forked from lix-project/lix
322 lines
11 KiB
C++
322 lines
11 KiB
C++
#include "command.hh"
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#include "common-args.hh"
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#include "shared.hh"
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#include "store-api.hh"
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#include "filetransfer.hh"
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#include "finally.hh"
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#include "progress-bar.hh"
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#include "tarfile.hh"
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#include "attr-path.hh"
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#include "eval-inline.hh"
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#include "legacy.hh"
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#include <nlohmann/json.hpp>
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using namespace nix;
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/* If ‘url’ starts with ‘mirror://’, then resolve it using the list of
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mirrors defined in Nixpkgs. */
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std::string resolveMirrorUrl(EvalState & state, const std::string & url)
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{
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if (url.substr(0, 9) != "mirror://") return url;
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std::string s(url, 9);
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auto p = s.find('/');
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if (p == std::string::npos) throw Error("invalid mirror URL '%s'", url);
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std::string mirrorName(s, 0, p);
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Value vMirrors;
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// FIXME: use nixpkgs flake
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state.eval(state.parseExprFromString("import <nixpkgs/pkgs/build-support/fetchurl/mirrors.nix>", "."), vMirrors);
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state.forceAttrs(vMirrors, noPos, "while evaluating the set of all mirrors");
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auto mirrorList = vMirrors.attrs->find(state.symbols.create(mirrorName));
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if (mirrorList == vMirrors.attrs->end())
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throw Error("unknown mirror name '%s'", mirrorName);
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state.forceList(*mirrorList->value, noPos, "while evaluating one mirror configuration");
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if (mirrorList->value->listSize() < 1)
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throw Error("mirror URL '%s' did not expand to anything", url);
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std::string mirror(state.forceString(*mirrorList->value->listElems()[0], noPos, "while evaluating the first available mirror"));
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return mirror + (hasSuffix(mirror, "/") ? "" : "/") + s.substr(p + 1);
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}
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std::tuple<StorePath, Hash> prefetchFile(
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ref<Store> store,
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std::string_view url,
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std::optional<std::string> name,
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HashType hashType,
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std::optional<Hash> expectedHash,
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bool unpack,
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bool executable)
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{
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auto ingestionMethod = unpack || executable ? FileIngestionMethod::Recursive : FileIngestionMethod::Flat;
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/* Figure out a name in the Nix store. */
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if (!name) {
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name = baseNameOf(url);
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if (name->empty())
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throw Error("cannot figure out file name for '%s'", url);
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}
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std::optional<StorePath> storePath;
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std::optional<Hash> hash;
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/* If an expected hash is given, the file may already exist in
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the store. */
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if (expectedHash) {
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hashType = expectedHash->type;
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storePath = store->makeFixedOutputPath(*name, FixedOutputInfo {
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{
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.method = ingestionMethod,
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.hash = *expectedHash,
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},
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.references = {},
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});
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if (store->isValidPath(*storePath))
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hash = expectedHash;
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else
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storePath.reset();
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}
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if (!storePath) {
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AutoDelete tmpDir(createTempDir(), true);
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Path tmpFile = (Path) tmpDir + "/tmp";
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/* Download the file. */
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{
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auto mode = 0600;
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if (executable)
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mode = 0700;
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AutoCloseFD fd = open(tmpFile.c_str(), O_WRONLY | O_CREAT | O_EXCL, mode);
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if (!fd) throw SysError("creating temporary file '%s'", tmpFile);
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FdSink sink(fd.get());
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FileTransferRequest req(url);
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req.decompress = false;
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getFileTransfer()->download(std::move(req), sink);
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}
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/* Optionally unpack the file. */
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if (unpack) {
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Activity act(*logger, lvlChatty, actUnknown,
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fmt("unpacking '%s'", url));
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Path unpacked = (Path) tmpDir + "/unpacked";
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createDirs(unpacked);
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unpackTarfile(tmpFile, unpacked);
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/* If the archive unpacks to a single file/directory, then use
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that as the top-level. */
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auto entries = readDirectory(unpacked);
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if (entries.size() == 1)
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tmpFile = unpacked + "/" + entries[0].name;
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else
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tmpFile = unpacked;
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}
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Activity act(*logger, lvlChatty, actUnknown,
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fmt("adding '%s' to the store", url));
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auto info = store->addToStoreSlow(*name, tmpFile, ingestionMethod, hashType, expectedHash);
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storePath = info.path;
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assert(info.ca);
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hash = getContentAddressHash(*info.ca);
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}
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return {storePath.value(), hash.value()};
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}
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static int main_nix_prefetch_url(int argc, char * * argv)
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{
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{
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HashType ht = htSHA256;
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std::vector<std::string> args;
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bool printPath = getEnv("PRINT_PATH") == "1";
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bool fromExpr = false;
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std::string attrPath;
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bool unpack = false;
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bool executable = false;
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std::optional<std::string> name;
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struct MyArgs : LegacyArgs, MixEvalArgs
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{
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using LegacyArgs::LegacyArgs;
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};
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MyArgs myArgs(std::string(baseNameOf(argv[0])), [&](Strings::iterator & arg, const Strings::iterator & end) {
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if (*arg == "--help")
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showManPage("nix-prefetch-url");
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else if (*arg == "--version")
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printVersion("nix-prefetch-url");
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else if (*arg == "--type") {
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auto s = getArg(*arg, arg, end);
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ht = parseHashType(s);
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}
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else if (*arg == "--print-path")
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printPath = true;
