mkarchive.sh: Default to current version

Add a conditionally defined target to version.mk that just prints the target,
and use that from mkarchive.sh to default to the current version if none is
supplied on the command line.

Signed-off-by: Toke Høiland-Jørgensen <[email protected]>

Author: tohojo

mkarchive.sh

@@ -1,7 +1,7 @@
 #!/bin/bash
 
-VERSION="$1"
 WORKDIR=$(dirname "${BASH_SOURCE[0]}")
+VERSION="${1:-$(make -f $WORKDIR/version.mk)}"
 OUTFILE="$WORKDIR/xdp-tools-$VERSION.tar.gz"
 PREFIX=xdp-tools-$VERSION
 TMPDIR=$(mktemp -d)

version.mk

@@ -1,2 +1,8 @@
 TOOLS_VERSION := "1.4.1"
 
+# Conditionally defined make target makes it possible to print the version
+# defined above by running 'make -f version.mk'
+ifeq ($(MAKEFILE_LIST),version.mk)
+print_version:
+	@echo $(TOOLS_VERSION)
+endif