$ git clone -n https://src.fedoraproject.org/rpms/libarrow.git /var/lib/mock/f39-build-1583646-38129/root/chroot_tmpdir/scmroot/libarrow
Cloning into '/var/lib/mock/f39-build-1583646-38129/root/chroot_tmpdir/scmroot/libarrow'...
$ git fetch origin 9adebaccf154c368676be1a650c651ea9d3ac5aa:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libarrow
 * [new ref]         9adebaccf154c368676be1a650c651ea9d3ac5aa -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9adebac Rebuilt for abseil-cpp-20230802.0