Add pkgset_allow_reuse option

JIRA: RHELCMP-492
Signed-off-by: Haibo Lin <hlin@redhat.com>

doc/configuration.rst

@@ -505,6 +505,10 @@ Options
     with everything. Set this option to ``False`` to ignore ``noarch`` in
     ``ExclusiveArch`` and always consider only binary architectures.
 
+**pkgset_allow_reuse** = True
+    (*bool*) -- When set to ``True``, *Pungi* will try to reuse pkgset data
+    from old compose specified by ``--old-composes``.
+
 
 Example
 -------

pungi/checks.py

@@ -642,6 +642,7 @@ def make_schema():
             },
             "gather_profiler": {"type": "boolean", "default": False},
             "gather_allow_reuse": {"type": "boolean", "default": False},
+            "pkgset_allow_reuse": {"type": "boolean", "default": True},
             "pkgset_source": {"type": "string", "enum": ["koji", "repos"]},
             "createrepo_c": {"type": "boolean", "default": True},
             "createrepo_checksum": {

pungi/phases/pkgset/pkgsets.py

@@ -627,6 +627,10 @@ class KojiPackageSet(PackageSetBase):
         :param include_packages: an iterable of tuples (package name, arch) that should
                                  be included.
         """
+        if not compose.conf["pkgset_allow_reuse"]:
+            self.log_info("Reusing pkgset data from old compose is disabled.")
+            return False
+
         self.log_info("Trying to reuse pkgset data of old compose")
         if not compose.paths.get_old_compose_topdir():
             self.log_debug("No old compose found. Nothing to reuse.")