do: verify the action exists before running

Signed-off-by: Andrea Luzzardi <aluzzardi@gmail.com>

plan/plan.go

@@ -175,17 +175,19 @@ func (p *Plan) fillAction() {
 		noOpRunner,
 	)
 
-	actions := p.source.LookupPath(cue.MakePath(ActionSelector))
-	actionsComment := ""
-	for _, cg := range actions.Doc() {
-		actionsComment += cg.Text()
-	}
 	p.action = &Action{
-		ActionSelector.String(),
-		false,
-		actions.Path(),
-		actionsComment,
-		[]*Action{},
+		Name:     ActionSelector.String(),
+		Hidden:   false,
+		Path:     cue.MakePath(ActionSelector),
+		Children: []*Action{},
+	}
+
+	actions := p.source.LookupPath(cue.MakePath(ActionSelector))
+	if actions.Exists() {
+		return
+	}
+	for _, cg := range actions.Doc() {
+		p.action.Comment += cg.Text()
 	}
 
 	tasks := flow.Tasks()
@@ -205,11 +207,11 @@ func (p *Plan) fillAction() {
 				}
 
 				a = &Action{
-					s.String(),
-					s.PkgPath() != "",
-					path,
-					childComment,
-					[]*Action{},
+					Name:     s.String(),
+					Hidden:   s.PkgPath() != "",
+					Path:     path,
+					Comment:  childComment,
+					Children: []*Action{},
 				}
 				prevAction.AddChild(a)
 			}

plan/runner.go

@@ -38,6 +38,10 @@ func NewRunner(pctx *plancontext.Context, target cue.Path, s solver.Solver) *Run
 }
 
 func (r *Runner) Run(ctx context.Context, src *compiler.Value) error {
+	if !src.LookupPath(r.target).Exists() {
+		return fmt.Errorf("%s not found", r.target.String())
+	}
+
 	if err := r.update(cue.MakePath(), src); err != nil {
 		return err
 	}

tests/plan.bats

@@ -4,7 +4,13 @@ setup() {
     common_setup
 }
 
-@test "plan/do dynamic tasks - fails to find tasks" {
+@test "plan/do: action sanity checks" {
+  run "$DAGGER" "do" -p ./plan/do/actions.cue not exist
+  assert_failure
+  assert_output --partial "not found"
+}
+
+@test "plan/do: dynamic tasks - fails to find tasks" {
   # Europa loader handles the cwd differently, therefore we need to CD into the tree at or below the parent of cue.mod
   cd "$TESTDIR"
   run "$DAGGER" "do" -p ./plan/do/dynamic_tasks.cue test b
@@ -12,12 +18,12 @@ setup() {
   refute_output --partial "actions.test.b"
 }
 
-@test "plan/do dynamic tasks - fails to run tasks" {
+@test "plan/do: dynamic tasks - fails to run tasks" {
   run "$DAGGER" "do" -p ./plan/do/dynamic_tasks.cue "test"
   refute_output --partial 'actions.test.b.y'
 }
 
-@test "plan/do don't run unspecified tasks" {
+@test "plan/do: don't run unspecified tasks" {
   run "$DAGGER" "do" -p ./plan/do/do_not_run_unspecified_tasks.cue test
   assert_output --partial "actions.test.one.script"
   assert_output --partial "actions.test.three.script"
@@ -32,7 +38,6 @@ setup() {
   refute_output --partial 'client.filesystem."./dependent_do".write'
 }
 
-
 @test "plan/hello" {
   # Europa loader handles the cwd differently, therefore we need to CD into the tree at or below the parent of cue.mod
   cd "$TESTDIR"