lix/src/nix/installables.cc

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