$ git clone -n https://src.fedoraproject.org/rpms/rust-rpds.git /var/lib/mock/f40-build-2205838-52032/root/chroot_tmpdir/scmroot/rust-rpds
Cloning into '/var/lib/mock/f40-build-2205838-52032/root/chroot_tmpdir/scmroot/rust-rpds'...
$ git fetch origin f39ea1700cab289f0765bcf607409e197ea4549c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-rpds
 * [new ref]         f39ea1700cab289f0765bcf607409e197ea4549c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f39ea17 Do not exclude i686