$ git clone -n https://src.fedoraproject.org/rpms/rust-nu-cli.git /var/lib/mock/f41-build-side-1-3149632-40529/root/chroot_tmpdir/scmroot/rust-nu-cli
Cloning into '/var/lib/mock/f41-build-side-1-3149632-40529/root/chroot_tmpdir/scmroot/rust-nu-cli'...
$ git fetch origin f265248edbc1e8265916496b9b5bd3863dd3020c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-nu-cli
 * [new ref]         f265248edbc1e8265916496b9b5bd3863dd3020c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f265248 Allow which 7