$ git clone -n https://src.fedoraproject.org/rpms/rust-cxxbridge-flags.git /var/lib/mock/f39-build-2188984-51409/root/chroot_tmpdir/scmroot/rust-cxxbridge-flags
Cloning into '/var/lib/mock/f39-build-2188984-51409/root/chroot_tmpdir/scmroot/rust-cxxbridge-flags'...
$ git fetch origin 531e95949edba688cd05c1d8a833dae682563ea3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-cxxbridge-flags
 * [new ref]         531e95949edba688cd05c1d8a833dae682563ea3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 531e959 Update to version 1.0.114; Fixes RHBZ#2254856