$ git clone -n https://src.fedoraproject.org/rpms/R-httpuv.git /var/lib/mock/f42-build-3267384-41262/root/chroot_tmpdir/scmroot/R-httpuv
Cloning into '/var/lib/mock/f42-build-3267384-41262/root/chroot_tmpdir/scmroot/R-httpuv'...
$ git fetch origin 10b7c27aec5f40bd80baf85c41b7aef3dbc7e8d9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-httpuv
 * [new ref]         10b7c27aec5f40bd80baf85c41b7aef3dbc7e8d9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 10b7c27 Rebuilt for https://fedoraproject.org/wiki/Fedora_42_Mass_Rebuild