD_CHROOTS)
$(BUILD_CHROOTS): chroot/%: $(STATE)/stamp/chroot.%
.PHONY: setup-chroots $(BUILD_CHROOTS)

$(CHROOT_STAMPS): $(STATE)/stamp/chroot.%: \
		$$(call chroot-deps,$(STATE)/stamp/cross-tools.,$$*)
	$(V_AT)mkdir -p $(dir $@) log/
	$(MAKE) \
		$(STATE)/bin/mkbuildchroot $(STATE)/bin/install-cross-tools \
		$(STATE)/etc/schroot/sbuild.schroot
	$(call v_tag,CHROOT)$(call v_log,setup-chroot.$*, \
		$(SILENCE_LVM); \
		$(ROOTLY) $(STATE)/bin/mkbuildchroot \
			$(call chroot-dist,$*) $(call chroot-arch,$*))
	$(V_AT)touch $@

UPDATE_CHROOTS		 = $(addprefix update/,$(ALL_CHROOTS))
update-chroots: $(UPDATE_CHROOTS)
$(UPDATE_CHROOTS): update/%: $(STATE)/stamp/chroot.%
	$(V_AT)mkdir -p log/
	$(MAKE) $(STATE)/bin/install-cross-tools
	$(call v_tag,UPDATE)$(call v_log,update-chroot.$*, { \
		schroot -uroot -csource:$(LVPREFIX)$* -- \
			apt-get update && \
		schroot -uroot -csource:$(LVPREFIX)$* -- \
			apt-get -y dist-upgrade && \
		schroot -uroot -csource:$(LVPREFIX)$* -- \
			apt-get -y autoremove && \
		schroot -uroot -csource:$(LVPREFIX)$* -- \
			apt-get -y clean && \
		$(if $(filter $*,$(FOREIGN_CHROOTS)), \
			$(ROOTLY) $(STATE)/bin/install-cross-tools \
				$(call chroot-dist,$*) \
				$(call chroot-arch,$*), \
			:); \
	})
.PHONY: update-chroots $(UPDATE_CHROOTS)

cross-tools-stamp	 = $(addprefix $(STATE)/stamp/cross-tools.,$1)
CROSS_TOOLS		 = $(addprefix cross-tools/,$(NATIVE_CHROOTS))
UPDATE_CROSS_TOOLS	 = $(addprefix update-cross-tools/,$(NATIVE_CHROOTS))
cross-tools: $(CROSS_TOOLS)
update-cross-tools: $(UPDATE_CROSS_TOOLS)
$(CROSS_TOOLS): cross-tools/%: $(STATE)/stamp/cross-tools.%
define updcross
	$(V_AT)mkdir -p log/
	$(MAKE) $(STATE)/bin/update-cross-tools
	$(call v_tag,UPDCROSS)$(call v_log,update-cross-tools.$*, \
		$(STATE)/bin/update-cross-tools \
			$(call chroot-dist,$*) \
			$(call chroot-arch,$*))
	$(V_AT)touch $(call cross-tools-stamp,$*)
endef
$(call cross-tools-stamp,$(NATIVE_CHROOTS)): $(STATE)/stamp/cross-tools.%: \
		$$(call chroot-stamp,$$*)
	$(V_AT)mkdir -p $(dir $@)
	$(updcross)
$(UPDATE_CROSS_TOOLS): update-cross-tools/%: \
		$$(call chroot-stamp,$$*) _force
	$(updcross)
.PHONY: cross-tools update-cross-tools $(CROSS_TOOLS) $(UPDATE_CROSS_TOOLS)

###--------------------------------------------------------------------------
### Installing basic custom software.

$(foreach p,$(LOCALPKGS), $(eval $p_VERSION := $(shell \
	set -- pkg/$p-[0-9]*.tar.gz; \
	case $$#,$$1 in \
	  (1,*\**) echo "NOT-FOUND"; exit 2 ;; \
	  (1,*) v=$${1#pkg/$p-}; v=$${v%.tar.gz}; echo "$$v" ;; \
	  (*) echo "AMBIGUOUS"; exit 2 ;; \
	esac)))

pkg-stamp		 = \
	$(foreach p,$1,$(STATE)/stamp/package.$p-$($p_VERSION).$2)
unpack-pkg-stamp	 = \
	$(foreach p,$1,$(STATE)/stamp/unpack.$p-$($p_VERSION))
PACKAGE_STAMPS		 = \
	$(foreach a,$(ALL_ARCHS),$(call pkg-stamp,$(LOCALPKGS),$a))
INSTALL_PACKAGES	 = $(addprefix install/,$(LOCALPKGS))
install-packages: $(INSTALL_PACKAGES)
$(INSTALL_PACKAGES): install/%: \
	$$(foreach a,$$(ALL_ARCHS),$$(call pkg-stamp,$$*,$$a))

$(foreach p,$(LOCALPKGS),$(call unpack-pkg-stamp,$p)): \
		$(STATE)/stamp/unpack.%: pkg/%.tar.gz
	$(V_AT)mkdir -p $(dir $@) $(LOCAL)/src/
	$(call v_tag,UNPACK){ \
		set -e; \
		p=$(call package-dir-name,$*); \
		v=$(call package-dir-version,$*); \
		cd $(LOCAL)/src/; \
		$(ROOTLY) rm -rf $$p-*; \
		mkdir $$p-$$v.unpack; \
		(cd $$p-$$v.unpack && tar xf $(HERE)/$<); \
		mv $$p-$$v.unpack/$$p-$$v $$p-$$v; \
		rmdir $$p-$$v.unpack/; \
		cd $(HERE); \
		touch $@; \
	}

$(PACKAGE_STAMPS): $(STATE)/stamp/package.%: \
		$$(call unpack-pkg-stamp,$$(call package-name,$$*)) \
		$$(call chroot-stamp,$$(PRIMARY_DIST)-$$(call package-arch,$$*))
	$(V_AT)mkdir -p $(dir $@) log/
	$(call v_tag,BUILD)$(call v_log,install-package.$*, { \
		$(SILENCE_LVM); \
		schroot -uroot -c$(LVPREFIX)$(PRIMARY_DIST)-$(call package-arch,$*) -- \
		sh -exc ' \
			mount -oremount$(comma)rw /usr/local.schroot; \
			eatmydata apt-get update; \
			eatmydata apt-get -y install pkg-config; \
			p=$(call package-name,$*); \
			v=$(call package-version,$*); \
			a=$(call package-arch,$*); \
			cd /usr/local/src/$$p-$$v/; \
			rm -rf build.$$a/; \
			mkdir build.$$a/; \
			cd build.$$a/; \
			../configure PKG_CONFIG_PATH=/usr/local/lib/pkgconfig.hidden; \
			make -j4; \
			make install; \
			mkdir -p /usr/local/lib/pkgconfig.hidden; \
			mv /usr/local/lib/pkgconfig/*.pc /usr/local/lib/pkgconfig.hidden || :' && \
		schroot -uroot -csource:$(LVPREFIX)$(PRIMARY_DIST)-$(call package-arch,$*) -- \
			ldconfig; \
	})
	$(V_AT)touch $@

###--------------------------------------------------------------------------
### Other maintenance targets.

show:; : $x

clean::
	rm -f $(CLEANFILES)
	rm -rf $(STATE)

realclean:: clean
	rm -rf $(LOCAL)

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