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Eliminate the "store" global variable

Browse source 
Also, move a few free-standing functions into StoreAPI and Derivation.

Also, introduce a non-nullable smart pointer, ref<T>, which is just a
wrapper around std::shared_ptr ensuring that the pointer is never
null. (For reference-counted values, this is better than passing a
"T&", because the latter doesn't maintain the refcount. Usually, the
caller will have a shared_ptr keeping the value alive, but that's not
always the case, e.g., when passing a reference to a std::thread via
std::bind.)
This commit is contained in:
Eelco Dolstra 2016-02-04 14:28:26 +01:00
parent 4f7824c58e
commit c10c61449f
36 changed files with 511 additions and 458 deletions
Download patch file Download diff file Expand all files Collapse all files

2
src/libexpr/common-opts.cc
View file

@ -55,7 +55,7 @@ bool parseSearchPathArg(Strings::iterator & i,
Path lookupFileArg(EvalState & state, string s)
{
if (isUri(s))
return downloadFileCached(s, true);
return downloadFileCached(state.store, s, true);
else if (s.size() > 2 && s.at(0) == '<' && s.at(s.size() - 1) == '>') {
Path p = s.substr(1, s.size() - 2);
return state.findFile(p);

2
src/libexpr/common-opts.hh
View file

@ -4,6 +4,8 @@
namespace nix {
class StoreAPI;
/* Some common option parsing between nix-env and nix-instantiate. */
bool parseAutoArgs(Strings::iterator & i,
const Strings::iterator & argsEnd, std::map<string, string> & res);

3
src/libexpr/eval.cc
View file

@ -244,7 +244,7 @@ static Strings parseNixPath(const string & in)
}
EvalState::EvalState(const Strings & _searchPath)
EvalState::EvalState(const Strings & _searchPath, ref<StoreAPI> store)
: sWith(symbols.create("<with>"))
, sOutPath(symbols.create("outPath"))
, sDrvPath(symbols.create("drvPath"))
@ -262,6 +262,7 @@ EvalState::EvalState(const Strings & _searchPath)
, sColumn(symbols.create("column"))
, sFunctor(symbols.create("__functor"))
, sToString(symbols.create("__toString"))
, store(store)
, baseEnv(allocEnv(128))
, staticBaseEnv(false, 0)
{

10
src/libexpr/eval.hh
View file

@ -16,6 +16,7 @@
namespace nix {
class StoreAPI;
class EvalState;
@ -82,6 +83,8 @@ public:
Value vEmptySet;
const ref<StoreAPI> store;
private:
SrcToStore srcToStore;
@ -97,7 +100,7 @@ private:
public:
EvalState(const Strings & _searchPath);
EvalState(const Strings & _searchPath, ref<StoreAPI> store);
~EvalState();
void addToSearchPath(const string & s, bool warn = false);
@ -240,6 +243,8 @@ public:
/* Print statistics. */
void printStats();
void realiseContext(const PathSet & context);
private:
unsigned long nrEnvs = 0;
@ -290,7 +295,4 @@ struct InvalidPathError : EvalError
#endif
};
/* Realise all paths in `context' */
void realiseContext(const PathSet & context);
}

2
src/libexpr/parser.y
View file

@ -603,7 +603,7 @@ void EvalState::addToSearchPath(const string & s, bool warn)
}
if (isUri(path))
path = downloadFileCached(path, true);
path = downloadFileCached(store, path, true);
path = absPath(path);
if (pathExists(path)) {

61
src/libexpr/primops.cc
View file

@ -1,15 +1,15 @@
#include "eval.hh"
#include "misc.hh"
#include "globals.hh"
#include "store-api.hh"
#include "util.hh"
#include "archive.hh"
#include "value-to-xml.hh"
#include "value-to-json.hh"
#include "derivations.hh"
#include "download.hh"
#include "eval-inline.hh"
#include "eval.hh"
#include "globals.hh"
#include "json-to-value.hh"
#include "names.hh"
#include "eval-inline.hh"
#include "download.hh"
#include "store-api.hh"
#include "util.hh"
#include "value-to-json.hh"
#include "value-to-xml.hh"
#include <sys/types.h>
#include <sys/stat.h>
@ -43,7 +43,7 @@ std::pair<string, string> decodeContext(const string & s)
InvalidPathError::InvalidPathError(const Path & path) :
EvalError(format("path ‘%1%’ is not valid") % path), path(path) {}
void realiseContext(const PathSet & context)
void EvalState::realiseContext(const PathSet & context)
{
PathSet drvs;
for (auto & i : context) {
@ -52,16 +52,14 @@ void realiseContext(const PathSet & context)
assert(isStorePath(ctx));
if (!store->isValidPath(ctx))
throw InvalidPathError(ctx);
if (!decoded.second.empty() && isDerivation(ctx))
if (!decoded.second.empty() && nix::isDerivation(ctx))
drvs.insert(decoded.first + "!" + decoded.second);
}
if (!drvs.empty()) {
/* For performance, prefetch all substitute info. */
PathSet willBuild, willSubstitute, unknown;
unsigned long long downloadSize, narSize;
queryMissing(*store, drvs,
willBuild, willSubstitute, unknown, downloadSize, narSize);
store->queryMissing(drvs, willBuild, willSubstitute, unknown, downloadSize, narSize);
store->buildPaths(drvs);
}
}
@ -75,7 +73,7 @@ static void prim_scopedImport(EvalState & state, const Pos & pos, Value * * args
Path path = state.coerceToPath(pos, *args[1], context);
try {
realiseContext(context);
state.realiseContext(context);
} catch (InvalidPathError & e) {
throw EvalError(format("cannot import ‘%1%’, since path ‘%2%’ is not valid, at %3%")
% path % e.path % pos);
@ -83,7 +81,7 @@ static void prim_scopedImport(EvalState & state, const Pos & pos, Value * * args
path = state.checkSourcePath(path);
if (isStorePath(path) && store->isValidPath(path) && isDerivation(path)) {
if (isStorePath(path) && state.store->isValidPath(path) && isDerivation(path)) {
Derivation drv = readDerivation(path);
Value & w = *state.allocValue();
state.mkAttrs(w, 3 + drv.outputs.size());
@ -145,7 +143,7 @@ static void prim_importNative(EvalState & state, const Pos & pos, Value * * args
Path path = state.coerceToPath(pos, *args[0], context);
try {
realiseContext(context);
state.realiseContext(context);
} catch (InvalidPathError & e) {
throw EvalError(format("cannot import ‘%1%’, since path ‘%2%’ is not valid, at %3%")
% path % e.path % pos);
@ -560,11 +558,12 @@ static void prim_derivationStrict(EvalState & state, const Pos & pos, Value * *
runs. */
if (path.at(0) == '=') {
/* !!! This doesn't work if readOnlyMode is set. */
PathSet refs; computeFSClosure(*store, string(path, 1), refs);
PathSet refs;
state.store->computeFSClosure(string(path, 1), refs);
for (auto & j : refs) {
drv.inputSrcs.insert(j);
if (isDerivation(j))
drv.inputDrvs[j] = store->queryDerivationOutputNames(j);
drv.inputDrvs[j] = state.store->queryDerivationOutputNames(j);
}
}
@ -581,7 +580,7 @@ static void prim_derivationStrict(EvalState & state, const Pos & pos, Value * *
/* Handle derivation contexts returned by
‘builtins.storePath’. */
else if (isDerivation(path))
drv.inputDrvs[path] = store->queryDerivationOutputNames(path);
drv.inputDrvs[path] = state.store->queryDerivationOutputNames(path);
/* Otherwise it's a source file. */
else
@ -630,7 +629,7 @@ static void prim_derivationStrict(EvalState & state, const Pos & pos, Value * *
/* Use the masked derivation expression to compute the output
path. */
