From 9d1e7e2acc0e677b539d2463a78dfc1dc4f59985 Mon Sep 17 00:00:00 2001
From: Solomon Hykes <solomon@dagger.io>
Date: Sat, 12 Mar 2022 06:39:41 +0000
Subject: [PATCH] dagger.#Nop: work around bugs in the DAG resolver

Signed-off-by: Solomon Hykes <solomon@dagger.io>
---
 pkg/dagger.io/dagger/nop.cue | 10 ++++++++++
 plan/task/nop.go             | 20 ++++++++++++++++++++
 2 files changed, 30 insertions(+)
 create mode 100644 pkg/dagger.io/dagger/nop.cue
 create mode 100644 plan/task/nop.go

diff --git a/pkg/dagger.io/dagger/nop.cue b/pkg/dagger.io/dagger/nop.cue
new file mode 100644
index 00000000..4e1d2580
--- /dev/null
+++ b/pkg/dagger.io/dagger/nop.cue
@@ -0,0 +1,10 @@
+package dagger
+
+// A core action that does nothing
+// Useful to work around bugs in the DAG resolver.
+//  See for example https://github.com/dagger/dagger/issues/1789
+#Nop: {
+	$dagger: task: _name: "Nop"
+	input:  _
+	output: input
+}
diff --git a/plan/task/nop.go b/plan/task/nop.go
new file mode 100644
index 00000000..8a7dfc81
--- /dev/null
+++ b/plan/task/nop.go
@@ -0,0 +1,20 @@
+package task
+
+import (
+	"context"
+
+	"go.dagger.io/dagger/compiler"
+	"go.dagger.io/dagger/plancontext"
+	"go.dagger.io/dagger/solver"
+)
+
+func init() {
+	Register("Nop", func() Task { return &nopTask{} })
+}
+
+type nopTask struct {
+}
+
+func (t *nopTask) Run(ctx context.Context, pctx *plancontext.Context, s solver.Solver, v *compiler.Value) (*compiler.Value, error) {
+	return v, nil
+}