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#include "builtins.hh"
#include "download.hh"
#include "store-api.hh"
#include "archive.hh"
#include "compression.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 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");
/* 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;
downloader->download(std::move(request), sink);
});
if (get(drv.env, "unpack", "") == "1") {
if (hasSuffix(mainUrl, ".xz")) {
auto source2 = sinkToSource([&](Sink & sink) {
decompress("xz", *source, sink);
});
restorePath(storePath, *source2);
} else
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 (!hasSuffix(hashedMirror, "/")) hashedMirror += '/';
auto ht = parseHashType(getAttr("outputHashAlgo"));
fetch(hashedMirror + printHashType(ht) + "/" + Hash(getAttr("outputHash"), ht).to_string(Base16, false));
return;
} catch (Error & e) {
debug(e.what());
}
/* Otherwise try the specified URL. */
fetch(mainUrl);
}
}
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