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# Copyright 2015-2017 Luke Shumaker <lukeshu@sbcglobal.net>.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 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 Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

include config.mk
include $(topsrcdir)/build-aux/Makefile.head.mk

files.src.src := $(filter-out go/golang.org/x/sys/plan9/% go/golang.org/x/sys/windows/%,$(files.src.src))
var = .var.
programs = nshd nshd-setuid nshd-tester common.rb
scripts = $(filter-out %.c %.o $(programs) common.rb common.rb.in,$(notdir $(wildcard $(srcdir)/bin/*)))

.PHONY: FORCE
.SECONDARY:
.DELETE_ON_ERROR:

#
# Go language noise

CGO_CPPFLAGS = $(CPPFLAGS) -U_FORTIFY_SOURCE
CGO_CFLAGS = $(CFLAGS) -O0 -Wno-unused-parameter
CGO_ENABLED = 1

cgo_variables = CGO_ENABLED CGO_CFLAGS CGO_CPPFLAGS CGO_CXXFLAGS CGO_LDFLAGS CC CXX
$(foreach v,$(cgo_variables),$(eval $v ?=))
export $(cgo_variables)

$(outdir)/.gopath/src:
	rm -rf -- $(@D)
	mkdir $(@D)
	ln -sr $(srcdir)/go $@
	touch $@

#
# Generate (pre-tarball)

files.src.gen += LICENSE.lgpl-2.1.txt LICENSE.gpl-2.txt LICENSE.apache-2.0.txt

$(srcdir)/LICENSE.lgpl-2.1.txt: $(NET)
	curl https://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt > $@
$(srcdir)/LICENSE.gpl-2.txt: $(NET)
	curl https://www.gnu.org/licenses/old-licenses/gpl-2.0.txt > $@
$(srcdir)/LICENSE.apache-2.0.txt: $(NET)
	curl https://www.apache.org/licenses/LICENSE-2.0 > $@
$(srcdir)/LICENSE.wtfpl-2.txt: $(NET)
	curl http://www.wtfpl.net/txt/copying/ > $@

files.generate: go-generate
go-generate: .gopath
	+GOPATH=$(abspath $(outdir)/.gopath) go generate git.lukeshu.com/...
.PHONY: go-generate
at.targets += go-generate

#
# Build (post-tarball)

files.out.all += $(addprefix bin/,$(programs)) nshd.service nshd.sysusers
files.out.int += bin/*.o .gopath/ .gopath/* .tmp* .var*

# Dependencies
$(outdir)/bin/nshd-setuid: -ldl
$(outdir)/nshd.service: $(var)user $(var)bindir
$(outdir)/nshd.sysusers: $(var)user
$(outdir)/bin/common.rb: $(var)conf_file

$(outdir)/.gopath/bin/cmd-nshd: \
  $(outdir)/go/cmd-nshd/main.go \
  $(outdir)/go/parabola_hackers/users.go \
  $(outdir)/go/parabola_hackers/passwords.go
$(outdir)/go/cmd-nshd/main.go: $(var)conf_file
$(outdir)/go/parabola_hackers/users.go: $(var)bindir
$(outdir)/go/parabola_hackers/passwords.go: $(var)shadow_file

# Go: copy out of .gopath
$(outdir)/bin/nshd: \
$(outdir)/bin/%: $(outdir)/.gopath/bin/cmd-%
	cp -T $< $@
# Go: compile+link
$(outdir)/.gopath/bin/cmd-nshd: \
$(outdir)/.gopath/bin/cmd-%: FORCE go-generate
	GOPATH=$(abspath $(outdir)/.gopath) go install $(@F)

# C: compile
$(outdir)/%.o: $(srcdir)/%.c $(var)CC $(var)CPPFLAGS $(var)CFLAGS
	$(CC) $(CPPFLAGS) $(CFLAGS) -c -o $@ $(filter-out $(var)%,$^)
# C: link
$(outdir)/bin/nshd-tester $(outdir)/bin/nshd-setuid: \
$(outdir)/%: $(outdir)/%.o $(var)CC $(var)LDFLAGS
	$(CC) $(LDFLAGS) -o $@ $(filter-out $(var)%,$^)

# Basic variable substitution
$(outdir)/%: $(srcdir)/%.in
	< $< sed $(foreach v,$(patsubst $(var)%,%,$(filter $(var)%,$^)), -e 's|@$v@|$($v)|g' ) > $@


# Install

files.sys.all += $(addprefix $(bindir)/,$(programs) $(scripts)) $(systemunitdir)/nshd.socket $(systemunitdir)/nshd.service $(sysusersdir)/nshd.conf $(conf_file) $(shadow_file)

$(DESTDIR)$(bindir)/%: $(outdir)/bin/%
	$(NORMAL_INSTALL)
	install -TDm755 $< $@
$(DESTDIR)$(systemunitdir)/%.socket: $(outdir)/%.socket
	$(NORMAL_INSTALL)
	install -TDm644 $< $@
$(DESTDIR)$(systemunitdir)/%.service: $(outdir)/%.service
	$(NORMAL_INSTALL)
	install -TDm644 $< $@
$(DESTDIR)$(sysusersdir)/%.conf: $(outdir)/%.sysusers
	$(NORMAL_INSTALL)
	install -TDm644 $< $@

# Specific files
$(DESTDIR)$(bindir)/common.rb: $(srcdir)/bin/common.rb
	$(NORMAL_INSTALL)
	install -TDm644 $< $@
$(DESTDIR)$(conf_file): $(srcdir)/parabola-hackers.yml
	$(NORMAL_INSTALL)
	install -TDm644 $< $@
$(DESTDIR)$(shadow_file): $(var)user $(DESTDIR)$(sysusersdir)/nshd.conf
	$(NORMAL_INSTALL)
	install -d $(@D)
	touch $@
	$(POST_INSTALL)
	-systemd-sysusers
	-chown $(user):$(user) $(@D) $@

include $(topsrcdir)/build-aux/Makefile.tail.mk