Merge pull request #5253 from edolstra/flake-ifd

Don't allow IFD in flakes by default

doc/manual/local.mk

@@ -92,7 +92,7 @@ doc/manual/generated/man1/nix3-manpages: $(d)/src/command-ref/new-cli
 	  lowdown -sT man -M section=1 $$tmpFile -o $(DESTDIR)$$(dirname $@)/$$name.1; \
 	  rm $$tmpFile; \
 	done
-	touch $@
+	@touch $@
 
 $(docdir)/manual/index.html: $(MANUAL_SRCS) $(d)/book.toml $(d)/custom.css $(d)/src/SUMMARY.md $(d)/src/command-ref/new-cli $(d)/src/command-ref/conf-file.md $(d)/src/expressions/builtins.md $(call rwildcard, $(d)/src, *.md)
 	$(trace-gen) RUST_LOG=warn mdbook build doc/manual -d $(DESTDIR)$(docdir)/manual

src/libexpr/primops.cc

@@ -52,7 +52,8 @@ void EvalState::realiseContext(const PathSet & context)
     if (drvs.empty()) return;
 
     if (!evalSettings.enableImportFromDerivation)
-        throw EvalError("attempted to realize '%1%' during evaluation but 'allow-import-from-derivation' is false",
+        throw Error(
+            "cannot build '%1%' during evaluation because the option 'allow-import-from-derivation' is disabled",
             store->printStorePath(drvs.begin()->drvPath));
 
     /* For performance, prefetch all substitute info. */

src/libstore/binary-cache-store.cc

@@ -52,9 +52,9 @@ void BinaryCacheStore::init()
                     throw Error("binary cache '%s' is for Nix stores with prefix '%s', not '%s'",
                         getUri(), value, storeDir);
             } else if (name == "WantMassQuery") {
-                wantMassQuery.setDefault(value == "1" ? "true" : "false");
+                wantMassQuery.setDefault(value == "1");
             } else if (name == "Priority") {
-                priority.setDefault(fmt("%d", std::stoi(value)));
+                priority.setDefault(std::stoi(value));
             }
         }
     }

src/libstore/http-binary-cache-store.cc

@@ -57,8 +57,8 @@ public:
     {
         // FIXME: do this lazily?
         if (auto cacheInfo = diskCache->cacheExists(cacheUri)) {
-            wantMassQuery.setDefault(cacheInfo->wantMassQuery ? "true" : "false");
-            priority.setDefault(fmt("%d", cacheInfo->priority));
+            wantMassQuery.setDefault(cacheInfo->wantMassQuery);
+            priority.setDefault(cacheInfo->priority);
         } else {
             try {
                 BinaryCacheStore::init();

src/libstore/s3-binary-cache-store.cc

@@ -232,8 +232,8 @@ struct S3BinaryCacheStoreImpl : virtual S3BinaryCacheStoreConfig, public virtual
     void init() override
     {
         if (auto cacheInfo = diskCache->cacheExists(getUri())) {
-            wantMassQuery.setDefault(cacheInfo->wantMassQuery ? "true" : "false");
-            priority.setDefault(fmt("%d", cacheInfo->priority));
+            wantMassQuery.setDefault(cacheInfo->wantMassQuery);
+            priority.setDefault(cacheInfo->priority);
         } else {
             BinaryCacheStore::init();
             diskCache->createCache(getUri(), storeDir, wantMassQuery, priority);

src/libutil/config.cc

@@ -177,11 +177,6 @@ AbstractSetting::AbstractSetting(
 {
 }
 
-void AbstractSetting::setDefault(const std::string & str)
-{
-    if (!overridden) set(str);
-}
-
 nlohmann::json AbstractSetting::toJSON()
 {
     return nlohmann::json(toJSONObject());

src/libutil/config.hh

@@ -194,8 +194,6 @@ public:
 
     bool overridden = false;
 
-    void setDefault(const std::string & str);
-
 protected:
 
     AbstractSetting(
@@ -253,6 +251,7 @@ public:
     bool operator !=(const T & v2) const { return value != v2; }
     void operator =(const T & v) { assign(v); }
     virtual void assign(const T & v) { value = v; }
+    void setDefault(const T & v) { if (!overridden) value = v; }
 
     void set(const std::string & str, bool append = false) override;
 

src/nix/flake.cc

@@ -131,8 +131,18 @@ static void enumerateOutputs(EvalState & state, Value & vFlake,
 
     state.forceAttrs(*aOutputs->value);
 
-    for (auto & attr : *aOutputs->value->attrs)
-        callback(attr.name, *attr.value, *attr.pos);
+    auto sHydraJobs = state.symbols.create("hydraJobs");
+
+    /* Hack: ensure that hydraJobs is evaluated before anything
+       else. This way we can disable IFD for hydraJobs and then enable
+       it for other outputs. */
+    if (auto attr = aOutputs->value->attrs->get(sHydraJobs))
+        callback(attr->name, *attr->value, *attr->pos);
+
+    for (auto & attr : *aOutputs->value->attrs) {
+        if (attr.name != sHydraJobs)
+            callback(attr.name, *attr.value, *attr.pos);
+    }
 }
 
 struct CmdFlakeMetadata : FlakeCommand, MixJSON
@@ -269,7 +279,10 @@ struct CmdFlakeCheck : FlakeCommand
 
     void run(nix::ref<nix::Store> store) override
     {
-        settings.readOnlyMode = !build;
+        if (!build) {
+            settings.readOnlyMode = true;
+            evalSettings.enableImportFromDerivation.setDefault(false);
+        }
 
         auto state = getEvalState();
 
@@ -381,9 +394,13 @@ struct CmdFlakeCheck : FlakeCommand
 
                 for (auto & attr : *v.attrs) {
                     state->forceAttrs(*attr.value, *attr.pos);
-                    if (!state->isDerivation(*attr.value))
-                        checkHydraJobs(attrPath + "." + (std::string) attr.name,
-                            *attr.value, *attr.pos);
+                    auto attrPath2 = attrPath + "." + (std::string) attr.name;
+                    if (state->isDerivation(*attr.value)) {
+                        Activity act(*logger, lvlChatty, actUnknown,
+                            fmt("checking Hydra job '%s'", attrPath2));
+                        checkDerivation(attrPath2, *attr.value, *attr.pos);
+                    } else
+                        checkHydraJobs(attrPath2, *attr.value, *attr.pos);
                 }
 
             } catch (Error & e) {
@@ -447,8 +464,8 @@ struct CmdFlakeCheck : FlakeCommand
                 if (!v.isLambda())
                     throw Error("bundler must be a function");
                 if (!v.lambda.fun->formals ||
-                    v.lambda.fun->formals->argNames.find(state->symbols.create("program")) == v.lambda.fun->formals->argNames.end() ||
-                    v.lambda.fun->formals->argNames.find(state->symbols.create("system")) == v.lambda.fun->formals->argNames.end())
+                    !v.lambda.fun->formals->argNames.count(state->symbols.create("program")) ||
+                    !v.lambda.fun->formals->argNames.count(state->symbols.create("system")))
                     throw Error("bundler must take formal arguments 'program' and 'system'");
             } catch (Error & e) {
                 e.addTrace(pos, hintfmt("while checking the template '%s'", attrPath));
@@ -469,6 +486,8 @@ struct CmdFlakeCheck : FlakeCommand
                         fmt("checking flake output '%s'", name));
 
                     try {
+                        evalSettings.enableImportFromDerivation.setDefault(name != "hydraJobs");
+
                         state->forceValue(vOutput, pos);
 
                         if (name == "checks") {
@@ -603,7 +622,7 @@ struct CmdFlakeCheck : FlakeCommand
             store->buildPaths(drvPaths);
         }
         if (hasErrors)
-            throw Error("Some errors were encountered during the evaluation");
+            throw Error("some errors were encountered during the evaluation");
     }
 };
 
@@ -873,6 +892,8 @@ struct CmdFlakeShow : FlakeCommand, MixJSON
 
     void run(nix::ref<nix::Store> store) override
     {
+        evalSettings.enableImportFromDerivation.setDefault(false);
+
         auto state = getEvalState();
         auto flake = std::make_shared<LockedFlake>(lockFlake());
 

src/nix/search.cc

@@ -62,6 +62,7 @@ struct CmdSearch : InstallableCommand, MixJSON
     void run(ref<Store> store) override
     {
         settings.readOnlyMode = true;
+        evalSettings.enableImportFromDerivation.setDefault(false);
 
         // Empty search string should match all packages
         // Use "^" here instead of ".*" due to differences in resulting highlighting