forked from lix-project/lix
slim down parser.y
most EvalState and Expr members defined here could be elsewhere, where they'd be easier to maintain (not being embedded in a file with arcane syntax) and *somewhat* more faithfully placed according to the path of the file they're defined in.
This commit is contained in:
pennae
parent
835a6c7bcf
commit
e1aa585964
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@ -20,6 +20,8 @@
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#include "gc-small-vector.hh"
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#include "url.hh"
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#include "fetch-to-store.hh"
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#include "tarball.hh"
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#include "flake/flakeref.hh"
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#include <algorithm>
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#include <chrono>
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@ -2636,6 +2638,168 @@ void EvalState::printStatistics()
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}
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SourcePath resolveExprPath(SourcePath path)
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{
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unsigned int followCount = 0, maxFollow = 1024;
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/* If `path' is a symlink, follow it. This is so that relative
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path references work. */
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while (!path.path.isRoot()) {
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// Basic cycle/depth limit to avoid infinite loops.
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if (++followCount >= maxFollow)
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throw Error("too many symbolic links encountered while traversing the path '%s'", path);
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auto p = path.parent().resolveSymlinks() + path.baseName();
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if (p.lstat().type != InputAccessor::tSymlink) break;
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path = {path.accessor, CanonPath(p.readLink(), path.path.parent().value_or(CanonPath::root))};
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}
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/* If `path' refers to a directory, append `/default.nix'. */
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if (path.resolveSymlinks().lstat().type == InputAccessor::tDirectory)
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return path + "default.nix";
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return path;
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}
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Expr * EvalState::parseExprFromFile(const SourcePath & path)
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{
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return parseExprFromFile(path, staticBaseEnv);
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}
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Expr * EvalState::parseExprFromFile(const SourcePath & path, std::shared_ptr<StaticEnv> & staticEnv)
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{
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auto buffer = path.resolveSymlinks().readFile();
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// readFile hopefully have left some extra space for terminators
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buffer.append("\0\0", 2);
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return parse(buffer.data(), buffer.size(), Pos::Origin(path), path.parent(), staticEnv);
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}
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Expr * EvalState::parseExprFromString(std::string s_, const SourcePath & basePath, std::shared_ptr<StaticEnv> & staticEnv)
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{
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auto s = make_ref<std::string>(std::move(s_));
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s->append("\0\0", 2);
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return parse(s->data(), s->size(), Pos::String{.source = s}, basePath, staticEnv);
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}
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Expr * EvalState::parseExprFromString(std::string s, const SourcePath & basePath)
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{
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return parseExprFromString(std::move(s), basePath, staticBaseEnv);
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}
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Expr * EvalState::parseStdin()
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{
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//Activity act(*logger, lvlTalkative, "parsing standard input");
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auto buffer = drainFD(0);
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// drainFD should have left some extra space for terminators
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buffer.append("\0\0", 2);
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auto s = make_ref<std::string>(std::move(buffer));
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return parse(s->data(), s->size(), Pos::Stdin{.source = s}, rootPath(CanonPath::fromCwd()), staticBaseEnv);
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}
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SourcePath EvalState::findFile(const std::string_view path)
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{
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return findFile(searchPath, path);
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}
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SourcePath EvalState::findFile(const SearchPath & searchPath, const std::string_view path, const PosIdx pos)
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{
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for (auto & i : searchPath.elements) {
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auto suffixOpt = i.prefix.suffixIfPotentialMatch(path);
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if (!suffixOpt) continue;
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auto suffix = *suffixOpt;
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auto rOpt = resolveSearchPathPath(i.path);
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if (!rOpt) continue;
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auto r = *rOpt;
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Path res = suffix == "" ? r : concatStrings(r, "/", suffix);
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if (pathExists(res)) return rootPath(CanonPath(canonPath(res)));
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}
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if (hasPrefix(path, "nix/"))
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return {corepkgsFS, CanonPath(path.substr(3))};
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debugThrow(ThrownError({
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.msg = hintfmt(evalSettings.pureEval
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? "cannot look up '<%s>' in pure evaluation mode (use '--impure' to override)"
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: "file '%s' was not found in the Nix search path (add it using $NIX_PATH or -I)",
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path),
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.errPos = positions[pos]
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}), 0, 0);
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}
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std::optional<std::string> EvalState::resolveSearchPathPath(const SearchPath::Path & value0, bool initAccessControl)
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{
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auto & value = value0.s;
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auto i = searchPathResolved.find(value);
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if (i != searchPathResolved.end()) return i->second;
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std::optional<std::string> res;
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if (EvalSettings::isPseudoUrl(value)) {
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try {
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auto storePath = fetchers::downloadTarball(
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store, EvalSettings::resolvePseudoUrl(value), "source", false).storePath;
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res = { store->toRealPath(storePath) };
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} catch (FileTransferError & e) {
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logWarning({
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.msg = hintfmt("Nix search path entry '%1%' cannot be downloaded, ignoring", value)
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});
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}
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}
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else if (hasPrefix(value, "flake:")) {
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experimentalFeatureSettings.require(Xp::Flakes);
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auto flakeRef = parseFlakeRef(value.substr(6), {}, true, false);
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debug("fetching flake search path element '%s''", value);
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auto storePath = flakeRef.resolve(store).fetchTree(store).first;
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res = { store->toRealPath(storePath) };
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}
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else {
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auto path = absPath(value);
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/* Allow access to paths in the search path. */
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if (initAccessControl) {
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allowPath(path);
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if (store->isInStore(path)) {
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try {
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StorePathSet closure;
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store->computeFSClosure(store->toStorePath(path).first, closure);
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for (auto & p : closure)
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allowPath(p);
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} catch (InvalidPath &) { }
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}
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}
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if (pathExists(path))
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res = { path };
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else {
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logWarning({
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.msg = hintfmt("Nix search path entry '%1%' does not exist, ignoring", value)
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});
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res = std::nullopt;
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}
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}
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if (res)
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debug("resolved search path element '%s' to '%s'", value, *res);
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else
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debug("failed to resolve search path element '%s'", value);
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searchPathResolved.emplace(value, res);
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return res;
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}
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std::string ExternalValueBase::coerceToString(const Pos & pos, NixStringContext & context, bool copyMore, bool copyToStore) const
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{
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throw TypeError({
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@ -9,6 +9,8 @@
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namespace nix {
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unsigned long Expr::nrExprs = 0;
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ExprBlackHole eBlackHole;
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// FIXME: remove, because *symbols* are abstract and do not have a single
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@ -389,25 +389,11 @@ formal
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%%
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include "eval.hh"
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#include "filetransfer.hh"
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#include "tarball.hh"
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#include "store-api.hh"
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#include "flake/flake.hh"
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#include "fs-input-accessor.hh"
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#include "memory-input-accessor.hh"
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namespace nix {
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unsigned long Expr::nrExprs = 0;
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Expr * EvalState::parse(
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char * text,
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size_t length,
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@ -435,166 +421,4 @@ Expr * EvalState::parse(
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}
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SourcePath resolveExprPath(SourcePath path)
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{
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unsigned int followCount = 0, maxFollow = 1024;
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/* If `path' is a symlink, follow it. This is so that relative
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path references work. */
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while (!path.path.isRoot()) {
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// Basic cycle/depth limit to avoid infinite loops.
