From 53510f54cf0c625234edd90502a4a3b7b9bfd7c7 Mon Sep 17 00:00:00 2001
From: Pavel Raiskup <praiskup@redhat.com>
Date: Jun 05 2023 13:06:14 +0000
Subject: Use temporary DNF cache directory


By default, in Koji build system, dnf.conf says
`cachedir=/var/cache/yum`.  At %check time, we run in mock under the
mockbuilder user and we have no rights to write into /var/cache/yum.

This fixes Mock build in Koji, though it eventually relates to:
https://github.com/fedora-copr/copr/issues/2756

---

diff --git a/prunerepo/helpers.py b/prunerepo/helpers.py
index 561c56a..53e4f82 100644
--- a/prunerepo/helpers.py
+++ b/prunerepo/helpers.py
@@ -12,6 +12,7 @@ import re
 import time
 import shutil
 import logging
+import tempfile
 
 from prunerepo.pair_srpm_rpm import RPMToSRPMPairs
 
@@ -176,6 +177,12 @@ def get_rpms_to_remove(directory, days=0, log=None):
     :raises PrunerepoException: Upon any failure that could provide bad results
         causing unwanted RPM removals.
     """
+
+    with tempfile.TemporaryDirectory(prefix="prunerepo-dnf-cache") as cachedir:
+        return _get_rpms_to_remove_internal(directory, days, log, cachedir)
+
+
+def _get_rpms_to_remove_internal(directory, days, log, cachedir):
     get_all_packages_cmd = [
         "dnf-3",
         "repoquery",
@@ -185,6 +192,7 @@ def get_rpms_to_remove(directory, days=0, log=None):
         "--location",
         "--quiet",
         "--setopt=skip_if_unavailable=False",
+        f"--setopt=cachedir={cachedir}",
     ]
 
     if not log: