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-rw-r--r--src/libexpr/attr-set.cc3
-rw-r--r--src/libexpr/attr-set.hh2
-rw-r--r--src/libexpr/eval.cc42
-rw-r--r--src/libexpr/eval.hh5
-rw-r--r--src/libexpr/lexer.l7
-rw-r--r--src/libexpr/names.cc2
-rw-r--r--src/libexpr/names.hh2
-rw-r--r--src/libexpr/primops.cc181
-rw-r--r--src/libexpr/primops.hh3
9 files changed, 184 insertions, 63 deletions
diff --git a/src/libexpr/attr-set.cc b/src/libexpr/attr-set.cc
index 910428c02686..b284daa3c2f7 100644
--- a/src/libexpr/attr-set.cc
+++ b/src/libexpr/attr-set.cc
@@ -7,13 +7,14 @@
 namespace nix {
 
 
+/* Note: Various places expect the allocated memory to be zeroed. */
 static void * allocBytes(size_t n)
 {
     void * p;
 #if HAVE_BOEHMGC
     p = GC_malloc(n);
 #else
-    p = malloc(n);
+    p = calloc(n, 1);
 #endif
     if (!p) throw std::bad_alloc();
     return p;
diff --git a/src/libexpr/attr-set.hh b/src/libexpr/attr-set.hh
index e1fc2bf6d796..3119a1848af2 100644
--- a/src/libexpr/attr-set.hh
+++ b/src/libexpr/attr-set.hh
@@ -83,7 +83,7 @@ public:
         for (size_t n = 0; n < size_; n++)
             res.emplace_back(&attrs[n]);
         std::sort(res.begin(), res.end(), [](const Attr * a, const Attr * b) {
-            return (string) a->name < (string) b->name;
+            return (const string &) a->name < (const string &) b->name;
         });
         return res;
     }
diff --git a/src/libexpr/eval.cc b/src/libexpr/eval.cc
index 33a9bc614285..2144d3452579 100644
--- a/src/libexpr/eval.cc
+++ b/src/libexpr/eval.cc
@@ -43,13 +43,14 @@ static char * dupString(const char * s)
 }
 
 
+/* Note: Various places expect the allocated memory to be zeroed. */
 static void * allocBytes(size_t n)
 {
     void * p;
 #if HAVE_BOEHMGC
     p = GC_malloc(n);
 #else
-    p = malloc(n);
+    p = calloc(n, 1);
 #endif
     if (!p) throw std::bad_alloc();
     return p;
@@ -293,6 +294,10 @@ EvalState::EvalState(const Strings & _searchPath, ref<Store> store)
     , sWrong(symbols.create("wrong"))
     , sStructuredAttrs(symbols.create("__structuredAttrs"))
     , sBuilder(symbols.create("builder"))
+    , sArgs(symbols.create("args"))
+    , sOutputHash(symbols.create("outputHash"))
+    , sOutputHashAlgo(symbols.create("outputHashAlgo"))
+    , sOutputHashMode(symbols.create("outputHashMode"))
     , repair(NoRepair)
     , store(store)
     , baseEnv(allocEnv(128))
@@ -378,6 +383,18 @@ void EvalState::checkURI(const std::string & uri)
             && (prefix[prefix.size() - 1] == '/' || uri[prefix.size()] == '/')))
             return;
 
+    /* If the URI is a path, then check it against allowedPaths as
+       well. */
+    if (hasPrefix(uri, "/")) {
+        checkSourcePath(uri);
+        return;
+    }
+
+    if (hasPrefix(uri, "file://")) {
+        checkSourcePath(std::string(uri, 7));
+        return;
+    }
+
     throw RestrictedPathError("access to URI '%s' is forbidden in restricted mode", uri);
 }
 
@@ -392,7 +409,7 @@ Path EvalState::toRealPath(const Path & path, const PathSet & context)
 };
 
 
-void EvalState::addConstant(const string & name, Value & v)
+Value * EvalState::addConstant(const string & name, Value & v)
 {
     Value * v2 = allocValue();
     *v2 = v;
@@ -400,12 +417,18 @@ void EvalState::addConstant(const string & name, Value & v)
     baseEnv.values[baseEnvDispl++] = v2;
     string name2 = string(name, 0, 2) == "__" ? string(name, 2) : name;
     baseEnv.values[0]->attrs->push_back(Attr(symbols.create(name2), v2));
+    return v2;
 }
 
 
 Value * EvalState::addPrimOp(const string & name,
     unsigned int arity, PrimOpFun primOp)
 {
+    if (arity == 0) {
+        Value v;
+        primOp(*this, noPos, nullptr, v);
+        return addConstant(name, v);
+    }
     Value * v = allocValue();
     string name2 = string(name, 0, 2) == "__" ? string(name, 2) : name;
     Symbol sym = symbols.create(name2);
@@ -564,9 +587,7 @@ Env & EvalState::allocEnv(unsigned int size)
     Env * env = (Env *) allocBytes(sizeof(Env) + size * sizeof(Value *));
     env->size = size;
 
-    /* Clear the values because maybeThunk() and lookupVar fromWith expect this. */
-    for (unsigned i = 0; i < size; ++i)
-        env->values[i] = 0;
+    /* We assume that env->values has been cleared by the allocator; maybeThunk() and lookupVar fromWith expect this. */
 
     return *env;
 }
@@ -1566,7 +1587,7 @@ string EvalState::copyPathToStore(PathSet & context, const Path & path)
         dstPath = srcToStore[path];
     else {
         dstPath = settings.readOnlyMode
-            ? store->computeStorePathForPath(checkSourcePath(path)).first
+            ? store->computeStorePathForPath(baseNameOf(path), checkSourcePath(path)).first
             : store->addToStore(baseNameOf(path), checkSourcePath(path), true, htSHA256, defaultPathFilter, repair);
         srcToStore[path] = dstPath;
         printMsg(lvlChatty, format("copied source '%1%' -> '%2%'")
@@ -1688,10 +1709,13 @@ void EvalState::printStats()
     printMsg(v, format("  time elapsed: %1%") % cpuTime);
     printMsg(v, format("  size of a value: %1%") % sizeof(Value));
     printMsg(v, format("  size of an attr: %1%") % sizeof(Attr));
-    printMsg(v, format("  environments allocated: %1% (%2% bytes)") % nrEnvs % bEnvs);
-    printMsg(v, format("  list elements: %1% (%2% bytes)") % nrListElems % bLists);
+    printMsg(v, format("  environments allocated count: %1%") % nrEnvs);
+    printMsg(v, format("  environments allocated bytes: %1%") % bEnvs);
+    printMsg(v, format("  list elements count: %1%") % nrListElems);
+    printMsg(v, format("  list elements bytes: %1%") % bLists);
     printMsg(v, format("  list concatenations: %1%") % nrListConcats);
-    printMsg(v, format("  values allocated: %1% (%2% bytes)") % nrValues % bValues);
+    printMsg(v, format("  values allocated count: %1%") % nrValues);
+    printMsg(v, format("  values allocated bytes: %1%") % bValues);
     printMsg(v, format("  sets allocated: %1% (%2% bytes)") % nrAttrsets % bAttrsets);
     printMsg(v, format("  right-biased unions: %1%") % nrOpUpdates);
     printMsg(v, format("  values copied in right-biased unions: %1%") % nrOpUpdateValuesCopied);
diff --git a/src/libexpr/eval.hh b/src/libexpr/eval.hh
index 9e3d30d95f49..9d8799b7906b 100644
--- a/src/libexpr/eval.hh
+++ b/src/libexpr/eval.hh
@@ -69,7 +69,8 @@ public:
     const Symbol sWith, sOutPath, sDrvPath, sType, sMeta, sName, sValue,
         sSystem, sOverrides, sOutputs, sOutputName, sIgnoreNulls,
         sFile, sLine, sColumn, sFunctor, sToString,
-        sRight, sWrong, sStructuredAttrs, sBuilder;
+        sRight, sWrong, sStructuredAttrs, sBuilder, sArgs,
+        sOutputHash, sOutputHashAlgo, sOutputHashMode;
     Symbol sDerivationNix;
 
     /* If set, force copying files to the Nix store even if they
@@ -210,7 +211,7 @@ private:
 
     void createBaseEnv();
 
-    void addConstant(const string & name, Value & v);
+    Value * addConstant(const string & name, Value & v);
 
     Value * addPrimOp(const string & name,
         unsigned int arity, PrimOpFun primOp);
diff --git a/src/libexpr/lexer.l b/src/libexpr/lexer.l
index 28a0a6a87896..e5e01fb5831a 100644
--- a/src/libexpr/lexer.l
+++ b/src/libexpr/lexer.l
@@ -49,9 +49,10 @@ static void adjustLoc(YYLTYPE * loc, const char * s, size_t len)
 }
 
 
-static Expr * unescapeStr(SymbolTable & symbols, const char * s)
+static Expr * unescapeStr(SymbolTable & symbols, const char * s, size_t length)
 {
     string t;
+    t.reserve(length);
     char c;
     while ((c = *s++)) {
         if (c == '\\') {
@@ -150,7 +151,7 @@ or          { return OR_KW; }
                 /* It is impossible to match strings ending with '$' with one
                    regex because trailing contexts are only valid at the end
                    of a rule. (A sane but undocumented limitation.) */
-                yylval->e = unescapeStr(data->symbols, yytext);
+                yylval->e = unescapeStr(data->symbols, yytext, yyleng);
                 return STR;
               }
 <STRING>\$\{  { PUSH_STATE(INSIDE_DOLLAR_CURLY); return DOLLAR_CURLY; }
@@ -178,7 +179,7 @@ or          { return OR_KW; }
                    return IND_STR;
                  }
 <IND_STRING>\'\'\\. {
-                   yylval->e = unescapeStr(data->symbols, yytext + 2);
+                   yylval->e = unescapeStr(data->symbols, yytext + 2, yyleng - 2);
                    return IND_STR;
                  }
 <IND_STRING>\$\{ { PUSH_STATE(INSIDE_DOLLAR_CURLY); return DOLLAR_CURLY; }
diff --git a/src/libexpr/names.cc b/src/libexpr/names.cc
index 6d78d2116121..382088c78872 100644
--- a/src/libexpr/names.cc
+++ b/src/libexpr/names.cc
@@ -41,7 +41,7 @@ bool DrvName::matches(DrvName & n)
 }
 
 
-static string nextComponent(string::const_iterator & p,
+string nextComponent(string::const_iterator & p,
     const string::const_iterator end)
 {
     /* Skip any dots and dashes (component separators). */
diff --git a/src/libexpr/names.hh b/src/libexpr/names.hh
index 9667fc96fd0f..13c3093e77b0 100644
--- a/src/libexpr/names.hh
+++ b/src/libexpr/names.hh
@@ -24,6 +24,8 @@ private:
 
 typedef list<DrvName> DrvNames;
 
+string nextComponent(string::const_iterator & p,
+    const string::const_iterator end);
 int compareVersions(const string & v1, const string & v2);
 DrvNames drvNamesFromArgs(const Strings & opArgs);
 
diff --git a/src/libexpr/primops.cc b/src/libexpr/primops.cc
index 975f0e8309e6..a800d24290ae 100644
--- a/src/libexpr/primops.cc
+++ b/src/libexpr/primops.cc
@@ -49,24 +49,38 @@ InvalidPathError::InvalidPathError(const Path & path) :
 void EvalState::realiseContext(const PathSet & context)
 {
     PathSet drvs;
+
     for (auto & i : context) {
         std::pair<string, string> decoded = decodeContext(i);
         Path ctx = decoded.first;
         assert(store->isStorePath(ctx));
         if (!store->isValidPath(ctx))
             throw InvalidPathError(ctx);
-        if (!decoded.second.empty() && nix::isDerivation(ctx))
+        if (!decoded.second.empty() && nix::isDerivation(ctx)) {
             drvs.insert(decoded.first + "!" + decoded.second);
+
+            /* Add the output of this derivation to the allowed
+               paths. */
+            if (allowedPaths) {
+                auto drv = store->derivationFromPath(decoded.first);
+                DerivationOutputs::iterator i = drv.outputs.find(decoded.second);
+                if (i == drv.outputs.end())
+                    throw Error("derivation '%s' does not have an output named '%s'", decoded.first, decoded.second);
+                allowedPaths->insert(i->second.path);
+            }
+        }
     }
-    if (!drvs.empty()) {
-        if (!settings.enableImportFromDerivation)
-            throw EvalError(format("attempted to realize '%1%' during evaluation but 'allow-import-from-derivation' is false") % *(drvs.begin()));
-        /* For performance, prefetch all substitute info. */
-        PathSet willBuild, willSubstitute, unknown;
-        unsigned long long downloadSize, narSize;
-        store->queryMissing(drvs, willBuild, willSubstitute, unknown, downloadSize, narSize);
-        store->buildPaths(drvs);
-    }
+
+    if (drvs.empty()) return;
+
+    if (!settings.enableImportFromDerivation)
+        throw EvalError(format("attempted to realize '%1%' during evaluation but 'allow-import-from-derivation' is false") % *(drvs.begin()));
+
+    /* For performance, prefetch all substitute info. */
+    PathSet willBuild, willSubstitute, unknown;
+    unsigned long long downloadSize, narSize;
+    store->queryMissing(drvs, willBuild, willSubstitute, unknown, downloadSize, narSize);
+    store->buildPaths(drvs);
 }
 
