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29 lines
1.1 KiB
XML
29 lines
1.1 KiB
XML
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<section xmlns="http://docbook.org/ns/docbook"
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xmlns:xlink="http://www.w3.org/1999/xlink"
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xmlns:xi="http://www.w3.org/2001/XInclude"
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version="5.0"
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xml:id="ssec-gc-roots">
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<title>Garbage Collector Roots</title>
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<para>The roots of the garbage collector are all store paths to which
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there are symlinks in the directory
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<filename><replaceable>prefix</replaceable>/nix/var/nix/gcroots</filename>.
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For instance, the following command makes the path
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<filename>/nix/store/d718ef...-foo</filename> a root of the collector:
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<screen>
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$ ln -s /nix/store/d718ef...-foo /nix/var/nix/gcroots/bar</screen>
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That is, after this command, the garbage collector will not remove
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<filename>/nix/store/d718ef...-foo</filename> or any of its
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dependencies.</para>
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<para>Subdirectories of
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<filename><replaceable>prefix</replaceable>/nix/var/nix/gcroots</filename>
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are also searched for symlinks. Symlinks to non-store paths are
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followed and searched for roots, but symlinks to non-store paths
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<emphasis>inside</emphasis> the paths reached in that way are not
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followed to prevent infinite recursion.</para>
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</section>
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