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* Command `nix ensure' which is like `nix getpkg' except that if the
has refers to a run action it will just ensure that the imports are
there.
* Command `nix closure' to print out the closure of the set of
descriptors under the import relation, starting at a set of roots.
This can be used for garbage collection (e.g., given a list of
`activated' packages, we can delete all packages not reachable from
those).
* Command `nix graph' to print out a Dot graph of the dependency
graph.
* `nix-addroot' adds a root for the (unimplemented) garbage collector.
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the build or run action should be perfomed on. This ensures that
descriptors have different hashes on different platforms.
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action. Run actions are described by uniquely hashed descriptors,
just like build actions. Therefore run actions can have
dependencies, but these need not be the same as the build time
dependencies (e.g., at runtime we can link against a different
version of a dynamic library). Example:
nix run 31d6bf4c171282367065e0deecd7c579
will run the Pan 0.13.91 newsreader with gtkspell support.
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files) are now referenced using their cryptographic hashes.
This ensures that if two package descriptors have the same contents,
then they describe the same package. This property is not as
trivial as it sounds: generally import relations cause this property
not to hold w.r.t. temporality. But since imports also use hashes
to reference other packages, equality follows by induction.
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