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#include "user-env.hh"
#include "util.hh"
#include "derivations.hh"
#include "store-api.hh"
#include "globals.hh"
#include "shared.hh"
#include "eval.hh"
#include "eval-inline.hh"
#include "profiles.hh"
namespace nix {
DrvInfos queryInstalled(EvalState & state, const Path & userEnv)
{
DrvInfos elems;
if (pathExists(userEnv + "/manifest.json"))
throw Error("profile '%s' is incompatible with 'nix-env'; please use 'nix profile' instead", userEnv);
Path manifestFile = userEnv + "/manifest.nix";
if (pathExists(manifestFile)) {
Value v;
state.evalFile(manifestFile, v);
Bindings & bindings(*state.allocBindings(0));
getDerivations(state, v, "", bindings, elems, false);
}
return elems;
}
bool createUserEnv(EvalState & state, DrvInfos & elems,
const Path & profile, bool keepDerivations,
const string & lockToken)
{
/* Build the components in the user environment, if they don't
exist already. */
std::vector<StorePathWithOutputs> drvsToBuild;
for (auto & i : elems)
if (i.queryDrvPath() != "")
drvsToBuild.push_back({state.store->parseStorePath(i.queryDrvPath())});
debug(format("building user environment dependencies"));
state.store->buildPaths(drvsToBuild, state.repair ? bmRepair : bmNormal);
/* Construct the whole top level derivation. */
StorePathSet 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.listElems()[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 != "")
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.listElems()[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(state.store->parseStorePath(j.second));
state.store->ensurePath(state.store->parseStorePath(j.second));
references.insert(state.store->parseStorePath(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) continue;
vMeta.attrs->push_back(Attr(state.symbols.create(j), v));
}
vMeta.attrs->sort();
v.attrs->sort();
if (drvPath != "") references.insert(state.store->parseStorePath(drvPath));
}
/* Also write a copy of the list of user environment elements to
the store; we need it for future modifications of the
environment. */
auto manifestFile = state.store->addTextToStore("env-manifest.nix",
fmt("%s", manifest), references);
/* Get the environment builder expression. */
Value envBuilder;
state.eval(state.parseExprFromString(
#include "buildenv.nix.gen.hh"
, "/"), envBuilder);
/* Construct a Nix expression that calls the user environment
builder with the manifest as argument. */
Value args, topLevel;
state.mkAttrs(args, 3);
mkString(*state.allocAttr(args, state.symbols.create("manifest")),
state.store->printStorePath(manifestFile), {state.store->printStorePath(manifestFile)});
args.attrs->push_back(Attr(state.symbols.create("derivations"), &manifest));
args.attrs->sort();
mkApp(topLevel, envBuilder, args);
/* Evaluate it. */
debug("evaluating user environment builder");
state.forceValue(topLevel);
PathSet context;
Attr & aDrvPath(*topLevel.attrs->find(state.sDrvPath));
auto topLevelDrv = state.store->parseStorePath(state.coerceToPath(aDrvPath.pos ? *(aDrvPath.pos) : noPos, *(aDrvPath.value), context));
Attr & aOutPath(*topLevel.attrs->find(state.sOutPath));
Path topLevelOut = state.coerceToPath(aOutPath.pos ? *(aOutPath.pos) : noPos, *(aOutPath.value), context);
/* Realise the resulting store expression. */
debug("building user environment");
std::vector<StorePathWithOutputs> topLevelDrvs;
topLevelDrvs.push_back({topLevelDrv});
state.store->buildPaths(topLevelDrvs, state.repair ? 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) {
printInfo("profile '%1%' changed while we were busy; restarting", profile);
return false;
}
debug(format("switching to new user environment"));
Path generation = createGeneration(ref<LocalFSStore>(store2), profile,
store2->parseStorePath(topLevelOut));
switchLink(profile, generation);
}
return true;
}
}
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