lix/src/nix/flake.cc

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#include "command.hh"
#include "common-args.hh"
#include "shared.hh"
#include "progress-bar.hh"
#include "eval.hh"
#include "eval-inline.hh"
#include "flake/flake.hh"
#include "get-drvs.hh"
#include "store-api.hh"
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#include "derivations.hh"
#include "attr-path.hh"
#include "fetchers/fetchers.hh"
#include "fetchers/registry.hh"
#include "json.hh"
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#include <nlohmann/json.hpp>
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#include <queue>
#include <iomanip>
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using namespace nix;
using namespace nix::flake;
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class FlakeCommand : virtual Args, public EvalCommand, public MixFlakeOptions
{
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std::string flakeUrl = ".";
public:
FlakeCommand()
{
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expectArg("flake-url", &flakeUrl, true);
}
FlakeRef getFlakeRef()
{
return parseFlakeRef(flakeUrl, absPath(".")); //FIXME
}
Flake getFlake()
{
auto evalState = getEvalState();
return flake::getFlake(*evalState, getFlakeRef(), lockFlags.useRegistries);
}
LockedFlake lockFlake()
{
return flake::lockFlake(*getEvalState(), getFlakeRef(), lockFlags);
}
};
struct CmdFlakeList : EvalCommand
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{
std::string description() override
{
return "list available Nix flakes";
}
void run(nix::ref<nix::Store> store) override
{
using namespace fetchers;
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auto registries = getRegistries(store);
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stopProgressBar();
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for (auto & registry : registries) {
for (auto & entry : registry->entries) {
// FIXME: format nicely
std::cout << fmt("%s %s %s\n",
registry->type == Registry::Flag ? "flags " :
registry->type == Registry::User ? "user " :
"global",
entry.first->to_string(),
entry.second->to_string());
}
}
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}
};
static void printFlakeInfo(const Store & store, const Flake & flake)
{
std::cout << fmt("URL: %s\n", flake.resolvedRef.input->to_string());
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std::cout << fmt("Edition: %s\n", flake.edition);
if (flake.description)
std::cout << fmt("Description: %s\n", *flake.description);
std::cout << fmt("Path: %s\n", store.printStorePath(flake.sourceInfo->storePath));
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if (auto rev = flake.resolvedRef.input->getRev())
std::cout << fmt("Revision: %s\n", rev->to_string(Base16, false));
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if (flake.sourceInfo->info.revCount)
std::cout << fmt("Revisions: %s\n", *flake.sourceInfo->info.revCount);
if (flake.sourceInfo->info.lastModified)
std::cout << fmt("Last modified: %s\n",
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std::put_time(std::localtime(&*flake.sourceInfo->info.lastModified), "%F %T"));
}
static nlohmann::json flakeToJson(const Store & store, const Flake & flake)
{
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nlohmann::json j;
if (flake.description)
j["description"] = *flake.description;
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j["edition"] = flake.edition;
j["url"] = flake.resolvedRef.input->to_string();
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if (auto rev = flake.resolvedRef.input->getRev())
j["revision"] = rev->to_string(Base16, false);
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if (flake.sourceInfo->info.revCount)
j["revCount"] = *flake.sourceInfo->info.revCount;
if (flake.sourceInfo->info.lastModified)
j["lastModified"] = *flake.sourceInfo->info.lastModified;
j["path"] = store.printStorePath(flake.sourceInfo->storePath);
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return j;
}
struct CmdFlakeUpdate : FlakeCommand
{
std::string description() override
{
return "update flake lock file";
}
void run(nix::ref<nix::Store> store) override
{
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/* Use --refresh by default for 'nix flake update'. */
settings.tarballTtl = 0;
lockFlake();
}
};
static void enumerateOutputs(EvalState & state, Value & vFlake,
std::function<void(const std::string & name, Value & vProvide, const Pos & pos)> callback)
{
state.forceAttrs(vFlake);
auto aOutputs = vFlake.attrs->get(state.symbols.create("outputs"));
