Avoid crash when loading pickle file failed

The pickle files are used for reusing results from old compose and the
failure should not block the compose process.

JIRA: RHELCMP-9494
Signed-off-by: Haibo Lin <hlin@redhat.com>

pungi/phases/buildinstall.py

@@ -669,9 +669,16 @@ class BuildinstallThread(WorkerThread):
             return None
 
         compose.log_info("Loading old BUILDINSTALL phase metadata: %s", old_metadata)
-        with open(old_metadata, "rb") as f:
-            old_result = pickle.load(f)
-            return old_result
+        try:
+            with open(old_metadata, "rb") as f:
+                old_result = pickle.load(f)
+                return old_result
+        except Exception as e:
+            compose.log_debug(
+                "Failed to load old BUILDINSTALL phase metadata %s : %s"
+                % (old_metadata, str(e))
+            )
+            return None
 
     def _reuse_old_buildinstall_result(self, compose, arch, variant, cmd, pkgset_phase):
         """

pungi/phases/gather/__init__.py

@@ -193,9 +193,16 @@ def load_old_gather_result(compose, arch, variant):
         return None
 
     compose.log_info("Loading old GATHER phase results: %s", old_gather_result)
-    with open(old_gather_result, "rb") as f:
-        old_result = pickle.load(f)
-        return old_result
+    try:
+        with open(old_gather_result, "rb") as f:
+            old_result = pickle.load(f)
+            return old_result
+    except Exception as e:
+        compose.log_debug(
+            "Failed to load old GATHER phase results %s : %s"
+            % (old_gather_result, str(e))
+        )
+        return None
 
 
 def reuse_old_gather_packages(compose, arch, variant, package_sets, methods):

pungi/phases/pkgset/sources/source_koji.py

@@ -819,11 +819,16 @@ def populate_global_pkgset(compose, koji_wrapper, path_prefix, event):
             compose.paths.work.pkgset_file_cache(compose_tag)
         )
         if old_cache_path:
-            pkgset.set_old_file_cache(
-                pungi.phases.pkgset.pkgsets.KojiPackageSet.load_old_file_cache(
-                    old_cache_path
+            try:
+                pkgset.set_old_file_cache(
+                    pungi.phases.pkgset.pkgsets.KojiPackageSet.load_old_file_cache(
+                        old_cache_path
+                    )
+                )
+            except Exception as e:
+                compose.log_debug(
+                    "Failed to load old cache file %s : %s" % (old_cache_path, str(e))
                 )
-            )
 
         is_traditional = compose_tag in compose.conf.get("pkgset_koji_tag", [])
         should_inherit = inherit if is_traditional else inherit_modules