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Move /src to /subprojects
This will facilitate breaking up Nix into multiple packages for each component with Meson.
This commit is contained in:
John Ericson
parent
4db9487823
commit
84e2963f8e
737 changed files with 504 additions and 505 deletions
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#include "primops.hh"
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#include "store-api.hh"
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#include "realisation.hh"
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#include "make-content-addressed.hh"
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#include "url.hh"
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namespace nix {
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/**
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* Handler for the content addressed case.
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*
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* @param state Evaluator state and store to write to.
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* @param fromStore Store containing the path to rewrite.
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* @param fromPath Source path to be rewritten.
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* @param toPathMaybe Path to write the rewritten path to. If empty, the error shows the actual path.
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* @param v Return `Value`
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*/
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static void runFetchClosureWithRewrite(EvalState & state, const PosIdx pos, Store & fromStore, const StorePath & fromPath, const std::optional<StorePath> & toPathMaybe, Value &v) {
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// establish toPath or throw
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if (!toPathMaybe || !state.store->isValidPath(*toPathMaybe)) {
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auto rewrittenPath = makeContentAddressed(fromStore, *state.store, fromPath);
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if (toPathMaybe && *toPathMaybe != rewrittenPath)
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throw Error({
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.msg = HintFmt("rewriting '%s' to content-addressed form yielded '%s', while '%s' was expected",
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state.store->printStorePath(fromPath),
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state.store->printStorePath(rewrittenPath),
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state.store->printStorePath(*toPathMaybe)),
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.pos = state.positions[pos]
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});
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if (!toPathMaybe)
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throw Error({
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.msg = HintFmt(
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"rewriting '%s' to content-addressed form yielded '%s'\n"
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"Use this value for the 'toPath' attribute passed to 'fetchClosure'",
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state.store->printStorePath(fromPath),
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state.store->printStorePath(rewrittenPath)),
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.pos = state.positions[pos]
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});
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}
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auto toPath = *toPathMaybe;
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// check and return
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auto resultInfo = state.store->queryPathInfo(toPath);
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if (!resultInfo->isContentAddressed(*state.store)) {
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// We don't perform the rewriting when outPath already exists, as an optimisation.
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// However, we can quickly detect a mistake if the toPath is input addressed.
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throw Error({
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.msg = HintFmt(
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"The 'toPath' value '%s' is input-addressed, so it can't possibly be the result of rewriting to a content-addressed path.\n\n"
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"Set 'toPath' to an empty string to make Nix report the correct content-addressed path.",
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state.store->printStorePath(toPath)),
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.pos = state.positions[pos]
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});
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}
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state.mkStorePathString(toPath, v);
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}
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/**
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* Fetch the closure and make sure it's content addressed.
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*/
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static void runFetchClosureWithContentAddressedPath(EvalState & state, const PosIdx pos, Store & fromStore, const StorePath & fromPath, Value & v) {
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if (!state.store->isValidPath(fromPath))
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copyClosure(fromStore, *state.store, RealisedPath::Set { fromPath });
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auto info = state.store->queryPathInfo(fromPath);
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if (!info->isContentAddressed(*state.store)) {
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throw Error({
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.msg = HintFmt(
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"The 'fromPath' value '%s' is input-addressed, but 'inputAddressed' is set to 'false' (default).\n\n"
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"If you do intend to fetch an input-addressed store path, add\n\n"
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" inputAddressed = true;\n\n"
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"to the 'fetchClosure' arguments.\n\n"
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"Note that to ensure authenticity input-addressed store paths, users must configure a trusted binary cache public key on their systems. This is not needed for content-addressed paths.",
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state.store->printStorePath(fromPath)),
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.pos = state.positions[pos]
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});
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}
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state.mkStorePathString(fromPath, v);
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}
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/**
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* Fetch the closure and make sure it's input addressed.
