diff options
Diffstat (limited to 'third_party/nix/src/libstore/builtins/fetchurl.cc')
-rw-r--r-- | third_party/nix/src/libstore/builtins/fetchurl.cc | 81 |
1 files changed, 81 insertions, 0 deletions
diff --git a/third_party/nix/src/libstore/builtins/fetchurl.cc b/third_party/nix/src/libstore/builtins/fetchurl.cc new file mode 100644 index 000000000000..90814f6d7f0b --- /dev/null +++ b/third_party/nix/src/libstore/builtins/fetchurl.cc @@ -0,0 +1,81 @@ +#include <absl/strings/match.h> +#include <glog/logging.h> + +#include "archive.hh" +#include "builtins.hh" +#include "compression.hh" +#include "download.hh" +#include "store-api.hh" + +namespace nix { + +void builtinFetchurl(const BasicDerivation& drv, const std::string& netrcData) { + /* Make the host's netrc data available. Too bad curl requires + this to be stored in a file. It would be nice if we could just + pass a pointer to the data. */ + if (netrcData != "") { + settings.netrcFile = "netrc"; + writeFile(settings.netrcFile, netrcData, 0600); + } + + auto getAttr = [&](const std::string& name) { + auto i = drv.env.find(name); + if (i == drv.env.end()) + throw Error(format("attribute '%s' missing") % name); + return i->second; + }; + + Path storePath = getAttr("out"); + auto mainUrl = getAttr("url"); + bool unpack = get(drv.env, "unpack", "") == "1"; + + /* Note: have to use a fresh downloader here because we're in + a forked process. */ + auto downloader = makeDownloader(); + + auto fetch = [&](const std::string& url) { + auto source = sinkToSource([&](Sink& sink) { + /* No need to do TLS verification, because we check the hash of + the result anyway. */ + DownloadRequest request(url); + request.verifyTLS = false; + request.decompress = false; + + auto decompressor = makeDecompressionSink( + unpack && absl::EndsWith(mainUrl, ".xz") ? "xz" : "none", sink); + downloader->download(std::move(request), *decompressor); + decompressor->finish(); + }); + + if (unpack) + restorePath(storePath, *source); + else + writeFile(storePath, *source); + + auto executable = drv.env.find("executable"); + if (executable != drv.env.end() && executable->second == "1") { + if (chmod(storePath.c_str(), 0755) == -1) + throw SysError(format("making '%1%' executable") % storePath); + } + }; + + /* Try the hashed mirrors first. */ + if (getAttr("outputHashMode") == "flat") + for (auto hashedMirror : settings.hashedMirrors.get()) try { + if (!absl::EndsWith(hashedMirror, "/")) { + hashedMirror += '/'; + } + auto ht = parseHashType(getAttr("outputHashAlgo")); + auto h = Hash(getAttr("outputHash"), ht); + fetch(hashedMirror + printHashType(h.type) + "/" + + h.to_string(Base16, false)); + return; + } catch (Error& e) { + LOG(ERROR) << e.what(); + } + + /* Otherwise try the specified URL. */ + fetch(mainUrl); +} + +} // namespace nix |