$ git clone -n https://src.fedoraproject.org/rpms/rust-slog-json.git /var/lib/mock/f45-build-45018-820/root/chroot_tmpdir/scmroot/rust-slog-json
Cloning into '/var/lib/mock/f45-build-45018-820/root/chroot_tmpdir/scmroot/rust-slog-json'...
$ git fetch origin f72babe1eea128d2f333075ceb11aba9f453a27d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-slog-json
 * [new ref]         f72babe1eea128d2f333075ceb11aba9f453a27d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f72babe Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild