forked from lix-project/lix
137 lines
4.5 KiB
C++
137 lines
4.5 KiB
C++
#include "hash.hh"
|
||
#include "shared.hh"
|
||
#include "download.hh"
|
||
#include "store-api.hh"
|
||
#include "eval.hh"
|
||
#include "eval-inline.hh"
|
||
#include "common-opts.hh"
|
||
|
||
#include <iostream>
|
||
|
||
using namespace nix;
|
||
|
||
|
||
/* If ‘uri’ starts with ‘mirror://’, then resolve it using the list of
|
||
mirrors defined in Nixpkgs. */
|
||
string resolveMirrorUri(EvalState & state, string uri)
|
||
{
|
||
if (string(uri, 0, 9) != "mirror://") return uri;
|
||
|
||
string s(uri, 9);
|
||
auto p = s.find('/');
|
||
if (p == string::npos) throw Error("invalid mirror URI");
|
||
string mirrorName(s, 0, p);
|
||
|
||
Value vMirrors;
|
||
state.eval(state.parseExprFromString("import <nixpkgs/pkgs/build-support/fetchurl/mirrors.nix>", "."), vMirrors);
|
||
state.forceAttrs(vMirrors);
|
||
|
||
auto mirrorList = vMirrors.attrs->find(state.symbols.create(mirrorName));
|
||
if (mirrorList == vMirrors.attrs->end())
|
||
throw Error(format("unknown mirror name ‘%1%’") % mirrorName);
|
||
state.forceList(*mirrorList->value);
|
||
|
||
if (mirrorList->value->listSize() < 1)
|
||
throw Error(format("mirror URI ‘%1%’ did not expand to anything") % uri);
|
||
|
||
string mirror = state.forceString(*mirrorList->value->listElems()[0]);
|
||
return mirror + (hasSuffix(mirror, "/") ? "" : "/") + string(s, p + 1);
|
||
}
|
||
|
||
|
||
int main(int argc, char * * argv)
|
||
{
|
||
return handleExceptions(argv[0], [&]() {
|
||
initNix();
|
||
initGC();
|
||
|
||
HashType ht = htSHA256;
|
||
std::vector<string> args;
|
||
Strings searchPath;
|
||
bool printPath = getEnv("PRINT_PATH") != "";
|
||
|
||
parseCmdLine(argc, argv, [&](Strings::iterator & arg, const Strings::iterator & end) {
|
||
if (*arg == "--help")
|
||
showManPage("nix-prefetch-url");
|
||
else if (*arg == "--version")
|
||
printVersion("nix-prefetch-url");
|
||
else if (*arg == "--type") {
|
||
string s = getArg(*arg, arg, end);
|
||
ht = parseHashType(s);
|
||
if (ht == htUnknown)
|
||
throw UsageError(format("unknown hash type ‘%1%’") % s);
|
||
}
|
||
else if (*arg == "--print-path")
|
||
printPath = true;
|
||
else if (parseSearchPathArg(arg, end, searchPath))
|
||
;
|
||
else if (*arg != "" && arg->at(0) == '-')
|
||
return false;
|
||
else
|
||
args.push_back(*arg);
|
||
return true;
|
||
});
|
||
|
||
if (args.size() < 1 || args.size() > 2)
|
||
throw UsageError("nix-prefetch-url expects one argument");
|
||
|
||
store = openStore();
|
||
|
||
EvalState state(searchPath);
|
||
|
||
/* Figure out a name in the Nix store. */
|
||
auto uri = args[0];
|
||
auto name = baseNameOf(uri);
|
||
if (name.empty())
|
||
throw Error(format("cannot figure out file name for ‘%1%’") % uri);
|
||
|
||
/* If an expected hash is given, the file may already exist in
|
||
the store. */
|
||
Hash hash, expectedHash(ht);
|
||
Path storePath;
|
||
if (args.size() == 2) {
|
||
expectedHash = parseHash16or32(ht, args[1]);
|
||
storePath = makeFixedOutputPath(false, ht, expectedHash, name);
|
||
if (store->isValidPath(storePath))
|
||
hash = expectedHash;
|
||
else
|
||
storePath.clear();
|
||
}
|
||
|
||
if (storePath.empty()) {
|
||
|
||
auto actualUri = resolveMirrorUri(state, uri);
|
||
|
||
if (uri != actualUri)
|
||
printMsg(lvlInfo, format("‘%1%’ expands to ‘%2%’") % uri % actualUri);
|
||
|
||
/* Download the file. */
|
||
auto result = downloadFile(actualUri);
|
||
|
||
/* Copy the file to the Nix store. FIXME: if RemoteStore
|
||
implemented addToStoreFromDump() and downloadFile()
|
||
supported a sink, we could stream the download directly
|
||
into the Nix store. */
|
||
AutoDelete tmpDir(createTempDir(), true);
|
||
Path tmpFile = (Path) tmpDir + "/tmp";
|
||
writeFile(tmpFile, result.data);
|
||
|
||
/* FIXME: inefficient; addToStore() will also hash
|
||
this. */
|
||
hash = hashString(ht, result.data);
|
||
|
||
if (expectedHash != Hash(ht) && expectedHash != hash)
|
||
throw Error(format("hash mismatch for ‘%1%’") % uri);
|
||
|
||
storePath = store->addToStore(name, tmpFile, false, ht);
|
||
}
|
||
|
||
if (!printPath)
|
||
printMsg(lvlInfo, format("path is ‘%1%’") % storePath);
|
||
|
||
std::cout << printHash16or32(hash) << std::endl;
|
||
if (printPath)
|
||
std::cout << storePath << std::endl;
|
||
});
|
||
}
|