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Add fetchTree builtin function

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This allows all supported fetchers to be used, e.g.

  builtins.fetchTree {
    type = "github";
    owner = "NixOS";
    repo = "nix";
    rev = "d4df99a334";
  }
This commit is contained in:
Eelco Dolstra 2020-02-11 23:53:46 +01:00
parent d4df99a334
commit 26dacc0983
2 changed files with 67 additions and 0 deletions
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61
src/libexpr/primops/fetchTree.cc Normal file
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#include "primops.hh"
#include "eval-inline.hh"
#include "store-api.hh"
#include "fetchers/fetchers.hh"
#include "fetchers/registry.hh"
namespace nix {
static void prim_fetchTree(EvalState & state, const Pos & pos, Value * * args, Value & v)
{
std::shared_ptr<const fetchers::Input> input;
PathSet context;
state.forceValue(*args[0]);
if (args[0]->type == tAttrs) {
state.forceAttrs(*args[0], pos);
fetchers::Input::Attrs attrs;
for (auto & attr : *args[0]->attrs) {
state.forceValue(*attr.value);
if (attr.value->type == tString)
attrs.emplace(attr.name, attr.value->string.s);
else
throw Error("unsupported attribute type");
}
if (!attrs.count("type"))
throw Error("attribute 'type' is missing in call to 'fetchTree', at %s", pos);
input = fetchers::inputFromAttrs(attrs);
} else
input = fetchers::inputFromURL(state.coerceToString(pos, *args[0], context, false, false));
if (!evalSettings.pureEval && !input->isDirect())
input = lookupInRegistries(state.store, input);
if (evalSettings.pureEval && !input->isImmutable())
throw Error("in pure evaluation mode, 'fetchTree' requires an immutable input");
auto [tree, input2] = input->fetchTree(state.store);
state.mkAttrs(v, 8);
auto storePath = state.store->printStorePath(tree.storePath);
mkString(*state.allocAttr(v, state.sOutPath), storePath, PathSet({storePath}));
if (input2->getRev()) {
mkString(*state.allocAttr(v, state.symbols.create("rev")), input2->getRev()->gitRev());
mkString(*state.allocAttr(v, state.symbols.create("shortRev")), input2->getRev()->gitShortRev());
}
if (tree.info.revCount)
mkInt(*state.allocAttr(v, state.symbols.create("revCount")), *tree.info.revCount);
v.attrs->sort();
if (state.allowedPaths)
state.allowedPaths->insert(tree.actualPath);
}
static RegisterPrimOp r("fetchTree", 1, prim_fetchTree);
}