2023-03-23 17:27:41 +02:00
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# Name
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`nix-store --realise` - realise specified store paths
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# Synopsis
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`nix-store` {`--realise` | `-r`} *paths…* [`--dry-run`]
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# Description
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The operation `--realise` essentially “builds” the specified store
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paths. Realisation is a somewhat overloaded term:
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- If the store path is a *derivation*, realisation ensures that the
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output paths of the derivation are [valid] (i.e.,
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the output path and its closure exist in the file system). This
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can be done in several ways. First, it is possible that the
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outputs are already valid, in which case we are done
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immediately. Otherwise, there may be [substitutes]
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that produce the outputs (e.g., by downloading them). Finally, the
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outputs can be produced by running the build task described
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by the derivation.
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- If the store path is not a derivation, realisation ensures that the
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specified path is valid (i.e., it and its closure exist in the file
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system). If the path is already valid, we are done immediately.
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Otherwise, the path and any missing paths in its closure may be
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produced through substitutes. If there are no (successful)
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substitutes, realisation fails.
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[valid]: @docroot@/glossary.md#gloss-validity
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[substitutes]: @docroot@/glossary.md#gloss-substitute
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The output path of each derivation is printed on standard output. (For
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non-derivations argument, the argument itself is printed.)
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The following flags are available:
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- `--dry-run`\
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Print on standard error a description of what packages would be
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built or downloaded, without actually performing the operation.
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- `--ignore-unknown`\
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If a non-derivation path does not have a substitute, then silently
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ignore it.
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- `--check`\
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This option allows you to check whether a derivation is
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deterministic. It rebuilds the specified derivation and checks
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whether the result is bitwise-identical with the existing outputs,
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printing an error if that’s not the case. The outputs of the
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specified derivation must already exist. When used with `-K`, if an
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output path is not identical to the corresponding output from the
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previous build, the new output path is left in
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`/nix/store/name.check.`
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2023-06-22 21:23:25 +03:00
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{{#include ../status-build-failure.md}}
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2023-03-23 17:27:41 +02:00
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{{#include ./opt-common.md}}
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{{#include ../opt-common.md}}
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{{#include ../env-common.md}}
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# Examples
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This operation is typically used to build [store derivation]s produced by
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[`nix-instantiate`](@docroot@/command-ref/nix-instantiate.md):
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[store derivation]: @docroot@/glossary.md#gloss-store-derivation
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```console
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2023-04-30 16:52:38 +03:00
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$ nix-store --realise $(nix-instantiate ./test.nix)
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2023-03-23 17:27:41 +02:00
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/nix/store/31axcgrlbfsxzmfff1gyj1bf62hvkby2-aterm-2.3.1
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```
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This is essentially what [`nix-build`](@docroot@/command-ref/nix-build.md) does.
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To test whether a previously-built derivation is deterministic:
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```console
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2023-04-30 16:52:38 +03:00
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$ nix-build '<nixpkgs>' --attr hello --check -K
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2023-03-23 17:27:41 +02:00
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```
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Use [`nix-store --read-log`](./read-log.md) to show the stderr and stdout of a build:
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```console
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$ nix-store --read-log $(nix-instantiate ./test.nix)
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```
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