bcbdb09ccf
`eval-system` option overrides just the value of `builtins.currentSystem`. This is more useful than overriding `system` since you can build these derivations on remote builders which can work on the given system. Co-authored-by: John Ericson <John.Ericson@Obsidian.Systems> Co-authored-by: Valentin Gagarin <valentin.gagarin@tweag.io>
110 lines
2.7 KiB
C++
110 lines
2.7 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()
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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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}
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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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if (!evalSettings.restrictEval && !evalSettings.pureEval) {
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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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}
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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()
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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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EvalSettings evalSettings;
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static GlobalConfig::Register rEvalSettings(&evalSettings);
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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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