$ git clone -n https://src.fedoraproject.org/rpms/rust-smol.git /var/lib/mock/f45-build-45050-820/root/chroot_tmpdir/scmroot/rust-smol
Cloning into '/var/lib/mock/f45-build-45050-820/root/chroot_tmpdir/scmroot/rust-smol'...
$ git fetch origin 1d9c3574323a75cefeb2a4a688d1df2f7c007d0e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-smol
 * [new ref]         1d9c3574323a75cefeb2a4a688d1df2f7c007d0e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1d9c357 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild