$ git clone -n https://src.fedoraproject.org/rpms/rust-z85.git /var/lib/mock/f45-build-46342-833/root/chroot_tmpdir/scmroot/rust-z85
Cloning into '/var/lib/mock/f45-build-46342-833/root/chroot_tmpdir/scmroot/rust-z85'...
$ git fetch origin 4b7a0b413ee508b04494d76f5a01f6f84d24a6e9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-z85
 * [new ref]         4b7a0b413ee508b04494d76f5a01f6f84d24a6e9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4b7a0b4 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild