701fc1fdb1
This improves the documentation for `spack external find` in several ways: * Provide a code example of implementing `determine_spec_details` for a package * Explain how to define executables to look for (and also e.g. that they are treated as regular expressions and so can pull in unexpected files). * Add the "why" for a couple of constraints (i.e. explain that this logic only works for build/run deps because it examines `PATH` for executables) * Spread the docs between build customization and packaging sections * Add cross-references * Add a label so that `spack external find` is linked from the command reference. |
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