diff --git a/atomic_reactor/config.py b/atomic_reactor/config.py
index dd2df3a15..547444304 100644
--- a/atomic_reactor/config.py
+++ b/atomic_reactor/config.py
@@ -483,7 +483,7 @@ def hide_files(self):
     @property
     def skip_koji_check_for_base_image(self):
         return self._get_value(ReactorConfigKeys.SKIP_KOJI_CHECK_FOR_BASE_IMAGE_KEY,
-                               fallback=False)
+                               fallback=True)
 
     @property
     def deep_manifest_list_inspection(self):
diff --git a/atomic_reactor/plugins/check_base_image.py b/atomic_reactor/plugins/check_base_image.py
index 5923a7644..b02f07cc0 100644
--- a/atomic_reactor/plugins/check_base_image.py
+++ b/atomic_reactor/plugins/check_base_image.py
@@ -143,6 +143,11 @@ def _get_manifest_list(self, image: ImageName) -> requests.Response:
         reg_client = self._get_registry_client(image.registry)
 
         manifest_list = reg_client.get_manifest_list(image)
+
+        if not manifest_list:
+            self.log.info('manifest list not found trying to get image index')
+            manifest_list = reg_client.get_manifest_index(image)
+
         if '@sha256:' in str(image) and not manifest_list:
             # we want to adjust the tag only for manifest list fetching
             image = image.copy()
diff --git a/atomic_reactor/plugins/fetch_sources.py b/atomic_reactor/plugins/fetch_sources.py
index b7aea8deb..45f8da1ee 100644
--- a/atomic_reactor/plugins/fetch_sources.py
+++ b/atomic_reactor/plugins/fetch_sources.py
@@ -683,9 +683,10 @@ def get_srpm_urls(self, sigkeys=None, insecure=False):
             self.log.debug('Resolving SRPM for RPM ID: %s', rpm_id)
 
             if rpm['external_repo_name'] != 'INTERNAL':
-                msg = ('RPM comes from an external repo (RPM ID: {}). '
-                       'External RPMs are currently not supported.').format(rpm_id)
-                raise RuntimeError(msg)
+                msg = ('RPM comes from an external repo (RPM ID: {}; NVR: {}). '
+                       'External RPMs are currently not supported, skipping').format(rpm_id, rpm['nvr'])
+                self.log.warning(msg)
+                continue
 
             rpm_hdr = self.session.getRPMHeaders(rpm_id, headers=['SOURCERPM'])
             if 'SOURCERPM' not in rpm_hdr:
diff --git a/atomic_reactor/plugins/koji_parent.py b/atomic_reactor/plugins/koji_parent.py
index f5df1b64f..765bf093a 100644
--- a/atomic_reactor/plugins/koji_parent.py
+++ b/atomic_reactor/plugins/koji_parent.py
@@ -23,7 +23,7 @@
 import time
 
 
-DEFAULT_POLL_TIMEOUT = 60 * 10  # 10 minutes
+DEFAULT_POLL_TIMEOUT = 60 * 3  # 3 minutes
 DEFAULT_POLL_INTERVAL = 10  # 10 seconds
 
 
@@ -295,7 +295,8 @@ def wait_for_parent_image_build(self, nvr: str) -> Dict[str, Any]:
                     exc_msg = ('Parent image Koji build {} state is {}, not COMPLETE.')
                     raise KojiParentBuildMissing(exc_msg.format(nvr, build_state))
             time.sleep(self.poll_interval)
-        raise KojiParentBuildMissing('Parent image Koji build NOT found for {}!'.format(nvr))
+        self.log.warning(f"Parent image Koji build NOT found for %s!", nvr)
+        return None
 
     def make_result(self) -> Optional[Dict[str, Any]]:
         """Construct the result dict to be preserved in the build metadata."""
diff --git a/atomic_reactor/plugins/resolve_composes.py b/atomic_reactor/plugins/resolve_composes.py
index d2654aa0e..a71205359 100644
--- a/atomic_reactor/plugins/resolve_composes.py
+++ b/atomic_reactor/plugins/resolve_composes.py
@@ -148,7 +148,10 @@ def adjust_for_inherit(self):
         if not self.plugin_result:
             return
 
