lix/src/nix/flake.cc

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2018-11-29 18:18:36 +00:00
#include "command.hh"
#include "common-args.hh"
#include "shared.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.hh"
#include "registry.hh"
#include "json.hh"
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#include "sqlite.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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for (auto & registry : registries) {
for (auto & entry : registry->entries) {
// FIXME: format nicely
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logger->stdout("%s %s %s",
registry->type == Registry::Flag ? "flags " :
registry->type == Registry::User ? "user " :
registry->type == Registry::System ? "system" :
"global",
entry.from->to_string(),
entry.to->to_string());
}
}
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}
};
static void printFlakeInfo(const Store & store, const Flake & flake)
{
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logger->stdout("Resolved URL: %s", flake.resolvedRef.to_string());
logger->stdout("Locked URL: %s", flake.lockedRef.to_string());
if (flake.description)
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logger->stdout("Description: %s", *flake.description);
logger->stdout("Path: %s", store.printStorePath(flake.sourceInfo->storePath));
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if (auto rev = flake.lockedRef.input->getRev())
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logger->stdout("Revision: %s", rev->to_string(Base16, false));
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if (flake.sourceInfo->info.revCount)
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logger->stdout("Revisions: %s", *flake.sourceInfo->info.revCount);
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if (flake.sourceInfo->info.lastModified)
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logger->stdout("Last modified: %s",
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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;
j["originalUrl"] = flake.originalRef.to_string();
j["original"] = attrsToJson(flake.originalRef.toAttrs());
j["resolvedUrl"] = flake.resolvedRef.to_string();
j["resolved"] = attrsToJson(flake.resolvedRef.toAttrs());
j["url"] = flake.lockedRef.to_string(); // FIXME: rename to lockedUrl
j["locked"] = attrsToJson(flake.lockedRef.toAttrs());
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j["info"] = flake.sourceInfo->info.toJson();
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if (auto rev = flake.lockedRef.input->getRev())
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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);
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state.forceAttrs(*aOutputs->value);
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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
{
auto flake = getFlake();
if (json) {
auto json = flakeToJson(*store, flake);
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logger->stdout("%s", json.dump());
} else
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();
if (json)
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logger->stdout("%s", flake.lockFile.toJson());
else {
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logger->stdout("%s", flake.flake.lockedRef);
std::function<void(const Node & node, const std::string & prefix)> recurse;
recurse = [&](const Node & node, const std::string & prefix)
{
for (const auto & [i, input] : enumerate(node.inputs)) {
//auto tree2 = tree.child(i + 1 == inputs.inputs.size());
bool last = i + 1 == node.inputs.size();
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logger->stdout("%s" ANSI_BOLD "%s" ANSI_NORMAL ": %s",
prefix + (last ? treeLast : treeConn), input.first,
std::dynamic_pointer_cast<const LockedNode>(input.second)->lockedRef);
recurse(*input.second, prefix + (last ? treeNull : treeLine));
}
};
recurse(*flake.lockFile.root, "");
}
}
};
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));
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auto vToplevel = findAlongAttrPath(*state, "config.system.build.toplevel", bindings, v).first;
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);
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fetchers::Attrs extraAttrs;
if (toRef.subdir != "") extraAttrs["dir"] = toRef.subdir;
auto userRegistry = fetchers::getUserRegistry();
userRegistry->remove(fromRef.input);
userRegistry->add(fromRef.input, toRef.input, extraAttrs);
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);
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fetchers::Attrs extraAttrs;
if (ref.subdir != "") extraAttrs["dir"] = ref.subdir;
userRegistry->add(ref.input, resolved, extraAttrs);
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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));
// FIXME: use graph output, handle cycles.
