234 lines
7.8 KiB
C++
234 lines
7.8 KiB
C++
#include "hash.hh"
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#include "shared.hh"
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#include "download.hh"
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#include "store-api.hh"
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#include "eval.hh"
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#include "eval-inline.hh"
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#include "common-eval-args.hh"
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#include "attr-path.hh"
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#include "legacy.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 <iostream>
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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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using namespace nix;
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/* If ‘uri’ starts with ‘mirror://’, then resolve it using the list of
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mirrors defined in Nixpkgs. */
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string resolveMirrorUri(EvalState & state, string uri)
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{
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if (string(uri, 0, 9) != "mirror://") return uri;
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string s(uri, 9);
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auto p = s.find('/');
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if (p == string::npos) throw Error("invalid mirror URI");
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string mirrorName(s, 0, p);
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Value vMirrors;
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state.eval(state.parseExprFromString("import <nixpkgs/pkgs/build-support/fetchurl/mirrors.nix>", "."), vMirrors);
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state.forceAttrs(vMirrors);
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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(format("unknown mirror name '%1%'") % mirrorName);
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state.forceList(*mirrorList->value);
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if (mirrorList->value->listSize() < 1)
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throw Error(format("mirror URI '%1%' did not expand to anything") % uri);
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string mirror = state.forceString(*mirrorList->value->listElems()[0]);
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return mirror + (hasSuffix(mirror, "/") ? "" : "/") + string(s, p + 1);
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}
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static int _main(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<string> args;
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bool printPath = getEnv("PRINT_PATH") != "";
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bool fromExpr = false;
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string attrPath;
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bool unpack = false;
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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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string s = getArg(*arg, arg, end);
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ht = parseHashType(s);
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if (ht == htUnknown)
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throw UsageError(format("unknown hash type '%1%'") % 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 == "--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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initPlugins();
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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 URI from the specified Nix
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expression. */
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string uri;
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if (!fromExpr) {
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if (args.empty())
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throw UsageError("you must specify a URI");
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uri = 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));
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state->forceAttrs(v);
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/* Extract the URI. */
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auto attr = v.attrs->find(state->symbols.create("urls"));
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if (attr == v.attrs->end())
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throw Error("attribute set does not contain a 'urls' attribute");
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state->forceList(*attr->value);
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if (attr->value->listSize() < 1)
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throw Error("'urls' list is empty");
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uri = state->forceString(*attr->value->listElems()[0]);
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/* Extract the hash mode. */
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attr = v.attrs->find(state->symbols.create("outputHashMode"));
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if (attr == v.attrs->end())
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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(*attr->value) == "recursive";
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/* Extract the name. */
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if (name.empty()) {
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attr = v.attrs->find(state->symbols.create("name"));
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if (attr != v.attrs->end())
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name = state->forceString(*attr->value);
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}
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}
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/* Figure out a name in the Nix store. */
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if (name.empty())
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name = baseNameOf(uri);
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if (name.empty())
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throw Error(format("cannot figure out file name for '%1%'") % uri);
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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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Hash hash, expectedHash(ht);
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std::optional<StorePath> storePath;
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if (args.size() == 2) {
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expectedHash = Hash(args[1], ht);
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storePath = store->makeFixedOutputPath(unpack, expectedHash, name);
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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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auto actualUri = resolveMirrorUri(*state, uri);
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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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AutoCloseFD fd = open(tmpFile.c_str(), O_WRONLY | O_CREAT | O_EXCL, 0600);
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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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DownloadRequest req(actualUri);
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req.decompress = false;
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getDownloader()->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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printInfo("unpacking...");
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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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/* FIXME: inefficient; addToStore() will also hash
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this. */
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hash = unpack ? hashPath(ht, tmpFile).first : hashFile(ht, tmpFile);
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if (expectedHash != Hash(ht) && expectedHash != hash)
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throw Error(format("hash mismatch for '%1%'") % uri);
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/* Copy the file to the Nix store. FIXME: if RemoteStore
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implemented addToStoreFromDump() and downloadFile()
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supported a sink, we could stream the download directly
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into the Nix store. */
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storePath = store->addToStore(name, tmpFile, unpack, ht);
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assert(*storePath == store->makeFixedOutputPath(unpack, hash, name));
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}
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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 s1("nix-prefetch-url", _main);
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