$ git clone -n https://src.fedoraproject.org/rpms/perl-Data-Dumper.git /var/lib/mock/eln-build-side-114847-60995322-6587417/root/chroot_tmpdir/scmroot/perl-Data-Dumper
Cloning into '/var/lib/mock/eln-build-side-114847-60995322-6587417/root/chroot_tmpdir/scmroot/perl-Data-Dumper'...
$ git fetch origin 9a7b23ee0c3ae31cf11d08312fb77cc025ca4038:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Data-Dumper
 * [new ref]         9a7b23ee0c3ae31cf11d08312fb77cc025ca4038 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9a7b23e Perl 5.42 re-rebuild of bootstrapped packages