Add e2e pipeline restart test

e2e/scenarios/restart_test.go

@@ -0,0 +1,91 @@
+// Copyright 2026 Woodpecker Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//go:build test
+
+package scenarios
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+
+	"go.woodpecker-ci.org/woodpecker/v3/e2e/setup"
+	forge_types "go.woodpecker-ci.org/woodpecker/v3/server/forge/types"
+	"go.woodpecker-ci.org/woodpecker/v3/server/model"
+	"go.woodpecker-ci.org/woodpecker/v3/server/pipeline"
+)
+
+// TestRestartPipeline verifies pipeline.Restart produces a distinct pipeline
+// linked to the original via Parent, with its own fresh workflow rows, and
+// that the original's workflows are untouched.
+func TestRestartPipeline(t *testing.T) {
+	env := setup.StartServer(t.Context(), t, []*forge_types.FileMeta{
+		{Name: ".woodpecker.yaml", Data: simpleSuccessYAML},
+	})
+	agent := setup.StartAgent(t.Context(), t, env.GRPCAddr)
+	setup.WaitForAgentRegistered(t, env.Store, agent)
+
+	// First run.
+	original, err := pipeline.Create(t.Context(), env.Store, env.Fixtures.Repo, &model.Pipeline{
+		Event:  model.EventPush,
+		Branch: "main",
+		Commit: "deadbeef",
+		Ref:    "refs/heads/main",
+		Author: env.Fixtures.Owner.Login,
+		Sender: env.Fixtures.Owner.Login,
+	})
+	require.NoError(t, err, "create original pipeline")
+	originalFinished := setup.WaitForPipeline(t, env.Store, original.ID)
+	require.Equal(t, model.StatusSuccess, originalFinished.Status, "original should succeed")
+
+	originalWorkflows, err := env.Store.WorkflowGetTree(originalFinished)
+	require.NoError(t, err)
+	require.Len(t, originalWorkflows, 1, "original should have exactly one workflow")
+
+	// Restart it.
+	restarted, err := pipeline.Restart(t.Context(), env.Store, originalFinished, env.Fixtures.Owner, env.Fixtures.Repo, nil)
+	require.NoError(t, err, "restart pipeline")
+	require.NotNil(t, restarted)
+
+	// Parent/ID invariants.
+	assert.NotEqual(t, originalFinished.ID, restarted.ID, "restart should have a new ID")
+	assert.NotEqual(t, originalFinished.Number, restarted.Number, "restart should have a new number")
+	assert.Equal(t, originalFinished.Number, restarted.Parent, "restart.Parent should point at original.Number")
+
+	// The restart runs through the same start path — wait for it to finish.
+	restartedFinished := setup.WaitForPipeline(t, env.Store, restarted.ID)
+	assert.Equal(t, model.StatusSuccess, restartedFinished.Status, "restarted pipeline should succeed")
+
+	// Restart should have its OWN workflows, not reuse the originals.
+	restartedWorkflows, err := env.Store.WorkflowGetTree(restartedFinished)
+	require.NoError(t, err)
+	require.Len(t, restartedWorkflows, 1, "restart should produce its own workflow")
+	assert.NotEqual(t, originalWorkflows[0].ID, restartedWorkflows[0].ID,
+		"restart should insert a new workflow row, not reassign the original")
+	assert.Equal(t, restartedFinished.ID, restartedWorkflows[0].PipelineID,
+		"restarted workflow must be linked to the restarted pipeline")
+	assert.Equal(t, model.StatusSuccess, restartedWorkflows[0].State)
+	assert.Greater(t, restartedWorkflows[0].AgentID, int64(0))
+
+	// Original's workflows must remain pointing at the original pipeline.
+	originalAfter, err := env.Store.WorkflowGetTree(originalFinished)
+	require.NoError(t, err)
+	require.Len(t, originalAfter, 1)
+	assert.Equal(t, originalWorkflows[0].ID, originalAfter[0].ID,
+		"restart must not mutate the original's workflow row")
+	assert.Equal(t, originalFinished.ID, originalAfter[0].PipelineID,
+		"original's workflow must still be linked to the original pipeline")
+}