Add support for testing of local SDC images

By default it is disabled and the test works as before, but by providing
the SDC_LOCAL_IMAGES variable with a value of true/yes it will not use
the upstream images (from registry) but instead the local one (in docker
cache) - they have to be build beforehand of course.

They are two more optional variables (if SDC_LOCAL_IMAGES == true/yes):
SDC_LOCAL_GITREPO .. for local git repo instead of an upstream branch
SDC_LOCAL_TAG     .. it will use local images with this docker tag

Issue-ID: SDC-2553

Signed-off-by: Petr Ospalý <p.ospaly@partner.samsung.com>
Change-Id: Ib64ca17e81aa9c3406e0a5d8fb403f1c1b0862a1
diff --git a/plans/sdc/sanity/setup.sh b/plans/sdc/sanity/setup.sh
index 0e652f8..20a8eac 100644
--- a/plans/sdc/sanity/setup.sh
+++ b/plans/sdc/sanity/setup.sh
@@ -15,4 +15,26 @@
 # limitations under the License.
 #
 
+# By default all images are from remote upstream registry, this option
+# provides the chance to test locally built images
+export SDC_LOCAL_IMAGES="${SDC_LOCAL_IMAGES:-false}"
+
+# For this to take effect SDC_LOCAL_IMAGES must be enabled...
+#
+# The path to the local sdc git repo from which the local images have
+# been built - it also affects the tag used - if left empty *AND*
+# local images are used *AND* SDC_LOCAL_TAG is unset then the tag
+# will be set to: 'latest'
+#
+# BEWARE: Using local images with an incorrect git repo could lead to
+# problems...set SDC_LOCAL_GITREPO or GERRIT_BRANCH properly...
+export SDC_LOCAL_GITREPO="${SDC_LOCAL_GITREPO}"
+
+# For this to take effect SDC_LOCAL_IMAGES must be enabled...
+#
+# This will set the tag for local images - leaving this empty *AND*
+# with unset SDC_LOCAL_GITREPO the local images will fallback to the
+# tag: 'latest'
+export SDC_LOCAL_TAG="${SDC_LOCAL_TAG}"
+
 source ${WORKSPACE}/scripts/sdc/setup_sdc_for_sanity.sh tad