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