$ git clone -n https://src.fedoraproject.org/rpms/rust-onefetch-manifest.git /var/lib/mock/f42-build-side-1-3506308-45996/root/chroot_tmpdir/scmroot/rust-onefetch-manifest
Cloning into '/var/lib/mock/f42-build-side-1-3506308-45996/root/chroot_tmpdir/scmroot/rust-onefetch-manifest'...
$ git fetch origin 59622c7b9b4ff76f746dd3e6e15f50be98f70277:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-onefetch-manifest
 * [new ref]         59622c7b9b4ff76f746dd3e6e15f50be98f70277 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 59622c7 Update cargo_toml from 0.21.0 to 0.22.1