-        build_info = self.plugin_result[BASE_IMAGE_KOJI_BUILD]
+        build_info = self.plugin_result.get(BASE_IMAGE_KOJI_BUILD)
+        if not build_info:
+            self.log.warning('Parent koji build does not exist can not inherit from the parent')
+            return
         parent_repourls = []
 
         try:
@@ -218,7 +221,11 @@ def adjust_signing_intent_from_parent(self):
                            PLUGIN_KOJI_PARENT_KEY)
             return
 
-        build_info = self.plugin_result[BASE_IMAGE_KOJI_BUILD]
+        build_info = self.plugin_result.get(BASE_IMAGE_KOJI_BUILD)
+        if not build_info:
+            self.log.warning('Parent koji build does not exist can not adjust '
+                             'signing intent from the parent')
+            return
 
         try:
             parent_signing_intent_name = build_info['extra']['image']['odcs']['signing_intent']
diff --git a/atomic_reactor/util.py b/atomic_reactor/util.py
index fa21e635d..12a7e8eaf 100644
--- a/atomic_reactor/util.py
+++ b/atomic_reactor/util.py
@@ -762,6 +762,17 @@ def get_manifest_list(self, image: ImageName) -> Optional[requests.Response]:
         response, _ = self.get_manifest(image, version)
         return response
 
+    def get_manifest_index(self, image: ImageName) -> Optional[requests.Response]:
+        """Return manifest index for image.
+
+        :param image: ImageName, the remote image to inspect
+
+        :return: response, or None, with manifest list
+        """
+        version = 'oci_index'
+        response, _ = self.get_manifest(image, version)
+        return response
+
     def get_manifest_list_digest(self, image):
         """Return manifest list digest for image
 
@@ -775,7 +786,7 @@ def get_manifest_list_digest(self, image):
         return 'sha256:{}'.format(digest_dict['sha256sum'])
 
     def get_all_manifests(
-        self, image: ImageName, versions: Sequence[str] = ('v1', 'v2', 'v2_list')
+        self, image: ImageName, versions: Sequence[str] = ('v1', 'v2', 'v2_list', 'oci_index')
     ) -> Dict[str, requests.Response]:
         """Return manifest digests for image.
 
@@ -815,6 +826,11 @@ def get_inspect_for_image(
             blob_config, config_digest = self._config_and_id_from_manifest_list(
                 image, manifest_list, arch
             )
+        elif 'oci_index' in all_man_digests:
+            manifest_list = all_man_digests['oci_index'].json()
+            blob_config, config_digest = self._config_and_id_from_manifest_list(
+                image, manifest_list, arch
+            )
         # get config for v2 digest
         elif 'v2' in all_man_digests:
             v2_json = all_man_digests['v2'].json()
@@ -889,11 +905,15 @@ def _config_and_id_from_manifest_list(
                 )
             manifest = arch_manifests[0]
 
-        if manifest["mediaType"] != MEDIA_TYPE_DOCKER_V2_SCHEMA2:
-            raise RuntimeError(f"Image {image}: v2 schema 1 in manifest list")
+        if manifest["mediaType"] != MEDIA_TYPE_DOCKER_V2_SCHEMA2 and manifest["mediaType"] != MEDIA_TYPE_OCI_V1:
+            raise RuntimeError(f"Image {image}: v2 schema 1 in manifest list, oci in image index is missing")
 
-        v2_digest = manifest["digest"]
-        return self.get_config_and_id_from_registry(image, v2_digest, version='v2')
+        image_digest = manifest["digest"]
+
+        if manifest["mediaType"] != MEDIA_TYPE_DOCKER_V2_SCHEMA2:
+            return self.get_config_and_id_from_registry(image, image_digest, version='v2')
+        else:
+            return self.get_config_and_id_from_registry(image, image_digest, version='oci')
 
     def get_config_and_id_from_registry(self, image, digest: str, version='v2') -> Tuple[Dict, str]:
         """Return image config by digest
@@ -1115,7 +1135,7 @@ def get_manifest_list(image, registry, insecure=False, dockercfg_path=None):
 
 
 def get_all_manifests(image, registry, insecure=False, dockercfg_path=None,
-                      versions=('v1', 'v2', 'v2_list')):
+                      versions=('v1', 'v2', 'v2_list', 'oci_index')):
     """Return manifest digests for image.
 
     :param image: ImageName, the remote image to inspect