$ git clone -n https://src.fedoraproject.org/rpms/libXmu.git /var/lib/mock/f39-build-1465107-33559/root/chroot_tmpdir/scmroot/libXmu
Cloning into '/var/lib/mock/f39-build-1465107-33559/root/chroot_tmpdir/scmroot/libXmu'...
$ git fetch origin a1d09dec3f677744196e0aa8e6eedfc9ebe03dcd:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libXmu
 * [new ref]         a1d09dec3f677744196e0aa8e6eedfc9ebe03dcd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a1d09de Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild