$ git clone -n https://src.fedoraproject.org/rpms/perl-DBI-Dumper.git /var/lib/mock/f45-build-22726-593/root/chroot_tmpdir/scmroot/perl-DBI-Dumper
Cloning into '/var/lib/mock/f45-build-22726-593/root/chroot_tmpdir/scmroot/perl-DBI-Dumper'...
$ git fetch origin 4812cd195205b373b17988bef135879ebe15bf6d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-DBI-Dumper
 * [new ref]         4812cd195205b373b17988bef135879ebe15bf6d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4812cd1 Perl 5.44 rebuild