assert(aOutputs);
state.forceAttrs(*(*aOutputs)->value);
for (auto & attr : *((*aOutputs)->value->attrs))
callback(attr.name, *attr.value, *attr.pos);
}
struct CmdFlakeInfo : FlakeCommand, MixJSON
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{
std::string description() override
{
return "list info about a given flake";
}
void run(nix::ref<nix::Store> store) override
{
if (json) {
auto state = getEvalState();
auto flake = lockFlake();
auto json = flakeToJson(*store, flake.flake);
auto vFlake = state->allocValue();
flake::callFlake(*state, flake, *vFlake);
auto outputs = nlohmann::json::object();
enumerateOutputs(*state,
*vFlake,
[&](const std::string & name, Value & vProvide, const Pos & pos) {
auto provide = nlohmann::json::object();
if (name == "checks" || name == "packages") {
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state->forceAttrs(vProvide, pos);
for (auto & aCheck : *vProvide.attrs)
provide[aCheck.name] = nlohmann::json::object();
}
outputs[name] = provide;
});
json["outputs"] = std::move(outputs);
std::cout << json.dump() << std::endl;
} else {
auto flake = getFlake();
stopProgressBar();
printFlakeInfo(*store, flake);
}
}
};
struct CmdFlakeListInputs : FlakeCommand, MixJSON
{
std::string description() override
{
return "list flake inputs";
}
void run(nix::ref<nix::Store> store) override
{
auto flake = lockFlake();
stopProgressBar();
if (json)
std::cout << ((LockedInputs &) flake.lockFile).toJson() << "\n";
else {
std::cout << fmt("%s\n", flake.flake.resolvedRef);
std::function<void(const LockedInputs & inputs, const std::string & prefix)> recurse;
recurse = [&](const LockedInputs & inputs, const std::string & prefix)
{
for (const auto & [i, input] : enumerate(inputs.inputs)) {
//auto tree2 = tree.child(i + 1 == inputs.inputs.size());
bool last = i + 1 == inputs.inputs.size();
std::cout << fmt("%s" ANSI_BOLD "%s" ANSI_NORMAL ": %s\n",
prefix + (last ? treeLast : treeConn), input.first, input.second.ref);
recurse(input.second, prefix + (last ? treeNull : treeLine));
}
};
recurse(flake.lockFile, "");
}
}
};
struct CmdFlakeCheck : FlakeCommand
{
bool build = true;
CmdFlakeCheck()
{
mkFlag()
.longName("no-build")
.description("do not build checks")
.set(&build, false);
}
std::string description() override
{
return "check whether the flake evaluates and run its tests";
}
void run(nix::ref<nix::Store> store) override
{
settings.readOnlyMode = !build;
auto state = getEvalState();
auto flake = lockFlake();
auto checkSystemName = [&](const std::string & system, const Pos & pos) {
// FIXME: what's the format of "system"?
if (system.find('-') == std::string::npos)
throw Error("'%s' is not a valid system type, at %s", system, pos);
};
auto checkDerivation = [&](const std::string & attrPath, Value & v, const Pos & pos) {
try {
auto drvInfo = getDerivation(*state, v, false);
if (!drvInfo)
throw Error("flake attribute '%s' is not a derivation", attrPath);
// FIXME: check meta attributes
return store->parseStorePath(drvInfo->queryDrvPath());
} catch (Error & e) {
e.addPrefix(fmt("while checking the derivation '" ANSI_BOLD "%s" ANSI_NORMAL "' at %s:\n", attrPath, pos));
throw;
}
};
std::vector<StorePathWithOutputs> drvPaths;
auto checkApp = [&](const std::string & attrPath, Value & v, const Pos & pos) {
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try {
auto app = App(*state, v);
for (auto & i : app.context) {
auto [drvPathS, outputName] = decodeContext(i);
auto drvPath = store->parseStorePath(drvPathS);
if (!outputName.empty() && drvPath.isDerivation())
drvPaths.emplace_back(drvPath);
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}
} catch (Error & e) {
e.addPrefix(fmt("while checking the app definition '" ANSI_BOLD "%s" ANSI_NORMAL "' at %s:\n", attrPath, pos));
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throw;
}
};
auto checkOverlay = [&](const std::string & attrPath, Value & v, const Pos & pos) {
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try {
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state->forceValue(v, pos);
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if (v.type != tLambda || v.lambda.fun->matchAttrs || std::string(v.lambda.fun->arg) != "final")
throw Error("overlay does not take an argument named 'final'");
auto body = dynamic_cast<ExprLambda *>(v.lambda.fun->body);
if (!body || body->matchAttrs || std::string(body->arg) != "prev")
throw Error("overlay does not take an argument named 'prev'");
// FIXME: if we have a 'nixpkgs' input, use it to
// evaluate the overlay.
