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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)
{
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;
};
auto fetch = [&](const string & url) {
/* No need to do TLS verification, because we check the hash of
the result anyway. */
DownloadRequest request(url);
request.verifyTLS = false;
/* Show a progress indicator, even though stderr is not a tty. */
request.showProgress = DownloadRequest::yes;
/* Note: have to use a fresh downloader here because we're in
a forked process. */
auto data = makeDownloader()->download(request);
assert(data.data);
return data.data;
};
std::shared_ptr<std::string> data;
try {
if (getAttr("outputHashMode") == "flat")
data = fetch("http://tarballs.nixos.org/" + getAttr("outputHashAlgo") + "/" + getAttr("outputHash"));
} catch (Error & e) {
debug(e.what());
}
if (!data) data = fetch(getAttr("url"));
Path storePath = getAttr("out");
auto unpack = drv.env.find("unpack");
if (unpack != drv.env.end() && unpack->second == "1") {
if (string(*data, 0, 6) == string("\xfd" "7zXZ\0", 6))
data = decompress("xz", *data);
StringSource source(*data);
restorePath(storePath, source);
} else
writeFile(storePath, *data);
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);
}
}
}
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