Address feedback.

cli/integration_tests/dry_json/monorepo.t

@@ -121,7 +121,7 @@ Setup
     },
     "expandedOutputs": [],
     "framework": "<NO FRAMEWORK DETECTED>",
-    "envMode": "infer",
+    "envMode": "loose",
     "environmentVariables": {
       "configured": [],
       "inferred": [],
@@ -170,7 +170,7 @@ Setup
     },
     "expandedOutputs": [],
     "framework": "<NO FRAMEWORK DETECTED>",
-    "envMode": "infer",
+    "envMode": "loose",
     "environmentVariables": {
       "configured": [
         "NODE_ENV="

cli/integration_tests/dry_json/single_package.t

@@ -69,7 +69,7 @@ Setup
         },
         "expandedOutputs": [],
         "framework": "\u003cNO FRAMEWORK DETECTED\u003e",
-        "envMode": "infer",
+        "envMode": "loose",
         "environmentVariables": {
           "configured": [],
           "inferred": [],

cli/integration_tests/dry_json/single_package_no_config.t

@@ -60,7 +60,7 @@ Setup
         },
         "expandedOutputs": [],
         "framework": "\u003cNO FRAMEWORK DETECTED\u003e",
-        "envMode": "infer",
+        "envMode": "loose",
         "environmentVariables": {
           "configured": [],
           "inferred": [],

cli/integration_tests/dry_json/single_package_with_deps.t

@@ -80,7 +80,7 @@ Setup
         },
         "expandedOutputs": [],
         "framework": "\u003cNO FRAMEWORK DETECTED\u003e",
-        "envMode": "infer",
+        "envMode": "loose",
         "environmentVariables": {
           "configured": [],
           "inferred": [],
@@ -128,7 +128,7 @@ Setup
         },
         "expandedOutputs": [],
         "framework": "\u003cNO FRAMEWORK DETECTED\u003e",
-        "envMode": "infer",
+        "envMode": "loose",
         "environmentVariables": {
           "configured": [],
           "inferred": [],

cli/integration_tests/run_summary/error.t

@@ -61,7 +61,7 @@ Validate that we got a full task summary for the failed task with an error in .e
     },
     "expandedOutputs": [],
     "framework": "",
-    "envMode": "infer",
+    "envMode": "loose",
     "environmentVariables": {
       "configured": [],
       "inferred": [],

cli/internal/graph/graph.go

@@ -80,8 +80,18 @@ func (g *CompleteGraph) GetPackageTaskVisitor(
 
 		// Task env mode is only independent when global env mode is `infer`.
 		taskEnvMode := globalEnvMode
-		if taskEnvMode == util.Infer && taskDefinition.PassthroughEnv != nil {
-			taskEnvMode = util.Strict
+		useOldTaskHashable := false
+		if taskEnvMode == util.Infer {
+			if taskDefinition.PassthroughEnv != nil {
+				taskEnvMode = util.Strict
+			} else {
+				// If we're in infer mode we have just detected non-usage of strict env vars.
+				// Since we haven't stabilized this we don't want to break their cache.
+				useOldTaskHashable = true
+
+				// But our old behavior's actual meaning of this state is `loose`.
+				taskEnvMode = util.Loose
+			}
 		}
 
 		// TODO: maybe we can remove this PackageTask struct at some point
@@ -103,6 +113,7 @@ func (g *CompleteGraph) GetPackageTaskVisitor(
 			taskGraph.DownEdges(taskID),
 			logger,
 			passThruArgs,
+			useOldTaskHashable,
 		)
 
 		// Not being able to construct the task hash is a hard error

cli/internal/run/dry_run.go

@@ -28,18 +28,14 @@ func DryRun(
 	_ *taskhash.Tracker, // unused, but keep here for parity with RealRun method signature
 	turboCache cache.Cache,
 	turboJSON *fs.TurboJSON,
+	globalEnvMode util.EnvMode,
 	base *cmdutil.CmdBase,
 	summary runsummary.Meta,
 ) error {
 	defer turboCache.Shutdown()
 
 	taskSummaries := []*runsummary.TaskSummary{}
 
-	globalEnvMode := rs.Opts.runOpts.EnvMode
-	if globalEnvMode == util.Infer && turboJSON.GlobalPassthroughEnv != nil {
-		globalEnvMode = util.Strict
-	}
-
 	mu := sync.Mutex{}
 	execFunc := func(ctx gocontext.Context, packageTask *nodes.PackageTask, taskSummary *runsummary.TaskSummary) error {
 		// Assign some fallbacks if they were missing

cli/internal/run/global_hash.go

@@ -72,9 +72,14 @@ func calculateGlobalHashFromHashable(full GlobalHashable) (string, error) {
 		// Remove the passthroughs from hash consideration if we're explicitly loose.
 		full.envVarPassthroughs = nil
 		return fs.HashObject(full)
-	default:
-		// When we aren't in infer or loose mode we can hash the whole object as is.
+	case util.Strict:
+		// Collapse `nil` and `[]` in strict mode.
+		if full.envVarPassthroughs == nil {
+			full.envVarPassthroughs = make([]string, 0)
+		}
 		return fs.HashObject(full)
+	default:
+		panic("unimplemented environment mode")
 	}
 }
 

cli/internal/run/real_run.go

@@ -42,6 +42,7 @@ func RealRun(
 	taskHashTracker *taskhash.Tracker,
 	turboCache cache.Cache,
 	turboJSON *fs.TurboJSON,
+	globalEnvMode util.EnvMode,
 	packagesInScope []string,
 	base *cmdutil.CmdBase,
 	runSummary runsummary.Meta,
@@ -72,11 +73,6 @@ func RealRun(
 
 	runCache := runcache.New(turboCache, base.RepoRoot, rs.Opts.runcacheOpts, colorCache)
 
