$ git clone -n https://src.fedoraproject.org/rpms/rust-z-base-32.git /var/lib/mock/f45-build-46322-833/root/chroot_tmpdir/scmroot/rust-z-base-32
Cloning into '/var/lib/mock/f45-build-46322-833/root/chroot_tmpdir/scmroot/rust-z-base-32'...
$ git fetch origin 1a57934159e9166e49601226c816e1cb4180eb5d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-z-base-32
 * [new ref]         1a57934159e9166e49601226c816e1cb4180eb5d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1a57934 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild