diff options
Diffstat (limited to 'third_party/nix/src/libexpr/primops')
| -rw-r--r-- | third_party/nix/src/libexpr/primops/context.cc | 202 | ||||
| -rw-r--r-- | third_party/nix/src/libexpr/primops/fetchGit.cc | 277 | ||||
| -rw-r--r-- | third_party/nix/src/libexpr/primops/fetchMercurial.cc | 246 | ||||
| -rw-r--r-- | third_party/nix/src/libexpr/primops/fromTOML.cc | 94 |
4 files changed, 819 insertions, 0 deletions
diff --git a/third_party/nix/src/libexpr/primops/context.cc b/third_party/nix/src/libexpr/primops/context.cc new file mode 100644 index 000000000000..fb8879ead16d --- /dev/null +++ b/third_party/nix/src/libexpr/primops/context.cc @@ -0,0 +1,202 @@ +#include "libexpr/eval-inline.hh" +#include "libexpr/primops.hh" +#include "libstore/derivations.hh" + +namespace nix { + +static void prim_unsafeDiscardStringContext(EvalState& state, const Pos& pos, + Value** args, Value& v) { + PathSet context; + std::string s = state.coerceToString(pos, *args[0], context); + mkString(v, s, PathSet()); +} + +static RegisterPrimOp r1("__unsafeDiscardStringContext", 1, + prim_unsafeDiscardStringContext); + +static void prim_hasContext(EvalState& state, const Pos& pos, Value** args, + Value& v) { + PathSet context; + state.forceString(*args[0], context, pos); + mkBool(v, !context.empty()); +} + +static RegisterPrimOp r2("__hasContext", 1, prim_hasContext); + +/* Sometimes we want to pass a derivation path (i.e. pkg.drvPath) to a + builder without causing the derivation to be built (for instance, + in the derivation that builds NARs in nix-push, when doing + source-only deployment). This primop marks the string context so + that builtins.derivation adds the path to drv.inputSrcs rather than + drv.inputDrvs. */ +static void prim_unsafeDiscardOutputDependency(EvalState& state, const Pos& pos, + Value** args, Value& v) { + PathSet context; + std::string s = state.coerceToString(pos, *args[0], context); + + PathSet context2; + for (auto& p : context) { + context2.insert(p.at(0) == '=' ? std::string(p, 1) : p); + } + + mkString(v, s, context2); +} + +static RegisterPrimOp r3("__unsafeDiscardOutputDependency", 1, + prim_unsafeDiscardOutputDependency); + +/* Extract the context of a string as a structured Nix value. + + The context is represented as an attribute set whose keys are the + paths in the context set and whose values are attribute sets with + the following keys: + path: True if the relevant path is in the context as a plain store + path (i.e. the kind of context you get when interpolating + a Nix path (e.g. ./.) into a string). False if missing. + allOutputs: True if the relevant path is a derivation and it is + in the context as a drv file with all of its outputs + (i.e. the kind of context you get when referencing + .drvPath of some derivation). False if missing. + outputs: If a non-empty list, the relevant path is a derivation + and the provided outputs are referenced in the context + (i.e. the kind of context you get when referencing + .outPath of some derivation). Empty list if missing. + Note that for a given path any combination of the above attributes + may be present. +*/ +static void prim_getContext(EvalState& state, const Pos& pos, Value** args, + Value& v) { + struct ContextInfo { + bool path = false; + bool allOutputs = false; + Strings outputs; + }; + PathSet context; + state.forceString(*args[0], context, pos); + auto contextInfos = std::map<Path, ContextInfo>(); + for (const auto& p : context) { + Path drv; + std::string output; + const Path* path = &p; + if (p.at(0) == '=') { + drv = std::string(p, 1); + path = &drv; + } else if (p.at(0) == '!') { + std::pair<std::string, std::string> ctx = decodeContext(p); + drv = ctx.first; + output = ctx.second; + path = &drv; + } + auto isPath = drv.empty(); + auto isAllOutputs = (!drv.empty()) && output.empty(); + + auto iter = contextInfos.find(*path); + if (iter == contextInfos.end()) { + contextInfos.emplace( + *path, + ContextInfo{isPath, isAllOutputs, + output.empty() ? Strings{} : Strings{std::move(output)}}); + } else { + if (isPath) { + iter->second.path = true; + } else if (isAllOutputs) { + iter->second.allOutputs = true; + } else { + iter->second.outputs.emplace_back(std::move(output)); + } + } + } + + state.mkAttrs(v, contextInfos.size()); + + auto sPath = state.symbols.Create("path"); + auto sAllOutputs = state.symbols.Create("allOutputs"); + for (const auto& info : contextInfos) { + auto& infoVal = *state.allocAttr(v, state.symbols.Create(info.first)); + state.mkAttrs(infoVal, 3); + if (info.second.path) { + mkBool(*state.allocAttr(infoVal, sPath), true); + } + if (info.second.allOutputs) { + mkBool(*state.allocAttr(infoVal, sAllOutputs), true); + } + if (!info.second.outputs.empty()) { + auto& outputsVal = *state.allocAttr(infoVal, state.sOutputs); + state.mkList(outputsVal, info.second.outputs.size()); + size_t i = 0; + for (const auto& output : info.second.outputs) { + mkString(*((*outputsVal.list)[i++] = state.allocValue()), output); + } + } + } +} + +static RegisterPrimOp r4("__getContext", 1, prim_getContext); + +/* Append the given context to a given string. + + See the commentary above unsafeGetContext for details of the + context representation. +*/ +static void prim_appendContext(EvalState& state, const Pos& pos, Value** args, + Value& v) { + PathSet context; + auto orig = state.forceString(*args[0], context, pos); + + state.forceAttrs(*args[1], pos); + + auto sPath = state.symbols.Create("path"); + auto sAllOutputs = state.symbols.Create("allOutputs"); + for (const auto& attr_iter : *args[1]->attrs) { + const Attr* i = &attr_iter.second; // TODO(tazjin): get rid of this + if (!state.store->isStorePath(i->name)) { + throw EvalError("Context key '%s' is not a store path, at %s", i->name, + i->pos); + } + if (!settings.readOnlyMode) { + state.store->ensurePath(i->name); + } + state.forceAttrs(*i->value, *i->pos); + auto iter = i->value->attrs->find(sPath); + if (iter != i->value->attrs->end()) { + if (state.forceBool(*iter->second.value, *iter->second.pos)) { + context.insert(i->name); + } + } + + iter = i->value->attrs->find(sAllOutputs); + if (iter != i->value->attrs->end()) { + if (state.forceBool(*iter->second.value, *iter->second.pos)) { + if (!isDerivation(i->name)) { + throw EvalError( + "Tried to add all-outputs context of %s, which is not a " + "derivation, to a string, at %s", + i->name, i->pos); + } + context.insert("=" + std::string(i->name)); + } + } + + iter = i->value->attrs->find(state.sOutputs); + if (iter != i->value->attrs->end()) { + state.forceList(*iter->second.value, *iter->second.pos); + if (iter->second.value->listSize() && !isDerivation(i->name)) { + throw EvalError( + "Tried to add derivation output context of %s, which is not a " + "derivation, to a string, at %s", + i->name, i->pos); + } + for (unsigned int n = 0; n < iter->second.value->listSize(); ++n) { + auto name = state.forceStringNoCtx(*(*iter->second.value->list)[n], + *iter->second.pos); + context.insert("!" + name + "!" + std::string(i->name)); + } + } + } + + mkString(v, orig, context); +} + +static RegisterPrimOp r5("__appendContext", 2, prim_appendContext); + +} // namespace nix diff --git a/third_party/nix/src/libexpr/primops/fetchGit.cc b/third_party/nix/src/libexpr/primops/fetchGit.cc new file mode 100644 index 000000000000..da4d683401d7 --- /dev/null +++ b/third_party/nix/src/libexpr/primops/fetchGit.cc @@ -0,0 +1,277 @@ +#include <nlohmann/json.hpp> +#include <regex> + +#include <absl/strings/ascii.h> +#include <absl/strings/match.h> +#include <absl/strings/str_split.h> +#include <glog/logging.h> +#include <sys/time.h> + +#include "libexpr/eval-inline.hh" +#include "libexpr/primops.hh" +#include "libstore/download.hh" +#include "libstore/pathlocks.hh" +#include "libstore/store-api.hh" +#include "libutil/hash.hh" + +using namespace std::string_literals; + +namespace nix { + +struct GitInfo { + Path storePath; + std::string rev; + std::string shortRev; + uint64_t revCount = 0; +}; + +std::regex revRegex("^[0-9a-fA-F]{40}$"); + +GitInfo exportGit(ref<Store> store, const std::string& uri, + std::optional<std::string> ref, std::string rev, + const std::string& name) { + if (evalSettings.pureEval && rev == "") { + throw Error("in pure evaluation mode, 'fetchGit' requires a Git revision"); + } + + if (!ref && rev == "" && absl::StartsWith(uri, "/") && + pathExists(uri + "/.git")) { + bool clean = true; + + try { + runProgram("git", true, + {"-C", uri, "diff-index", "--quiet", "HEAD", "--"}); + } catch (ExecError& e) { + if (!WIFEXITED(e.status) || WEXITSTATUS(e.status) != 1) { + throw; + } + clean = false; + } + + if (!clean) { + /* This is an unclean working tree. So copy all tracked + files. */ + + GitInfo gitInfo; + gitInfo.rev = "0000000000000000000000000000000000000000"; + gitInfo.shortRev = std::string(gitInfo.rev, 0, 7); + + std::set<std::string> files = + absl::StrSplit(runProgram("git", true, {"-C", uri, "ls-files", "-z"}), + absl::ByChar('\0'), absl::SkipEmpty()); + + PathFilter filter = [&](const Path& p) -> bool { + assert(absl::StartsWith(p, uri)); + std::string file(p, uri.size() + 1); + + auto st = lstat(p); + + if (S_ISDIR(st.st_mode)) { + auto prefix = file + "/"; + auto i = files.lower_bound(prefix); + return i != files.end() && absl::StartsWith(*i, prefix); + } + + return files.count(file); + }; + + gitInfo.storePath = + store->addToStore("source", uri, true, htSHA256, filter); + + return gitInfo; + } + + // clean working tree, but no ref or rev specified. Use 'HEAD'. + rev = absl::StripTrailingAsciiWhitespace( + runProgram("git", true, {"-C", uri, "rev-parse", "HEAD"})); + ref = "HEAD"s; + } + + if (!ref) { + ref = "HEAD"s; + } + + if (rev != "" && !std::regex_match(rev, revRegex)) { + throw Error("invalid Git revision '%s'", rev); + } + + deletePath(getCacheDir() + "/nix/git"); + + Path cacheDir = getCacheDir() + "/nix/gitv2/" + + hashString(htSHA256, uri).to_string(Base32, false); + + if (!pathExists(cacheDir)) { + createDirs(dirOf(cacheDir)); + runProgram("git", true, {"init", "--bare", cacheDir}); + } + + Path localRefFile; + if (ref->compare(0, 5, "refs/") == 0) { + localRefFile = cacheDir + "/" + *ref; + } else { + localRefFile = cacheDir + "/refs/heads/" + *ref; + } + + bool doFetch; + time_t now = time(0); + /* If a rev was specified, we need to fetch if it's not in the + repo. */ + if (rev != "") { + try { + runProgram("git", true, {"-C", cacheDir, "cat-file", "-e", rev}); + doFetch = false; + } catch (ExecError& e) { + if (WIFEXITED(e.status)) { + doFetch = true; + } else { + throw; + } + } + } else { + /* If the local ref is older than ‘tarball-ttl’ seconds, do a + git fetch to update the local ref to the remote ref. */ + struct stat st; + doFetch = stat(localRefFile.c_str(), &st) != 0 || + static_cast<uint64_t>(st.st_mtime) + settings.tarballTtl <= + static_cast<uint64_t>(now); + } + if (doFetch) { + DLOG(INFO) << "fetching Git repository '" << uri << "'"; + + // FIXME: git stderr messes up our progress indicator, so + // we're using --quiet for now. Should process its stderr. + runProgram("git", true, + {"-C", cacheDir, "fetch", "--quiet", "--force", "--", uri, + fmt("%s:%s", *ref, *ref)}); + + struct timeval times[2]; + times[0].tv_sec = now; + times[0].tv_usec = 0; + times[1].tv_sec = now; + times[1].tv_usec = 0; + + utimes(localRefFile.c_str(), times); + } + + // FIXME: check whether rev is an ancestor of ref. + GitInfo gitInfo; + gitInfo.rev = + rev != "" ? rev + : absl::StripTrailingAsciiWhitespace(readFile(localRefFile)); + gitInfo.shortRev = std::string(gitInfo.rev, 0, 7); + + VLOG(2) << "using revision " << gitInfo.rev << " of repo '" << uri << "'"; + + std::string storeLinkName = + hashString(htSHA512, name + std::string("\0"s) + gitInfo.rev) + .to_string(Base32, false); + Path storeLink = cacheDir + "/" + storeLinkName + ".link"; + PathLocks storeLinkLock({storeLink}, fmt("waiting for lock on '%1%'...", + storeLink)); // FIXME: broken + + try { + auto json = nlohmann::json::parse(readFile(storeLink)); + + assert(json["name"] == name && json["rev"] == gitInfo.rev); + + gitInfo.storePath = json["storePath"]; + + if (store->isValidPath(gitInfo.storePath)) { + gitInfo.revCount = json["revCount"]; + return gitInfo; + } + + } catch (SysError& e) { + if (e.errNo != ENOENT) { + throw; + } + } + + // FIXME: should pipe this, or find some better way to extract a + // revision. + auto tar = runProgram("git", true, {"-C", cacheDir, "archive", gitInfo.rev}); + + Path tmpDir = createTempDir(); + AutoDelete delTmpDir(tmpDir, true); + + runProgram("tar", true, {"x", "-C", tmpDir}, tar); + + gitInfo.storePath = store->addToStore(name, tmpDir); + + gitInfo.revCount = std::stoull(runProgram( + "git", true, {"-C", cacheDir, "rev-list", "--count", gitInfo.rev})); + + nlohmann::json json; + json["storePath"] = gitInfo.storePath; + json["uri"] = uri; + json["name"] = name; + json["rev"] = gitInfo.rev; + json["revCount"] = gitInfo.revCount; + + writeFile(storeLink, json.dump()); + + return gitInfo; +} + +static void prim_fetchGit(EvalState& state, const Pos& pos, Value** args, + Value& v) { + std::string url; + std::optional<std::string> ref; + std::string rev; + std::string name = "source"; + PathSet context; + + state.forceValue(*args[0]); + + if (args[0]->type == tAttrs) { + state.forceAttrs(*args[0], pos); + + for (auto& attr_iter : *args[0]->attrs) { + auto& attr = attr_iter.second; + std::string n(attr.name); + if (n == "url") { + url = + state.coerceToString(*attr.pos, *attr.value, context, false, false); + } else if (n == "ref") { + ref = state.forceStringNoCtx(*attr.value, *attr.pos); + } else if (n == "rev") { + rev = state.forceStringNoCtx(*attr.value, *attr.pos); + } else if (n == "name") { + name = state.forceStringNoCtx(*attr.value, *attr.pos); + } else { + throw EvalError("unsupported argument '%s' to 'fetchGit', at %s", + attr.name, *attr.pos); + } + } + + if (url.empty()) { + throw EvalError(format("'url' argument