fix: forward env to RunCommand when evaluating sh vars (#1869)

* forward env to RunCommand when evaluating sh vars. fixes #1742

* feat: added tests

* fix: test

---------

Co-authored-by: Pete Davison <pd93.uk@outlook.com>

internal/compiler/compiler.go

@@ -9,6 +9,7 @@ import (
 	"strings"
 	"sync"
 
+	"github.com/go-task/task/v3/internal/env"
 	"github.com/go-task/task/v3/internal/execext"
 	"github.com/go-task/task/v3/internal/filepathext"
 	"github.com/go-task/task/v3/internal/logger"
@@ -79,7 +80,7 @@ func (c *Compiler) getVariables(t *ast.Task, call *ast.Call, evaluateShVars bool
 				return nil
 			}
 			// If the variable is dynamic, we need to resolve it first
-			static, err := c.HandleDynamicVar(newVar, dir)
+			static, err := c.HandleDynamicVar(newVar, dir, env.GetFromVars(result))
 			if err != nil {
 				return err
 			}
@@ -131,7 +132,7 @@ func (c *Compiler) getVariables(t *ast.Task, call *ast.Call, evaluateShVars bool
 	return result, nil
 }
 
-func (c *Compiler) HandleDynamicVar(v ast.Var, dir string) (string, error) {
+func (c *Compiler) HandleDynamicVar(v ast.Var, dir string, e []string) (string, error) {
 	c.muDynamicCache.Lock()
 	defer c.muDynamicCache.Unlock()
 
@@ -158,6 +159,7 @@ func (c *Compiler) HandleDynamicVar(v ast.Var, dir string) (string, error) {
 		Dir:     dir,
 		Stdout:  &stdout,
 		Stderr:  c.Logger.Stderr,
+		Env:     e,
 	}
 	if err := execext.RunCommand(context.Background(), opts); err != nil {
 		return "", fmt.Errorf(`task: Command "%s" failed: %s`, opts.Command, err)

internal/env/env.go

@@ -12,8 +12,14 @@ func Get(t *ast.Task) []string {
 	if t.Env == nil {
 		return nil
 	}
+
+	return GetFromVars(t.Env)
+}
+
+func GetFromVars(env *ast.Vars) []string {
 	environ := os.Environ()
-	for k, v := range t.Env.ToCacheMap() {
+
+	for k, v := range env.ToCacheMap() {
 		if !isTypeAllowed(v) {
 			continue
 		}

task_test.go

@@ -130,6 +130,7 @@ func TestEnv(t *testing.T) {
 			"global.txt":         "FOO='foo' BAR='overridden' BAZ='baz'\n",
 			"multiple_type.txt":  "FOO='1' BAR='true' BAZ='1.1'\n",
 			"not-overridden.txt": "QUX='from_os'\n",
+			"dynamic.txt":        "foo\n",
 		},
 	}
 	tt.Run(t)

testdata/env/Taskfile.yml

@@ -17,6 +17,7 @@ tasks:
       - task: global
       - task: not-overridden
       - task: multiple_type
+      - task: dynamic
 
   local:
     vars:
@@ -50,3 +51,11 @@ tasks:
   overridden:
     cmds:
       - echo "QUX='$QUX'" > overridden.txt
+
+  dynamic:
+    silent: true
+    vars:
+      DYNAMIC_FOO:
+        sh: echo $FOO
+    cmds:
+      - echo "{{ .DYNAMIC_FOO }}" > dynamic.txt

variables.go

@@ -8,6 +8,7 @@ import (
 	"github.com/joho/godotenv"
 
 	"github.com/go-task/task/v3/errors"
+	"github.com/go-task/task/v3/internal/env"
 	"github.com/go-task/task/v3/internal/execext"
 	"github.com/go-task/task/v3/internal/filepathext"
 	"github.com/go-task/task/v3/internal/fingerprint"
@@ -115,7 +116,7 @@ func (e *Executor) compiledTask(call *ast.Call, evaluateShVars bool) (*ast.Task,
 				new.Env.Set(k, ast.Var{Value: v.Value})
 				return nil
 			}
-			static, err := e.Compiler.HandleDynamicVar(v, new.Dir)
+			static, err := e.Compiler.HandleDynamicVar(v, new.Dir, env.GetFromVars(new.Env))
 			if err != nil {
 				return err
 			}