$ git clone -n https://src.fedoraproject.org/rpms/rust-nasm-rs.git /var/lib/mock/f45-build-43314-801/root/chroot_tmpdir/scmroot/rust-nasm-rs
Cloning into '/var/lib/mock/f45-build-43314-801/root/chroot_tmpdir/scmroot/rust-nasm-rs'...
$ git fetch origin 39a5e35817af51cd6d45a81bc73feb3cc5c665da:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-nasm-rs
 * [new ref]         39a5e35817af51cd6d45a81bc73feb3cc5c665da -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 39a5e35 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild