forked from lix-project/lix
259ff74bde
This completes flakerefs using the registry (e.g. 'nix<TAB>' => 'nix nixpkgs') and flake output attributes by evaluating the flake (e.g. 'dwarffs#nix<TAB>' => 'dwarffs#nixosModules').
697 lines
21 KiB
C++
697 lines
21 KiB
C++
#include "installables.hh"
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#include "command.hh"
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#include "attr-path.hh"
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#include "common-eval-args.hh"
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#include "derivations.hh"
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#include "eval-inline.hh"
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#include "eval.hh"
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#include "get-drvs.hh"
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#include "store-api.hh"
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#include "shared.hh"
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#include "flake/flake.hh"
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#include "eval-cache.hh"
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#include "url.hh"
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#include "registry.hh"
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#include <regex>
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#include <queue>
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namespace nix {
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MixFlakeOptions::MixFlakeOptions()
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{
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addFlag({
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.longName = "recreate-lock-file",
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.description = "recreate lock file from scratch",
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.handler = {&lockFlags.recreateLockFile, true}
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});
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addFlag({
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.longName = "no-update-lock-file",
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.description = "do not allow any updates to the lock file",
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.handler = {&lockFlags.updateLockFile, false}
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});
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addFlag({
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.longName = "no-write-lock-file",
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.description = "do not write the newly generated lock file",
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.handler = {&lockFlags.writeLockFile, false}
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});
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addFlag({
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.longName = "no-registries",
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.description = "don't use flake registries",
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.handler = {&lockFlags.useRegistries, false}
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});
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addFlag({
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.longName = "commit-lock-file",
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.description = "commit changes to the lock file",
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.handler = {&lockFlags.commitLockFile, true}
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});
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addFlag({
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.longName = "update-input",
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.description = "update a specific flake input",
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.labels = {"input-path"},
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.handler = {[&](std::string s) {
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lockFlags.inputUpdates.insert(flake::parseInputPath(s));
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}}
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});
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addFlag({
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.longName = "override-input",
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.description = "override a specific flake input (e.g. 'dwarffs/nixpkgs')",
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.labels = {"input-path", "flake-url"},
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.handler = {[&](std::string inputPath, std::string flakeRef) {
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lockFlags.inputOverrides.insert_or_assign(
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flake::parseInputPath(inputPath),
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parseFlakeRef(flakeRef, absPath(".")));
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}}
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});
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}
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SourceExprCommand::SourceExprCommand()
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{
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addFlag({
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.longName = "file",
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.shortName = 'f',
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.description = "evaluate FILE rather than the default",
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.labels = {"file"},
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.handler = {&file},
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.completer = completePath
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});
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addFlag({
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.longName ="expr",
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.description = "evaluate attributes from EXPR",
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.labels = {"expr"},
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.handler = {&expr}
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});
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}
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Strings SourceExprCommand::getDefaultFlakeAttrPaths()
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{
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return {"defaultPackage." + settings.thisSystem.get()};
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}
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Strings SourceExprCommand::getDefaultFlakeAttrPathPrefixes()
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{
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return {
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// As a convenience, look for the attribute in
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// 'outputs.packages'.
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"packages." + settings.thisSystem.get() + ".",
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// As a temporary hack until Nixpkgs is properly converted
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// to provide a clean 'packages' set, look in 'legacyPackages'.
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"legacyPackages." + settings.thisSystem.get() + "."
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};
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}
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void SourceExprCommand::completeInstallable(std::string_view prefix)
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{
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completePath(0, prefix);
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if (file) return; // FIXME
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/* Look for flake output attributes that match the
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prefix. */
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try {
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auto hash = prefix.find('#');
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if (hash != std::string::npos) {
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auto fragment = prefix.substr(hash + 1);
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auto flakeRefS = std::string(prefix.substr(0, hash));
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// FIXME: do tilde expansion.
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auto flakeRef = parseFlakeRef(flakeRefS, absPath("."));
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auto state = getEvalState();
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auto evalCache = openEvalCache(*state,
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std::make_shared<flake::LockedFlake>(lockFlake(*state, flakeRef, lockFlags)),
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true);
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auto root = evalCache->getRoot();
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/* Complete 'fragment' relative to all the
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attrpath prefixes as well as the root of the
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flake. */
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auto attrPathPrefixes = getDefaultFlakeAttrPathPrefixes();
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attrPathPrefixes.push_back("");
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for (auto & attrPathPrefixS : attrPathPrefixes) {
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auto attrPathPrefix = parseAttrPath(*state, attrPathPrefixS);
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auto attrPathS = attrPathPrefixS + std::string(fragment);
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auto attrPath = parseAttrPath(*state, attrPathS);
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std::string lastAttr;
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if (!attrPath.empty() && !hasSuffix(attrPathS, ".")) {
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lastAttr = attrPath.back();
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attrPath.pop_back();
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}
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auto attr = root->findAlongAttrPath(attrPath);
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if (!attr) continue;
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auto attrs = attr->getAttrs();
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for (auto & attr2 : attrs) {
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if (hasPrefix(attr2, lastAttr)) {
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auto attrPath2 = attr->getAttrPath(attr2);
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/* Strip the attrpath prefix. */
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attrPath2.erase(attrPath2.begin(), attrPath2.begin() + attrPathPrefix.size());
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completions->insert(flakeRefS + "#" + concatStringsSep(".", attrPath2));
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}
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}
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}
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/* And add an empty completion for the default
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attrpaths. */
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if (fragment.empty()) {
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for (auto & attrPath : getDefaultFlakeAttrPaths()) {
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auto attr = root->findAlongAttrPath(parseAttrPath(*state, attrPath));
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if (!attr) continue;
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completions->insert(flakeRefS + "#");
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}
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}
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}
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} catch (Error & e) {
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warn(e.msg());
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}
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/* Look for registry entries that match the prefix. */
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for (auto & registry : fetchers::getRegistries(getStore())) {
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for (auto & entry : registry->entries) {
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auto from = entry.from->to_string();
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if (!hasPrefix(prefix, "flake:") && hasPrefix(from, "flake:")) {
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std::string from2(from, 6);
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if (hasPrefix(from2, prefix))
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completions->insert(from2);
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} else {
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if (hasPrefix(from, prefix))
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completions->insert(from);
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}
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}
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}
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}
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ref<EvalState> EvalCommand::getEvalState()
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{
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if (!evalState)
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evalState = std::make_shared<EvalState>(searchPath, getStore());
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return ref<EvalState>(evalState);
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}
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Buildable Installable::toBuildable()
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{
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auto buildables = toBuildables();
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if (buildables.size() != 1)
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throw Error("installable '%s' evaluates to %d derivations, where only one is expected", what(), buildables.size());
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return std::move(buildables[0]);
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}
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App::App(EvalState & state, Value & vApp)
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{
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state.forceAttrs(vApp);
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auto aType = vApp.attrs->need(state.sType);
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if (state.forceStringNoCtx(*aType.value, *aType.pos) != "app")
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throw Error("value does not have type 'app', at %s", *aType.pos);
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auto aProgram = vApp.attrs->need(state.symbols.create("program"));
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program = state.forceString(*aProgram.value, context, *aProgram.pos);
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// FIXME: check that 'program' is in the closure of 'context'.
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if (!state.store->isInStore(program))
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throw Error("app program '%s' is not in the Nix store", program);
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}
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App Installable::toApp(EvalState & state)
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{
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return App(state, *toValue(state).first);
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}
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std::vector<std::pair<std::shared_ptr<eval_cache::AttrCursor>, std::string>>
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Installable::getCursor(EvalState & state, bool useEvalCache)
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{
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auto evalCache =
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std::make_shared<nix::eval_cache::EvalCache>(false, Hash(), state,
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[&]() { return toValue(state).first; });
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return {{evalCache->getRoot(), ""}};
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}
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struct InstallableStorePath : Installable
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{
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ref<Store> store;
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StorePath storePath;
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InstallableStorePath(ref<Store> store, const Path & storePath)
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: store(store), storePath(store->parseStorePath(storePath)) { }
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std::string what() override { return store->printStorePath(storePath); }
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Buildables toBuildables() override
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{
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std::map<std::string, StorePath> outputs;
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outputs.insert_or_assign("out", storePath.clone());
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Buildable b{
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.drvPath = storePath.isDerivation() ? storePath.clone() : std::optional<StorePath>(),
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.outputs = std::move(outputs)
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};
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Buildables bs;
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bs.push_back(std::move(b));
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return bs;
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}
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std::optional<StorePath> getStorePath() override
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{
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return storePath.clone();
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}
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};
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std::vector<InstallableValue::DerivationInfo> InstallableValue::toDerivations()
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{
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auto state = cmd.getEvalState();
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auto v = toValue(*state).first;
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Bindings & autoArgs = *cmd.getAutoArgs(*state);
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DrvInfos drvInfos;
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getDerivations(*state, *v, "", autoArgs, drvInfos, false);
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std::vector<DerivationInfo> res;
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for (auto & drvInfo : drvInfos) {
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res.push_back({
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state->store->parseStorePath(drvInfo.queryDrvPath()),
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state->store->parseStorePath(drvInfo.queryOutPath()),
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drvInfo.queryOutputName()
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});
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}
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return res;
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}
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Buildables InstallableValue::toBuildables()
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{
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auto state = cmd.getEvalState();
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Buildables res;
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StorePathSet drvPaths;
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for (auto & drv : toDerivations()) {
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Buildable b{.drvPath = drv.drvPath.clone()};
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drvPaths.insert(drv.drvPath.clone());
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auto outputName = drv.outputName;
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if (outputName == "")
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throw Error("derivation '%s' lacks an 'outputName' attribute", state->store->printStorePath(*b.drvPath));
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b.outputs.emplace(outputName, drv.outPath.clone());
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res.push_back(std::move(b));
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}
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// Hack to recognize .all: if all drvs have the same drvPath,
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// merge the buildables.
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if (drvPaths.size() == 1) {
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Buildable b{.drvPath = drvPaths.begin()->clone()};
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for (auto & b2 : res)
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for (auto & output : b2.outputs)
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b.outputs.insert_or_assign(output.first, output.second.clone());
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Buildables bs;
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bs.push_back(std::move(b));
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return bs;
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} else
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return res;
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}
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struct InstallableExpr : InstallableValue
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{
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std::string text;
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InstallableExpr(SourceExprCommand & cmd, const std::string & text)
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: InstallableValue(cmd), text(text) { }
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std::string what() override { return text; }
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std::pair<Value *, Pos> toValue(EvalState & state) override
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{
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auto v = state.allocValue();
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state.eval(state.parseExprFromString(text, absPath(".")), *v);
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return {v, noPos};
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}
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};
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struct InstallableAttrPath : InstallableValue
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{
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RootValue v;
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std::string attrPath;
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InstallableAttrPath(SourceExprCommand & cmd, Value * v, const std::string & attrPath)
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: InstallableValue(cmd), v(allocRootValue(v)), attrPath(attrPath)
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{ }
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std::string what() override { return attrPath; }
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std::pair<Value *, Pos> toValue(EvalState & state) override
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{
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auto [vRes, pos] = findAlongAttrPath(state, attrPath, *cmd.getAutoArgs(state), **v);
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state.forceValue(*vRes);
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return {vRes, pos};
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}
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};
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std::vector<std::string> InstallableFlake::getActualAttrPaths()
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{
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std::vector<std::string> res;
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for (auto & prefix : prefixes)
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res.push_back(prefix + *attrPaths.begin());
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for (auto & s : attrPaths)
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res.push_back(s);
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return res;
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}
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Value * InstallableFlake::getFlakeOutputs(EvalState & state, const flake::LockedFlake & lockedFlake)
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{
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auto vFlake = state.allocValue();
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callFlake(state, lockedFlake, *vFlake);
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auto aOutputs = vFlake->attrs->get(state.symbols.create("outputs"));
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assert(aOutputs);
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state.forceValue(*aOutputs->value);
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return aOutputs->value;
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}
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ref<eval_cache::EvalCache> openEvalCache(
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EvalState & state,
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std::shared_ptr<flake::LockedFlake> lockedFlake,
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bool useEvalCache)
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{
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return ref(std::make_shared<nix::eval_cache::EvalCache>(
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useEvalCache,
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lockedFlake->getFingerprint(),
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state,
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[&state, lockedFlake]()
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{
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/* For testing whether the evaluation cache is
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complete. */
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if (getEnv("NIX_ALLOW_EVAL").value_or("1") == "0")
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throw Error("not everything is cached, but evaluation is not allowed");
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auto vFlake = state.allocValue();
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flake::callFlake(state, *lockedFlake, *vFlake);
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state.forceAttrs(*vFlake);
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auto aOutputs = vFlake->attrs->get(state.symbols.create("outputs"));
