mirror of
https://github.com/NixOS/nix.git
synced 2025-11-19 00:39:37 +01:00
464e5925cb
The default value for the setting was evaluated by calling a method on the object _being currently constructed_, so we were using it before all fields were initialized. This has been fixed by making the called method static, and not using the previously used fields at all. But functionality hasn't changed! The fields were usually always zero (by chance?) anyway, meaning the conditional path was always taken. Thus the current logic has been kept, the code simplified, and UB removed. This was found with the helper of UBSan.
109 lines
2.8 KiB
C++
109 lines
2.8 KiB
C++
#include "users.hh"
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#include "globals.hh"
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#include "profiles.hh"
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#include "eval.hh"
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#include "eval-settings.hh"
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namespace nix {
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/* Very hacky way to parse $NIX_PATH, which is colon-separated, but
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can contain URLs (e.g. "nixpkgs=https://bla...:foo=https://"). */
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static Strings parseNixPath(const std::string & s)
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{
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Strings res;
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auto p = s.begin();
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while (p != s.end()) {
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auto start = p;
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auto start2 = p;
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while (p != s.end() && *p != ':') {
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if (*p == '=') start2 = p + 1;
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++p;
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}
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if (p == s.end()) {
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if (p != start) res.push_back(std::string(start, p));
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break;
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}
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if (*p == ':') {
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auto prefix = std::string(start2, s.end());
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if (EvalSettings::isPseudoUrl(prefix) || hasPrefix(prefix, "flake:")) {
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++p;
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while (p != s.end() && *p != ':') ++p;
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}
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res.push_back(std::string(start, p));
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if (p == s.end()) break;
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}
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++p;
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}
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return res;
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}
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EvalSettings::EvalSettings(bool & readOnlyMode, EvalSettings::LookupPathHooks lookupPathHooks)
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: readOnlyMode{readOnlyMode}
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, lookupPathHooks{lookupPathHooks}
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{
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auto var = getEnv("NIX_PATH");
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if (var) nixPath = parseNixPath(*var);
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var = getEnv("NIX_ABORT_ON_WARN");
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if (var && (var == "1" || var == "yes" || var == "true"))
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builtinsAbortOnWarn = true;
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}
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Strings EvalSettings::getDefaultNixPath()
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{
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Strings res;
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auto add = [&](const Path & p, const std::string & s = std::string()) {
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if (pathAccessible(p)) {
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if (s.empty()) {
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res.push_back(p);
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} else {
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res.push_back(s + "=" + p);
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}
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}
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};
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add(getNixDefExpr() + "/channels");
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add(rootChannelsDir() + "/nixpkgs", "nixpkgs");
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add(rootChannelsDir());
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return res;
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}
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bool EvalSettings::isPseudoUrl(std::string_view s)
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{
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if (s.compare(0, 8, "channel:") == 0) return true;
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size_t pos = s.find("://");
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if (pos == std::string::npos) return false;
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std::string scheme(s, 0, pos);
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return scheme == "http" || scheme == "https" || scheme == "file" || scheme == "channel" || scheme == "git" || scheme == "s3" || scheme == "ssh";
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}
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std::string EvalSettings::resolvePseudoUrl(std::string_view url)
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{
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if (hasPrefix(url, "channel:"))
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return "https://nixos.org/channels/" + std::string(url.substr(8)) + "/nixexprs.tar.xz";
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else
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return std::string(url);
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}
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const std::string & EvalSettings::getCurrentSystem() const
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{
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const auto & evalSystem = currentSystem.get();
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return evalSystem != "" ? evalSystem : settings.thisSystem.get();
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}
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Path getNixDefExpr()
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{
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return settings.useXDGBaseDirectories
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? getStateDir() + "/nix/defexpr"
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: getHome() + "/.nix-defexpr";
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}
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}
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