$ git clone -n https://src.fedoraproject.org/rpms/rust-gstreamer-player.git /var/lib/mock/f40-build-2706952-71245/root/chroot_tmpdir/scmroot/rust-gstreamer-player
Cloning into '/var/lib/mock/f40-build-2706952-71245/root/chroot_tmpdir/scmroot/rust-gstreamer-player'...
$ git fetch origin abf2354bb751d9ca95378e5cfef08eb74ddd713d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-gstreamer-player
 * [new ref]         abf2354bb751d9ca95378e5cfef08eb74ddd713d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at abf2354 Update to version 0.22.0; Fixes RHBZ#2263365