mirror of
https://github.com/NixOS/nix.git
synced 2024-11-22 06:42:28 +00:00
document fetchTree (#9258)
* document `fetchTree` * display experimental feature note at the top we have to enable the new `fetchTree` experimental feature to render it at all. this was a bug introduced when adding that new feature flag. Co-authored-by: tomberek <tomberek@users.noreply.github.com> Co-authored-by: Robert Hensing <roberth@users.noreply.github.com> Co-authored-by: Silvan Mosberger <github@infinisil.com>
This commit is contained in:
Valentin Gagarin
GitHub
parent
b1842a4f05
commit
3c200da242
@ -8,7 +8,15 @@ let
|
||||
showBuiltin = name: { doc, args, arity, experimental-feature }:
|
||||
let
|
||||
experimentalNotice = optionalString (experimental-feature != null) ''
|
||||
This function is only available if the [${experimental-feature}](@docroot@/contributing/experimental-features.md#xp-feature-${experimental-feature}) experimental feature is enabled.
|
||||
> **Note**
|
||||
>
|
||||
> This function is only available if the [`${experimental-feature}` experimental feature](@docroot@/contributing/experimental-features.md#xp-feature-${experimental-feature}) is enabled.
|
||||
>
|
||||
> For example, include the following in [`nix.conf`](@docroot@/command-ref/conf-file.md):
|
||||
>
|
||||
> ```
|
||||
> extra-experimental-features = ${experimental-feature}
|
||||
> ```
|
||||
'';
|
||||
in
|
||||
squash ''
|
||||
@ -17,10 +25,9 @@ let
|
||||
</dt>
|
||||
<dd>
|
||||
|
||||
${doc}
|
||||
|
||||
${experimentalNotice}
|
||||
|
||||
${doc}
|
||||
</dd>
|
||||
'';
|
||||
listArgs = args: concatStringsSep " " (map (s: "<var>${s}</var>") args);
|
||||
|
||||
@ -20,10 +20,10 @@ let
|
||||
else "`${setting}`";
|
||||
# separate body to cleanly handle indentation
|
||||
body = ''
|
||||
${description}
|
||||
|
||||
${experimentalFeatureNote}
|
||||
|
||||
${description}
|
||||
|
||||
**Default:** ${showDefault documentDefault defaultValue}
|
||||
|
||||
${showAliases aliases}
|
||||
|
||||
@ -19,10 +19,10 @@ let
|
||||
result = squash ''
|
||||
# ${name}
|
||||
|
||||
${doc}
|
||||
|
||||
${experimentalFeatureNote}
|
||||
|
||||
${doc}
|
||||
|
||||
## Settings
|
||||
|
||||
${showSettings { prefix = "store-${slug}"; inherit inlineHTML; } settings}
|
||||
|
||||
@ -187,45 +187,215 @@ static RegisterPrimOp primop_fetchTree({
|
||||
.name = "fetchTree",
|
||||
.args = {"input"},
|
||||
.doc = R"(
|
||||
Fetch a source tree or a plain file using one of the supported backends.
|
||||
*input* must be a [flake reference](@docroot@/command-ref/new-cli/nix3-flake.md#flake-references), either in attribute set representation or in the URL-like syntax.
|
||||
The input should be "locked", that is, it should contain a commit hash or content hash unless impure evaluation (`--impure`) is enabled.
|
||||
Fetch a file system tree or a plain file using one of the supported backends and return an attribute set with:
|
||||
|
||||
> **Note**
|
||||
- the resulting fixed-output [store path](@docroot@/glossary.md#gloss-store-path)
|
||||
- the corresponding [NAR](@docroot@/glossary.md#gloss-nar) hash
|
||||
- backend-specific metadata (currently not documented). <!-- TODO: document output attributes -->
|
||||
|
||||
*input* must be an attribute set with the following attributes:
|
||||
|
||||
- `type` (String, required)
|
||||
|
||||
One of the [supported source types](#source-types).
|
||||
This determines other required and allowed input attributes.
|
||||
|
||||
- `narHash` (String, optional)
|
||||
|
||||
The `narHash` parameter can be used to substitute the source of the tree.
|
||||
It also allows for verification of tree contents that may not be provided by the underlying transfer mechanism.
|
||||
If `narHash` is set, the source is first looked up is the Nix store and [substituters](@docroot@/command-ref/conf-file.md#conf-substituters), and only fetched if not available.
|
||||
|
||||
A subset of the output attributes of `fetchTree` can be re-used for subsequent calls to `fetchTree` to produce the same result again.
|
||||
That is, `fetchTree` is idempotent.
|
||||
|
||||
Downloads are cached in `$XDG_CACHE_HOME/nix`.
