$ git clone -n https://src.fedoraproject.org/rpms/rust-zerofrom.git /var/lib/mock/f45-build-46355-833/root/chroot_tmpdir/scmroot/rust-zerofrom
Cloning into '/var/lib/mock/f45-build-46355-833/root/chroot_tmpdir/scmroot/rust-zerofrom'...
$ git fetch origin 7b35cae7ca5afe460d0ea2aa0b9379a3f1d4a048:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-zerofrom
 * [new ref]         7b35cae7ca5afe460d0ea2aa0b9379a3f1d4a048 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7b35cae Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild