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 <nlohmann/json.hpp>
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#include <queue>
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using namespace nix;
struct CmdFlakeList : StoreCommand, MixEvalArgs
{
std::string name() override
{
return "list";
}
std::string description() override
{
return "list available Nix flakes";
}
void run(nix::ref<nix::Store> store) override
{
auto evalState = std::make_shared<EvalState>(searchPath, store);
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auto registries = evalState->getFlakeRegistries();
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stopProgressBar();
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for (auto & registry : registries)
for (auto & entry : registry->entries)
std::cout << entry.first.to_string() << " " << entry.second.to_string() << "\n";
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}
};
void printFlakeInfo(Flake & flake, bool json) {
if (json) {
nlohmann::json j;
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j["id"] = flake.id;
j["location"] = flake.path;
j["description"] = flake.description;
std::cout << j.dump(4) << std::endl;
} else {
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std::cout << "ID: " << flake.id << "\n";
std::cout << "Description: " << flake.description << "\n";
std::cout << "Location: " << flake.path << "\n";
}
}
void printNonFlakeInfo(NonFlake & nonFlake, bool json) {
if (json) {
nlohmann::json j;
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j["name"] = nonFlake.alias;
j["location"] = nonFlake.path;
std::cout << j.dump(4) << std::endl;
} else {
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std::cout << "name: " << nonFlake.alias << "\n";
std::cout << "Location: " << nonFlake.path << "\n";
}
}
struct CmdFlakeDeps : FlakeCommand, MixJSON, StoreCommand, MixEvalArgs
{
std::string name() override
{
return "deps";
}
std::string description() override
{
return "list informaton about dependencies";
}
void run(nix::ref<nix::Store> store) override
{
auto evalState = std::make_shared<EvalState>(searchPath, store);
FlakeRef flakeRef(flakeUri);
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Dependencies deps = resolveFlake(*evalState, flakeRef, true);
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std::queue<Dependencies> todo;
todo.push(deps);
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while (!todo.empty()) {
deps = todo.front();
todo.pop();
for (auto & nonFlake : deps.nonFlakeDeps)
printNonFlakeInfo(nonFlake, json);
for (auto & newDeps : deps.flakeDeps)
todo.push(newDeps);
}
}
};
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struct CmdFlakeUpdate : StoreCommand, GitRepoCommand, MixEvalArgs
{
std::string name() override
{
return "update";
}
std::string description() override
{
return "update flake lock file";
}
void run(nix::ref<nix::Store> store) override
{
auto evalState = std::make_shared<EvalState>(searchPath, store);
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if (gitPath == "") gitPath = absPath(".");
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updateLockFile(*evalState, gitPath);
}
};
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struct CmdFlakeInfo : FlakeCommand, MixJSON, MixEvalArgs, StoreCommand
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{
std::string name() override
{
return "info";
}
std::string description() override
{
return "list info about a given flake";
}
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CmdFlakeInfo () { evalSettings.pureEval = false; }
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void run(nix::ref<nix::Store> store) override
{
auto evalState = std::make_shared<EvalState>(searchPath, store);
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nix::Flake flake = nix::getFlake(*evalState, FlakeRef(flakeUri), true);
printFlakeInfo(flake, json);
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}
};
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struct CmdFlakeAdd : MixEvalArgs, Command
{
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FlakeUri alias;
FlakeUri uri;
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std::string name() override
{
return "add";
}
std::string description() override
{
return "upsert flake in user flake registry";
}
CmdFlakeAdd()
{
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expectArg("alias", &alias);
expectArg("flake-uri", &uri);
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evalSettings.pureEval = false;
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}
void run() override
{
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FlakeRef aliasRef(alias);
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Path userRegistryPath = getUserRegistryPath();
auto userRegistry = readRegistry(userRegistryPath);
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userRegistry->entries.erase(aliasRef);
userRegistry->entries.insert_or_assign(aliasRef, FlakeRef(uri));
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writeRegistry(*userRegistry, userRegistryPath);
}
};
struct CmdFlakeRemove : virtual Args, MixEvalArgs, Command
{
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FlakeUri alias;
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std::string name() override
{
return "remove";
}
std::string description() override
{
return "remove flake from user flake registry";
}
CmdFlakeRemove()
{
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expectArg("alias", &alias);
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evalSettings.pureEval = false;
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}
void run() override
{
Path userRegistryPath = getUserRegistryPath();
auto userRegistry = readRegistry(userRegistryPath);
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userRegistry->entries.erase(FlakeRef(alias));
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writeRegistry(*userRegistry, userRegistryPath);
}
};
struct CmdFlakePin : virtual Args, StoreCommand, MixEvalArgs
{
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FlakeUri alias;
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std::string name() override
{
return "pin";
}
std::string description() override
{
return "pin flake require in user flake registry";
}
CmdFlakePin()
{
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expectArg("alias", &alias);
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evalSettings.pureEval = false;
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}
void run(nix::ref<nix::Store> store) override
{
auto evalState = std::make_shared<EvalState>(searchPath, store);
Path userRegistryPath = getUserRegistryPath();
FlakeRegistry userRegistry = *readRegistry(userRegistryPath);
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auto it = userRegistry.entries.find(FlakeRef(alias));
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if (it != userRegistry.entries.end()) {
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it->second = getFlake(*evalState, it->second, true).ref;
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// The 'ref' in 'flake' is immutable.
writeRegistry(userRegistry, userRegistryPath);
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} else {
std::shared_ptr<FlakeRegistry> globalReg = getGlobalRegistry();
it = globalReg->entries.find(FlakeRef(alias));
if (it != globalReg->entries.end()) {
FlakeRef newRef = getFlake(*evalState, it->second, true).ref;
userRegistry.entries.insert_or_assign(alias, newRef);
writeRegistry(userRegistry, userRegistryPath);
} else
throw Error("the flake alias '%s' does not exist in the user or global registry", alias);
}
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}
};
struct CmdFlakeInit : virtual Args, Command
{
std::string name() override
{
return "init";
}
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"
);
}
};
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struct CmdFlake : virtual MultiCommand, virtual Command
{
CmdFlake()
: MultiCommand({make_ref<CmdFlakeList>()
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, make_ref<CmdFlakeUpdate>()
, make_ref<CmdFlakeInfo>()
, make_ref<CmdFlakeDeps>()
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, make_ref<CmdFlakeAdd>()
, make_ref<CmdFlakeRemove>()
, make_ref<CmdFlakePin>()
, make_ref<CmdFlakeInit>()
})
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{
}
std::string name() override
{
return "flake";
}
std::string description() override
{
return "manage Nix flakes";
}
void run() override
{
if (!command)
throw UsageError("'nix flake' requires a sub-command.");
command->run();
}
void printHelp(const string & programName, std::ostream & out) override
{
MultiCommand::printHelp(programName, out);
}
};
static RegisterCommand r1(make_ref<CmdFlake>());