selftest/classes: add localpkgfeed class

This class can be used to construct a subset of a deployed package feed
for use in tests which iterate the deploy directory, and as such a huge
feed of 30K+ packages can result in very slow tests.

(From OE-Core rev: c5486d6ad32457f09c104d5dd31314bd570912d3)

Signed-off-by: Ross Burton <ross.burton@arm.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta-selftest/classes/localpkgfeed.bbclass

@@ -0,0 +1,27 @@
+# Create a subset of the package feed that just contain the
+# packages depended on by this recipe.
+
+LOCALPKGFEED_DIR = "${WORKDIR}/localpkgfeed"
+
+addtask localpkgfeed after do_build
+do_localpkgfeed[cleandirs] = "${LOCALPKGFEED_DIR}"
+do_localpkgfeed[nostamp] = "1"
+
+def get_packaging_class(d):
+    package_class = d.getVar("PACKAGE_CLASSES").split()[0]
+    return package_class.replace("package_", "")
+
+python () {
+    packaging = get_packaging_class(d)
+    d.setVarFlag("do_localpkgfeed", "rdeptask", "do_package_write_" + packaging)
+}
+
+python do_localpkgfeed() {
+    import oe.package_manager
+
+    packaging = get_packaging_class(d)
+    deploydir = d.getVar("DEPLOY_DIR_" + packaging.upper())
+    task = "package_write_" + packaging
+
+    oe.package_manager.create_packages_dir(d, d.getVar("LOCALPKGFEED_DIR"), deploydir, task, True, True)
+}