$ git clone -n https://src.fedoraproject.org/rpms/rust-gstreamer-pbutils.git /var/lib/mock/f40-build-2208658-52138/root/chroot_tmpdir/scmroot/rust-gstreamer-pbutils
Cloning into '/var/lib/mock/f40-build-2208658-52138/root/chroot_tmpdir/scmroot/rust-gstreamer-pbutils'...
$ git fetch origin 4f5b236a9cb774616c88ab2fda796a2dc67b44cf:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-gstreamer-pbutils
 * [new ref]         4f5b236a9cb774616c88ab2fda796a2dc67b44cf -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4f5b236 Update to version 0.21.1; Fixes RHBZ#2242111