abuild: check that source package is not a version number only

github tarballs are normally only a version number. we need to force
that those are renamed so we dont get source tarball name collisions.

abuild.in

@@ -179,6 +179,16 @@ default_sanitycheck() {
 			esac
 			list_has ${i##*/} $md5sums $sha256sums $sha512sums \
 				|| die "${i##*/} is missing in checksums"
+
+			# verify that our source does not have git tag version
+			# name as tarball (typicallly github)
+			if is_remote "$i" && [ "${i#*::}" = "$i" ]; then
+				case ${i##*/} in
+				v$pkgver.tar.*|$pkgver.tar.*)
+					die "source ${i##*/} needs to be renamed to avoid possible collisions"
+					;;
+				esac
+			fi
 		done
 	fi