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else if (*arg == "--attr" || *arg == "-A") {
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fromExpr = true;
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attrPath = getArg(*arg, arg, end);
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}
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else if (*arg == "--unpack")
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unpack = true;
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else if (*arg == "--executable")
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executable = true;
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else if (*arg == "--name")
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name = getArg(*arg, arg, end);
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else if (*arg != "" && arg->at(0) == '-')
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return false;
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else
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args.push_back(*arg);
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return true;
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});
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myArgs.parseCmdline(argvToStrings(argc, argv));
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if (args.size() > 2)
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throw UsageError("too many arguments");
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Finally f([]() { stopProgressBar(); });
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if (isatty(STDERR_FILENO))
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startProgressBar();
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auto store = openStore();
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auto state = std::make_unique<EvalState>(myArgs.searchPath, store);
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Bindings & autoArgs = *myArgs.getAutoArgs(*state);
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/* If -A is given, get the URL from the specified Nix
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expression. */
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std::string url;
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if (!fromExpr) {
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if (args.empty())
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throw UsageError("you must specify a URL");
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url = args[0];
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} else {
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Path path = resolveExprPath(lookupFileArg(*state, args.empty() ? "." : args[0]));
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Value vRoot;
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state->evalFile(path, vRoot);
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Value & v(*findAlongAttrPath(*state, attrPath, autoArgs, vRoot).first);
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state->forceAttrs(v, noPos, "while evaluating the source attribute to prefetch");
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/* Extract the URL. */
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auto * attr = v.attrs->get(state->symbols.create("urls"));
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if (!attr)
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throw Error("attribute 'urls' missing");
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state->forceList(*attr->value, noPos, "while evaluating the urls to prefetch");
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if (attr->value->listSize() < 1)
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throw Error("'urls' list is empty");
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url = state->forceString(*attr->value->listElems()[0], noPos, "while evaluating the first url from the urls list");
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/* Extract the hash mode. */
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auto attr2 = v.attrs->get(state->symbols.create("outputHashMode"));
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if (!attr2)
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printInfo("warning: this does not look like a fetchurl call");
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else
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unpack = state->forceString(*attr2->value, noPos, "while evaluating the outputHashMode of the source to prefetch") == "recursive";
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/* Extract the name. */
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if (!name) {
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auto attr3 = v.attrs->get(state->symbols.create("name"));
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if (!attr3)
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name = state->forceString(*attr3->value, noPos, "while evaluating the name of the source to prefetch");
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}
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}
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std::optional<Hash> expectedHash;
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if (args.size() == 2)
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expectedHash = Hash::parseAny(args[1], ht);
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auto [storePath, hash] = prefetchFile(
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store, resolveMirrorUrl(*state, url), name, ht, expectedHash, unpack, executable);
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stopProgressBar();
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if (!printPath)
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printInfo("path is '%s'", store->printStorePath(storePath));
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std::cout << printHash16or32(hash) << std::endl;
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if (printPath)
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std::cout << store->printStorePath(storePath) << std::endl;
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return 0;
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}
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}
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static RegisterLegacyCommand r_nix_prefetch_url("nix-prefetch-url", main_nix_prefetch_url);
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struct CmdStorePrefetchFile : StoreCommand, MixJSON
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{
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std::string url;
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bool executable = false;
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std::optional<std::string> name;
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HashType hashType = htSHA256;
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std::optional<Hash> expectedHash;
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CmdStorePrefetchFile()
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{
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addFlag({
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.longName = "name",
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.description = "Override the name component of the resulting store path. It defaults to the base name of *url*.",
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.labels = {"name"},
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.handler = {&name}
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});
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addFlag({
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.longName = "expected-hash",
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.description = "The expected hash of the file.",
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.labels = {"hash"},
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.handler = {[&](std::string s) {
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expectedHash = Hash::parseAny(s, hashType);
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}}
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});
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addFlag(Flag::mkHashTypeFlag("hash-type", &hashType));
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addFlag({
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.longName = "executable",
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.description =
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"Make the resulting file executable. Note that this causes the "
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"resulting hash to be a NAR hash rather than a flat file hash.",
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.handler = {&executable, true},
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});
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expectArg("url", &url);
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}
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std::string description() override
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{
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return "download a file into the Nix store";
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}
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std::string doc() override
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{
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return
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#include "store-prefetch-file.md"
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;
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}
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void run(ref<Store> store) override
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{
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auto [storePath, hash] = prefetchFile(store, url, name, hashType, expectedHash, false, executable);
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if (json) {
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auto res = nlohmann::json::object();
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res["storePath"] = store->printStorePath(storePath);
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res["hash"] = hash.to_string(SRI, true);
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logger->cout(res.dump());
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} else {
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notice("Downloaded '%s' to '%s' (hash '%s').",
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url,
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store->printStorePath(storePath),
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hash.to_string(SRI, true));
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}
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}
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};
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static auto rCmdStorePrefetchFile = registerCommand2<CmdStorePrefetchFile>({"store", "prefetch-file"});
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