$ git clone -n https://src.fedoraproject.org/rpms/perl-Devel-CallChecker.git /var/lib/mock/f41-build-1639667-24158/root/chroot_tmpdir/scmroot/perl-Devel-CallChecker
Cloning into '/var/lib/mock/f41-build-1639667-24158/root/chroot_tmpdir/scmroot/perl-Devel-CallChecker'...
$ git fetch origin 2214739a2c574b4e8baade4864369dda0bdcd40c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Devel-CallChecker
 * [new ref]         2214739a2c574b4e8baade4864369dda0bdcd40c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2214739 Perl 5.40 rebuild