$ git clone -n https://src.fedoraproject.org/rpms/rust-gstreamer-base-sys.git /var/lib/mock/f42-build-side-1-3584379-46893/root/chroot_tmpdir/scmroot/rust-gstreamer-base-sys
Cloning into '/var/lib/mock/f42-build-side-1-3584379-46893/root/chroot_tmpdir/scmroot/rust-gstreamer-base-sys'...
$ git fetch origin 9e54d33e45132b0bb4d3e77a53a17bb250e16570:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-gstreamer-base-sys
 * [new ref]         9e54d33e45132b0bb4d3e77a53a17bb250e16570 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9e54d33 Update to version 0.23.6; Fixes RHBZ#2365898