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assert(aOutputs);
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return aOutputs->value;
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}));
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}
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std::tuple<std::string, FlakeRef, InstallableValue::DerivationInfo> InstallableFlake::toDerivation()
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{
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auto state = cmd.getEvalState();
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auto lockedFlake = std::make_shared<flake::LockedFlake>(
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lockFlake(*state, flakeRef, cmd.lockFlags));
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auto cache = openEvalCache(*state, lockedFlake, true);
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auto root = cache->getRoot();
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for (auto & attrPath : getActualAttrPaths()) {
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auto attr = root->findAlongAttrPath(parseAttrPath(*state, attrPath));
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if (!attr) continue;
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if (!attr->isDerivation())
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throw Error("flake output attribute '%s' is not a derivation", attrPath);
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auto aDrvPath = attr->getAttr(state->sDrvPath);
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auto drvPath = state->store->parseStorePath(aDrvPath->getString());
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if (!state->store->isValidPath(drvPath) && !settings.readOnlyMode) {
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/* The eval cache contains 'drvPath', but the actual path
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has been garbage-collected. So force it to be
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regenerated. */
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aDrvPath->forceValue();
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if (!state->store->isValidPath(drvPath))
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throw Error("don't know how to recreate store derivation '%s'!",
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state->store->printStorePath(drvPath));
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}
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auto drvInfo = DerivationInfo{
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std::move(drvPath),
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state->store->parseStorePath(attr->getAttr(state->sOutPath)->getString()),
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attr->getAttr(state->sOutputName)->getString()
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};
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return {attrPath, lockedFlake->flake.lockedRef, std::move(drvInfo)};
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}
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throw Error("flake '%s' does not provide attribute %s",
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flakeRef, concatStringsSep(", ", quoteStrings(attrPaths)));
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}
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std::vector<InstallableValue::DerivationInfo> InstallableFlake::toDerivations()
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{
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std::vector<DerivationInfo> res;
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res.push_back(std::get<2>(toDerivation()));
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return res;
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}
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std::pair<Value *, Pos> InstallableFlake::toValue(EvalState & state)
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{
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auto lockedFlake = lockFlake(state, flakeRef, cmd.lockFlags);
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auto vOutputs = getFlakeOutputs(state, lockedFlake);
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auto emptyArgs = state.allocBindings(0);
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for (auto & attrPath : getActualAttrPaths()) {
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try {
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auto [v, pos] = findAlongAttrPath(state, attrPath, *emptyArgs, *vOutputs);
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state.forceValue(*v);
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return {v, pos};
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} catch (AttrPathNotFound & e) {
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}
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}
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throw Error("flake '%s' does not provide attribute %s",
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flakeRef, concatStringsSep(", ", quoteStrings(attrPaths)));
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}
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std::vector<std::pair<std::shared_ptr<eval_cache::AttrCursor>, std::string>>
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InstallableFlake::getCursor(EvalState & state, bool useEvalCache)
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{
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auto evalCache = openEvalCache(state,
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std::make_shared<flake::LockedFlake>(lockFlake(state, flakeRef, cmd.lockFlags)),
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useEvalCache);
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auto root = evalCache->getRoot();
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std::vector<std::pair<std::shared_ptr<eval_cache::AttrCursor>, std::string>> res;
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for (auto & attrPath : getActualAttrPaths()) {
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auto attr = root->findAlongAttrPath(parseAttrPath(state, attrPath));
