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clarify relation of tasks and plans

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Valentin Gagarin 2022-05-12 12:30:28 +02:00
parent 2a8532fb61
commit 689b32a543
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doc/manual/src/architecture/architecture.md
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@ -13,21 +13,21 @@ Nix consists of hierarchical [layers](https://en.m.wikipedia.org/wiki/Multitier_
| evaluates | manages | evaluates | manages
V | V |
[ configuration language ] | [ configuration language ] |
| V | |
+-------------------------------|---------------------------------+ +-------------------------------|---------------------V-----------+
| store | | | store | evaluates to |
| | evaluates to | | .............................V............................... |
| | | | : build plan : |
| referenced by V builds | | : referenced by builds : |
| [ build input ] --> [ build task ] --> [ build result ] | | : [ build input ] --> [ build task ] --> [ build result ] : |
| | | :...........................................................: |
+-----------------------------------------------------------------+ +-----------------------------------------------------------------+
``` ```
At the top is the *command line interface*, translating from invocations of Nix executables to interactions with the underlying layers. At the top is the *command line interface*, translating from invocations of Nix executables to interactions with the underlying layers.
Below that is the *Nix language*, a [purely functional](https://en.m.wikipedia.org/wiki/Purely_functional_programming) configuration language. Below that is the *Nix language*, a [purely functional](https://en.m.wikipedia.org/wiki/Purely_functional_programming) configuration language.
It is used to compose expressions which ultimately evaluate to self-contained *build tasks*, used to derive *build results* from referenced *build inputs*. It is used to compose expressions which ultimately evaluate to self-contained *build plans*, made up *build tasks* used to derive *build results* from referenced *build inputs*.
::: {.note} ::: {.note}
The Nix language itself does not have a notion of *packages* or *configurations*. The Nix language itself does not have a notion of *packages* or *configurations*.
@ -40,4 +40,3 @@ The command line and Nix language are what users interact with most.
Underlying everything is the *Nix store*, a mechanism to keep track of build tasks, data, and references between them. Underlying everything is the *Nix store*, a mechanism to keep track of build tasks, data, and references between them.
It can also execute *build instructions*, captured in the build tasks, to produce new data. It can also execute *build instructions*, captured in the build tasks, to produce new data.
A series of build tasks is a *build plan*.