update packaging code

CONTRIBUTING.md

@@ -2,28 +2,26 @@
 
 ## Packaging
 
-An unsigned Debian package can be created from the repository in a few steps.
+## Source release
+
+A source tarball can be created from the `Makefile`:
+
+```bash
+git checkout v1.0
+make source-release
+```
+
+This is suitable as a "pristine" source for downstream packagers.
+
+## Debian unsigned package
+
+An unsigned Debian package can also be created from the repository in a few steps.
 
 Check out the version you want:
 
 ```bash
-VERSION=1.0
-git checkout v$VERSION
-```
-
-Write a 'pristine source' tarball from `git`:
-
-```bash
-git archive --format tar.gz HEAD --prefix mdcheckr-$VERSION/ mdcheckr tests README.md LICENSE.md > mdcheckr_$VERSION.orig.tar.gz
-```
-
-Extract, add the Debian goodies, compile, and cleanup:
-
-```bash
-tar -xzf mdcheckr_$VERSION.orig.tar.gz
-cp -Rf debian/ mdcheckr-$VERSION/
-(cd mdcheckr-$VERSION/ && debuild -us -uc)
-rm -Rf mdcheckr-$VERSION/
+git checkout v1.0
+make unsigned-package
 ```
 
 You will then have source and binary packages in the current directory.

Makefile

@@ -0,0 +1,29 @@
+VERSION=1.0
+
+.PHONY: default test offline-test source-tarball unsigned-package
+
+default: test
+
+test:
+	(cd tests && ./test.sh)
+
+source-tarball: mdcheckr_$(VERSION).orig.tar.gz
+
+mdcheckr_$(VERSION).orig.tar.gz:
+	tar --transform "s/^/mdcheckr-$(VERSION)\//" -cvzf \
+		mdcheckr_$(VERSION).orig.tar.gz \
+		LICENSE.md \
+		README.md \
+		mdcheckr \
+		tests
+
+unsigned-package: mdcheckr_$(VERSION)-1_all.deb
+
+mdcheckr_$(VERSION)-1_all.deb: mdcheckr_$(VERSION).orig.tar.gz
+	tar -xzf mdcheckr_$(VERSION).orig.tar.gz
+	cp -Rf debian/ mdcheckr-$(VERSION)/
+	(cd mdcheckr-$(VERSION)/ && debuild -us -uc)
+	rm -Rf mdcheckr-$(VERSION)/
+
+clean:
+	rm -Rf mdcheckr-$(VERSION)* mdcheckr_$(VERSION)*