$ git clone -n https://src.fedoraproject.org/rpms/rust-subtle.git /var/lib/mock/f45-build-45234-821/root/chroot_tmpdir/scmroot/rust-subtle
Cloning into '/var/lib/mock/f45-build-45234-821/root/chroot_tmpdir/scmroot/rust-subtle'...
$ git fetch origin 33766eff4565a04dd739947cd40723ad8e9d344c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-subtle
 * [new ref]         33766eff4565a04dd739947cd40723ad8e9d344c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 33766ef Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild