$ git clone -n https://src.fedoraproject.org/rpms/rust-hashbrown0.11.git /var/lib/mock/f40-build-2183400-51262/root/chroot_tmpdir/scmroot/rust-hashbrown0.11
Cloning into '/var/lib/mock/f40-build-2183400-51262/root/chroot_tmpdir/scmroot/rust-hashbrown0.11'...
$ git fetch origin d13c398be2106149d8e4d3d1aead5583dcd5672d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-hashbrown0.11
 * [new ref]         d13c398be2106149d8e4d3d1aead5583dcd5672d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d13c398 Regenerate with rust2rpm v24