$ git clone -n https://src.fedoraproject.org/rpms/rust-cxxbridge-macro.git /var/lib/mock/f40-build-2035765-47994/root/chroot_tmpdir/scmroot/rust-cxxbridge-macro
Cloning into '/var/lib/mock/f40-build-2035765-47994/root/chroot_tmpdir/scmroot/rust-cxxbridge-macro'...
$ git fetch origin 01846f1e9287135248c946be29541879b4fcfbae:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-cxxbridge-macro
 * [new ref]         01846f1e9287135248c946be29541879b4fcfbae -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 01846f1 update to version 1.0.110 (rhbz#2246684)