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if (++followCount >= maxFollow)
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throw Error("too many symbolic links encountered while traversing the path '%s'", path);
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auto p = path.parent().resolveSymlinks() + path.baseName();
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if (p.lstat().type != InputAccessor::tSymlink) break;
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path = {path.accessor, CanonPath(p.readLink(), path.path.parent().value_or(CanonPath::root))};
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}
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/* If `path' refers to a directory, append `/default.nix'. */
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if (path.resolveSymlinks().lstat().type == InputAccessor::tDirectory)
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return path + "default.nix";
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return path;
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}
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Expr * EvalState::parseExprFromFile(const SourcePath & path)
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{
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return parseExprFromFile(path, staticBaseEnv);
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}
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Expr * EvalState::parseExprFromFile(const SourcePath & path, std::shared_ptr<StaticEnv> & staticEnv)
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{
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auto buffer = path.resolveSymlinks().readFile();
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// readFile hopefully have left some extra space for terminators
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buffer.append("\0\0", 2);
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return parse(buffer.data(), buffer.size(), Pos::Origin(path), path.parent(), staticEnv);
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}
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Expr * EvalState::parseExprFromString(std::string s_, const SourcePath & basePath, std::shared_ptr<StaticEnv> & staticEnv)
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{
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auto s = make_ref<std::string>(std::move(s_));
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s->append("\0\0", 2);
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return parse(s->data(), s->size(), Pos::String{.source = s}, basePath, staticEnv);
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}
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Expr * EvalState::parseExprFromString(std::string s, const SourcePath & basePath)
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{
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return parseExprFromString(std::move(s), basePath, staticBaseEnv);
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}
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Expr * EvalState::parseStdin()
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{
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//Activity act(*logger, lvlTalkative, "parsing standard input");
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auto buffer = drainFD(0);
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// drainFD should have left some extra space for terminators
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buffer.append("\0\0", 2);
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auto s = make_ref<std::string>(std::move(buffer));
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return parse(s->data(), s->size(), Pos::Stdin{.source = s}, rootPath(CanonPath::fromCwd()), staticBaseEnv);
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}
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SourcePath EvalState::findFile(const std::string_view path)
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{
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return findFile(searchPath, path);
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}
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SourcePath EvalState::findFile(const SearchPath & searchPath, const std::string_view path, const PosIdx pos)
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{
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for (auto & i : searchPath.elements) {
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auto suffixOpt = i.prefix.suffixIfPotentialMatch(path);
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if (!suffixOpt) continue;
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auto suffix = *suffixOpt;
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auto rOpt = resolveSearchPathPath(i.path);
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if (!rOpt) continue;
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auto r = *rOpt;
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Path res = suffix == "" ? r : concatStrings(r, "/", suffix);
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if (pathExists(res)) return rootPath(CanonPath(canonPath(res)));
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}
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if (hasPrefix(path, "nix/"))
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return {corepkgsFS, CanonPath(path.substr(3))};
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debugThrow(ThrownError({
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.msg = hintfmt(evalSettings.pureEval
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? "cannot look up '<%s>' in pure evaluation mode (use '--impure' to override)"
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: "file '%s' was not found in the Nix search path (add it using $NIX_PATH or -I)",
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path),
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.errPos = positions[pos]
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}), 0, 0);
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}
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std::optional<std::string> EvalState::resolveSearchPathPath(const SearchPath::Path & value0, bool initAccessControl)
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{
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auto & value = value0.s;
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auto i = searchPathResolved.find(value);
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if (i != searchPathResolved.end()) return i->second;
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std::optional<std::string> res;
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if (EvalSettings::isPseudoUrl(value)) {
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try {
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auto storePath = fetchers::downloadTarball(
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store, EvalSettings::resolvePseudoUrl(value), "source", false).storePath;
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res = { store->toRealPath(storePath) };
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} catch (FileTransferError & e) {
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logWarning({
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.msg = hintfmt("Nix search path entry '%1%' cannot be downloaded, ignoring", value)
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});
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}
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}
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else if (hasPrefix(value, "flake:")) {
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experimentalFeatureSettings.require(Xp::Flakes);
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auto flakeRef = parseFlakeRef(value.substr(6), {}, true, false);
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debug("fetching flake search path element '%s''", value);
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auto storePath = flakeRef.resolve(store).fetchTree(store).first;
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res = { store->toRealPath(storePath) };
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}
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else {
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auto path = absPath(value);
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/* Allow access to paths in the search path. */
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if (initAccessControl) {
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allowPath(path);
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if (store->isInStore(path)) {
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try {
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StorePathSet closure;
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store->computeFSClosure(store->toStorePath(path).first, closure);
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for (auto & p : closure)
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allowPath(p);
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} catch (InvalidPath &) { }
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}
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}
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if (pathExists(path))
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res = { path };
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else {
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logWarning({
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.msg = hintfmt("Nix search path entry '%1%' does not exist, ignoring", value)
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});
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res = std::nullopt;
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}
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}
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if (res)
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debug("resolved search path element '%s' to '%s'", value, *res);
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else
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debug("failed to resolve search path element '%s'", value);
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searchPathResolved.emplace(value, res);
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return res;
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}
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}
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