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