added distsign target

git-svn-id: https://svn.apache.org/repos/asf/incubator/couchdb/trunk@686384 13f79535-47bb-0310-9956-ffa450edef68

Makefile.am

@@ -36,19 +36,25 @@ README.gz: $(top_srcdir)/README
 THANKS.gz: $(top_srcdir)/THANKS
 	-gzip -9 < $< > $@
 
+.PHONY: local-clean
 local-clean: maintainer-clean
 	@echo "This command is intended for maintainers to use;"
 	@echo "it deletes files that may need special tools to rebuild."
-	rm -f INSTALL
-	rm -f acinclude.m4
-	rm -f aclocal.m4
-	rm -fr build-aux
-	rm -f config.h.in*
-	rm -f configure
-	rm -f configure~
-	rm -f *.tar.gz
-	rm -f *.zip
-	rm -fr m4
-	find . -name Makefile.in | xargs rm
-
-.PHONY: local-clean
+	-rm -f INSTALL
+	-rm -f acinclude.m4
+	-rm -f aclocal.m4
+	-rm -f config.h.in
+	-rm -f configure
+	-rm -f *.tar.gz
+	-rm -f *.tar.gz.asc
+	-rm -f *.tar.gz.md5
+	-rm -f *.tar.gz.sha
+	-rm -fr build-aux
+	-rm -fr m4
+	-find $(top_srcdir) -name Makefile.in | xargs rm
+
+.PHONY: distsign
+distsign: distcheck
+	gpg --armor --detach-sig < $(distdir).tar.gz > $(distdir).tar.gz.asc
+	md5sum $(distdir).tar.gz > $(distdir).tar.gz.md5
+	sha1sum $(distdir).tar.gz > $(distdir).tar.gz.sha