The job should always run when `if` is `always()` (#29464) (#29469)

Backport #29464 by @Zettat123

Fix #27906

According to GitHub's
[documentation](https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#jobsjob_idneeds),
a job should always run when its `if` is `always()`

> If you would like a job to run even if a job it is dependent on did
not succeed, use the `always()` conditional expression in
`jobs.<job_id>.if`.

Co-authored-by: Zettat123 <zettat123@gmail.com>

services/actions/job_emitter.go

@@ -7,12 +7,14 @@ import (
 	"context"
 	"errors"
 	"fmt"
+	"strings"
 
 	actions_model "code.gitea.io/gitea/models/actions"
 	"code.gitea.io/gitea/models/db"
 	"code.gitea.io/gitea/modules/graceful"
 	"code.gitea.io/gitea/modules/queue"
 
+	"github.com/nektos/act/pkg/jobparser"
 	"xorm.io/builder"
 )
 
@@ -76,12 +78,15 @@ func checkJobsOfRun(ctx context.Context, runID int64) error {
 type jobStatusResolver struct {
 	statuses map[int64]actions_model.Status
 	needs    map[int64][]int64
+	jobMap   map[int64]*actions_model.ActionRunJob
 }
 
 func newJobStatusResolver(jobs actions_model.ActionJobList) *jobStatusResolver {
 	idToJobs := make(map[string][]*actions_model.ActionRunJob, len(jobs))
+	jobMap := make(map[int64]*actions_model.ActionRunJob)
 	for _, job := range jobs {
 		idToJobs[job.JobID] = append(idToJobs[job.JobID], job)
+		jobMap[job.ID] = job
 	}
 
 	statuses := make(map[int64]actions_model.Status, len(jobs))
@@ -97,6 +102,7 @@ func newJobStatusResolver(jobs actions_model.ActionJobList) *jobStatusResolver {
 	return &jobStatusResolver{
 		statuses: statuses,
 		needs:    needs,
+		jobMap:   jobMap,
 	}
 }
 
@@ -135,7 +141,20 @@ func (r *jobStatusResolver) resolve() map[int64]actions_model.Status {
 			if allSucceed {
 				ret[id] = actions_model.StatusWaiting
 			} else {
-				ret[id] = actions_model.StatusSkipped
+				// If a job's "if" condition is "always()", the job should always run even if some of its dependencies did not succeed.
+				// See https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#jobsjob_idneeds
+				always := false
+				if wfJobs, _ := jobparser.Parse(r.jobMap[id].WorkflowPayload); len(wfJobs) == 1 {
+					_, wfJob := wfJobs[0].Job()
+					expr := strings.TrimSpace(strings.TrimSuffix(strings.TrimPrefix(wfJob.If.Value, "${{"), "}}"))
+					always = expr == "always()"
+				}
+
+				if always {
+					ret[id] = actions_model.StatusWaiting
+				} else {
+					ret[id] = actions_model.StatusSkipped
+				}
 			}
 		}
 	}

services/actions/job_emitter_test.go

@@ -70,6 +70,62 @@ func Test_jobStatusResolver_Resolve(t *testing.T) {
 			},
 			want: map[int64]actions_model.Status{},
 		},
+		{
+			name: "with ${{ always() }} condition",
+			jobs: actions_model.ActionJobList{
+				{ID: 1, JobID: "job1", Status: actions_model.StatusFailure, Needs: []string{}},
+				{ID: 2, JobID: "job2", Status: actions_model.StatusBlocked, Needs: []string{"job1"}, WorkflowPayload: []byte(
+					`
+name: test
+on: push
+jobs:
+  job2:
+    runs-on: ubuntu-latest
+    needs: job1
+    if: ${{ always() }}
+    steps:
+      - run: echo "always run"
+`)},
+			},
+			want: map[int64]actions_model.Status{2: actions_model.StatusWaiting},
+		},
+		{
+			name: "with always() condition",
+			jobs: actions_model.ActionJobList{
+				{ID: 1, JobID: "job1", Status: actions_model.StatusFailure, Needs: []string{}},
+				{ID: 2, JobID: "job2", Status: actions_model.StatusBlocked, Needs: []string{"job1"}, WorkflowPayload: []byte(
+					`
+name: test
+on: push
+jobs:
+  job2:
+    runs-on: ubuntu-latest
+    needs: job1
+    if: always()
+    steps:
+      - run: echo "always run"
+`)},
+			},
+			want: map[int64]actions_model.Status{2: actions_model.StatusWaiting},
+		},
+		{
+			name: "without always() condition",
+			jobs: actions_model.ActionJobList{
+				{ID: 1, JobID: "job1", Status: actions_model.StatusFailure, Needs: []string{}},
+				{ID: 2, JobID: "job2", Status: actions_model.StatusBlocked, Needs: []string{"job1"}, WorkflowPayload: []byte(
+					`
+name: test
+on: push
+jobs:
+  job2:
+    runs-on: ubuntu-latest
+    needs: job1
+    steps:
+      - run: echo "not always run"
+`)},
+			},
+			want: map[int64]actions_model.Status{2: actions_model.StatusSkipped},
+		},
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {