$ git clone -n https://src.fedoraproject.org/rpms/k3b.git /var/lib/mock/f45-build-52733-912/root/chroot_tmpdir/scmroot/k3b
Cloning into '/var/lib/mock/f45-build-52733-912/root/chroot_tmpdir/scmroot/k3b'...
$ git fetch origin f32654da9b2bf17f0e92f3bd8a94f1d7fd6eb1b3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/k3b
 * [new ref]         f32654da9b2bf17f0e92f3bd8a94f1d7fd6eb1b3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f32654d Rebuilt for FFmpeg 9