Radix cross Linux 3pp sources

#
# Project Home:
# ============
# https://wireless.wiki.kernel.org/en/developers/Regulatory/CRDA
#
# Git:
# ===
# https://git.kernel.org/pub/scm/linux/kernel/git/mcgrof/crda.git
#

url         = https://git.kernel.org/pub/scm/linux/kernel/git/mcgrof/crda.git

repo_name   = crda

versions    = 3.18 4.14 4.15

pkgname     = crda
suffix      = tar.xz

git_repo    = .git_clone
tarballs    = $(addsuffix .$(suffix), $(addprefix $(pkgname)-, $(versions)))
sha1s       = $(addsuffix .sha1sum, $(tarballs))

TARGETS = repository_clean


all: $(TARGETS)

.PHONY: downloads_clean repository_clean

$(git_repo):
	@echo -e "\n======= Clone $(repo_name).git repository =======\n"
	@rm -rf $(repo_name)
	@git clone $(url) $(repo_name)
	@touch $@

$(tarballs): $(git_repo)
	@for version in $(versions) ; do \
	  tag=`echo v$$version` ; \
	  if [ ! -f $(repo_name)-$$version.$(suffix) ]; then \
	    echo -e "\n======= Creating '$(repo_name)-$$version.$(suffix)' snapshot =======" ; \
	    ( cd $(repo_name) && \
	      git archive --format=tar --prefix=$(repo_name)-$$version/ $$tag | \
	      xz >../$(repo_name)-$$version.$(suffix) ) ; \
	  fi ; \
	done

$(sha1s): %.$(suffix).sha1sum : %.$(suffix)
	@for tarball in $< ; do \
	  echo -e "\n======= Calculation the '$$tarball' sha1sum =======" ; \
	  sha1sum --binary $$tarball > $$tarball.sha1sum ; \
	done

repository_clean: $(sha1s)
	@echo -e "\n======= Remove cloned $(repo_name).git repository =======\n"
	@rm -rf $(git_repo) $(repo_name)

downloads_clean:
	@rm -rf $(tarballs) $(sha1s)
	@rm -rf $(git_repo) $(repo_name)