std::function<void(const Node & node, std::optional<JSONObject> & jsonObj)> traverse;
traverse = [&](const Node & node, std::optional<JSONObject> & jsonObj)
{
auto jsonObj2 = jsonObj ? jsonObj->object("inputs") : std::optional<JSONObject>();
for (auto & input : node.inputs) {
auto lockedInput = std::dynamic_pointer_cast<const LockedNode>(input.second);
assert(lockedInput);
auto jsonObj3 = jsonObj2 ? jsonObj2->object(input.first) : std::optional<JSONObject>();
if (!dryRun)
lockedInput->lockedRef.input->fetchTree(store);
auto storePath = lockedInput->computeStorePath(*store);
if (jsonObj3)
jsonObj3->attr("path", store->printStorePath(storePath));
sources.insert(std::move(storePath));
traverse(*lockedInput, jsonObj3);
}
};
traverse(*flake.lockFile.root, jsonRoot);
if (!dryRun && !dstUri.empty()) {
ref<Store> dstStore = dstUri.empty() ? openStore() : openStore(dstUri);
copyPaths(store, dstStore, sources);
}
}
};
// FIXME: inefficient representation of attrs
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static const char * schema = R"sql(
create table if not exists Attributes (
parent integer not null,
name text,
type integer not null,
value text,
primary key (parent, name)
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);
)sql";
enum AttrType {
Placeholder = 0,
// FIXME: distinguish between full / partial attrsets
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Attrs = 1,
String = 2,
};
struct AttrDb
{
struct State
{
SQLite db;
SQLiteStmt insertAttribute;
SQLiteStmt queryAttribute;
SQLiteStmt queryAttributes;
std::unique_ptr<SQLiteTxn> txn;
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};
struct placeholder_t {};
typedef uint64_t AttrId;
typedef std::pair<AttrId, Symbol> AttrKey;
typedef std::variant<std::vector<Symbol>, std::string, placeholder_t> AttrValue;
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std::unique_ptr<Sync<State>> _state;
AttrDb(const Fingerprint & fingerprint)
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: _state(std::make_unique<Sync<State>>())
{
auto state(_state->lock());
Path cacheDir = getCacheDir() + "/nix/eval-cache-v2";
createDirs(cacheDir);
Path dbPath = cacheDir + "/" + fingerprint.to_string(Base16, false) + ".sqlite";
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state->db = SQLite(dbPath);
state->db.isCache();
state->db.exec(schema);
state->insertAttribute.create(state->db,
"insert or replace into Attributes(parent, name, type, value) values (?, ?, ?, ?)");
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state->queryAttribute.create(state->db,
"select rowid, type, value from Attributes where parent = ? and name = ?");
state->queryAttributes.create(state->db,
"select name from Attributes where parent = ?");
state->txn = std::make_unique<SQLiteTxn>(state->db);
}
~AttrDb()
{
try {
auto state(_state->lock());
state->txn->commit();
state->txn.reset();
} catch (...) {
ignoreException();
}
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}
AttrId setAttr(
AttrKey key,
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const std::vector<Symbol> & attrs)
{
auto state(_state->lock());
state->insertAttribute.use()
(key.first)
(key.second)
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(AttrType::Attrs)
(0, false).exec();
AttrId rowId = state->db.getLastInsertedRowId();
assert(rowId);
for (auto & attr : attrs)
state->insertAttribute.use()
(rowId)
(attr)
(AttrType::Placeholder)
(0, false).exec();
return rowId;
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}
AttrId setAttr(
AttrKey key,
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std::string_view s)
{
auto state(_state->lock());
state->insertAttribute.use()
(key.first)
(key.second)
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(AttrType::String)
(s).exec();
return state->db.getLastInsertedRowId();
}
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std::optional<std::pair<AttrId, AttrValue>> getAttr(
AttrKey key,
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SymbolTable & symbols)
{
auto state(_state->lock());
auto queryAttribute(state->queryAttribute.use()(key.first)(key.second));
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if (!queryAttribute.next()) return {};
auto rowId = (AttrType) queryAttribute.getInt(0);
auto type = (AttrType) queryAttribute.getInt(1);
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if (type == AttrType::Placeholder)
return {{rowId, placeholder_t()}};
else if (type == AttrType::Attrs) {
// FIXME: expensive, should separate this out.