} catch (Error & e) {
e.addPrefix(fmt("while checking the overlay '" ANSI_BOLD "%s" ANSI_NORMAL "' at %s:\n", attrPath, pos));
throw;
}
};
auto checkModule = [&](const std::string & attrPath, Value & v, const Pos & pos) {
try {
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state->forceValue(v, pos);
if (v.type == tLambda) {
if (!v.lambda.fun->matchAttrs || !v.lambda.fun->formals->ellipsis)
throw Error("module must match an open attribute set ('{ config, ... }')");
} else if (v.type == tAttrs) {
for (auto & attr : *v.attrs)
try {
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state->forceValue(*attr.value, *attr.pos);
} catch (Error & e) {
e.addPrefix(fmt("while evaluating the option '" ANSI_BOLD "%s" ANSI_NORMAL "' at %s:\n", attr.name, *attr.pos));
throw;
}
} else
throw Error("module must be a function or an attribute set");
// FIXME: if we have a 'nixpkgs' input, use it to
// check the module.
} catch (Error & e) {
e.addPrefix(fmt("while checking the NixOS module '" ANSI_BOLD "%s" ANSI_NORMAL "' at %s:\n", attrPath, pos));
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throw;
}
};
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std::function<void(const std::string & attrPath, Value & v, const Pos & pos)> checkHydraJobs;
checkHydraJobs = [&](const std::string & attrPath, Value & v, const Pos & pos) {
try {
state->forceAttrs(v, pos);
if (state->isDerivation(v))
throw Error("jobset should not be a derivation at top-level");
for (auto & attr : *v.attrs) {
state->forceAttrs(*attr.value, *attr.pos);
if (!state->isDerivation(*attr.value))
checkHydraJobs(attrPath + "." + (std::string) attr.name,
*attr.value, *attr.pos);
}
} catch (Error & e) {
e.addPrefix(fmt("while checking the Hydra jobset '" ANSI_BOLD "%s" ANSI_NORMAL "' at %s:\n", attrPath, pos));
throw;
}
};
auto checkNixOSConfiguration = [&](const std::string & attrPath, Value & v, const Pos & pos) {
try {
Activity act(*logger, lvlChatty, actUnknown,
fmt("checking NixOS configuration '%s'", attrPath));
Bindings & bindings(*state->allocBindings(0));
auto vToplevel = findAlongAttrPath(*state, "config.system.build.toplevel", bindings, v);
state->forceAttrs(*vToplevel, pos);
if (!state->isDerivation(*vToplevel))
throw Error("attribute 'config.system.build.toplevel' is not a derivation");
} catch (Error & e) {
e.addPrefix(fmt("while checking the NixOS configuration '" ANSI_BOLD "%s" ANSI_NORMAL "' at %s:\n", attrPath, pos));
throw;
}
};
{
Activity act(*logger, lvlInfo, actUnknown, "evaluating flake");
auto vFlake = state->allocValue();
flake::callFlake(*state, flake, *vFlake);
enumerateOutputs(*state,
*vFlake,
[&](const std::string & name, Value & vOutput, const Pos & pos) {
Activity act(*logger, lvlChatty, actUnknown,
fmt("checking flake output '%s'", name));
try {
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state->forceValue(vOutput, pos);
if (name == "checks") {
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state->forceAttrs(vOutput, pos);
for (auto & attr : *vOutput.attrs) {
checkSystemName(attr.name, *attr.pos);
state->forceAttrs(*attr.value, *attr.pos);
for (auto & attr2 : *attr.value->attrs) {
auto drvPath = checkDerivation(
fmt("%s.%s.%s", name, attr.name, attr2.name),
*attr2.value, *attr2.pos);
if ((std::string) attr.name == settings.thisSystem.get())
drvPaths.emplace_back(drvPath);
}
}
}
else if (name == "packages") {
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state->forceAttrs(vOutput, pos);
for (auto & attr : *vOutput.attrs) {
checkSystemName(attr.name, *attr.pos);
state->forceAttrs(*attr.value, *attr.pos);
for (auto & attr2 : *attr.value->attrs)
checkDerivation(
fmt("%s.%s.%s", name, attr.name, attr2.name),
*attr2.value, *attr2.pos);
}
}
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else if (name == "apps") {
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state->forceAttrs(vOutput, pos);
for (auto & attr : *vOutput.attrs) {
checkSystemName(attr.name, *attr.pos);
state->forceAttrs(*attr.value, *attr.pos);
for (auto & attr2 : *attr.value->attrs)
checkApp(
fmt("%s.%s.%s", name, attr.name, attr2.name),
*attr2.value, *attr2.pos);
}
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}
else if (name == "defaultPackage" || name == "devShell") {
state->forceAttrs(vOutput, pos);
for (auto & attr : *vOutput.attrs) {
checkSystemName(attr.name, *attr.pos);
checkDerivation(
fmt("%s.%s", name, attr.name),
*attr.value, *attr.pos);
}
}
else if (name == "defaultApp") {
state->forceAttrs(vOutput, pos);
for (auto & attr : *vOutput.attrs) {
checkSystemName(attr.name, *attr.pos);
checkApp(
fmt("%s.%s", name, attr.name),
*attr.value, *attr.pos);
}
}
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else if (name == "legacyPackages") {
state->forceAttrs(vOutput, pos);
for (auto & attr : *vOutput.attrs) {
checkSystemName(attr.name, *attr.pos);
// FIXME: do getDerivations?
}
}
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else if (name == "overlay")
checkOverlay(name, vOutput, pos);
else if (name == "overlays") {
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state->forceAttrs(vOutput, pos);
for (auto & attr : *vOutput.attrs)
checkOverlay(fmt("%s.%s", name, attr.name),
*attr.value, *attr.pos);
}
else if (name == "nixosModule")
checkModule(name, vOutput, pos);
else if (name == "nixosModules") {
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state->forceAttrs(vOutput, pos);
for (auto & attr : *vOutput.attrs)
checkModule(fmt("%s.%s", name, attr.name),
*attr.value, *attr.pos);
}
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else if (name == "nixosConfigurations") {
state->forceAttrs(vOutput, pos);
for (auto & attr : *vOutput.attrs)
checkNixOSConfiguration(fmt("%s.%s", name, attr.name),
*attr.value, *attr.pos);
}
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else if (name == "hydraJobs")
checkHydraJobs(name, vOutput, pos);
else
warn("unknown flake output '%s'", name);
} catch (Error & e) {
e.addPrefix(fmt("while checking flake output '" ANSI_BOLD "%s" ANSI_NORMAL "':\n", name));
throw;
}
});
}
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if (build && !drvPaths.empty()) {
Activity act(*logger, lvlInfo, actUnknown, "running flake checks");
store->buildPaths(drvPaths);
}
}
};
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struct CmdFlakeAdd : MixEvalArgs, Command
{
std::string fromUrl, toUrl;
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std::string description() override
{
return "upsert flake in user flake registry";
}
CmdFlakeAdd()
{
expectArg("from-url", &fromUrl);
expectArg("to-url", &toUrl);
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}
void run() override
{
auto fromRef = parseFlakeRef(fromUrl);
auto toRef = parseFlakeRef(toUrl);
auto userRegistry = fetchers::getUserRegistry();
userRegistry->remove(fromRef.input);
userRegistry->add(fromRef.input, toRef.input);
userRegistry->write(fetchers::getUserRegistryPath());
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}
};
struct CmdFlakeRemove : virtual Args, MixEvalArgs, Command
{
std::string url;
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std::string description() override
{
return "remove flake from user flake registry";
}
CmdFlakeRemove()
{
expectArg("url", &url);
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}
void run() override
{
auto userRegistry = fetchers::getUserRegistry();
userRegistry->remove(parseFlakeRef(url).input);
userRegistry->write(fetchers::getUserRegistryPath());
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}
};
struct CmdFlakePin : virtual Args, EvalCommand
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{
std::string url;
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std::string description() override
{
return "pin a flake to its current version in user flake registry";
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}
CmdFlakePin()
{
expectArg("url", &url);
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}
void run(nix::ref<nix::Store> store) override
{
auto ref = parseFlakeRef(url);
auto userRegistry = fetchers::getUserRegistry();
userRegistry->remove(ref.input);
auto [tree, resolved] = ref.resolve(store).input->fetchTree(store);
userRegistry->add(ref.input, resolved);
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}
};
struct CmdFlakeInit : virtual Args, Command
{
std::string description() override
{
return "create a skeleton 'flake.nix' file in the current directory";
}
void run() override
{
Path flakeDir = absPath(".");
if (!pathExists(flakeDir + "/.git"))
throw Error("the directory '%s' is not a Git repository", flakeDir);
Path flakePath = flakeDir + "/flake.nix";
if (pathExists(flakePath))
throw Error("file '%s' already exists", flakePath);
writeFile(flakePath,
#include "flake-template.nix.gen.hh"
);
}
};