|
||||
The remote source will be fetched from the network if both are true:
|
||||
- A NAR hash is supplied and the corresponding store path is not [valid](@docroot@/glossary.md#gloss-validity), that is, not available in the store
|
||||
|
||||
> **Note**
|
||||
>
|
||||
> [Substituters](@docroot@/command-ref/conf-file.md#conf-substituters) are not used in fetching.
|
||||
|
||||
- There is no cache entry or the cache entry is older than [`tarball-ttl`](@docroot@/command-ref/conf-file.md#conf-tarball-ttl)
|
||||
|
||||
## Source types
|
||||
|
||||
The following source types and associated input attributes are supported.
|
||||
|
||||
<!-- TODO: It would be soooo much more predictable to work with (and
|
||||
document) if `fetchTree` was a curried call with the first paramter for
|
||||
`type` or an attribute like `builtins.fetchTree.git`! -->
|
||||
|
||||
- `"file"`
|
||||
|
||||
Place a plain file into the Nix store.
|
||||
This is similar to [`builtins.fetchurl`](@docroot@/language/builtins.md#builtins-fetchurl)
|
||||
|
||||
- `url` (String, required)
|
||||
|
||||
Supported protocols:
|
||||
|
||||
- `https`
|
||||
|
||||
> **Example**
|
||||
>
|
||||
> ```nix
|
||||
> fetchTree {
|
||||
> type = "file";
|
||||
> url = "https://example.com/index.html";
|
||||
> }
|
||||
> ```
|
||||
|
||||
- `http`
|
||||
|
||||
Insecure HTTP transfer for legacy sources.
|
||||
|
||||
> **Warning**
|
||||
>
|
||||
> HTTP performs no encryption or authentication.
|
||||
> Use a `narHash` known in advance to ensure the output has expected contents.
|
||||
|
||||
- `file`
|
||||
|
||||
A file on the local file system.
|
||||
|
||||
> **Example**
|
||||
>
|
||||
> ```nix
|
||||
> fetchTree {
|
||||
> type = "file";
|
||||
> url = "file:///home/eelco/nix/README.md";
|
||||
> }
|
||||
> ```
|
||||
|
||||
- `"tarball"`
|
||||
|
||||
Download a tar archive and extract it into the Nix store.
|
||||
This has the same underyling implementation as [`builtins.fetchTarball`](@docroot@/language/builtins.md#builtins-fetchTarball)
|
||||
|
||||
- `url` (String, required)
|
||||
|
||||
> **Example**
|
||||
>
|
||||
> ```nix
|
||||
> fetchTree {
|
||||
> type = "tarball";
|
||||
> url = "https://github.com/NixOS/nixpkgs/tarball/nixpkgs-23.11";
|
||||
> }
|
||||
> ```
|
||||
|
||||
- `"git"`
|
||||
|
||||
Fetch a Git tree and copy it to the Nix store.
|
||||
This is similar to [`builtins.fetchGit`](@docroot@/language/builtins.md#builtins-fetchGit).
|
||||
|
||||
- `url` (String, required)
|
||||
|
||||
The URL formats supported are the same as for Git itself.
|
||||
|
||||
> **Example**
|
||||
>
|
||||
> ```nix
|
||||
> fetchTree {
|
||||
> type = "git";
|
||||
> url = "git@github.com:NixOS/nixpkgs.git";
|
||||
> }
|
||||
> ```
|
||||
|
||||
> **Note**
|
||||
>
|
||||
> If the URL points to a local directory, and no `ref` or `rev` is given, Nix will only consider files added to the Git index, as listed by `git ls-files` but use the *current file contents* of the Git working directory.
|
||||
|
||||
- `ref` (String, optional)
|
||||
|
||||
A [Git reference](https://git-scm.com/book/en/v2/Git-Internals-Git-References), such as a branch or tag name.
|
||||
|
||||
Default: `"HEAD"`
|
||||
|
||||
- `rev` (String, optional)
|
||||
|
||||
A Git revision; a commit hash.
|
||||
|
||||
Default: the tip of `ref`
|
||||
|
||||
- `shallow` (Bool, optional)
|
||||
|
||||
Make a shallow clone when fetching the Git tree.
|
||||
|
||||
Default: `false`
|
||||
|
||||
- `submodules` (Bool, optional)
|
||||
|
||||
Also fetch submodules if available.
|
||||
|
||||
Default: `false`
|
||||
|
||||
- `allRefs` (Bool, optional)
|
||||
|
||||
If set to `true`, always fetch the entire repository, even if the latest commit is still in the cache.
|
||||
Otherwise, only the latest commit is fetched if it is not already cached.
