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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;
Path manifestFile = userEnv + "/manifest.nix";
if (pathExists(manifestFile)) {
Value v;
state.evalFile(manifestFile, v);
Bindings bindings;
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. */
PathSet drvsToBuild;
foreach (DrvInfos::iterator, i, elems)
if (i->queryDrvPath() != "")
drvsToBuild.insert(i->queryDrvPath());
debug(format("building user environment dependencies"));
store->buildPaths(drvsToBuild, state.repair ? bmRepair : bmNormal);
/* Construct the whole top level derivation. */
PathSet references;
Value manifest;
state.mkList(manifest, elems.size());
unsigned int n = 0;
foreach (DrvInfos::iterator, 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.elems[n++] = &v;
state.mkAttrs(v, 16);
mkString(*state.allocAttr(v, state.sType), "derivation");
mkString(*state.allocAttr(v, state.sName), i->name);
if (!i->system.empty())
mkString(*state.allocAttr(v, state.sSystem), i->system);
mkString(*state.allocAttr(v, state.sOutPath), i->queryOutPath());
if (drvPath != "")
mkString(*state.allocAttr(v, state.sDrvPath), i->queryDrvPath());
// Copy each output.
DrvInfo::Outputs outputs = i->queryOutputs();
Value & vOutputs = *state.allocAttr(v, state.sOutputs);
state.mkList(vOutputs, outputs.size());
unsigned int m = 0;
foreach (DrvInfo::Outputs::iterator, j, outputs) {
mkString(*(vOutputs.list.elems[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'. */
store->addTempRoot(j->second);
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();
foreach (StringSet::iterator, 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(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 = 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, topLevel;
state.mkAttrs(args, 3);
mkString(*state.allocAttr(args, state.symbols.create("manifest")),
manifestFile, singleton<PathSet>(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));
Path topLevelDrv = 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");
store->buildPaths(singleton<PathSet>(topLevelDrv), state.repair ? bmRepair : bmNormal);
/* Switch the current user environment to the output path. */
PathLocks lock;
lockProfile(lock, profile);
Path lockTokenCur = optimisticLockProfile(profile);
if (lockToken != lockTokenCur) {
printMsg(lvlError, format("profile ‘%1%’ changed while we were busy; restarting") % profile);
return false;
}
debug(format("switching to new user environment"));
Path generation = createGeneration(profile, topLevelOut);
switchLink(profile, generation);
return true;
}
}
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