struct CmdFlakeClone : FlakeCommand
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{
Path destDir;
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std::string description() override
{
return "clone flake repository";
}
CmdFlakeClone()
{
mkFlag()
.shortName('f')
.longName("dest")
.label("path")
.description("destination path")
.dest(&destDir);
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}
void run(nix::ref<nix::Store> store) override
{
if (destDir.empty())
throw Error("missing flag '--dest'");
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getFlakeRef().resolve(store).input->clone(destDir);
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}
};
struct CmdFlakeArchive : FlakeCommand, MixJSON, MixDryRun
{
std::string dstUri;
CmdFlakeArchive()
{
mkFlag()
.longName("to")
.labels({"store-uri"})
.description("URI of the destination Nix store")
.dest(&dstUri);
}
std::string description() override
{
return "copy a flake and all its inputs to a store";
}
Examples examples() override
{
return {
Example{
"To copy the dwarffs flake and its dependencies to a binary cache:",
"nix flake archive --to file:///tmp/my-cache dwarffs"
},
Example{
"To fetch the dwarffs flake and its dependencies to the local Nix store:",
"nix flake archive dwarffs"
},
Example{
"To print the store paths of the flake sources of NixOps without fetching them:",
"nix flake archive --json --dry-run nixops"
},
};
}
void run(nix::ref<nix::Store> store) override
{
auto flake = lockFlake();
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auto jsonRoot = json ? std::optional<JSONObject>(std::cout) : std::nullopt;
StorePathSet sources;
sources.insert(flake.flake.sourceInfo->storePath.clone());
if (jsonRoot)
jsonRoot->attr("path", store->printStorePath(flake.flake.sourceInfo->storePath));
std::function<void(const LockedInputs & inputs, std::optional<JSONObject> & jsonObj)> traverse;
traverse = [&](const LockedInputs & inputs, std::optional<JSONObject> & jsonObj)
{
auto jsonObj2 = jsonObj ? jsonObj->object("inputs") : std::optional<JSONObject>();
for (auto & input : inputs.inputs) {
auto jsonObj3 = jsonObj2 ? jsonObj2->object(input.first) : std::optional<JSONObject>();
if (!dryRun)
input.second.ref.input->fetchTree(store);
auto storePath = input.second.computeStorePath(*store);
if (jsonObj3)
jsonObj3->attr("path", store->printStorePath(storePath));
sources.insert(std::move(storePath));
traverse(input.second, jsonObj3);
}
};
traverse(flake.lockFile, jsonRoot);
if (!dryRun && !dstUri.empty()) {
ref<Store> dstStore = dstUri.empty() ? openStore() : openStore(dstUri);
copyPaths(store, dstStore, sources);
}
}
};
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struct CmdFlake : virtual MultiCommand, virtual Command
{
CmdFlake()
: MultiCommand({
{"list", []() { return make_ref<CmdFlakeList>(); }},
{"update", []() { return make_ref<CmdFlakeUpdate>(); }},
{"info", []() { return make_ref<CmdFlakeInfo>(); }},
{"list-inputs", []() { return make_ref<CmdFlakeListInputs>(); }},
{"check", []() { return make_ref<CmdFlakeCheck>(); }},
{"add", []() { return make_ref<CmdFlakeAdd>(); }},
{"remove", []() { return make_ref<CmdFlakeRemove>(); }},
{"pin", []() { return make_ref<CmdFlakePin>(); }},
{"init", []() { return make_ref<CmdFlakeInit>(); }},
{"clone", []() { return make_ref<CmdFlakeClone>(); }},
{"archive", []() { return make_ref<CmdFlakeArchive>(); }},
})
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{
}
std::string description() override
{
return "manage Nix flakes";
}
void run() override
{
if (!command)
throw UsageError("'nix flake' requires a sub-command.");
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command->prepare();
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command->run();
}
void printHelp(const string & programName, std::ostream & out) override
{
MultiCommand::printHelp(programName, out);
}
};
static auto r1 = registerCommand<CmdFlake>("flake");