$ git clone -n https://src.fedoraproject.org/rpms/kf5-kmbox.git /var/lib/mock/f39-build-1566527-37589/root/chroot_tmpdir/scmroot/kf5-kmbox
Cloning into '/var/lib/mock/f39-build-1566527-37589/root/chroot_tmpdir/scmroot/kf5-kmbox'...
$ git fetch origin ac5cc01ca80dabad1357ba9c085fc5d16538f9c8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf5-kmbox
 * [new ref]         ac5cc01ca80dabad1357ba9c085fc5d16538f9c8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ac5cc01 23.08.2