-	globalEnvMode := rs.Opts.runOpts.EnvMode
-	if globalEnvMode == util.Infer && turboJSON.GlobalPassthroughEnv != nil {
-		globalEnvMode = util.Strict
-	}
-
 	ec := &execContext{
 		colorCache:      colorCache,
 		runSummary:      runSummary,

cli/internal/run/run.go

@@ -354,6 +354,11 @@ func (r *run) run(ctx gocontext.Context, targets []string) error {
 		}
 	}
 
+	globalEnvMode := rs.Opts.runOpts.EnvMode
+	if globalEnvMode == util.Infer && turboJSON.GlobalPassthroughEnv != nil {
+		globalEnvMode = util.Strict
+	}
+
 	// RunSummary contains information that is statically analyzable about
 	// the tasks that we expect to run based on the user command.
 	summary := runsummary.NewRunSummary(
@@ -386,6 +391,7 @@ func (r *run) run(ctx gocontext.Context, targets []string) error {
 			taskHashTracker,
 			turboCache,
 			turboJSON,
+			globalEnvMode,
 			r.base,
 			summary,
 		)
@@ -400,6 +406,7 @@ func (r *run) run(ctx gocontext.Context, targets []string) error {
 		taskHashTracker,
 		turboCache,
 		turboJSON,
+		globalEnvMode,
 		packagesInScope,
 		r.base,
 		summary,

cli/internal/taskhash/taskhash.go

@@ -304,20 +304,9 @@ type oldTaskHashable struct {
 }
 
 // calculateTaskHashFromHashable returns a hash string from the taskHashable
-func calculateTaskHashFromHashable(full *taskHashable) (string, error) {
-	switch full.envMode {
-	case util.Infer:
-		if full.passthroughEnv != nil {
-			// In infer mode, if there is any passThru config (even if it is an empty array)
-			// we'll hash the whole object, so we can detect changes to that config
-			// Further, resolve the envMode to the concrete value.
-			full.envMode = util.Strict
-			return fs.HashObject(full)
-		}
-
-		// If we're in infer mode, and there is no global pass through config,
-		// we can use the old anonymous struct. this will be true for everyone not using the strict env
-		// feature, and we don't want to break their cache.
+func calculateTaskHashFromHashable(full *taskHashable, useOldTaskHashable bool) (string, error) {
+	// The user is not using the strict environment variables feature.
+	if useOldTaskHashable {
 		return fs.HashObject(&oldTaskHashable{
 			packageDir:           full.packageDir,
 			hashOfFiles:          full.hashOfFiles,
@@ -329,13 +318,23 @@ func calculateTaskHashFromHashable(full *taskHashable) (string, error) {
 			globalHash:           full.globalHash,
 			taskDependencyHashes: full.taskDependencyHashes,
 		})
+	}
+
+	switch full.envMode {
 	case util.Loose:
 		// Remove the passthroughs from hash consideration if we're explicitly loose.
 		full.passthroughEnv = nil
 		return fs.HashObject(full)
-	default:
-		// When we aren't in infer or loose mode we can hash the whole object as is.
+	case util.Strict:
+		// Collapse `nil` and `[]` in strict mode.
+		if full.passthroughEnv == nil {
+			full.passthroughEnv = make([]string, 0)
+		}
 		return fs.HashObject(full)
+	case util.Infer:
+		panic("task inferred status should have already been resolved")
+	default:
+		panic("unimplemented environment mode")
 	}
 }
 
@@ -370,7 +369,7 @@ func (th *Tracker) calculateDependencyHashes(dependencySet dag.Set) ([]string, e
 // CalculateTaskHash calculates the hash for package-task combination. It is threadsafe, provided
 // that it has previously been called on its task-graph dependencies. File hashes must be calculated
 // first.
-func (th *Tracker) CalculateTaskHash(packageTask *nodes.PackageTask, dependencySet dag.Set, logger hclog.Logger, args []string) (string, error) {
+func (th *Tracker) CalculateTaskHash(packageTask *nodes.PackageTask, dependencySet dag.Set, logger hclog.Logger, args []string, useOldTaskHashable bool) (string, error) {
 	pfs := specFromPackageTask(packageTask)
 	pkgFileHashKey := pfs.ToKey()
 
@@ -416,7 +415,7 @@ func (th *Tracker) CalculateTaskHash(packageTask *nodes.PackageTask, dependencyS
 		hashableEnvPairs:     hashableEnvPairs,
 		globalHash:           th.globalHash,
 		taskDependencyHashes: taskDependencyHashes,
-	})
+	}, useOldTaskHashable)
 	if err != nil {
 		return "", fmt.Errorf("failed to hash task %v: %v", packageTask.TaskID, hash)
 	}