$ git clone -n https://src.fedoraproject.org/rpms/rust-gstreamer-player.git /var/lib/mock/f40-build-2100739-50482/root/chroot_tmpdir/scmroot/rust-gstreamer-player
Cloning into '/var/lib/mock/f40-build-2100739-50482/root/chroot_tmpdir/scmroot/rust-gstreamer-player'...
$ git fetch origin 56a9af8a53efa27579f373b478be03c02ddb2e11:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-gstreamer-player
 * [new ref]         56a9af8a53efa27579f373b478be03c02ddb2e11 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 56a9af8 Regenerate with rust2rpm v25