$ git clone -n https://src.fedoraproject.org/rpms/perl-Devel-Refcount.git /var/lib/mock/f45-build-23190-596/root/chroot_tmpdir/scmroot/perl-Devel-Refcount
Cloning into '/var/lib/mock/f45-build-23190-596/root/chroot_tmpdir/scmroot/perl-Devel-Refcount'...
$ git fetch origin 0d278f8038406e40cf8a3bfe5f2fafc4cfdbcae6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Devel-Refcount
 * [new ref]         0d278f8038406e40cf8a3bfe5f2fafc4cfdbcae6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0d278f8 Perl 5.44 rebuild