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Diffstat (limited to 'lib/spack/docs/environments.rst')
| -rw-r--r-- | lib/spack/docs/environments.rst | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/lib/spack/docs/environments.rst b/lib/spack/docs/environments.rst index 76b974ff62..12f6f4121c 100644 --- a/lib/spack/docs/environments.rst +++ b/lib/spack/docs/environments.rst @@ -356,6 +356,18 @@ command also stores a Spack repo containing the ``package.py`` file used at install time for each package in the ``repos/`` directory in the Environment. +The ``--no-add`` option can be used in a concrete environment to tell +spack to install specs already present in the environment but not to +add any new root specs to the environment. For root specs provided +to ``spack install`` on the command line, ``--no-add`` is the default, +while for dependency specs on the other hand, it is optional. In other +words, if there is an unambiguous match in the active concrete environment +for a root spec provided to ``spack install`` on the command line, spack +does not require you to specify the ``--no-add` option to prevent the spec +from being added again. At the same time, a spec that already exists in the +environment, but only as a dependency, will be added to the environment as a +root spec without the ``--no-add`` option. + ^^^^^^^ Loading ^^^^^^^ |