$ git clone -n https://src.fedoraproject.org/rpms/rust-associative-cache.git /var/lib/mock/f40-build-2034853-47917/root/chroot_tmpdir/scmroot/rust-associative-cache
Cloning into '/var/lib/mock/f40-build-2034853-47917/root/chroot_tmpdir/scmroot/rust-associative-cache'...
$ git fetch origin d270b199dea813e749fa2b7172ee480cdfcb026f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-associative-cache
 * [new ref]         d270b199dea813e749fa2b7172ee480cdfcb026f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d270b19 Update to 2.0.0. Fixes rhbz#2203294.