$ git clone -n https://src.fedoraproject.org/rpms/rust-yaml-rust.git /var/lib/mock/f45-build-46248-832/root/chroot_tmpdir/scmroot/rust-yaml-rust
Cloning into '/var/lib/mock/f45-build-46248-832/root/chroot_tmpdir/scmroot/rust-yaml-rust'...
$ git fetch origin 3bb0280f26981c53abd7f637042f16a3bf31e963:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-yaml-rust
 * [new ref]         3bb0280f26981c53abd7f637042f16a3bf31e963 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3bb0280 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild