build-sys: add helper command to sign tarballs

diff --git a/Makefile.am b/Makefile.am
index 407efab45e4c0274878ab95587526186bef14e02..bd313a5d157b572f498790f9c72d4defa244fe34 100644 (file)
--- a/Makefile.am
+++ b/Makefile.am
@@ -6634,6 +6634,9 @@ git-tag:
 git-tar:
        git archive -o systemd-$(VERSION).tar.gz --prefix=systemd-$(VERSION)/ HEAD
 
+%.asc: %
+       gpg2 --detach-sign -a -o $@ $<
+
 www_target = www.freedesktop.org:/srv/www.freedesktop.org/www/software/systemd
 
 .PHONY: doc-sync