patchtest: add selftest runner

Add a runner that installs the patchtest dependencies in a Python venv
and then starts patchtest's selftests.

Signed-off-by: Trevor Gamblin <tgamblin@baylibre.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

config.json

@@ -1685,6 +1685,13 @@
                 "BBTARGETS" : "core-image-patchtest"
             }
         },
+	"patchtest-selftest" : {
+	    "NEEDREPOS" : ["poky"],
+	    "EXTRACMDS" : ["${SCRIPTSDIR}/run-patchtest-selftest ${HELPERBUILDDIR}/.."],
+	    "ADDLAYER" : [
+	        "${BUILDDIR}/../meta-selftest"
+	    ]
+	},
         "toaster" : {
             "EXTRACMDS" : ["${SCRIPTSDIR}/run-toaster-tests ${HELPERBUILDDIR} ${HELPERBUILDDIR}/.."]
         }

scripts/run-patchtest-selftest

@@ -0,0 +1,18 @@
+#!/bin/bash
+#
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# Called with $1 as the path to poky
+
+set -e
+set -u
+set -o pipefail
+set -x
+
+pokydir=$(realpath "$1")
+
+python3 -m venv venv --without-pip --system-site-packages
+source venv/bin/activate
+python3 -m pip install -r $pokydir/meta/lib/patchtest/requirements.txt
+
+$pokydir/meta/lib/patchtest/selftest/selftest