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#include "builtins.hh"
#include "filetransfer.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 std::string & name) {
auto i = drv.env.find(name);
if (i == drv.env.end()) throw Error("attribute '%s' missing", name);
return i->second;
};
Path storePath = getAttr("out");
auto mainUrl = getAttr("url");
bool unpack = getOr(drv.env, "unpack", "") == "1";
/* Note: have to use a fresh fileTransfer here because we're in
a forked process. */
auto fileTransfer = makeFileTransfer();
auto fetch = [&](const std::string & url) {
/* No need to do TLS verification, because we check the hash of
the result anyway. */
FileTransferRequest request(url);
request.verifyTLS = false;
auto raw = fileTransfer->download(std::move(request));
auto decompressor = makeDecompressionSource(
unpack && mainUrl.ends_with(".xz") ? "xz" : "none", *raw);
if (unpack)
restorePath(storePath, *decompressor);
else
writeFile(storePath, *decompressor);
auto executable = drv.env.find("executable");
if (executable != drv.env.end() && executable->second == "1") {
if (chmod(storePath.c_str(), 0755) == -1)
throw SysError("making '%1%' executable", storePath);
}
};
/* Try the hashed mirrors first. */
if (getAttr("outputHashMode") == "flat")
for (auto hashedMirror : settings.hashedMirrors.get())
try {
if (!hashedMirror.ends_with("/")) hashedMirror += '/';
std::optional<HashType> ht = parseHashTypeOpt(getAttr("outputHashAlgo"));
Hash h = newHashAllowEmpty(getAttr("outputHash"), ht);
fetch(hashedMirror + printHashType(h.type) + "/" + h.to_string(Base16, false));
return;
} catch (Error & e) {
debug(e.what());
}
/* Otherwise try the specified URL. */
fetch(mainUrl);
}
}
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