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if (attr) res.push_back({attr, attrPath});
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}
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return res;
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}
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std::vector<std::shared_ptr<Installable>> SourceExprCommand::parseInstallables(
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ref<Store> store, std::vector<std::string> ss)
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{
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std::vector<std::shared_ptr<Installable>> result;
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if (file || expr) {
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if (file && expr)
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throw UsageError("'--file' and '--expr' are exclusive");
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// FIXME: backward compatibility hack
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if (file) evalSettings.pureEval = false;
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auto state = getEvalState();
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auto vFile = state->allocValue();
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if (file)
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state->evalFile(lookupFileArg(*state, *file), *vFile);
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else {
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auto e = state->parseExprFromString(*expr, absPath("."));
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state->eval(e, *vFile);
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}
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|
|
for (auto & s : ss)
|
|
result.push_back(std::make_shared<InstallableAttrPath>(*this, vFile, s == "." ? "" : s));
|
|
|
|
} else {
|
|
|
|
for (auto & s : ss) {
|
|
std::exception_ptr ex;
|
|
|
|
try {
|
|
auto [flakeRef, fragment] = parseFlakeRefWithFragment(s, absPath("."));
|
|
result.push_back(std::make_shared<InstallableFlake>(
|
|
*this, std::move(flakeRef),
|
|
fragment == "" ? getDefaultFlakeAttrPaths() : Strings{fragment},
|
|
getDefaultFlakeAttrPathPrefixes()));
|
|
continue;
|
|
} catch (...) {
|
|
ex = std::current_exception();
|
|
}
|
|
|
|
if (s.find('/') != std::string::npos) {
|
|
try {
|
|
result.push_back(std::make_shared<InstallableStorePath>(store, store->printStorePath(store->followLinksToStorePath(s))));
|
|
continue;
|
|
} catch (NotInStore &) {
|
|
} catch (...) {
|
|
if (!ex)
|
|
ex = std::current_exception();
|
|
}
|
|
}
|
|
|
|
std::rethrow_exception(ex);
|
|
|
|
/*
|
|
throw Error(
|
|
pathExists(s)
|
|
? "path '%s' is not a flake or a store path"
|
|
: "don't know how to handle argument '%s'", s);
|
|
*/
|
|
}
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
std::shared_ptr<Installable> SourceExprCommand::parseInstallable(
|
|
ref<Store> store, const std::string & installable)
|
|
{
|
|
auto installables = parseInstallables(store, {installable});
|
|
assert(installables.size() == 1);
|
|
return installables.front();
|
|
}
|
|
|
|
Buildables build(ref<Store> store, RealiseMode mode,
|
|
std::vector<std::shared_ptr<Installable>> installables)
|
|
{
|
|
if (mode != Build)
|
|
settings.readOnlyMode = true;
|
|
|
|
Buildables buildables;
|
|
|
|
std::vector<StorePathWithOutputs> pathsToBuild;
|
|
|
|
for (auto & i : installables) {
|
|
for (auto & b : i->toBuildables()) {
|
|
if (b.drvPath) {
|
|
StringSet outputNames;
|
|
for (auto & output : b.outputs)
|
|
outputNames.insert(output.first);
|
|
pathsToBuild.push_back({*b.drvPath, outputNames});
|
|
} else
|
|
for (auto & output : b.outputs)
|
|
pathsToBuild.push_back({output.second.clone()});
|
|
buildables.push_back(std::move(b));
|
|
}
|
|
}
|
|
|
|
if (mode == DryRun)
|
|
printMissing(store, pathsToBuild, lvlError);
|
|
else if (mode == Build)
|
|
store->buildPaths(pathsToBuild);
|
|
|
|
return buildables;
|
|
}
|
|
|
|
StorePathSet toStorePaths(ref<Store> store, RealiseMode mode,
|
|
std::vector<std::shared_ptr<Installable>> installables)
|
|
{
|
|
StorePathSet outPaths;
|
|
|
|
for (auto & b : build(store, mode, installables))
|
|
for (auto & output : b.outputs)
|
|
outPaths.insert(output.second.clone());
|
|
|
|
return outPaths;
|
|
}
|
|
|
|
StorePath toStorePath(ref<Store> store, RealiseMode mode,
|
|
std::shared_ptr<Installable> installable)
|
|
{
|
|
auto paths = toStorePaths(store, mode, {installable});
|
|
|
|
if (paths.size() != 1)
|
|
throw Error("argument '%s' should evaluate to one store path", installable->what());
|
|
|
|
return paths.begin()->clone();
|
|
}
|
|
|
|
StorePathSet toDerivations(ref<Store> store,
|
|
std::vector<std::shared_ptr<Installable>> installables, bool useDeriver)
|
|
{
|
|
StorePathSet drvPaths;
|
|
|
|
for (auto & i : installables)
|
|
for (auto & b : i->toBuildables()) {
|
|
if (!b.drvPath) {
|
|
if (!useDeriver)
|
|
throw Error("argument '%s' did not evaluate to a derivation", i->what());
|
|
for (auto & output : b.outputs) {
|
|
auto derivers = store->queryValidDerivers(output.second);
|
|
if (derivers.empty())
|
|
throw Error("'%s' does not have a known deriver", i->what());
|
|
// FIXME: use all derivers?
|
|
drvPaths.insert(derivers.begin()->clone());
|
|
}
|
|
} else
|
|
drvPaths.insert(b.drvPath->clone());
|
|
}
|
|
|
|
return drvPaths;
|
|
}
|
|
|
|
InstallablesCommand::InstallablesCommand()
|
|
{
|
|
expectArgs({
|
|
.label = "installables",
|
|
.handler = {&_installables},
|
|
.completer = {[&](size_t, std::string_view prefix) {
|
|
completeInstallable(prefix);
|
|
}}
|
|
});
|
|
}
|
|
|
|
void InstallablesCommand::prepare()
|
|
{
|
|
if (_installables.empty() && useDefaultInstallables())
|
|
// FIXME: commands like "nix install" should not have a
|
|
// default, probably.
|
|
_installables.push_back(".");
|
|
installables = parseInstallables(getStore(), _installables);
|
|
}
|
|
|
|
InstallableCommand::InstallableCommand()
|
|
{
|
|
expectArgs({
|
|
.label = "installable",
|
|
.handler = {&_installable},
|
|
.completer = {[&](size_t, std::string_view prefix) {
|
|
completeInstallable(prefix);
|
|
}}
|
|
});
|
|
}
|
|
|
|
void InstallableCommand::prepare()
|
|
{
|
|
installable = parseInstallable(getStore(), _installable);
|
|
}
|
|
|
|
}
|