eldritch horrors
6f18e1ebde
it's just a uri and some headers now. those can be function arguments with no loss of clarity. *actual* additional arguments, for example a TLS context with additional certificates, could be added on a new and improved FileTransfer class that carries not just a backend reference but some real, visible context for its transfers. curl not being very multi-threading-friendly when using multi handles will make sharing a bit hard anyway once we drop the single global download worker thread Change-Id: Id2112c95cbd118c6d920488f38d272d7da926460
73 lines
2.4 KiB
C++
73 lines
2.4 KiB
C++
#include "builtins.hh"
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#include "filetransfer.hh"
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#include "store-api.hh"
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#include "archive.hh"
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#include "compression.hh"
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#include "strings.hh"
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namespace nix {
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void builtinFetchurl(const BasicDerivation & drv, const std::string & netrcData, const std::string & caFileData)
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{
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/* Make the host's netrc data available. Too bad curl requires
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this to be stored in a file. It would be nice if we could just
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pass a pointer to the data. */
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if (netrcData != "") {
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settings.netrcFile.override("netrc");
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writeFile(settings.netrcFile, netrcData, 0600);
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}
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settings.caFile.override("ca-certificates.crt");
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writeFile(settings.caFile, caFileData, 0600);
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auto getAttr = [&](const std::string & name) {
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auto i = drv.env.find(name);
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if (i == drv.env.end()) throw Error("attribute '%s' missing", name);
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return i->second;
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};
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Path storePath = getAttr("out");
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auto mainUrl = getAttr("url");
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bool unpack = getOr(drv.env, "unpack", "") == "1";
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/* Note: have to use a fresh fileTransfer here because we're in
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a forked process. */
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auto fileTransfer = makeFileTransfer();
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auto fetch = [&](const std::string & url) {
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auto raw = fileTransfer->download(url);
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auto decompressor = makeDecompressionSource(
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unpack && mainUrl.ends_with(".xz") ? "xz" : "none", *raw);
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if (unpack)
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restorePath(storePath, *decompressor);
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else
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writeFile(storePath, *decompressor);
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auto executable = drv.env.find("executable");
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if (executable != drv.env.end() && executable->second == "1") {
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if (chmod(storePath.c_str(), 0755) == -1)
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throw SysError("making '%1%' executable", storePath);
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}
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};
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/* Try the hashed mirrors first. */
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if (getAttr("outputHashMode") == "flat")
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for (auto hashedMirror : settings.hashedMirrors.get())
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try {
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if (!hashedMirror.ends_with("/")) hashedMirror += '/';
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std::optional<HashType> ht = parseHashTypeOpt(getAttr("outputHashAlgo"));
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Hash h = newHashAllowEmpty(getAttr("outputHash"), ht);
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fetch(hashedMirror + printHashType(h.type) + "/" + h.to_string(Base::Base16, false));
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return;
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} catch (Error & e) {
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debug(e.what());
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}
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/* Otherwise try the specified URL. */
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fetch(mainUrl);
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}
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}
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