|
||||
|
||||
Default: `false`
|
||||
|
||||
- `lastModified` (Integer, optional)
|
||||
|
||||
Unix timestamp of the fetched commit.
|
||||
|
||||
If set, pass through the value to the output attribute set.
|
||||
Otherwise, generated from the fetched Git tree.
|
||||
|
||||
- `revCount` (Integer, optional)
|
||||
|
||||
Number of revisions in the history of the Git repository before the fetched commit.
|
||||
|
||||
If set, pass through the value to the output attribute set.
|
||||
Otherwise, generated from the fetched Git tree.
|
||||
|
||||
The following input types are still subject to change:
|
||||
|
||||
- `"path"`
|
||||
- `"github"`
|
||||
- `"gitlab"`
|
||||
- `"sourcehut"`
|
||||
- `"mercurial"`
|
||||
|
||||
*input* can also be a [URL-like reference](@docroot@/command-ref/new-cli/nix3-flake.md#flake-references).
|
||||
The additional input types and the URL-like syntax requires the [`flakes` experimental feature](@docroot@/contributing/experimental-features.md#xp-feature-flakes) to be enabled.
|
||||
|
||||
> **Example**
|
||||
>
|
||||
> The URL-like syntax requires the [`flakes` experimental feature](@docroot@/contributing/experimental-features.md#xp-feature-flakes) to be enabled.
|
||||
> Fetch a GitHub repository using the attribute set representation:
|
||||
>
|
||||
> ```nix
|
||||
> builtins.fetchTree {
|
||||
> type = "github";
|
||||
> owner = "NixOS";
|
||||
> repo = "nixpkgs";
|
||||
> rev = "ae2e6b3958682513d28f7d633734571fb18285dd";
|
||||
> }
|
||||
> ```
|
||||
>
|
||||
> This evaluates to the following attribute set:
|
||||
>
|
||||
> ```nix
|
||||
> {
|
||||
> lastModified = 1686503798;
|
||||
> lastModifiedDate = "20230611171638";
|
||||
> narHash = "sha256-rA9RqKP9OlBrgGCPvfd5HVAXDOy8k2SmPtB/ijShNXc=";
|
||||
> outPath = "/nix/store/l5m6qlvfs9sdw14ja3qbzpglcjlb6j1x-source";
|
||||
> rev = "ae2e6b3958682513d28f7d633734571fb18285dd";
|
||||
> shortRev = "ae2e6b3";
|
||||
> }
|
||||
> ```
|
||||
|
||||
Here are some examples of how to use `fetchTree`:
|
||||
|
||||
- Fetch a GitHub repository using the attribute set representation:
|
||||
|
||||
```nix
|
||||
builtins.fetchTree {
|
||||
type = "github";
|
||||
owner = "NixOS";
|
||||
repo = "nixpkgs";
|
||||
rev = "ae2e6b3958682513d28f7d633734571fb18285dd";
|
||||
}
|
||||
```
|
||||
|
||||
This evaluates to the following attribute set:
|
||||
|
||||
```
|
||||
{
|
||||
lastModified = 1686503798;
|
||||
lastModifiedDate = "20230611171638";
|
||||
narHash = "sha256-rA9RqKP9OlBrgGCPvfd5HVAXDOy8k2SmPtB/ijShNXc=";
|
||||
outPath = "/nix/store/l5m6qlvfs9sdw14ja3qbzpglcjlb6j1x-source";
|
||||
rev = "ae2e6b3958682513d28f7d633734571fb18285dd";
|
||||
shortRev = "ae2e6b3";
|
||||
}
|
||||
```
|
||||
|
||||
- Fetch the same GitHub repository using the URL-like syntax:
|
||||
|
||||
```
|
||||
builtins.fetchTree "github:NixOS/nixpkgs/ae2e6b3958682513d28f7d633734571fb18285dd"
|
||||
```
|
||||
> **Example**
|
||||
>
|
||||
> Fetch the same GitHub repository using the URL-like syntax:
|
||||
>
|
||||
> ```nix
|
||||
> builtins.fetchTree "github:NixOS/nixpkgs/ae2e6b3958682513d28f7d633734571fb18285dd"
|
||||
> ```
|
||||
)",
|
||||
.fun = prim_fetchTree,
|
||||
.experimentalFeature = Xp::FetchTree,
|
||||
|
||||
@ -373,6 +373,7 @@ void mainWrapped(int argc, char * * argv)
|
||||
Xp::Flakes,
|
||||
Xp::FetchClosure,
|
||||
Xp::DynamicDerivations,
|
||||
Xp::FetchTree,
|
||||
};
|
||||
evalSettings.pureEval = false;
|
||||
EvalState state({}, openStore("dummy://"));
|
||||
|
||||
Loading…
Reference in New Issue
Block a user