Hash h = hashDerivationModulo(*store, drv);
Hash h = hashDerivationModulo(*state.store, drv);
for (auto & i : drv.outputs)
if (i.second.path == "") {
@ -641,7 +640,7 @@ static void prim_derivationStrict(EvalState & state, const Pos & pos, Value * *
}
/* Write the resulting term into the Nix store directory. */
Path drvPath = writeDerivation(*store, drv, drvName, state.repair);
Path drvPath = writeDerivation(state.store, drv, drvName, state.repair);
printMsg(lvlChatty, format("instantiated ‘%1%’ -> ‘%2%’")
% drvName % drvPath);
@ -649,7 +648,7 @@ static void prim_derivationStrict(EvalState & state, const Pos & pos, Value * *
/* Optimisation, but required in read-only mode! because in that
case we don't actually write store derivations, so we can't
read them later. */
drvHashes[drvPath] = hashDerivationModulo(*store, drv);
drvHashes[drvPath] = hashDerivationModulo(*state.store, drv);
state.mkAttrs(v, 1 + drv.outputs.size());
mkString(*state.allocAttr(v, state.sDrvPath), drvPath, singleton<PathSet>("=" + drvPath));
@ -695,7 +694,7 @@ static void prim_storePath(EvalState & state, const Pos & pos, Value * * args, V
throw EvalError(format("path ‘%1%’ is not in the Nix store, at %2%") % path % pos);
Path path2 = toStorePath(path);
if (!settings.readOnlyMode)
store->ensurePath(path2);
state.store->ensurePath(path2);
context.insert(path2);
mkString(v, path, context);
}
@ -745,7 +744,7 @@ static void prim_readFile(EvalState & state, const Pos & pos, Value * * args, Va
PathSet context;
Path path = state.coerceToPath(pos, *args[0], context);
try {
realiseContext(context);
state.realiseContext(context);
} catch (InvalidPathError & e) {
throw EvalError(format("cannot read ‘%1%’, since path ‘%2%’ is not valid, at %3%")
% path % e.path % pos);
@ -786,7 +785,7 @@ static void prim_findFile(EvalState & state, const Pos & pos, Value * * args, Va
string path = state.forceStringNoCtx(*args[1], pos);
try {
realiseContext(context);
state.realiseContext(context);
} catch (InvalidPathError & e) {
throw EvalError(format("cannot find ‘%1%’, since path ‘%2%’ is not valid, at %3%")
% path % e.path % pos);
@ -801,7 +800,7 @@ static void prim_readDir(EvalState & state, const Pos & pos, Value * * args, Val
PathSet ctx;
Path path = state.coerceToPath(pos, *args[0], ctx);
try {
realiseContext(ctx);
state.realiseContext(ctx);
} catch (InvalidPathError & e) {
throw EvalError(format("cannot read ‘%1%’, since path ‘%2%’ is not valid, at %3%")
% path % e.path % pos);
@ -879,13 +878,13 @@ static void prim_toFile(EvalState & state, const Pos & pos, Value * * args, Valu
if (path.at(0) != '~')
throw EvalError(format("in ‘toFile’: the file ‘%1%’ cannot refer to derivation outputs, at %2%") % name % pos);
path = string(path, 1);
}
}
refs.insert(path);
}
Path storePath = settings.readOnlyMode
? computeStorePathForText(name, contents, refs)
: store->addTextToStore(name, contents, refs, state.repair);
: state.store->addTextToStore(name, contents, refs, state.repair);
/* Note: we don't need to add `context' to the context of the
result, since `storePath' itself has references to the paths
@ -951,7 +950,7 @@ static void prim_filterSource(EvalState & state, const Pos & pos, Value * * args
Path dstPath = settings.readOnlyMode
? computeStorePathForPath(path, true, htSHA256, filter).first
: store->addToStore(baseNameOf(path), path, true, htSHA256, filter, state.repair);
: state.store->addToStore(baseNameOf(path), path, true, htSHA256, filter, state.repair);
mkString(v, dstPath, singleton<PathSet>(dstPath));
}
@ -1678,7 +1677,7 @@ void fetch(EvalState & state, const Pos & pos, Value * * args, Value & v,
} else
url = state.forceStringNoCtx(*args[0], pos);
Path res = downloadFileCached(url, unpack);
Path res = downloadFileCached(state.store, url, unpack);
mkString(v, res, PathSet({res}));
}