required, at %1%") % pos); + } + + } else { + url = state.coerceToString(pos, *args[0], context, false, false); + } + + // FIXME: git externals probably can be used to bypass the URI + // whitelist. Ah well. + state.checkURI(url); + + auto gitInfo = exportGit(state.store, url, ref, rev, name); + + state.mkAttrs(v, 8); + mkString(*state.allocAttr(v, state.sOutPath), gitInfo.storePath, + PathSet({gitInfo.storePath})); + mkString(*state.allocAttr(v, state.symbols.Create("rev")), gitInfo.rev); + mkString(*state.allocAttr(v, state.symbols.Create("shortRev")), + gitInfo.shortRev); + mkInt(*state.allocAttr(v, state.symbols.Create("revCount")), + gitInfo.revCount); + + if (state.allowedPaths) { + state.allowedPaths->insert(state.store->toRealPath(gitInfo.storePath)); + } +} + +static RegisterPrimOp r("fetchGit", 1, prim_fetchGit); + +} // namespace nix diff --git a/third_party/nix/src/libexpr/primops/fetchMercurial.cc b/third_party/nix/src/libexpr/primops/fetchMercurial.cc new file mode 100644 index 000000000000..13dc61766fe0 --- /dev/null +++ b/third_party/nix/src/libexpr/primops/fetchMercurial.cc @@ -0,0 +1,246 @@ +#include <nlohmann/json.hpp> +#include <regex> + +#include <absl/strings/ascii.h> +#include <absl/strings/match.h> +#include <absl/strings/str_split.h> +#include <glog/logging.h> +#include <sys/time.h> + +#include "libexpr/eval-inline.hh" +#include "libexpr/primops.hh" +#include "libstore/download.hh" +#include "libstore/pathlocks.hh" +#include "libstore/store-api.hh" + +using namespace std::string_literals; + +namespace nix { + +struct HgInfo { + Path storePath; + std::string branch; + std::string rev; + uint64_t revCount = 0; +}; + +std::regex commitHashRegex("^[0-9a-fA-F]{40}$"); + +HgInfo exportMercurial(ref<Store> store, const std::string& uri, + std::string rev, const std::string& name) { + if (evalSettings.pureEval && rev == "") { + throw Error( + "in pure evaluation mode, 'fetchMercurial' requires a Mercurial " + "revision"); + } + + if (rev == "" && absl::StartsWith(uri, "/") && pathExists(uri + "/.hg")) { + bool clean = runProgram("hg", true, + {"status", "-R", uri, "--modified", "--added", + "--removed"}) == ""; + + if (!clean) { + /* This is an unclean working tree. So copy all tracked + files. */ + + DLOG(INFO) << "copying unclean Mercurial working tree '" << uri << "'"; + + HgInfo hgInfo; + hgInfo.rev = "0000000000000000000000000000000000000000"; + hgInfo.branch = absl::StripTrailingAsciiWhitespace( + runProgram("hg", true, {"branch", "-R", uri})); + + std::set<std::string> files = absl::StrSplit( + runProgram("hg", true, + {"status", "-R", uri, "--clean", "--modified", "--added", + "--no-status", "--print0"}), + absl::ByChar('\0'), absl::SkipEmpty()); + + PathFilter filter = [&](const Path& p) -> bool { + assert(absl::StartsWith(p, uri)); + std::string file(p, uri.size() + 1); + + auto st = lstat(p); + + if (S_ISDIR(st.st_mode)) { + auto prefix = file + "/"; + auto i = files.lower_bound(prefix); + return i != files.end() && absl::StartsWith(*i, prefix); + } + + return files.count(file); + }; + + hgInfo.storePath = + store->addToStore("source", uri, true, htSHA256, filter); + + return hgInfo; + } + } + + if (rev == "") { + rev = "default"; + } + + Path cacheDir = fmt("%s/nix/hg/%s", getCacheDir(), + hashString(htSHA256, uri).to_string(Base32, false)); + + Path stampFile = fmt("%s/.hg/%s.stamp", cacheDir, + hashString(htSHA512, rev).to_string(Base32, false)); + + /* If we haven't pulled this repo less than ‘tarball-ttl’ seconds, + do so now. */ + time_t now = time(0); + struct stat st; + if (stat(stampFile.c_str(), &st) != 0 || + static_cast<uint64_t>(st.st_mtime) + settings.tarballTtl <= + static_cast<uint64_t>(now)) { + /* Except that if this is a commit hash that we already have, + we don't have to pull again. */ + if (!(std::regex_match(rev, commitHashRegex) && pathExists(cacheDir) && + runProgram(RunOptions("hg", {"log", "-R", cacheDir, "-r", rev, + "--template", "1"}) + .killStderr(true)) + .second == "1")) { + DLOG(INFO) << "fetching Mercurial repository '" << uri << "'"; + + if (pathExists(cacheDir)) { + try { + runProgram("hg", true, {"pull", "-R", cacheDir, "--", uri}); + } catch (ExecError& e) { + std::string transJournal = cacheDir + "/.hg/store/journal"; + /* hg throws "abandoned transaction" error only if this file exists */ + if (pathExists(transJournal)) { + runProgram("hg", true, {"recover", "-R", cacheDir}); + runProgram("hg", true, {"pull", "-R", cacheDir, "--", uri}); + } else { + throw ExecError(e.status, + fmt("'hg pull' %s", statusToString(e.status))); + } + } + } else { + createDirs(dirOf(cacheDir)); + runProgram("hg", true, {"clone", "--noupdate", "--", uri, cacheDir}); + } + } + + writeFile(stampFile, ""); + } + + std::vector<std::string> tokens = + absl::StrSplit(runProgram("hg", true, + {"log", "-R", cacheDir, "-r", rev, "--template", + "{node} {rev} {branch}"}), + absl::ByAnyChar(" \t\n\r"), absl::SkipEmpty()); + assert(tokens.size() == 3); + + HgInfo hgInfo; + hgInfo.rev = tokens[0]; + hgInfo.revCount = std::stoull(tokens[1]); + hgInfo.branch = tokens[2]; + + std::string storeLinkName = + hashString(htSHA512, name + std::string("\0"s) + hgInfo.rev) + .to_string(Base32, false); + Path storeLink = fmt("%s/.hg/%s.link", cacheDir, storeLinkName); + + try { + auto json = nlohmann::json::parse(readFile(storeLink)); + + assert(json["name"] == name && json["rev"] == hgInfo.rev); + + hgInfo.storePath = json["storePath"]; + + if (store->isValidPath(hgInfo.storePath)) { + DLOG(INFO) << "using cached Mercurial store path '" << hgInfo.storePath + << "'"; + return hgInfo; + } + + } catch (SysError& e) { + if (e.errNo != ENOENT) { + throw; + } + } + + Path tmpDir = createTempDir(); + AutoDelete delTmpDir(tmpDir, true); + + runProgram("hg", true, {"archive", "-R", cacheDir, "-r", rev, tmpDir}); + + deletePath(tmpDir + "/.hg_archival.txt"); + + hgInfo.storePath = store->addToStore(name, tmpDir); + + nlohmann::json json; + json["storePath"] = hgInfo.storePath; + json["uri"] = uri; + json["name"] = name; + json["branch"] = hgInfo.branch; + json["rev"] = hgInfo.rev; + json["revCount"] = hgInfo.revCount; + + writeFile(storeLink, json.dump()); + + return hgInfo; +} + +static void prim_fetchMercurial(EvalState& state, const Pos& pos, Value** args, + Value& v) { + std::string url; + std::string rev; + std::string name = "source"; + PathSet context; + + state.forceValue(*args[0]); + + if (args[0]->type == tAttrs) { + state.forceAttrs(*args[0], pos); + + for (auto& attr_iter : *args[0]->attrs) { + auto& attr = attr_iter.second; + std::string n(attr.name); + if (n == "url") { + url = + state.coerceToString(*attr.pos, *attr.value, context, false, false); + } else if (n == "rev") { + rev = state.forceStringNoCtx(*attr.value, *attr.pos); + } else if (n == "name") { + name = state.forceStringNoCtx(*attr.value, *attr.pos); + } else { + throw EvalError("unsupported argument '%s' to 'fetchMercurial', at %s", + attr.name, *attr.pos); + } + } + + if (url.empty()) { + throw EvalError(format("'url' argument required, at %1%") % pos); + } + + } else { + url = state.coerceToString(pos, *args[0], context, false, false); + } + + // FIXME: git externals probably can be used to bypass the URI + // whitelist. Ah well. + state.checkURI(url); + + auto hgInfo = exportMercurial(state.store, url, rev, name); + + state.mkAttrs(v, 8); + mkString(*state.allocAttr(v, state.sOutPath), hgInfo.storePath, + PathSet({hgInfo.storePath})); + mkString(*state.allocAttr(v, state.symbols.Create("branch")), hgInfo.branch); + mkString(*state.allocAttr(v, state.symbols.Create("rev")), hgInfo.rev); + mkString(*state.allocAttr(v, state.symbols.Create("shortRev")), + std::string(hgInfo.rev, 0, 12)); + mkInt(*state.allocAttr(v, state.symbols.Create("revCount")), hgInfo.revCount); + + if (state.allowedPaths) { + state.allowedPaths->insert(state.store->toRealPath(hgInfo.storePath)); + } +} + +static RegisterPrimOp r("fetchMercurial", 1, prim_fetchMercurial); + +} // namespace nix diff --git a/third_party/nix/src/libexpr/primops/fromTOML.cc b/third_party/nix/src/libexpr/primops/fromTOML.cc new file mode 100644 index 000000000000..e3d2a4940769 --- /dev/null +++ b/third_party/nix/src/libexpr/primops/fromTOML.cc @@ -0,0 +1,94 @@ +#include "cpptoml/cpptoml.h" +#include "libexpr/eval-inline.hh" +#include "libexpr/primops.hh" + +namespace nix { + +static void prim_fromTOML(EvalState& state, const Pos& pos, Value** args, + Value& v) { + using namespace cpptoml; + + auto toml = state.forceStringNoCtx(*args[0], pos); + + std::istringstream tomlStream(toml); + + std::function<void(Value&, std::shared_ptr<base>)> visit; + + visit = [&](Value& v, std::shared_ptr<base> t) { + if (auto t2 = t->as_table()) { + size_t size = 0; + for (auto& i : *t2) { + (void)i; + size++; + } + + state.mkAttrs(v, size); + + for (auto& i : *t2) { + auto& v2 = *state.allocAttr(v, state.symbols.Create(i.first)); + + if (auto i2 = i.second->as_table_array()) { + size_t size2 = i2->get().size(); + state.mkList(v2, size2); + for (size_t j = 0; j < size2; ++j) { + visit(*((*v2.list)[j] = state.allocValue()), i2->get()[j]); + } + } else { + visit(v2, i.second); + } + } + } + + else if (auto t2 = t->as_array()) { + size_t size = t2->get().size(); + + state.mkList(v, size); + + for (size_t i = 0; i < size; ++i) { + visit(*((*v.list)[i] = state.allocValue()), t2->get()[i]); + } + } + + // Handle cases like 'a = [[{ a = true }]]', which IMHO should be + // parsed as a array containing an array containing a table, + // but instead are parsed as an array containing a table array + // containing a table. + else if (auto t2 = t->as_table_array()) { + size_t size = t2->get().size(); + + state.mkList(v, size); + + for (size_t j = 0; j < size; ++j) { + visit(*((*v.list)[j] = state.allocValue()), t2->get()[j]); + } + } + + else if (t->is_value()) { + if (auto val = t->as<int64_t>()) { + mkInt(v, val->get()); + } else if (auto val = t->as<NixFloat>()) { + mkFloat(v, val->get()); + } else if (auto val = t->as<bool>()) { + mkBool(v, val->get()); + } else if (auto val = t->as<std::string>()) { + mkString(v, val->get()); + } else { + throw EvalError("unsupported value type in TOML"); + } + } + + else { + abort(); + } + }; + + try { + visit(v, parser(tomlStream).parse()); + } catch (std::runtime_error& e) { + throw EvalError("while parsing a TOML string at %s: %s", pos, e.what()); + } +} + +static RegisterPrimOp r("fromTOML", 1, prim_fromTOML); + +} // namespace nix |