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Document new environment variable expansion in projections (#42963)

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Adding docs and test for #42917

Co-authored-by: Alec Scott <hi@alecbcs.com>
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psakievich
2024-03-04 12:17:08 -07:00
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lib/spack/docs/environments.rst
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@@ -952,6 +952,17 @@ function, as shown in the example below:
^mpi: "{name}-{version}/{^mpi.name}-{^mpi.version}-{compiler.name}-{compiler.version}"
all: "{name}-{version}/{compiler.name}-{compiler.version}"
Projections also permit environment and spack configuration variable
expansions as shown below:
.. code-block:: yaml
projections:
all: "{name}-{version}/{compiler.name}-{compiler.version}/$date/$SYSTEM_ENV_VARIBLE"
where ``$date`` is the spack configuration variable that will expand with the ``YYYY-MM-DD``
format and ``$SYSTEM_ENV_VARIABLE`` is an environment variable defined in the shell.
The entries in the projections configuration file must all be either
specs or the keyword ``all``. For each spec, the projection used will
be the first non-``all`` entry that the spec satisfies, or ``all`` if