$ git clone -n https://src.fedoraproject.org/rpms/rust-nu-command.git /var/lib/mock/f40-build-1575293-24020/root/chroot_tmpdir/scmroot/rust-nu-command
Cloning into '/var/lib/mock/f40-build-1575293-24020/root/chroot_tmpdir/scmroot/rust-nu-command'...
$ git fetch origin b7fabea471a047928da38c74bc29bd3dc9d52b7d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-nu-command
 * [new ref]         b7fabea471a047928da38c74bc29bd3dc9d52b7d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b7fabea Update to 0.91.0 (rhbz#2267999)