From 42dfc12243e61f6e7bc773ad621ed60a5a50f3c5 Mon Sep 17 00:00:00 2001
From: Marc Cataford <mcat@riseup.net>
Date: Mon, 2 Sep 2024 11:13:59 -0400
Subject: [PATCH] feat: basic no-input node action support

---
 internal/actions/definition.go | 37 ++++++++++++++++++++++++++++++++++
 internal/actions/manager.go    | 37 +++++++++++++++++++++++++++++++---
 internal/runner/runner.go      |  9 ++++++++-
 3 files changed, 79 insertions(+), 4 deletions(-)
 create mode 100644 internal/actions/definition.go

diff --git a/internal/actions/definition.go b/internal/actions/definition.go
new file mode 100644
index 0000000..207b1f6
--- /dev/null
+++ b/internal/actions/definition.go
@@ -0,0 +1,37 @@
+package actions
+
+import (
+	"gopkg.in/yaml.v3"
+	"io/ioutil"
+)
+
+type ActionInput struct {
+	Description string `yaml:"description"`
+	Default     string `yaml:"default"`
+}
+
+type ActionDefinition struct {
+	Name        string                 `yaml:"name"`
+	Description string                 `yaml:"description"`
+	Inputs      map[string]ActionInput `yaml:"inputs"`
+	Runs        struct {
+		Using string `yaml:"using"`
+		Main  string `yaml:"main"`
+	} `yaml:"runs"`
+}
+
+func GetDefinitionFromFile(defPath string) (*ActionDefinition, error) {
+	defRaw, err := ioutil.ReadFile(defPath)
+
+	if err != nil {
+		return nil, err
+	}
+
+	var def ActionDefinition
+
+	if yamlError := yaml.Unmarshal(defRaw, &def); yamlError != nil {
+		return nil, yamlError
+	}
+
+	return &def, nil
+}
diff --git a/internal/actions/manager.go b/internal/actions/manager.go
index 24cf2d6..76be023 100644
--- a/internal/actions/manager.go
+++ b/internal/actions/manager.go
@@ -1,16 +1,23 @@
 package actions
 
 import (
+	driver "courgette/internal/driver"
 	logger "courgette/internal/logging"
+	"errors"
+	"fmt"
+	"path/filepath"
 )
 
 type ActionsManager struct {
 	git CliClient
+	// Action cache location.
+	cacheRoot string
 }
 
-func NewActionsManager() ActionsManager {
+func NewActionsManager(cacheRoot string) ActionsManager {
 	return ActionsManager{
-		git: GitClient{},
+		git:       GitClient{},
+		cacheRoot: cacheRoot,
 	}
 }
 
@@ -18,8 +25,32 @@ func NewActionsManager() ActionsManager {
 //
 // <actionName> is expected to be the full url of the repository where
 // the action lives.
-func (a ActionsManager) PrefetchAction(actionName string, destination string) error {
+func (a ActionsManager) PrefetchAction(actionName string) error {
+	destination := filepath.Join(a.cacheRoot, GetActionKey(actionName))
 	logger.Info("Prefetching action: %s to %s", actionName, destination)
 
 	return a.git.Clone(actionName, destination)
 }
+
+func (a ActionsManager) UseAction(actionName string, containerId string, options driver.CommandOptions) error {
+	actionKey := GetActionKey(actionName)
+	hostActionRoot := filepath.Join(a.cacheRoot, actionKey)
+	actionDefPath := filepath.Join(hostActionRoot, "action.yml")
+	actionDef, _ := GetDefinitionFromFile(actionDefPath)
+
+	containerActionRoot := filepath.Join("/cache", actionKey)
+	actionMain := filepath.Join(containerActionRoot, actionDef.Runs.Main)
+	command := fmt.Sprintf("node %s", actionMain)
+
+	result := driver.PodmanDriver{}.Exec(containerId, command, options)
+
+	if result.Error != nil {
+		return result.Error
+	}
+
+	if result.ExitCode != 0 {
+		return errors.New("Action used returned non-zero exit code.")
+	}
+
+	return nil
+}
diff --git a/internal/runner/runner.go b/internal/runner/runner.go
index f4f7f23..f7fe660 100644
--- a/internal/runner/runner.go
+++ b/internal/runner/runner.go
@@ -49,7 +49,7 @@ func (r *Runner) RunWorkflow(workflow workflows.Workflow) TaskTracker {
 		switch n.(type) {
 		case workflows.Step:
 			if useAction := n.(workflows.Step).Use; useAction != "" {
-				actions.NewActionsManager().PrefetchAction(useAction, r.Cache.Path(actions.GetActionKey(useAction)))
+				actions.NewActionsManager(r.Cache.Root).PrefetchAction(useAction)
 			}
 		}
 	})
@@ -164,6 +164,13 @@ func (r *Runner) RunJobInContainer(imageUri string, containerId string, jobConte
 				Shell: stepShell,
 			}
 			stepError = r.RunCommandInContainer(containerId, step.Run, commandOptions)
+		} else if step.Use != "" {
+			commandOptions := driver.CommandOptions{
+				Cwd:   stepCwd,
+				Env:   stepEnv,
+				Shell: stepShell,
+			}
+			stepError = actions.NewActionsManager(r.Cache.Root).UseAction(step.Use, containerId, commandOptions)
 		}
 
 		if stepError != nil && !step.ContinueOnError {