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*/
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static void runFetchClosureWithInputAddressedPath(EvalState & state, const PosIdx pos, Store & fromStore, const StorePath & fromPath, Value & v) {
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if (!state.store->isValidPath(fromPath))
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copyClosure(fromStore, *state.store, RealisedPath::Set { fromPath });
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auto info = state.store->queryPathInfo(fromPath);
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if (info->isContentAddressed(*state.store)) {
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throw Error({
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.msg = HintFmt(
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"The store object referred to by 'fromPath' at '%s' is not input-addressed, but 'inputAddressed' is set to 'true'.\n\n"
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"Remove the 'inputAddressed' attribute (it defaults to 'false') to expect 'fromPath' to be content-addressed",
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state.store->printStorePath(fromPath)),
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.pos = state.positions[pos]
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});
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}
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state.mkStorePathString(fromPath, v);
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}
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typedef std::optional<StorePath> StorePathOrGap;
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static void prim_fetchClosure(EvalState & state, const PosIdx pos, Value * * args, Value & v)
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{
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state.forceAttrs(*args[0], pos, "while evaluating the argument passed to builtins.fetchClosure");
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std::optional<std::string> fromStoreUrl;
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std::optional<StorePath> fromPath;
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std::optional<StorePathOrGap> toPath;
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std::optional<bool> inputAddressedMaybe;
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for (auto & attr : *args[0]->attrs()) {
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const auto & attrName = state.symbols[attr.name];
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auto attrHint = [&]() -> std::string {
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return "while evaluating the '" + attrName + "' attribute passed to builtins.fetchClosure";
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};
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if (attrName == "fromPath") {
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NixStringContext context;
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fromPath = state.coerceToStorePath(attr.pos, *attr.value, context, attrHint());
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}
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else if (attrName == "toPath") {
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state.forceValue(*attr.value, attr.pos);
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bool isEmptyString = attr.value->type() == nString && attr.value->string_view() == "";
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if (isEmptyString) {
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toPath = StorePathOrGap {};
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}
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else {
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NixStringContext context;
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toPath = state.coerceToStorePath(attr.pos, *attr.value, context, attrHint());
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}
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}
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else if (attrName == "fromStore")
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fromStoreUrl = state.forceStringNoCtx(*attr.value, attr.pos,
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attrHint());
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else if (attrName == "inputAddressed")
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inputAddressedMaybe = state.forceBool(*attr.value, attr.pos, attrHint());
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else
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throw Error({
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.msg = HintFmt("attribute '%s' isn't supported in call to 'fetchClosure'", attrName),
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.pos = state.positions[pos]
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});
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}
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if (!fromPath)
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throw Error({
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.msg = HintFmt("attribute '%s' is missing in call to 'fetchClosure'", "fromPath"),
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.pos = state.positions[pos]
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});
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bool inputAddressed = inputAddressedMaybe.value_or(false);
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if (inputAddressed) {
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if (toPath)
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throw Error({
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.msg = HintFmt("attribute '%s' is set to true, but '%s' is also set. Please remove one of them",
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"inputAddressed",
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"toPath"),
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.pos = state.positions[pos]
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});
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}
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if (!fromStoreUrl)
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throw Error({
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.msg = HintFmt("attribute '%s' is missing in call to 'fetchClosure'", "fromStore"),
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.pos = state.positions[pos]
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});
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auto parsedURL = parseURL(*fromStoreUrl);
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if (parsedURL.scheme != "http" &&
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parsedURL.scheme != "https" &&
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!(getEnv("_NIX_IN_TEST").has_value() && parsedURL.scheme == "file"))
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throw Error({
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.msg = HintFmt("'fetchClosure' only supports http:// and https:// stores"),
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.pos = state.positions[pos]
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});
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if (!parsedURL.query.empty())
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throw Error({
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.msg = HintFmt("'fetchClosure' does not support URL query parameters (in '%s')", *fromStoreUrl),
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.pos = state.positions[pos]
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});
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auto fromStore = openStore(parsedURL.to_string());
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if (toPath)
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runFetchClosureWithRewrite(state, pos, *fromStore, *fromPath, *toPath, v);
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else if (inputAddressed)
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runFetchClosureWithInputAddressedPath(state, pos, *fromStore, *fromPath, v);
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else
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runFetchClosureWithContentAddressedPath(state, pos, *fromStore, *fromPath, v);
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}
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static RegisterPrimOp primop_fetchClosure({
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.name = "__fetchClosure",
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.args = {"args"},
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.doc = R"(
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Fetch a store path [closure](@docroot@/glossary.md#gloss-closure) from a binary cache, and return the store path as a string with context.