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std::vector<Symbol> attrs;
auto queryAttributes(state->queryAttributes.use()(rowId));
while (queryAttributes.next())
attrs.push_back(symbols.create(queryAttributes.getStr(0)));
return {{rowId, attrs}};
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} else if (type == AttrType::String) {
return {{rowId, queryAttribute.getStr(2)}};
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} else
throw Error("unexpected type in evaluation cache");
}
};
struct AttrCursor;
struct AttrRoot : std::enable_shared_from_this<AttrRoot>
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{
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std::shared_ptr<AttrDb> db;
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EvalState & state;
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typedef std::function<Value *()> RootLoader;
RootLoader rootLoader;
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RootValue value;
AttrRoot(std::shared_ptr<AttrDb> db, EvalState & state, RootLoader rootLoader)
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: db(db)
, state(state)
, rootLoader(rootLoader)
{
}
Value * getRootValue()
{
if (!value) {
//printError("GET ROOT");
value = allocRootValue(rootLoader());
}
return *value;
}
std::shared_ptr<AttrCursor> getRoot()
{
return std::make_shared<AttrCursor>(ref(shared_from_this()), std::nullopt);
}
};
struct AttrCursor : std::enable_shared_from_this<AttrCursor>
{
ref<AttrRoot> root;
typedef std::optional<std::pair<std::shared_ptr<AttrCursor>, Symbol>> Parent;
Parent parent;
RootValue _value;
std::optional<std::pair<AttrDb::AttrId, AttrDb::AttrValue>> cachedValue;
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AttrCursor(
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ref<AttrRoot> root,
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Parent parent,
Value * value = nullptr,
std::optional<std::pair<AttrDb::AttrId, AttrDb::AttrValue>> && cachedValue = {})
: root(root), parent(parent), cachedValue(std::move(cachedValue))
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{
if (value)
_value = allocRootValue(value);
}
AttrDb::AttrKey getAttrKey()
{
if (!parent)
return {0, root->state.sEpsilon};
if (!parent->first->cachedValue) {
parent->first->cachedValue = root->db->getAttr(
parent->first->getAttrKey(), root->state.symbols);
assert(parent->first->cachedValue);
}
return {parent->first->cachedValue->first, parent->second};
}
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Value & getValue()
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{
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if (!_value) {
if (parent) {
auto & vParent = parent->first->getValue();
root->state.forceAttrs(vParent);
auto attr = vParent.attrs->get(parent->second);
if (!attr)
throw Error("attribute '%s' is unexpectedly missing", getAttrPathStr());
_value = allocRootValue(attr->value);
} else
_value = allocRootValue(root->getRootValue());
}
return **_value;
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}
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std::vector<Symbol> getAttrPath() const
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{
if (parent) {
auto attrPath = parent->first->getAttrPath();
attrPath.push_back(parent->second);
return attrPath;
} else
return {};
}
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std::vector<Symbol> getAttrPath(Symbol name) const
{
auto attrPath = getAttrPath();
attrPath.push_back(name);
return attrPath;
}
std::string getAttrPathStr() const
{
return concatStringsSep(".", getAttrPath());
}
std::string getAttrPathStr(Symbol name) const
{
return concatStringsSep(".", getAttrPath(name));
}
std::shared_ptr<AttrCursor> maybeGetAttr(Symbol name)
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{
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if (root->db) {
if (!cachedValue)
cachedValue = root->db->getAttr(getAttrKey(), root->state.symbols);
if (cachedValue) {
if (auto attrs = std::get_if<std::vector<Symbol>>(&cachedValue->second)) {
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for (auto & attr : *attrs)
if (attr == name)
return std::make_shared<AttrCursor>(root, std::make_pair(shared_from_this(), name));
return nullptr;
} else if (std::get_if<AttrDb::placeholder_t>(&cachedValue->second)) {
auto attr = root->db->getAttr({cachedValue->first, name}, root->state.symbols);
if (attr)
return std::make_shared<AttrCursor>(root, std::make_pair(shared_from_this(), name), nullptr, std::move(attr));
// Incomplete attrset, so need to fall thru and
// evaluate to see whether 'name' exists
} else
// FIXME: throw error?
