add strict to getChangelogEntries

If srpm doesn't exist and strict is specified, raise GenericError
instead of returning empty list.

Fixes: https://pagure.io/koji/issue/1147

hub/kojihub.py

@@ -10474,7 +10474,8 @@ class RootExports(object):
 
     addArchiveType = staticmethod(add_archive_type)
 
-    def getChangelogEntries(self, buildID=None, taskID=None, filepath=None, author=None, before=None, after=None, queryOpts=None):
+    def getChangelogEntries(self, buildID=None, taskID=None, filepath=None, author=None,
+                            before=None, after=None, queryOpts=None, strict=False):
         """Get changelog entries for the build with the given ID,
            or for the rpm generated by the given task at the given path
 
@@ -10486,6 +10487,7 @@ class RootExports(object):
                  (a datetime object, a string in the 'YYYY-MM-DD HH24:MI:SS format, or integer seconds
                   since the epoch)
         - queryOpts: query options used by the QueryProcessor
+        - strict: if srpm doesn't exist raise an error, otherwise return empty list
 
         If "order" is not specified in queryOpts, results will be returned in reverse chronological
         order.
@@ -10502,9 +10504,13 @@ class RootExports(object):
         if buildID:
             build_info = get_build(buildID)
             if not build_info:
+                if strict:
+                    raise koji.GenericError("Build %s doesn't exist" % buildID)
                 return _applyQueryOpts([], queryOpts)
             srpms = self.listRPMs(buildID=build_info['id'], arches='src')
             if not srpms:
+                if strict:
+                    raise koji.GenericError("Build %s doesn't have srpms" % buildID)
                 return _applyQueryOpts([], queryOpts)
             srpm_info = srpms[0]
             srpm_path = joinpath(koji.pathinfo.build(build_info), koji.pathinfo.rpm(srpm_info))
@@ -10520,7 +10526,10 @@ class RootExports(object):
             raise koji.GenericError('either buildID or taskID and filepath must be specified')
 
         if not os.path.exists(srpm_path):
-            return _applyQueryOpts([], queryOpts)
+            if strict:
+                raise koji.GenericError("SRPM %s doesn't exist" % srpm_path)
+            else:
+                return _applyQueryOpts([], queryOpts)
 
         if before:
             if isinstance(before, datetime.datetime):