 
@@ -539,7 +553,7 @@ static void prim_derivationStrict(EvalState & state, const Pos & pos, Value * *
 
     for (auto & i : args[0]->attrs->lexicographicOrder()) {
         if (i->name == state.sIgnoreNulls) continue;
-        string key = i->name;
+        const string & key = i->name;
         vomit("processing attribute '%1%'", key);
 
         auto handleHashMode = [&](const std::string & s) {
@@ -575,7 +589,7 @@ static void prim_derivationStrict(EvalState & state, const Pos & pos, Value * *
 
             /* The `args' attribute is special: it supplies the
                command-line arguments to the builder. */
-            if (key == "args") {
+            if (i->name == state.sArgs) {
                 state.forceList(*i->value, pos);
                 for (unsigned int n = 0; n < i->value->listSize(); ++n) {
                     string s = state.coerceToString(posDrvName, *i->value->listElems()[n], context, true);
@@ -598,15 +612,13 @@ static void prim_derivationStrict(EvalState & state, const Pos & pos, Value * *
                         drv.builder = state.forceString(*i->value, context, posDrvName);
                     else if (i->name == state.sSystem)
                         drv.platform = state.forceStringNoCtx(*i->value, posDrvName);
-                    else if (i->name == state.sName)
-                        drvName = state.forceStringNoCtx(*i->value, posDrvName);
-                    else if (key == "outputHash")
+                    else if (i->name == state.sOutputHash)
                         outputHash = state.forceStringNoCtx(*i->value, posDrvName);
-                    else if (key == "outputHashAlgo")
+                    else if (i->name == state.sOutputHashAlgo)
                         outputHashAlgo = state.forceStringNoCtx(*i->value, posDrvName);
-                    else if (key == "outputHashMode")
+                    else if (i->name == state.sOutputHashMode)
                         handleHashMode(state.forceStringNoCtx(*i->value, posDrvName));
-                    else if (key == "outputs") {
+                    else if (i->name == state.sOutputs) {
                         /* Require ‘outputs’ to be a list of strings. */
                         state.forceList(*i->value, posDrvName);
                         Strings ss;
@@ -620,14 +632,10 @@ static void prim_derivationStrict(EvalState & state, const Pos & pos, Value * *
                     drv.env.emplace(key, s);
                     if (i->name == state.sBuilder) drv.builder = s;
                     else if (i->name == state.sSystem) drv.platform = s;
-                    else if (i->name == state.sName) {
-                        drvName = s;
-                        printMsg(lvlVomit, format("derivation name is '%1%'") % drvName);
-                    }
-                    else if (key == "outputHash") outputHash = s;
-                    else if (key == "outputHashAlgo") outputHashAlgo = s;
-                    else if (key == "outputHashMode") handleHashMode(s);
-                    else if (key == "outputs")
+                    else if (i->name == state.sOutputHash) outputHash = s;
+                    else if (i->name == state.sOutputHashAlgo) outputHashAlgo = s;
+                    else if (i->name == state.sOutputHashMode) handleHashMode(s);
+                    else if (i->name == state.sOutputs)
                         handleOutputs(tokenizeString<Strings>(s));
                 }
 
@@ -1009,20 +1017,13 @@ static void prim_toFile(EvalState & state, const Pos & pos, Value * * args, Valu
 }
 
 
-static void prim_filterSource(EvalState & state, const Pos & pos, Value * * args, Value & v)
+static void addPath(EvalState & state, const Pos & pos, const string & name, const Path & path_,
+    Value * filterFun, bool recursive, const Hash & expectedHash, Value & v)
 {
-    PathSet context;
-    Path path = state.coerceToPath(pos, *args[1], context);
-    if (!context.empty())
-        throw EvalError(format("string '%1%' cannot refer to other paths, at %2%") % path % pos);
-
-    state.forceValue(*args[0]);
-    if (args[0]->type != tLambda)
-        throw TypeError(format("first argument in call to 'filterSource' is not a function but %1%, at %2%") % showType(*args[0]) % pos);
-
-    path = state.checkSourcePath(path);
-
-    PathFilter filter = [&](const Path & path) {
+    const auto path = settings.pureEval && expectedHash ?
+        path_ :
+        state.checkSourcePath(path_);
+    PathFilter filter = filterFun ? ([&](const Path & path) {
         auto st = lstat(path);
 
         /* Call the filter function.  The first argument is the path,
@@ -1031,7 +1032,7 @@ static void prim_filterSource(EvalState & state, const Pos & pos, Value * * args
         mkString(arg1, path);
 
         Value fun2;
-        state.callFunction(*args[0], arg1, fun2, noPos);
+        state.callFunction(*filterFun, arg1, fun2, noPos);
 
         Value arg2;
         mkString(arg2,
@@ -1044,16 +1045,79 @@ static void prim_filterSource(EvalState & state, const Pos & pos, Value * * args
         state.callFunction(fun2, arg2, res, noPos);
 
         return state.forceBool(res, pos);
-    };
+    }) : defaultPathFilter;
 
-    Path dstPath = settings.readOnlyMode
-        ? state.store->computeStorePathForPath(path, true, htSHA256, filter).first
-        : state.store->addToStore(baseNameOf(path), path, true, htSHA256, filter, state.repair);
+    Path expectedStorePath;
+    if (expectedHash) {
+        expectedStorePath =
+            state.store->makeFixedOutputPath(recursive, expectedHash, name);
+    }
+    Path dstPath;
+    if (!expectedHash || !state.store->isValidPath(expectedStorePath)) {
+        dstPath = settings.readOnlyMode
+            ? state.store->computeStorePathForPath(name, path, recursive, htSHA256, filter).first
+            : state.store->addToStore(name, path, recursive, htSHA256, filter, state.repair);
+        if (expectedHash && expectedStorePath != dstPath) {
+            throw Error(format("store path mismatch in (possibly filtered) path added from '%1%'") % path);
+        }
+    } else
+        dstPath = expectedStorePath;
 
     mkString(v, dstPath, {dstPath});
 }
 
 
+static void prim_filterSource(EvalState & state, const Pos & pos, Value * * args, Value & v)
+{
+    PathSet context;
+    Path path = state.coerceToPath(pos, *args[1], context);
+    if (!context.empty())
+        throw EvalError(format("string '%1%' cannot refer to other paths, at %2%") % path % pos);
+
+    state.forceValue(*args[0]);
+    if (args[0]->type != tLambda)
+        throw TypeError(format("first argument in call to 'filterSource' is not a function but %1%, at %2%") % showType(*args[0]) % pos);
+
+    addPath(state, pos, baseNameOf(path), path, args[0], true, Hash(), v);
+}
+
+static void prim_path(EvalState & state, const Pos & pos, Value * * args, Value & v)
+{
+    state.forceAttrs(*args[0], pos);
+    Path path;
+    string name;
+    Value * filterFun = nullptr;
+    auto recursive = true;
+    Hash expectedHash;
+
+    for (auto & attr : *args[0]->attrs) {
+        const string & n(attr.name);
+        if (n == "path") {
+            PathSet context;
+            path = state.coerceToPath(*attr.pos, *attr.value, context);
+            if (!context.empty())
+                throw EvalError(format("string '%1%' cannot refer to other paths, at %2%") % path % *attr.pos);
+        } else if (attr.name == state.sName)
+            name = state.forceStringNoCtx(*attr.value, *attr.pos);
+        else if (n == "filter") {
+            state.forceValue(*attr.value);
+            filterFun = attr.value;
+        } else if (n == "recursive")
+            recursive = state.forceBool(*attr.value, *attr.pos);
+        else if (n == "sha256")
+            expectedHash = Hash(state.forceStringNoCtx(*attr.value, *attr.pos), htSHA256);
+        else
+            throw EvalError(format("unsupported argument '%1%' to 'addPath', at %2%") % attr.name % *attr.pos);
+    }
+    if (path.empty())
+        throw EvalError(format("'path' required, at %1%") % pos);
+    if (name.empty())
+        name = baseNameOf(path);
+
+    addPath(state, pos, name, path, filterFun, recursive, expectedHash, v);
+}
+
+
 /*************************************************************
  * Sets
  *************************************************************/
@@ -1068,8 +1132,11 @@ static void prim_attrNames(EvalState & state, const Pos & pos, Value * * args, V
     state.mkList(v, args[0]->attrs->size());
 
     size_t n = 0;
-    for (auto & i : args[0]->attrs->lexicographicOrder())
-        mkString(*(v.listElems()[n++] = state.allocValue()), i->name);
+    for (auto & i : *args[0]->attrs)
+        mkString(*(v.listElems()[n++] = state.allocValue()), i.name);
+
+    std::sort(v.listElems(), v.listElems() + n,
+              [](Value * v1, Value * v2) { return strcmp(v1->string.s, v2->string.s) < 0; });
 }
 
 
@@ -1891,6 +1958,26 @@ static void prim_compareVersions(EvalState & state, const Pos & pos, Value * * a
 }
 
 
+static void prim_splitVersion(EvalState & state, const Pos & pos, Value * * args, Value & v)
+{
+    string version = state.forceStringNoCtx(*args[0], pos);
+    auto iter = version.cbegin();
+    Strings components;
+    while (iter != version.cend()) {
+        auto component = nextComponent(iter, version.cend());
+        if (component.empty())
+            break;
+        components.emplace_back(std::move(component));
+    }
+    state.mkList(v, components.size());
+    unsigned int n = 0;
+    for (auto & component : components) {
+        auto listElem = v.listElems()[n++] = state.allocValue();
+        mkString(*listElem, std::move(component));
+    }
+}
+
+
 /*************************************************************
  * Networking
  *************************************************************/
@@ -2071,6 +2158,7 @@ void EvalState::createBaseEnv()
     addPrimOp("__fromJSON", 1, prim_fromJSON);
     addPrimOp("__toFile", 2, prim_toFile);
     addPrimOp("__filterSource", 2, prim_filterSource);
+    addPrimOp("__path", 1, prim_path);
 
     // Sets
     addPrimOp("__attrNames", 1, prim_attrNames);
@@ -2125,6 +2213,7 @@ void EvalState::createBaseEnv()
     // Versions
     addPrimOp("__parseDrvName", 1, prim_parseDrvName);
     addPrimOp("__compareVersions", 2, prim_compareVersions);
+    addPrimOp("__splitVersion", 1, prim_splitVersion);
 
     // Derivations
     addPrimOp("derivationStrict", 1, prim_derivationStrict);
diff --git a/src/libexpr/primops.hh b/src/libexpr/primops.hh
index 39d23b04a5ce..31bf3f84f6c7 100644
--- a/src/libexpr/primops.hh
+++ b/src/libexpr/primops.hh
@@ -9,6 +9,9 @@ struct RegisterPrimOp
 {
     typedef std::vector<std::tuple<std::string, size_t, PrimOpFun>> PrimOps;
     static PrimOps * primOps;
+    /* You can register a constant by passing an arity of 0. fun
+       will get called during EvalState initialization, so there
+       may be primops not yet added and builtins is not yet sorted. */
     RegisterPrimOp(std::string name, size_t arity, PrimOpFun fun);
 };
generated by cgit-pink 1.4.1 (git 2.44.2) at 2024-10-11T13·25+0000