return nullptr;
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}
}
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//printError("GET ATTR %s", getAttrPathStr(name));
root->state.forceValue(getValue());
if (getValue().type != tAttrs)
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return nullptr;
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auto attr = getValue().attrs->get(name);
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if (!attr)
return nullptr;
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return std::make_shared<AttrCursor>(root, std::make_pair(shared_from_this(), name), attr->value);
}
std::shared_ptr<AttrCursor> maybeGetAttr(std::string_view name)
{
return maybeGetAttr(root->state.symbols.create(name));
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}
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std::shared_ptr<AttrCursor> getAttr(Symbol name)
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{
auto p = maybeGetAttr(name);
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if (!p)
throw Error("attribute '%s' does not exist", getAttrPathStr(name));
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return p;
}
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std::shared_ptr<AttrCursor> getAttr(std::string_view name)
{
return getAttr(root->state.symbols.create(name));
}
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std::string getString()
{
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if (root->db) {
if (!cachedValue)
cachedValue = root->db->getAttr(getAttrKey(), root->state.symbols);
if (cachedValue && !std::get_if<AttrDb::placeholder_t>(&cachedValue->second)) {
if (auto s = std::get_if<std::string>(&cachedValue->second)) {
//printError("GOT STRING %s", getAttrPathStr());
return *s;
} else
throw Error("unexpected type mismatch in evaluation cache (string expected)");
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}
}
//printError("GET STRING %s", getAttrPathStr());
auto s = root->state.forceString(getValue());
if (root->db)
cachedValue = {root->db->setAttr(getAttrKey(), s), s};
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return s;
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}
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std::vector<Symbol> getAttrs()
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{
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if (root->db) {
if (!cachedValue)
cachedValue = root->db->getAttr(getAttrKey(), root->state.symbols);
if (cachedValue && !std::get_if<AttrDb::placeholder_t>(&cachedValue->second)) {
if (auto attrs = std::get_if<std::vector<Symbol>>(&cachedValue->second)) {
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//printError("GOT ATTRS %s", getAttrPathStr());
return *attrs;
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} else
throw Error("unexpected type mismatch in evaluation cache (attrs expected)");
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}
}
//printError("GET ATTRS %s", getAttrPathStr());
std::vector<Symbol> attrs;
root->state.forceAttrs(getValue());
for (auto & attr : *getValue().attrs)
attrs.push_back(attr.name);
std::sort(attrs.begin(), attrs.end(), [](const Symbol & a, const Symbol & b) {
return (const string &) a < (const string &) b;
});
if (root->db)
cachedValue = {root->db->setAttr(getAttrKey(), attrs), attrs};
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return attrs;
}
bool isDerivation()
{
auto aType = maybeGetAttr("type");
return aType && aType->getString() == "derivation";
}
};
struct CmdFlakeShow : FlakeCommand
{
bool showLegacy = false;
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bool useEvalCache = true;
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CmdFlakeShow()
{
mkFlag()
.longName("legacy")
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.description("show the contents of the 'legacyPackages' output")
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.set(&showLegacy, true);
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mkFlag()
.longName("no-eval-cache")
.description("do not use the flake evaluation cache")
.handler([&]() { useEvalCache = false; });
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}
std::string description() override
{
return "show the outputs provided by a flake";
}
void run(nix::ref<nix::Store> store) override
{
auto state = getEvalState();
auto flake = lockFlake();
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std::function<void(AttrCursor & visitor, const std::vector<Symbol> & attrPath, const std::string & headerPrefix, const std::string & nextPrefix)> visit;
