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#include "nix-env/user-env.hh"
#include <iostream>
#include <glog/logging.h>
#include "libexpr/eval-inline.hh"
#include "libexpr/eval.hh"
#include "libmain/shared.hh"
#include "libstore/derivations.hh"
#include "libstore/globals.hh"
#include "libstore/profiles.hh"
#include "libstore/store-api.hh"
#include "libutil/status.hh"
#include "libutil/util.hh"
namespace nix {
DrvInfos queryInstalled(EvalState& state, const Path& userEnv) {
DrvInfos elems;
Path manifestFile = userEnv + "/manifest.nix";
if (pathExists(manifestFile)) {
Value v;
state.evalFile(manifestFile, v);
std::unique_ptr<Bindings> bindings(Bindings::New());
getDerivations(state, v, "", bindings.get(), elems, false);
}
return elems;
}
bool createUserEnv(EvalState& state, DrvInfos& elems, const Path& profile,
bool keepDerivations, const std::string& lockToken) {
/* Build the components in the user environment, if they don't
exist already. */
PathSet drvsToBuild;
for (auto& i : elems) {
if (!i.queryDrvPath().empty()) {
drvsToBuild.insert(i.queryDrvPath());
}
}
DLOG(INFO) << "building user environment dependencies";
util::OkOrThrow(state.store->buildPaths(
std::cerr, drvsToBuild, state.repair != 0u ? bmRepair : bmNormal));
/* Construct the whole top level derivation. */
PathSet references;
Value manifest;
state.mkList(manifest, elems.size());
unsigned int n = 0;
for (auto& i : elems) {
/* Create a pseudo-derivation containing the name, system,
output paths, and optionally the derivation path, as well
as the meta attributes. */
Path drvPath = keepDerivations ? i.queryDrvPath() : "";
Value* v = state.allocValue();
(*manifest.list)[n++] = v;
state.mkAttrs(*v, 16);
mkString(*state.allocAttr(*v, state.sType), "derivation");
mkString(*state.allocAttr(*v, state.sName), i.queryName());
auto system = i.querySystem();
if (!system.empty()) {
mkString(*state.allocAttr(*v, state.sSystem), system);
}
mkString(*state.allocAttr(*v, state.sOutPath), i.queryOutPath());
if (!drvPath.empty()) {
mkString(*state.allocAttr(*v, state.sDrvPath), i.queryDrvPath());
}
// Copy each output meant for installation.
DrvInfo::Outputs outputs = i.queryOutputs(true);
Value& vOutputs = *state.allocAttr(*v, state.sOutputs);
state.mkList(vOutputs, outputs.size());
unsigned int m = 0;
for (auto& j : outputs) {
mkString(*((*vOutputs.list)[m++] = state.allocValue()), j.first);
Value& vOutputs = *state.allocAttr(*v, state.symbols.Create(j.first));
state.mkAttrs(vOutputs, 2);
mkString(*state.allocAttr(vOutputs, state.sOutPath), j.second);
/* This is only necessary when installing store paths, e.g.,
`nix-env -i /nix/store/abcd...-foo'. */
state.store->addTempRoot(j.second);
state.store->ensurePath(j.second);
references.insert(j.second);
}
// Copy the meta attributes.
Value& vMeta = *state.allocAttr(*v, state.sMeta);
state.mkAttrs(vMeta, 16);
StringSet metaNames = i.queryMetaNames();
for (auto& j : metaNames) {
Value* v = i.queryMeta(j);
if (v == nullptr) {
continue;
}
vMeta.attrs->push_back(Attr(state.symbols.Create(j), v));
}
if (!drvPath.empty()) {
references.insert(drvPath);
}
}
/* Also write a copy of the list of user environment elements to
the store; we need it for future modifications of the
environment. */
Path manifestFile = state.store->addTextToStore(
"env-manifest.nix", (format("%1%") % manifest).str(), references);
/* Get the environment builder expression. */
Value envBuilder;
state.evalFile(state.findFile("nix/buildenv.nix"), envBuilder);
/* Construct a Nix expression that calls the user environment
builder with the manifest as argument. */
Value args;
Value topLevel;
state.mkAttrs(args, 3);
mkString(*state.allocAttr(args, state.symbols.Create("manifest")),
manifestFile, {manifestFile});
args.attrs->push_back(Attr(state.symbols.Create("derivations"), &manifest));
mkApp(topLevel, envBuilder, args);
/* Evaluate it. */
DLOG(INFO) << "evaluating user environment builder";
state.forceValue(topLevel);
PathSet context;
Attr& aDrvPath(topLevel.attrs->find(state.sDrvPath)->second);
Path topLevelDrv =
state.coerceToPath(aDrvPath.pos != nullptr ? *(aDrvPath.pos) : noPos,
*(aDrvPath.value), context);
Attr& aOutPath(topLevel.attrs->find(state.sOutPath)->second);
Path topLevelOut =
state.coerceToPath(aOutPath.pos != nullptr ? *(aOutPath.pos) : noPos,
*(aOutPath.value), context);
/* Realise the resulting store expression. */
DLOG(INFO) << "building user environment";
util::OkOrThrow(state.store->buildPaths(
std::cerr, {topLevelDrv}, state.repair != 0u ? bmRepair : bmNormal));
/* Switch the current user environment to the output path. */
auto store2 = state.store.dynamic_pointer_cast<LocalFSStore>();
if (store2) {
PathLocks lock;
lockProfile(lock, profile);
Path lockTokenCur = optimisticLockProfile(profile);
if (lockToken != lockTokenCur) {
LOG(WARNING) << "profile '" << profile
<< "' changed while we were busy; restarting";
return false;
}
DLOG(INFO) << "switching to new user environment";
Path generation =
createGeneration(ref<LocalFSStore>(store2), profile, topLevelOut);
switchLink(profile, generation);
}
return true;
}
} // namespace nix
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