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This function can be invoked in three ways, that we will discuss in order of preference.
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**Fetch a content-addressed store path**
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Example:
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```nix
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builtins.fetchClosure {
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fromStore = "https://cache.nixos.org";
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fromPath = /nix/store/ldbhlwhh39wha58rm61bkiiwm6j7211j-git-2.33.1;
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}
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```
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This is the simplest invocation, and it does not require the user of the expression to configure [`trusted-public-keys`](@docroot@/command-ref/conf-file.md#conf-trusted-public-keys) to ensure their authenticity.
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If your store path is [input addressed](@docroot@/glossary.md#gloss-input-addressed-store-object) instead of content addressed, consider the other two invocations.
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**Fetch any store path and rewrite it to a fully content-addressed store path**
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Example:
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```nix
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builtins.fetchClosure {
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fromStore = "https://cache.nixos.org";
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fromPath = /nix/store/r2jd6ygnmirm2g803mksqqjm4y39yi6i-git-2.33.1;
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toPath = /nix/store/ldbhlwhh39wha58rm61bkiiwm6j7211j-git-2.33.1;
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}
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```
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This example fetches `/nix/store/r2jd...` from the specified binary cache,
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and rewrites it into the content-addressed store path
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`/nix/store/ldbh...`.
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Like the previous example, no extra configuration or privileges are required.
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To find out the correct value for `toPath` given a `fromPath`,
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use [`nix store make-content-addressed`](@docroot@/command-ref/new-cli/nix3-store-make-content-addressed.md):
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```console
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# nix store make-content-addressed --from https://cache.nixos.org /nix/store/r2jd6ygnmirm2g803mksqqjm4y39yi6i-git-2.33.1
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rewrote '/nix/store/r2jd6ygnmirm2g803mksqqjm4y39yi6i-git-2.33.1' to '/nix/store/ldbhlwhh39wha58rm61bkiiwm6j7211j-git-2.33.1'
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```
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Alternatively, set `toPath = ""` and find the correct `toPath` in the error message.
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**Fetch an input-addressed store path as is**
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Example:
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```nix
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builtins.fetchClosure {
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fromStore = "https://cache.nixos.org";
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fromPath = /nix/store/r2jd6ygnmirm2g803mksqqjm4y39yi6i-git-2.33.1;
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inputAddressed = true;
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}
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```
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It is possible to fetch an [input-addressed store path](@docroot@/glossary.md#gloss-input-addressed-store-object) and return it as is.
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However, this is the least preferred way of invoking `fetchClosure`, because it requires that the input-addressed paths are trusted by the Nix configuration.
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**`builtins.storePath`**
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`fetchClosure` is similar to [`builtins.storePath`](#builtins-storePath) in that it allows you to use a previously built store path in a Nix expression.
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However, `fetchClosure` is more reproducible because it specifies a binary cache from which the path can be fetched.
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Also, using content-addressed store paths does not require users to configure [`trusted-public-keys`](@docroot@/command-ref/conf-file.md#conf-trusted-public-keys) to ensure their authenticity.
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)",
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.fun = prim_fetchClosure,
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.experimentalFeature = Xp::FetchClosure,
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});
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}
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