$ git clone -n https://src.fedoraproject.org/rpms/rust-serde_yaml.git /var/lib/mock/f45-build-44856-818/root/chroot_tmpdir/scmroot/rust-serde_yaml
Cloning into '/var/lib/mock/f45-build-44856-818/root/chroot_tmpdir/scmroot/rust-serde_yaml'...
$ git fetch origin 856fa9ef3b0eb1d8ea876e1dd9914acc2f63f113:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-serde_yaml
 * [new ref]         856fa9ef3b0eb1d8ea876e1dd9914acc2f63f113 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 856fa9e Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild