133 lines
4.3 KiB
C++
133 lines
4.3 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-opts.hh"
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#include <iostream>
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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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int main(int argc, char * * argv)
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{
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return handleExceptions(argv[0], [&]() {
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initNix();
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initGC();
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HashType ht = htSHA256;
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std::vector<string> args;
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Strings searchPath;
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parseCmdLine(argc, argv, [&](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 (parseSearchPathArg(arg, end, searchPath))
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;
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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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if (args.size() < 1 || args.size() > 2)
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throw UsageError("nix-prefetch-url expects one argument");
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store = openStore();
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EvalState state(searchPath);
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/* Figure out a name in the Nix store. */
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auto uri = args[0];
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auto 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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Path storePath;
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if (args.size() == 2) {
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expectedHash = parseHash16or32(ht, args[1]);
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storePath = makeFixedOutputPath(false, ht, 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.clear();
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}
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if (storePath.empty()) {
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auto actualUri = resolveMirrorUri(state, uri);
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if (uri != actualUri)
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printMsg(lvlInfo, format("‘%1%’ expands to ‘%2%’") % uri % actualUri);
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/* Download the file. */
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auto result = downloadFile(actualUri);
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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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AutoDelete tmpDir(createTempDir(), true);
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Path tmpFile = (Path) tmpDir + "/tmp";
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writeFile(tmpFile, result.data);
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/* FIXME: inefficient; addToStore() will also hash
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this. */
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hash = hashString(ht, result.data);
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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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storePath = store->addToStore(name, tmpFile, false, ht);
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}
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printMsg(lvlInfo, format("path is ‘%1%’") % storePath);
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std::cout << printHash16or32(hash) << std::endl;
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if (getEnv("PRINT_PATH") != "")
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std::cout << storePath << std::endl;
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});
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}
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