ohos-sanity.bbclass: Add OpenHarmony sanity checks bbclass

This bbclass is meant to handle various build configuration checks. As
per the current implementation, it handles collections deprecation.

Deprecated collections can be either completely removed or replaced by
another layer. The format of OHOS_DEPRECATED_COLLECTIONS is a list of
<DEPRECATED_COLLECTION>:<REPLACEMENT_COLLECTION>. When
<REPLACEMENT_COLLECTION> is not provided, the layer was removed without
a replacement.

Signed-off-by: Andrei Gherzan <andrei.gherzan@huawei.com>

meta-ohos-core/classes/ohos-sanity.bbclass

+# SPDX-FileCopyrightText: Huawei Inc.
+#
+# SPDX-License-Identifier: Apache-2.0
+
+# Deprecated collections can be either completely removed or replaced by
+# another layer. The format of OHOS_DEPRECATED_COLLECTIONS is a list of
+# <DEPRECATED_COLLECTION>:<REPLACEMENT_COLLECTION>. When
+# <REPLACEMENT_COLLECTION> is not provided, the layer was removed without a
+# replacement.
+OHOS_DEPRECATED_COLLECTIONS = " \
+    "
+
+def unpack_deprecation(elem) -> 'Tuple[str, str]':
+    elem_split = elem.split(sep=':', maxsplit=1)
+    return (elem_split[0], elem_split[1] if len(elem_split) == 2 else '')
+
+def ohos_is_valid_config() -> bool:
+    """Handles OpenHarmony build configuration sanity checks."""
+
+    # By default assume no fatal errors
+    success = True
+
+    #
+    # Layers deprecation
+    #
+    for deprecation in d.getVar('OHOS_DEPRECATED_COLLECTIONS').split():
+        (deprecated, new) = unpack_deprecation(deprecation)
+        if deprecated in d.getVar('BBFILE_COLLECTIONS').split():
+            if new:
+                if new in d.getVar('BBFILE_COLLECTIONS').split():
+                    bb.warn("bblayers.conf contains both deprecated ({0}) "
+                             "and replaced ({1}) layers. Remove the "
+                             "deprecated layer." \
+                             .format(deprecated, new))
+                    # Having both deprecated and replacement layers is
+                    # unwanted.
+                    success = False
+                msg = "{0} is a deprecated layer. Adapt your bblayers.conf " \
+                      "to use the {1} replacement.".format(deprecated, new)
+            else:
+                msg = "{0} is a deprecated layer. Adapt your bblayers.conf " \
+                      "accordingly.".format(deprecated)
+            bb.warn(msg)
+    
+    return success
+
+python ohos_sanity_handler() {
+    if d.getVar('OHOS_SANITY_SKIP', True) == "1":
+        bb.warn('OpenHarmony-specific sanity checks were skipped.')
+        return
+    if not ohos_is_valid_config():
+        bb.fatal("OpenHarmony sanity checks included fatal errors. See above.")
+}
+
+addhandler ohos_sanity_handler
+ohos_sanity_handler[eventmask] = "bb.event.BuildStarted"