$ git clone -n https://src.fedoraproject.org/rpms/perl-Algorithm-Diff.git /var/lib/mock/f41-build-1280406-23185/root/chroot_tmpdir/scmroot/perl-Algorithm-Diff
Cloning into '/var/lib/mock/f41-build-1280406-23185/root/chroot_tmpdir/scmroot/perl-Algorithm-Diff'...
$ git fetch origin 569462082d288092e4c5b38150180715f92a338a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Algorithm-Diff
 * [new ref]         569462082d288092e4c5b38150180715f92a338a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5694620 Eliminate use of obsolete %patchN syntax (#2283636)