# Makefile for building the Live ISO sources for OBS, see README.md for more
# details.

# directory with the sources
SRCDIR = ./src

# the target directory
DESTDIR = ./dist

# the default build flavor, see the src/_multibuild file,
# to build a different flavor run "make build FLAVOR=<flavor>"
FLAVOR = openSUSE

# the default OBS project,
# to use a different project run "make build OBS_PROJECT=<project>"
OBS_PROJECT = "systemsmanagement:Agama:Staging"

# files to copy from src/
COPY_FILES = $(patsubst $(SRCDIR)/%,$(DESTDIR)/%,$(wildcard $(SRCDIR)/*))

all: $(DESTDIR) $(COPY_FILES) $(DESTDIR)/config-cdroot.tar.xz $(DESTDIR)/root.tar.xz

# clean the destination directory (but keep the .osc directory if it is present)
clean:
	rm -rf $(DESTDIR)/*

$(DESTDIR):
	mkdir -p $@

# copy the files from src/ to dist/
$(DESTDIR)/%: $(SRCDIR)/%
	@if [ -e "$@" ]; then MSG="updated"; else MSG="created"; fi; \
	cp -f $< $@ ;\
	echo "$@ $${MSG}"

# make a tarball from a directory
# the tarball is reproducible, i.e. the same sources should result in the very
# same tarball (bitwise) for the file time stamps use the date of the last
# commit in the respective directory, use the UTC date to avoid possible time
# zone and DST differences
#
# we need the second expansion here to depend on all files in the source
# directory, the first expansion expands `%` and reduces the escaped $$
# to a single $, the second expansion runs $(shell find ...)
# https://www.gnu.org/software/make/manual/html_node/Secondary-Expansion.html
.SECONDEXPANSION:
$(DESTDIR)/%.tar.xz: % $$(shell find % -type f,l)
	@if [ -e "$@" ]; then MSG="updated"; else MSG="created"; fi; \
	MTIME=$$(date --date="$$(git log -n 1 --pretty=format:%ci $<)" --utc +"%Y-%m-%d %H:%M:%S"); \
	(cd $< && find . -type f,l -not -name README.md | LC_ALL=C sort | tar -c -f - --format=gnu --owner=0 --group=0 --files-from - --mtime="$$MTIME") | xz -c -9 -e > $@; \
	echo "$@ $${MSG}"

# build the ISO locally
build: $(DESTDIR)
	if [ ! -e  $(DESTDIR)/.osc ]; then make clean; osc co -o $(DESTDIR) $(OBS_PROJECT) agama-live; fi
	$(MAKE) all
	(cd $(DESTDIR) && osc build -M $(FLAVOR) images)

.PHONY: build all clean