selftest/containerimage.py: Add container IMAGE_FSTYPES test

This test checks to make sure only the files expected exist in a
container image. Currently only ROOTFS_BOOTSTRAP_INSTALL, gets added to
all images without the user specifying it.

But this test should help if a developer in the future ever silently
adds more than just ROOTFS_BOOTSTRAP_INSTALL, and that the developer can
make sure it also gets removed from a container image.

[YOCTO #9502]

(From OE-Core rev: 4f5e5321fafe491f91d78a35d11afc0dc0527d4b)

Signed-off-by: Randy Witt <randy.e.witt@linux.intel.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta-selftest/recipes-test/container-image/container-image-testpkg.bb

@@ -0,0 +1,8 @@
+LICENSE = "MIT"
+
+INHIBIT_DEFAULT_DEPS = "1"
+
+do_install_append() {
+    install -d ${D}${bindir}
+    touch ${D}${bindir}/theapp
+}

meta-selftest/recipes-test/container-image/container-test-image.bb

@@ -0,0 +1,8 @@
+IMAGE_INSTALL += "container-image-testpkg"
+
+LICENSE = "MIT"
+
+IMAGE_FSTYPES = "container"
+IMAGE_LINGUAS = ""
+
+inherit core-image

meta/lib/oeqa/selftest/containerimage.py

@@ -0,0 +1,83 @@
+import os
+
+from oeqa.selftest.base import oeSelfTest
+from oeqa.utils.commands import bitbake, get_bb_vars, runCmd
+
+# This test builds an image with using the "container" IMAGE_FSTYPE, and
+# ensures that then files in the image are only the ones expected.
+#
+# The only package added to the image is container_image_testpkg, which
+# contains one file. However, due to some other things not cleaning up during
+# rootfs creation, there is some cruft. Ideally bugs will be filed and the
+# cruft removed, but for now we whitelist some known set.
+#
+# Also for performance reasons we're only checking the cruft when using ipk.
+# When using deb, and rpm it is a bit different and we could test all
+# of them, but this test is more to catch if other packages get added by
+# default other than what is in ROOTFS_BOOTSTRAP_INSTALL.
+#
+class ContainerImageTests(oeSelfTest):
+
+    # Verify that when specifying a IMAGE_TYPEDEP_ of the form "foo.bar" that
+    # the conversion type bar gets added as a dep as well
+    def test_expected_files(self):
+
+        def get_each_path_part(path):
+            if path:
+                part = [ '.' + path + '/' ]
+                result = get_each_path_part(path.rsplit('/', 1)[0])
+                if result:
+                    return part + result
+                else:
+                    return part
+            else:
+                return None
+
+        self.write_config("""PREFERRED_PROVIDER_virtual/kernel = "linux-dummy"
+IMAGE_FSTYPES = "container"
+PACKAGE_CLASSES = "package_ipk"
+IMAGE_FEATURES = ""
+""")
+
+        bbvars = get_bb_vars(['bindir', 'sysconfdir', 'localstatedir',
+                              'DEPLOY_DIR_IMAGE', 'IMAGE_LINK_NAME'],
+                              target='container-test-image')
+        expected_files = [
+                    './',
+                    '.{bindir}/theapp',
+                    '.{sysconfdir}/default/',
+                    '.{sysconfdir}/default/postinst',
+                    '.{sysconfdir}/ld.so.cache',
+                    '.{sysconfdir}/timestamp',
+                    '.{sysconfdir}/version',
+                    './run/',
+                    '.{localstatedir}/cache/',
+                    '.{localstatedir}/cache/ldconfig/',
+                    '.{localstatedir}/cache/ldconfig/aux-cache',
+                    '.{localstatedir}/cache/opkg/',
+                    '.{localstatedir}/lib/',
+                    '.{localstatedir}/lib/opkg/'
+                ]
+
+        expected_files = [ x.format(bindir=bbvars['bindir'],
+                                    sysconfdir=bbvars['sysconfdir'],
+                                    localstatedir=bbvars['localstatedir'])
+                                    for x in expected_files ]
+
+        # Since tar lists all directories individually, make sure each element
+        # from bindir, sysconfdir, etc is added
+        expected_files += get_each_path_part(bbvars['bindir'])
+        expected_files += get_each_path_part(bbvars['sysconfdir'])
+        expected_files += get_each_path_part(bbvars['localstatedir'])
+
+        expected_files = sorted(expected_files)
+
+        # Build the image of course
+        bitbake('container-test-image')
+
+        image = os.path.join(bbvars['DEPLOY_DIR_IMAGE'],
+                             bbvars['IMAGE_LINK_NAME'] + '.tar.bz2')
+
+        # Ensure the files in the image are what we expect
+        result = runCmd("tar tf {} | sort".format(image), shell=True)
+        self.assertEqual(result.output.split('\n'), expected_files)