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add fetchTree docs #6740

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elikoga wants to merge 2 commits into from
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add fetchTree docs #6740

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1b6876f
add fetchTree docs
elikoga Jun 29, 2022
9a3e681
Update src/libexpr/primops/fetchTree.cc
elikoga Jul 11, 2022
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22 changes: 20 additions & 2 deletions src/libexpr/primops/fetchTree.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -182,8 +182,26 @@ static void prim_fetchTree(EvalState & state, const PosIdx pos, Value * * args,
fetchTree(state, pos, args, v, std::nullopt, FetchTreeParams { .allowNameArgument = false });
}

// FIXME: document
static RegisterPrimOp primop_fetchTree("fetchTree", 1, prim_fetchTree);
static RegisterPrimOp primop_fetchTree({
.name = "fetchTree",
.args = {"args"},
.arity = 1,
.doc = R"(
Introduced in 2.4

The fetcher infrastructure is exposed via the `fetchTree` built-in.

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`builtins.fetchTree` allows fetching a source tree using any
backends supported by the fetcher infrastructure. It subsumes the

@edolstra edolstra Jul 11, 2022

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Shouldn't mention "fetcher infrastructure". Instead it can refer to the docs on flake references (https://nixos.org/manual/nix/stable/command-ref/new-cli/nix3-flake.html#flake-references), specifically the attrset form.

functionality of existing built-ins like `fetchGit`,
`fetchMercurial` and `fetchTarball`.

`builtins.fetchTree` can be used to fetch
plain files over the `http(s)` and `file` protocols in addition to
directory tarballs.
)",

@edolstra edolstra Jul 11, 2022

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There should be one or two examples here of how to use fetchTree.

It should also mention that fetchTree is experimental and that it requires a locked flakeref in pure eval mode (which is the default).

.fun = prim_fetchTree,
});

static void fetch(EvalState & state, const PosIdx pos, Value * * args, Value & v,
const std::string & who, bool unpack, std::string name)
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