$ git clone -n https://src.fedoraproject.org/rpms/rust-serde_stacker.git /var/lib/mock/f40-build-2260608-54416/root/chroot_tmpdir/scmroot/rust-serde_stacker
Cloning into '/var/lib/mock/f40-build-2260608-54416/root/chroot_tmpdir/scmroot/rust-serde_stacker'...
$ git fetch origin ea28ff156e9a8082328dfe80291255f0387ab071:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-serde_stacker
 * [new ref]         ea28ff156e9a8082328dfe80291255f0387ab071 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ea28ff1 Update to version 0.1.11; Fixes RHBZ#2256500