rpm: crafting an rpmspec for this tool

Now you can `make srpm` or `make rpm`.

Additionally, trying to make a way for copr to build this as well. We'll
see if that is something.

Makefile

@@ -1,14 +1,29 @@
-SRC := ./BuildSourceImage.sh
-CTR_IMAGE := localhost/containers/buildsourceimage
-CTR_ENGINE ?= podman
-BATS_OPTS ?=
-cleanfiles =
+pkgname		:= BuildSourceImage
+CTR_IMAGE	:= localhost/containers/buildsourceimage
+CTR_ENGINE	?= podman
+BATS_OPTS	?=
+cleanfiles	=
 # these are packages whose src.rpms are very small
-srpm_urls = \
+srpm_urls	= \
 	https://archive.kernel.org/centos-vault/7.0.1406/os/Source/SPackages/basesystem-10.0-7.el7.centos.src.rpm \
 	https://archive.kernel.org/centos-vault/7.0.1406/os/Source/SPackages/rootfiles-8.1-11.el7.src.rpm \
 	https://archive.kernel.org/centos-vault/7.0.1406/os/Source/SPackages/centos-bookmarks-7-1.el7.src.rpm
-srpms = $(addprefix ./.testprep/srpms/,$(notdir $(rpms)))
+srpms		= $(addprefix ./.testprep/srpms/,$(notdir $(rpms)))
+
+spec		?= $(pkgname).spec
+pwd		:= $(shell pwd)
+NAME		:= $(shell rpmspec -q --qf "%{name}" $(spec))
+VERSION		:= $(shell rpmspec -q --qf "%{version}" $(spec))
+RELEASE		:= $(shell rpmspec -q --qf "%{release}" $(spec))
+ARCH		:= $(shell rpmspec -q --qf "%{arch}" $(spec))
+NVR		:= $(NAME)-$(VERSION)-$(RELEASE)
+outdir		?= $(pwd)
+
+SHELL_SRC		:= ./BuildSourceImage.sh
+DIST_FILES		:= \
+	$(SHELL_SRC) \
+	LICENSE \
+	README.md
 
 export CTR_IMAGE
 export CTR_ENGINE
@@ -18,13 +33,13 @@ all: validate
 validate: .validate
 
 cleanfiles += .validate
-.validate: $(SRC)
-	shellcheck $(SRC) && touch $@
+.validate: $(SHELL_SRC)
+	shellcheck $(SHELL_SRC) && touch $@
 
 build-container: .build-container
 
 cleanfiles += .build-container
-.build-container: .validate Dockerfile $(SRC)
+.build-container: .validate Dockerfile $(SHELL_SRC)
 	@echo
 	@echo "==> Building BuildSourceImage Container"
 	$(CTR_ENGINE) build --quiet --file Dockerfile --tag $(CTR_IMAGE) . && touch $@
@@ -41,6 +56,34 @@ test-integration: .build-container .testprep
 	@echo "==> Running integration tests"
 	TMPDIR=$(realpath .testprep/tmp) bats $(BATS_OPTS) test/
 
+.PHONY: srpm
+srpm: $(NVR).src.rpm
+	@echo $^
+
+cleanfiles += $(NVR).src.rpm
+$(NVR).src.rpm: $(spec) $(DIST_FILES)
+	rpmbuild \
+                --define '_sourcedir $(pwd)' \
+                --define '_specdir $(pwd)' \
+                --define '_builddir $(pwd)' \
+                --define '_srcrpmdir $(outdir)' \
+                --define '_rpmdir $(outdir)' \
+                --nodeps \
+                -bs ./$(spec)
+
+.PHONY: rpm
+rpm: $(ARCH)/$(NVR).$(ARCH).rpm
+	@echo $^
+
+cleanfiles += $(ARCH)/$(NVR).$(ARCH).rpm
+$(ARCH)/$(NVR).$(ARCH).rpm: $(spec) $(DIST_FILES)
+	rpmbuild \
+                --define '_sourcedir $(pwd)' \
+                --define '_specdir $(pwd)' \
+                --define '_builddir $(pwd)' \
+                --define '_srcrpmdir $(outdir)' \
+                --define '_rpmdir $(outdir)' \
+                -bb ./$(spec)
 
 clean:
 	if [ -n "$(cleanfiles)" ] ; then rm -rf $(cleanfiles) ; fi