Merge pull request #25 from open-edge-platform/srmungar_manifest_code

Manifest file creation function

Author: magerstam

internal/manifest/manifest.go

@@ -0,0 +1,50 @@
+// internal/manifest/manifest.go
+package manifest
+
+import (
+	"encoding/json"
+	"fmt"
+	"os"
+
+	utils "github.com/open-edge-platform/image-composer/internal/utils/logger"
+)
+
+// SoftwarePackageManifest represents the structure of the manifest file.
+type SoftwarePackageManifest struct {
+	SchemaVersion     string `json:"schema_version"`
+	ImageVersion      string `json:"image_version"`
+	BuiltAt           string `json:"built_at"`
+	Arch              string `json:"arch"`
+	SizeBytes         int64  `json:"size_bytes"`
+	Hash              string `json:"hash"`
+	HashAlg           string `json:"hash_alg"`
+	Signature         string `json:"signature"`
+	SigAlg            string `json:"sig_alg"`
+	MinCurrentVersion string `json:"min_current_version"`
+}
+
+// WriteManifestToFile writes the manifest to the specified output file.
+func WriteManifestToFile(manifest SoftwarePackageManifest, outputFile string) error {
+	logger := utils.Logger()
+	logger.Infof("Writing the Image Manifest to the file: %s", outputFile)
+	// Marshal the manifest struct to JSON
+	manifestJSON, err := json.MarshalIndent(manifest, "", "  ")
+	if err != nil {
+		return fmt.Errorf("error marshaling manifest to JSON: %w", err)
+	}
+
+	// Create or open the output file
+	file, err := os.Create(outputFile)
+	if err != nil {
+		return fmt.Errorf("error creating/opening file: %w", err)
+	}
+	defer file.Close()
+
+	// Write the JSON data to the file
+	_, err = file.Write(manifestJSON)
+	if err != nil {
+		return fmt.Errorf("error writing to file: %w", err)
+	}
+
+	return nil
+}