$ git clone -n https://src.fedoraproject.org/rpms/rust-mbox.git /var/lib/mock/f39-build-1534603-36233/root/chroot_tmpdir/scmroot/rust-mbox
Cloning into '/var/lib/mock/f39-build-1534603-36233/root/chroot_tmpdir/scmroot/rust-mbox'...
$ git fetch origin 1bec320b301d7f2ebda22061527ad8e853b725b1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-mbox
 * [new ref]         1bec320b301d7f2ebda22061527ad8e853b725b1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1bec320 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild