$ git clone -n https://src.fedoraproject.org/rpms/perl-YAML-LibYAML.git /var/lib/mock/f41-build-816888-150476/root/chroot_tmpdir/scmroot/perl-YAML-LibYAML
Cloning into '/var/lib/mock/f41-build-816888-150476/root/chroot_tmpdir/scmroot/perl-YAML-LibYAML'...
$ git fetch origin e01b1c6b615341d597cc13fab4be5a84159c8400:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-YAML-LibYAML
 * [new ref]         e01b1c6b615341d597cc13fab4be5a84159c8400 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e01b1c6 Perl 5.40 re-rebuild of bootstrapped packages