$ git clone -n https://src.fedoraproject.org/rpms/fluent-bit.git /var/lib/mock/f40-build-2236872-53525/root/chroot_tmpdir/scmroot/fluent-bit
Cloning into '/var/lib/mock/f40-build-2236872-53525/root/chroot_tmpdir/scmroot/fluent-bit'...
$ git fetch origin 7d7be4c8edf3506f23610c853e1bc0a96e4e7c9c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/fluent-bit
 * [new ref]         7d7be4c8edf3506f23610c853e1bc0a96e4e7c9c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7d7be4c Additional C compatibility fixes