filter-repo: relax the definition of freshly packed

transfer.unpackLimit defaults to 100, meaning that if less than 100
objects exist in the repository, git will automatically unpack the
objects to be loose as part of the clone operation.  So, if there are no
packs and less than 100 objects, consider the repo to be freshly packed
for purposes of our fresh clone sanity checks.

Signed-off-by: Elijah Newren <[email protected]>

Author: newren

git-filter-repo

@@ -2846,11 +2846,17 @@ class RepoFilter(object):
           "  (%s)\n"
           "To override, use --force.") % reason)
 
-    # Make sure repo is fully packed, just like a fresh clone would be
+    # Make sure repo is fully packed, just like a fresh clone would be.
+    # Note that transfer.unpackLimit defaults to 100, meaning that a
+    # repository with no packs and less than 100 objects should be considered
+    # fully packed.
     output = subproc.check_output('git count-objects -v'.split())
     stats = dict(x.split(b': ') for x in output.splitlines())
     num_packs = int(stats[b'packs'])
-    if stats[b'count'] != b'0' or num_packs > 1:
+    num_loose_objects = int(stats[b'count'])
+    if num_packs > 1 or \
+       (num_packs == 1 and num_loose_objects > 0) or \
+       num_loose_objects >= 100:
       abort(_("expected freshly packed repo"))
 
     # Make sure there is precisely one remote, named "origin"...or that this