Initial commit with support for GitHub actions

actions/parser.go

@@ -0,0 +1,76 @@
+package actions
+
+import (
+	"bytes"
+	"io/ioutil"
+	"os"
+	"path/filepath"
+
+	"github.com/hashicorp/hcl"
+	"github.com/hashicorp/hcl/hcl/ast"
+	log "github.com/sirupsen/logrus"
+)
+
+// ParseWorkflows will read in the set of actions from the workflow file
+func ParseWorkflows(workingDir string, workflowPath string) (Workflows, error) {
+	workingDir, err := filepath.Abs(workingDir)
+	if err != nil {
+		return nil, err
+	}
+	log.Debugf("Setting working dir to %s", workingDir)
+
+	if !filepath.IsAbs(workflowPath) {
+		workflowPath = filepath.Join(workingDir, workflowPath)
+	}
+	log.Debugf("Loading workflow config from %s", workflowPath)
+	workflowReader, err := os.Open(workflowPath)
+	if err != nil {
+		return nil, err
+	}
+
+	buf := new(bytes.Buffer)
+	buf.ReadFrom(workflowReader)
+
+	workflows := new(workflowsFile)
+	workflows.WorkingDir = workingDir
+	workflows.WorkflowPath = workflowPath
+
+	astFile, err := hcl.ParseBytes(buf.Bytes())
+	if err != nil {
+		return nil, err
+	}
+	rootNode := ast.Walk(astFile.Node, cleanWorkflowsAST)
+	err = hcl.DecodeObject(workflows, rootNode)
+	if err != nil {
+		return nil, err
+	}
+
+	workflows.TempDir, err = ioutil.TempDir("/tmp", "act-")
+	if err != nil {
+		return nil, err
+	}
+
+	// TODO: add validation logic
+	// - check for circular dependencies
+	// - check for valid local path refs
+	// - check for valid dependencies
+
+	return workflows, nil
+}
+
+func cleanWorkflowsAST(node ast.Node) (ast.Node, bool) {
+	if objectItem, ok := node.(*ast.ObjectItem); ok {
+		key := objectItem.Keys[0].Token.Value()
+
+		// handle condition where value is a string but should be a list
+		switch key {
+		case "resolves", "needs", "args":
+			if literalType, ok := objectItem.Val.(*ast.LiteralType); ok {
+				listType := new(ast.ListType)
+				listType.Add(literalType)
+				objectItem.Val = listType
+			}
+		}
+	}
+	return node, true
+}