lix/src/libcmd/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>
#include <nlohmann/json.hpp>
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->add(input.first);
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}
MixFlakeOptions::MixFlakeOptions()
{
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auto category = "Common flake-related options";
addFlag({
.longName = "recreate-lock-file",
.description = "Recreate the flake's lock file from scratch.",
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.category = category,
.handler = {&lockFlags.recreateLockFile, true}
});
addFlag({
.longName = "no-update-lock-file",
.description = "Do not allow any updates to the flake's lock file.",
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.category = category,
.handler = {&lockFlags.updateLockFile, false}
});
addFlag({
.longName = "no-write-lock-file",
.description = "Do not write the flake's newly generated lock file.",
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.category = category,
.handler = {&lockFlags.writeLockFile, false}
});
addFlag({
.longName = "no-registries",
.description = "Don't allow lookups in the flake registries.",
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.category = category,
.handler = {&lockFlags.useRegistries, false}
});
addFlag({
.longName = "commit-lock-file",
.description = "Commit changes to the flake's lock file.",
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.category = category,
.handler = {&lockFlags.commitLockFile, true}
});
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addFlag({
.longName = "update-input",
.description = "Update a specific flake input (ignoring its previous entry in the lock file).",
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.category = category,
.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`). This implies `--no-write-lock-file`.",
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.category = category,
.labels = {"input-path", "flake-url"},
.handler = {[&](std::string inputPath, std::string flakeRef) {
lockFlags.writeLockFile = false;
lockFlags.inputOverrides.insert_or_assign(
flake::parseInputPath(inputPath),
parseFlakeRef(flakeRef, absPath(".")));
}}
});
addFlag({
.longName = "inputs-from",
.description = "Use the inputs of the specified flake as registry entries.",
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.category = category,
.labels = {"flake-url"},
.handler = {[&](std::string flakeRef) {
auto evalState = getEvalState();
auto flake = flake::lockFlake(
*evalState,
parseFlakeRef(flakeRef, absPath(".")),
{ .writeLockFile = false });
for (auto & [inputName, input] : flake.lockFile.root->inputs) {
auto input2 = flake.lockFile.findInput({inputName}); // resolve 'follows' nodes
if (auto input3 = std::dynamic_pointer_cast<const flake::LockedNode>(input2)) {
overrideRegistry(
fetchers::Input::fromAttrs({{"type","indirect"}, {"id", inputName}}),
input3->lockedRef.input,
{});
}
}
}},
.completer = {[&](size_t, std::string_view prefix) {
completeFlakeRef(getEvalState()->store, prefix);
}}
});
}
SourceExprCommand::SourceExprCommand()
{
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addFlag({
.longName = "file",
.shortName = 'f',
.description = "Interpret installables as attribute paths relative to the Nix expression stored in *file*.",
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.category = installablesCategory,
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.labels = {"file"},
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.handler = {&file},
.completer = completePath
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});
addFlag({
.longName = "expr",
.description = "Interpret installables as attribute paths relative to the Nix expression *expr*.",
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.category = installablesCategory,
.labels = {"expr"},
.handler = {&expr}
});
addFlag({
.longName = "derivation",
.description = "Operate on the store derivation rather than its outputs.",
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.category = installablesCategory,
.handler = {&operateOn, OperateOn::Derivation},
});
}
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,
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std::make_shared<flake::LockedFlake>(lockFlake(*evalState, flakeRef, lockFlags)));
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->add(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->add(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);
}
EvalCommand::~EvalCommand()
{
if (evalState)
evalState->printStats();
}
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void completeFlakeRef(ref<Store> store, std::string_view prefix)
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{
if (prefix == "")
completions->add(".");
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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->add(from2);
} else {
if (hasPrefix(from, prefix))
completions->add(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]);
}
std::vector<std::pair<std::shared_ptr<eval_cache::AttrCursor>, std::string>>
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Installable::getCursors(EvalState & state)
{
auto evalCache =
std::make_shared<nix::eval_cache::EvalCache>(std::nullopt, state,
[&]() { return toValue(state).first; });
return {{evalCache->getRoot(), ""}};
}
std::pair<std::shared_ptr<eval_cache::AttrCursor>, std::string>
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Installable::getCursor(EvalState & state)
{
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auto cursors = getCursors(state);
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, StorePath && storePath)
: store(store), storePath(std::move(storePath)) { }
std::string what() override { return store->printStorePath(storePath); }
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Buildables toBuildables() override
{
if (storePath.isDerivation()) {
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std::map<std::string, std::optional<StorePath>> outputs;
auto drv = store->readDerivation(storePath);
for (auto & [name, output] : drv.outputsAndOptPaths(*store))
outputs.emplace(name, output.second);
return {
BuildableFromDrv {
.drvPath = storePath,
.outputs = std::move(outputs)
}
};
} else {
return {
BuildableOpaque {
.path = storePath,
}
};
}
}
std::optional<StorePath> getStorePath() override
{
return storePath;
}
};
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Buildables InstallableValue::toBuildables()
{
Buildables res;
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std::map<StorePath, std::map<std::string, std::optional<StorePath>>> drvsToOutputs;
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// Group by derivation, helps with .all in particular
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for (auto & drv : toDerivations()) {
auto outputName = drv.outputName;
if (outputName == "")
throw Error("derivation '%s' lacks an 'outputName' attribute", state->store->printStorePath(drv.drvPath));
