$ git clone -n https://src.fedoraproject.org/rpms/R-fastmap.git /var/lib/mock/f39-build-1544713-36662/root/chroot_tmpdir/scmroot/R-fastmap
Cloning into '/var/lib/mock/f39-build-1544713-36662/root/chroot_tmpdir/scmroot/R-fastmap'...
$ git fetch origin 3d0b819aeb384a737ead6c3368ac6ed5bd701d66:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-fastmap
 * [new ref]         3d0b819aeb384a737ead6c3368ac6ed5bd701d66 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3d0b819 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild