feat: support offline mode (#2128)

* Add: Actions Offline Mode

* Add: Actions Offline Mode

---------

Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

4 files changed, 27 insertions, 18 deletions

diff --git a/pkg/common/git/git.go b/pkg/common/git/git.go
index bf77155..0a819b9 100644
--- a/pkg/common/git/git.go
+++ b/pkg/common/git/git.go
@@ -221,10 +221,11 @@ func findGitSlug(url string, githubInstance string) (string, string, error) {
 
 // NewGitCloneExecutorInput the input for the NewGitCloneExecutor
 type NewGitCloneExecutorInput struct {
-	URL   string
-	Ref   string
-	Dir   string
-	Token string
+	URL         string
+	Ref         string
+	Dir         string
+	Token       string
+	OfflineMode bool
 }
 
 // CloneIfRequired ...
@@ -302,12 +303,16 @@ func NewGitCloneExecutor(input NewGitCloneExecutorInput) common.Executor {
 			return err
 		}
 
+		isOfflineMode := input.OfflineMode
+
 		// fetch latest changes
 		fetchOptions, pullOptions := gitOptions(input.Token)
 
-		err = r.Fetch(&fetchOptions)
-		if err != nil && !errors.Is(err, git.NoErrAlreadyUpToDate) {
-			return err
+		if !isOfflineMode {
+			err = r.Fetch(&fetchOptions)
+			if err != nil && !errors.Is(err, git.NoErrAlreadyUpToDate) {
+				return err
+			}
 		}
 
 		var hash *plumbing.Hash
@@ -367,9 +372,10 @@ func NewGitCloneExecutor(input NewGitCloneExecutorInput) common.Executor {
 				return err
 			}
 		}
-
-		if err = w.Pull(&pullOptions); err != nil && err != git.NoErrAlreadyUpToDate {
-			logger.Debugf("Unable to pull %s: %v", refName, err)
+		if !isOfflineMode {
+			if err = w.Pull(&pullOptions); err != nil && err != git.NoErrAlreadyUpToDate {
+				logger.Debugf("Unable to pull %s: %v", refName, err)
+			}
 		}
 		logger.Debugf("Cloned %s to %s", input.URL, input.Dir)
 
diff --git a/pkg/runner/reusable_workflow.go b/pkg/runner/reusable_workflow.go
index b5e3d5b..7ce68e9 100644
--- a/pkg/runner/reusable_workflow.go
+++ b/pkg/runner/reusable_workflow.go
@@ -102,10 +102,11 @@ func cloneIfRequired(rc *RunContext, remoteReusableWorkflow remoteReusableWorkfl
 		func(ctx context.Context) error {
 			remoteReusableWorkflow.URL = rc.getGithubContext(ctx).ServerURL
 			return git.NewGitCloneExecutor(git.NewGitCloneExecutorInput{
-				URL:   remoteReusableWorkflow.CloneURL(),
-				Ref:   remoteReusableWorkflow.Ref,
-				Dir:   targetDirectory,
-				Token: rc.Config.Token,
+				URL:         remoteReusableWorkflow.CloneURL(),
+				Ref:         remoteReusableWorkflow.Ref,
+				Dir:         targetDirectory,
+				Token:       rc.Config.Token,
+				OfflineMode: rc.Config.ActionOfflineMode,
 			})(ctx)
 		},
 		nil,
diff --git a/pkg/runner/runner.go b/pkg/runner/runner.go
index 5a7b1ad..dd8afe5 100644
--- a/pkg/runner/runner.go
+++ b/pkg/runner/runner.go
@@ -23,6 +23,7 @@ type Config struct {
 	Actor                              string                       // the user that triggered the event
 	Workdir                            string                       // path to working directory
 	ActionCacheDir                     string                       // path used for caching action contents
+	ActionOfflineMode                  bool                         // when offline, use caching action contents
 	BindWorkdir                        bool                         // bind the workdir to the job container
 	EventName                          string                       // name of event to run
 	EventPath                          string                       // path to JSON file to use for event.json in containers
diff --git a/pkg/runner/step_action_remote.go b/pkg/runner/step_action_remote.go
index 4019388..5c8a8f2 100644
--- a/pkg/runner/step_action_remote.go
+++ b/pkg/runner/step_action_remote.go
@@ -106,10 +106,11 @@ func (sar *stepActionRemote) prepareActionExecutor() common.Executor {
 
 		actionDir := fmt.Sprintf("%s/%s", sar.RunContext.ActionCacheDir(), safeFilename(sar.Step.Uses))
 		gitClone := stepActionRemoteNewCloneExecutor(git.NewGitCloneExecutorInput{
-			URL:   sar.remoteAction.CloneURL(),
-			Ref:   sar.remoteAction.Ref,
-			Dir:   actionDir,
-			Token: github.Token,
+			URL:         sar.remoteAction.CloneURL(),
+			Ref:         sar.remoteAction.Ref,
+			Dir:         actionDir,
+			Token:       github.Token,
+			OfflineMode: sar.RunContext.Config.ActionOfflineMode,
 		})
 		var ntErr common.Executor
 		if err := gitClone(ctx); err != nil {