common/ttcn3-docker-run.sh: add TEST_NAME env var

Make it possible to run only one test by setting an environment
variable.

Change-Id: I1f45a05e089b429918096fcd64f7c02033d5a9dd

README.md

@@ -26,6 +26,16 @@ Environment variables:
   Osmocom project. Defaults to `master`.
 * `NO_DOCKER_IMAGE_BUILD`: when set to `1`, it won't try to update the
   containers (see "caching" below)
+* `DOCKER_ARGS`: pass extra arguments to docker, e.g. to mount local sources
+  for building as done in osmo-dev.git/ttcn3/ttcn3.sh
+
+### Run only one test
+
+```
+$ cd ttcn3-hlr-test
+$ export DOCKER_ARGS="-e TEST_NAME=TC_gsup_sai"
+$ ./jenkins.sh
+```
 
 ### Using nightly packages from a different date
 

common/ttcn3-docker-run.sh

@@ -33,7 +33,21 @@ fi
 
 cd /data
 
-/osmo-ttcn3-hacks/start-testsuite.sh "/osmo-ttcn3-hacks/$SUBDIR/$SUITE"
+# Use TEST_NAME to only run one test instead of all. Set it like this:
+# $ cd ttcn3-hlr-test
+# $ export DOCKER_ARGS="-e TEST_NAME=TC_gsup_sai"
+# $ ./jenkins.sh
+
+EXTRA_ARGS=""
+if [ -n "$TEST_NAME" ]; then
+	EXTRA_ARGS="$SUITE.$TEST_NAME"
+fi
+
+/osmo-ttcn3-hacks/start-testsuite.sh \
+	"/osmo-ttcn3-hacks/$SUBDIR/$SUITE" \
+	"$SUITE.cfg" \
+	$EXTRA_ARGS
+
 exit_code=$?
 
 /osmo-ttcn3-hacks/log_merge.sh "$SUITE" --rm