$ git clone -n https://src.fedoraproject.org/rpms/rust-unsafe-libyaml.git /var/lib/mock/f40-build-2040533-48364/root/chroot_tmpdir/scmroot/rust-unsafe-libyaml
Cloning into '/var/lib/mock/f40-build-2040533-48364/root/chroot_tmpdir/scmroot/rust-unsafe-libyaml'...
$ git fetch origin 46f8027530ccceb62f1074e8c40ea14be959c0ba:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-unsafe-libyaml
 * [new ref]         46f8027530ccceb62f1074e8c40ea14be959c0ba -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 46f8027 Update to version 0.2.9; Fixes RHBZ#2223146