$ git clone -n https://src.fedoraproject.org/rpms/rust-serde_yaml0.8.git /var/lib/mock/f45-build-44831-818/root/chroot_tmpdir/scmroot/rust-serde_yaml0.8
Cloning into '/var/lib/mock/f45-build-44831-818/root/chroot_tmpdir/scmroot/rust-serde_yaml0.8'...
$ git fetch origin efd7c848c78fbd327991bbbc5d71bebb00a3e04e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-serde_yaml0.8
 * [new ref]         efd7c848c78fbd327991bbbc5d71bebb00a3e04e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at efd7c84 Regenerate with rust2rpm v28