$ git clone -n https://src.fedoraproject.org/rpms/rust-fsio.git /var/lib/mock/f45-build-41735-785/root/chroot_tmpdir/scmroot/rust-fsio
Cloning into '/var/lib/mock/f45-build-41735-785/root/chroot_tmpdir/scmroot/rust-fsio'...
$ git fetch origin 1a3a00e85d9656b1ae830f1a25a52f50da91242b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-fsio
 * [new ref]         1a3a00e85d9656b1ae830f1a25a52f50da91242b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1a3a00e Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild