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37 lines
1.3 KiB
Markdown
37 lines
1.3 KiB
Markdown
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# Options
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The following options are allowed for all `nix-store` operations, but may not always have an effect.
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- <span id="opt-add-root">[`--add-root`](#opt-add-root)</span> *path*
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Causes the result of a realisation (`--realise` and
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`--force-realise`) to be registered as a root of the garbage
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collector. *path* will be created as a symlink to the resulting
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store path. In addition, a uniquely named symlink to *path* will
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be created in `/nix/var/nix/gcroots/auto/`. For instance,
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```console
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$ nix-store --add-root /home/eelco/bla/result -r ...
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$ ls -l /nix/var/nix/gcroots/auto
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lrwxrwxrwx 1 ... 2005-03-13 21:10 dn54lcypm8f8... -> /home/eelco/bla/result
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$ ls -l /home/eelco/bla/result
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lrwxrwxrwx 1 ... 2005-03-13 21:10 /home/eelco/bla/result -> /nix/store/1r11343n6qd4...-f-spot-0.0.10
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```
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Thus, when `/home/eelco/bla/result` is removed, the GC root in the
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`auto` directory becomes a dangling symlink and will be ignored by
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the collector.
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> **Warning**
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>
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> Note that it is not possible to move or rename GC roots, since
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> the symlink in the `auto` directory will still point to the old
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> location.
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If there are multiple results, then multiple symlinks will be
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created by sequentially numbering symlinks beyond the first one
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(e.g., `foo`, `foo-2`, `foo-3`, and so on).
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