repoclosure: Clean up cache for dnf5

If `dnf repoclosure` actually calls dnf5 (which is not easy to tell),
our cache clean up is ineffective as dnf5 uses different locations to
dnf4. Since it's not easy to tell what `dnf` actually is, let's be safe
and iterate over both possibilities.

Signed-off-by: Lubomír Sedlář <lsedlar@redhat.com>
(cherry picked from commit a31f4233226d1df85d3f197ecc4b7fd47b827593)

pungi/phases/repoclosure.py

@@ -101,15 +101,41 @@ def run_repoclosure(compose):
 
 
 def _delete_repoclosure_cache_dirs(compose):
+    """Find any cached repodata and delete it. The case is not going to be
+    reused ever again, and would otherwise consume storage space.
+
+    DNF will use a different directory depending on whether it is running as
+    root or not. It is not easy to tell though if DNF 4 or 5 is being used, so
+    let's be sure and check both locations. All our cached entries are prefixed
+    by compose ID, so there's very limited amount of risk that we would delete
+    something incorrect.
+    """
+    cache_dirs = []
+
+    try:
+        # DNF 4
         from dnf.const import SYSTEM_CACHEDIR
         from dnf.util import am_i_root
         from dnf.yum.misc import getCacheDir
 
         if am_i_root():
-        top_cache_dir = SYSTEM_CACHEDIR
+            cache_dirs.append(SYSTEM_CACHEDIR)
         else:
-        top_cache_dir = getCacheDir()
+            cache_dirs.append(getCacheDir())
+    except ImportError:
+        pass
 
+    try:
+        # DNF 5 config works directly for root, no need for special case.
+        import libdnf5
+
+        base = libdnf5.base.Base()
+        config = base.get_config()
+        cache_dirs.append(config.cachedir)
+    except ImportError:
+        pass
+
+    for top_cache_dir in cache_dirs:
         for name in os.listdir(top_cache_dir):
             if name.startswith(compose.compose_id):
                 cache_path = os.path.join(top_cache_dir, name)