$ git clone -n https://src.fedoraproject.org/rpms/rust-gst-plugin-mp4.git /var/lib/mock/f42-build-side-1-3588875-46951/root/chroot_tmpdir/scmroot/rust-gst-plugin-mp4
Cloning into '/var/lib/mock/f42-build-side-1-3588875-46951/root/chroot_tmpdir/scmroot/rust-gst-plugin-mp4'...
$ git fetch origin a8c50ed98ffcf5365ee8ca2601df785b19366afe:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-gst-plugin-mp4
 * [new ref]         a8c50ed98ffcf5365ee8ca2601df785b19366afe -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a8c50ed Update to 0.13.6 (rhbz#2365929)