$ git clone -n https://src.fedoraproject.org/rpms/perl-Devel-GoFaster.git /var/lib/mock/f45-build-23102-595/root/chroot_tmpdir/scmroot/perl-Devel-GoFaster
Cloning into '/var/lib/mock/f45-build-23102-595/root/chroot_tmpdir/scmroot/perl-Devel-GoFaster'...
$ git fetch origin bef145dd141a22e3810403cd54cd48635eb2c491:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Devel-GoFaster
 * [new ref]         bef145dd141a22e3810403cd54cd48635eb2c491 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bef145d Perl 5.44 rebuild