drvsToOutputs[drv.drvPath].insert_or_assign(outputName, drv.outPath);
}
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for (auto & i : drvsToOutputs)
res.push_back(BuildableFromDrv { i.first, i.second });
return res;
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}
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->maybeParseStorePath(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,
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std::shared_ptr<flake::LockedFlake> lockedFlake)
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{
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auto fingerprint = lockedFlake->getFingerprint();
return make_ref<nix::eval_cache::EvalCache>(
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evalSettings.useEvalCache && evalSettings.pureEval
? std::optional { std::cref(fingerprint) }
: std::nullopt,
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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;
});
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}
static std::string showAttrPaths(const std::vector<std::string> & paths)
{
std::string s;
for (const auto & [n, i] : enumerate(paths)) {
if (n > 0) s += n + 1 == paths.size() ? " or " : ", ";
s += '\''; s += i; s += '\'';
}
return s;
}
InstallableFlake::InstallableFlake(
SourceExprCommand * cmd,
ref<EvalState> state,
FlakeRef && flakeRef,
Strings && attrPaths,
Strings && prefixes,
const flake::LockFlags & lockFlags)
: InstallableValue(state),
flakeRef(flakeRef),
attrPaths(attrPaths),
prefixes(prefixes),
lockFlags(lockFlags)
{
if (cmd && cmd->getAutoArgs(*state)->size())
throw UsageError("'--arg' and '--argstr' are incompatible with flakes");
}
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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);
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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));
if (!attr) continue;
if (!attr->isDerivation())
throw Error("flake output attribute '%s' is not a derivation", attrPath);
auto drvPath = attr->forceDerivation();
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auto drvInfo = DerivationInfo{
std::move(drvPath),
state->store->maybeParseStorePath(attr->getAttr(state->sOutPath)->getString()),
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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, showAttrPaths(getActualAttrPaths()));
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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;
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, showAttrPaths(getActualAttrPaths()));
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}
std::vector<std::pair<std::shared_ptr<eval_cache::AttrCursor>, std::string>>
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InstallableFlake::getCursors(EvalState & state)
{
auto evalCache = openEvalCache(state,
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std::make_shared<flake::LockedFlake>(lockFlake(state, flakeRef, lockFlags)));
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));
_lockedFlake->flake.config.apply();
// FIXME: send new config to the daemon.
}
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>(
this,
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->followLinksToStorePath(s)));
continue;
} catch (BadStorePath &) {
} 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, Realise mode,
std::vector<std::shared_ptr<Installable>> installables, BuildMode bMode)
{
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if (mode == Realise::Nothing)
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()) {
std::visit(overloaded {
[&](BuildableOpaque bo) {
pathsToBuild.push_back({bo.path});
},
[&](BuildableFromDrv bfd) {
StringSet outputNames;
for (auto & output : bfd.outputs)
outputNames.insert(output.first);
pathsToBuild.push_back({bfd.drvPath, outputNames});
},
}, b);
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buildables.push_back(std::move(b));
}
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}
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if (mode == Realise::Nothing)
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printMissing(store, pathsToBuild, lvlError);
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else if (mode == Realise::Outputs)
store->buildPaths(pathsToBuild, bMode);
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return buildables;
}
std::set<RealisedPath> toRealisedPaths(
ref<Store> store,
Realise mode,
OperateOn operateOn,
std::vector<std::shared_ptr<Installable>> installables)
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{
std::set<RealisedPath> res;
if (operateOn == OperateOn::Output) {
for (auto & b : build(store, mode, installables))
std::visit(overloaded {
[&](BuildableOpaque bo) {
res.insert(bo.path);
},
[&](BuildableFromDrv bfd) {
auto drv = store->readDerivation(bfd.drvPath);
auto outputHashes = staticOutputHashes(*store, drv);
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for (auto & output : bfd.outputs) {
if (settings.isExperimentalFeatureEnabled("ca-derivations")) {
if (!outputHashes.count(output.first))
throw Error(
"the derivation '%s' doesn't have an output named '%s'",
store->printStorePath(bfd.drvPath),
output.first);
auto outputId = DrvOutput{outputHashes.at(output.first), output.first};
auto realisation = store->queryRealisation(outputId);
if (!realisation)
throw Error("cannot operate on an output of unbuilt content-addresed derivation '%s'", outputId.to_string());
res.insert(RealisedPath{*realisation});
}
else {
// If ca-derivations isn't enabled, behave as if
// all the paths are opaque to keep the default
// behavior
assert(output.second);
res.insert(*output.second);
}
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}
},
}, b);
} else {
if (mode == Realise::Nothing)
settings.readOnlyMode = true;
for (auto & i : installables)
for (auto & b : i->toBuildables())
if (auto bfd = std::get_if<BuildableFromDrv>(&b))
res.insert(bfd->drvPath);
}
return res;
}
StorePathSet toStorePaths(ref<Store> store,
Realise mode, OperateOn operateOn,
std::vector<std::shared_ptr<Installable>> installables)
{
StorePathSet outPaths;
for (auto & path : toRealisedPaths(store, mode, operateOn, installables))
outPaths.insert(path.path());
return outPaths;
}
StorePath toStorePath(ref<Store> store,
Realise mode, OperateOn operateOn,
std::shared_ptr<Installable> installable)
{
auto paths = toStorePaths(store, mode, operateOn, {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())
std::visit(overloaded {
[&](BuildableOpaque bo) {
if (!useDeriver)
throw Error("argument '%s' did not evaluate to a derivation", i->what());
auto derivers = store->queryValidDerivers(bo.path);
if (derivers.empty())
throw Error("'%s' does not have a known deriver", i->what());
// FIXME: use all derivers?
drvPaths.insert(*derivers.begin());
},
[&](BuildableFromDrv bfd) {
drvPaths.insert(bfd.drvPath);
},
}, b);
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);
}
}