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visit = [&](AttrCursor & visitor, const std::vector<Symbol> & attrPath, const std::string & headerPrefix, const std::string & nextPrefix)
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{
Activity act(*logger, lvlInfo, actUnknown,
fmt("evaluating '%s'", concatStringsSep(".", attrPath)));
try {
auto recurse = [&]()
{
logger->stdout("%s", headerPrefix);
auto attrs = visitor.getAttrs();
for (const auto & [i, attr] : enumerate(attrs)) {
bool last = i + 1 == attrs.size();
auto visitor2 = visitor.getAttr(attr);
auto attrPath2(attrPath);
attrPath2.push_back(attr);
visit(*visitor2, attrPath2,
fmt(ANSI_GREEN "%s%s" ANSI_NORMAL ANSI_BOLD "%s" ANSI_NORMAL, nextPrefix, last ? treeLast : treeConn, attr),
nextPrefix + (last ? treeNull : treeLine));
}
};
auto showDerivation = [&]()
{
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auto name = visitor.getAttr(state->sName)->getString();
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/*
std::string description;
if (auto aMeta = visitor.maybeGetAttr("meta")) {
if (auto aDescription = aMeta->maybeGetAttr("description"))
description = aDescription->getString();
}
*/
logger->stdout("%s: %s '%s'",
headerPrefix,
attrPath.size() == 2 && attrPath[0] == "devShell" ? "development environment" :
attrPath.size() == 3 && attrPath[0] == "checks" ? "derivation" :
attrPath.size() >= 1 && attrPath[0] == "hydraJobs" ? "derivation" :
"package",
name);
};
if (attrPath.size() == 0
|| (attrPath.size() == 1 && (
attrPath[0] == "defaultPackage"
|| attrPath[0] == "devShell"
|| attrPath[0] == "nixosConfigurations"
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|| attrPath[0] == "nixosModules"
|| attrPath[0] == "defaultApp"))
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|| ((attrPath.size() == 1 || attrPath.size() == 2)
&& (attrPath[0] == "checks"
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|| attrPath[0] == "packages"
|| attrPath[0] == "apps"))
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)
{
recurse();
}
else if (
(attrPath.size() == 2 && (attrPath[0] == "defaultPackage" || attrPath[0] == "devShell"))
|| (attrPath.size() == 3 && (attrPath[0] == "checks" || attrPath[0] == "packages"))
)
{
if (visitor.isDerivation())
showDerivation();
else
throw Error("expected a derivation");
}
else if (attrPath.size() > 0 && attrPath[0] == "hydraJobs") {
if (visitor.isDerivation())
showDerivation();
else
recurse();
}
else if (attrPath.size() > 0 && attrPath[0] == "legacyPackages") {
if (attrPath.size() == 1)
recurse();
else if (!showLegacy)
logger->stdout("%s: " ANSI_YELLOW "omitted" ANSI_NORMAL " (use '--legacy' to show)", headerPrefix);
else {
if (visitor.isDerivation())
showDerivation();
else if (attrPath.size() <= 2)
// FIXME: handle recurseIntoAttrs
recurse();
}
}
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else if (
(attrPath.size() == 2 && attrPath[0] == "defaultApp") ||
(attrPath.size() == 3 && attrPath[0] == "apps"))
{
auto aType = visitor.maybeGetAttr("type");
if (!aType || aType->getString() != "app")
throw EvalError("not an app definition");
logger->stdout("%s: app", headerPrefix);
}
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else {
logger->stdout("%s: %s",
headerPrefix,
attrPath.size() == 1 && attrPath[0] == "overlay" ? "Nixpkgs overlay" :
attrPath.size() == 2 && attrPath[0] == "nixosConfigurations" ? "NixOS configuration" :
attrPath.size() == 2 && attrPath[0] == "nixosModules" ? "NixOS module" :
ANSI_YELLOW "unknown" ANSI_NORMAL);
}
} catch (EvalError & e) {
if (!(attrPath.size() > 0 && attrPath[0] == "legacyPackages"))
logger->stdout("%s: " ANSI_RED "%s" ANSI_NORMAL, headerPrefix, e.what());
}
};
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auto db = useEvalCache ? std::make_shared<AttrDb>(flake.getFingerprint()) : nullptr;
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auto root = std::make_shared<AttrRoot>(db, *state,
[&]()
{
auto vFlake = state->allocValue();
flake::callFlake(*state, flake, *vFlake);
state->forceAttrs(*vFlake);
auto aOutputs = vFlake->attrs->get(state->symbols.create("outputs"));
assert(aOutputs);
return aOutputs->value;
});
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visit(*root->getRoot(), {}, fmt(ANSI_BOLD "%s" ANSI_NORMAL, flake.flake.lockedRef), "");
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}
};
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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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{"show", []() { return make_ref<CmdFlakeShow>(); }},
})
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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");