$ git clone -n https://src.fedoraproject.org/rpms/celestia.git /var/lib/mock/f39-build-1627871-39402/root/chroot_tmpdir/scmroot/celestia
Cloning into '/var/lib/mock/f39-build-1627871-39402/root/chroot_tmpdir/scmroot/celestia'...
$ git fetch origin c0b09c2544b918017e89bdff714ee9322c6013e4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/celestia
 * [new ref]         c0b09c2544b918017e89bdff714ee9322c6013e4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c0b09c2 Merge branch 'rawhide' into f39