$ git clone -n http://fedora.riscv.rocks:3000/rpms/ffmpeg.git /var/lib/mock/f40-build-805827-144921/root/chroot_tmpdir/scmroot/ffmpeg
Cloning into '/var/lib/mock/f40-build-805827-144921/root/chroot_tmpdir/scmroot/ffmpeg'...
$ git fetch origin 0697d57cf3e365bab4359df058e1661be9a8c540:KOJI_FETCH_HEAD
From http://fedora.riscv.rocks:3000/rpms/ffmpeg
 * [new ref]         0697d57cf3e365bab4359df058e1661be9a8c540 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0697d57 Bootstrap (vpx)