$ git clone -n https://src.fedoraproject.org/rpms/ncdu.git /var/lib/mock/f40-build-2012501-45791/root/chroot_tmpdir/scmroot/ncdu
Cloning into '/var/lib/mock/f40-build-2012501-45791/root/chroot_tmpdir/scmroot/ncdu'...
$ git fetch origin 9329777ce777fb6dd9573f1b7b9cfd3ba6491077:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ncdu
 * [new ref]         9329777ce777fb6dd9573f1b7b9cfd3ba6491077 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9329777 Update to 1.19