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"
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#include "primops/flake.hh"
#include <nlohmann/json.hpp>
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#include <queue>
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using namespace nix;
class FlakeCommand : virtual Args, public EvalCommand, public MixFlakeOptions
{
std::string flakeUri = ".";
public:
FlakeCommand()
{
expectArg("flake-uri", &flakeUri, true);
}
FlakeRef getFlakeRef()
{
if (flakeUri.find('/') != std::string::npos || flakeUri == ".")
return FlakeRef(flakeUri, true);
else
return FlakeRef(flakeUri);
}
Flake getFlake()
{
auto evalState = getEvalState();
return nix::getFlake(*evalState, getFlakeRef(), useRegistries);
}
ResolvedFlake resolveFlake()
{
return nix::resolveFlake(*getEvalState(), getFlakeRef(), getLockFileMode());
}
};
struct CmdFlakeList : EvalCommand
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{
std::string name() override
{
return "list";
}
std::string description() override
{
return "list available Nix flakes";
}
void run(nix::ref<nix::Store> store) override
{
auto registries = getEvalState()->getFlakeRegistries();
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stopProgressBar();
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for (auto & entry : registries[FLAG_REGISTRY]->entries)
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std::cout << entry.first.to_string() << " flags " << entry.second.to_string() << "\n";
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for (auto & entry : registries[USER_REGISTRY]->entries)
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std::cout << entry.first.to_string() << " user " << entry.second.to_string() << "\n";
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for (auto & entry : registries[GLOBAL_REGISTRY]->entries)
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std::cout << entry.first.to_string() << " global " << entry.second.to_string() << "\n";
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}
};
static void printSourceInfo(const SourceInfo & sourceInfo)
{
std::cout << "URI: " << sourceInfo.resolvedRef.to_string() << "\n";
if (sourceInfo.resolvedRef.ref)
std::cout << "Branch: " << *sourceInfo.resolvedRef.ref;
if (sourceInfo.resolvedRef.rev)
std::cout << "Revision: " << sourceInfo.resolvedRef.rev->to_string(Base16, false) << "\n";
if (sourceInfo.revCount)
std::cout << "Revcount: " << *sourceInfo.revCount << "\n";
std::cout << "Path: " << sourceInfo.storePath << "\n";
}
static void sourceInfoToJson(const SourceInfo & sourceInfo, nlohmann::json & j)
{
j["uri"] = sourceInfo.resolvedRef.to_string();
if (sourceInfo.resolvedRef.ref)
j["branch"] = *sourceInfo.resolvedRef.ref;
if (sourceInfo.resolvedRef.rev)
j["revision"] = sourceInfo.resolvedRef.rev->to_string(Base16, false);
if (sourceInfo.revCount)
j["revCount"] = *sourceInfo.revCount;
j["path"] = sourceInfo.storePath;
}
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static void printFlakeInfo(const Flake & flake)
{
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std::cout << "ID: " << flake.id << "\n";
std::cout << "Description: " << flake.description << "\n";
std::cout << "Epoch: " << flake.epoch << "\n";
printSourceInfo(flake.sourceInfo);
}
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static nlohmann::json flakeToJson(const Flake & flake)
{
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nlohmann::json j;
j["id"] = flake.id;
j["description"] = flake.description;
j["epoch"] = flake.epoch;
sourceInfoToJson(flake.sourceInfo, j);
return j;
}
static void printNonFlakeInfo(const NonFlake & nonFlake)
{
std::cout << "ID: " << nonFlake.alias << "\n";
printSourceInfo(nonFlake.sourceInfo);
}
static nlohmann::json nonFlakeToJson(const NonFlake & nonFlake)
{
nlohmann::json j;
j["id"] = nonFlake.alias;
sourceInfoToJson(nonFlake.sourceInfo, j);
return j;
}
// FIXME: merge info CmdFlakeInfo?
struct CmdFlakeDeps : FlakeCommand
{
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 = getEvalState();
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evalState->addRegistryOverrides(registryOverrides);
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std::queue<ResolvedFlake> todo;
todo.push(resolveFlake());
stopProgressBar();
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while (!todo.empty()) {
auto resFlake = std::move(todo.front());
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todo.pop();
for (auto & nonFlake : resFlake.nonFlakeDeps)
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printNonFlakeInfo(nonFlake);
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for (auto & info : resFlake.flakeDeps) {
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printFlakeInfo(info.second.flake);
todo.push(info.second);
}
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}
}
};
struct CmdFlakeUpdate : FlakeCommand
{
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 = getEvalState();
auto flakeRef = getFlakeRef();
if (std::get_if<FlakeRef::IsPath>(&flakeRef.data))
updateLockFile(*evalState, flakeRef, true);
else
throw Error("cannot update lockfile of flake '%s'", flakeRef);
}
};
struct CmdFlakeInfo : FlakeCommand, MixJSON
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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 () { }
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void run(nix::ref<nix::Store> store) override
{
auto flake = getFlake();
stopProgressBar();
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if (json)
std::cout << flakeToJson(flake).dump() << std::endl;
else
printFlakeInfo(flake);
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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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}
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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}
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, EvalCommand
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{
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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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}
void run(nix::ref<nix::Store> store) override
{
auto evalState = getEvalState();
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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()) {
it->second = getFlake(*evalState, it->second, true).sourceInfo.resolvedRef;
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writeRegistry(userRegistry, userRegistryPath);
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} else {
std::shared_ptr<FlakeRegistry> globalReg = evalState->getGlobalFlakeRegistry();
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it = globalReg->entries.find(FlakeRef(alias));
if (it != globalReg->entries.end()) {
auto newRef = getFlake(*evalState, it->second, true).sourceInfo.resolvedRef;
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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"
);
}
};
struct CmdFlakeClone : FlakeCommand
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{
Path destDir;
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std::string name() override
{
return "clone";
}
std::string description() override
{
return "clone flake repository";
}
CmdFlakeClone()
{
expectArg("dest-dir", &destDir, true);
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}
void run(nix::ref<nix::Store> store) override
{
auto evalState = getEvalState();
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Registries registries = evalState->getFlakeRegistries();
gitCloneFlake(getFlakeRef().to_string(), *evalState, registries, destDir);
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}
};
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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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, make_ref<CmdFlakeClone>()
})
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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>());