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Add to glossary and clarify garbage collection

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While trying to understand garbage collection it was not immediately
clear that only the runtime dependency closure of output paths
would be kept (instead of the build-time dependency closure).
This commit attempts to clarify this by expanding some of the
glossary definitions and extending the Garbage Collection
section.
This commit is contained in:
Sean Seefried 2018-04-12 19:23:24 +10:00
parent dc0a542c9f
commit 2ef8f0608c
3 changed files with 44 additions and 16 deletions
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8
doc/manual/packages/garbage-collection.xml
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@ -52,6 +52,14 @@ garbage collector as follows:
<screen>
$ nix-store --gc</screen>
The behaviour of the gargage collector is affected by the <literal>keep-
derivations</literal> (default: true) and <literal>keep-outputs</literal>
(default: false) options in the Nix configuration file. The defaults will ensure
that all derivations that are not build-time dependencies of garbage collector roots
will be collected but that all output paths that are not runtime dependencies
will be collected. (This is usually what you want, but while you are developing
it may make sense to keep outputs to ensure that rebuild times are quick.)
If you are feeling uncertain, you can also first view what files would
be deleted: