feature: add LocalPath to support use local resource to skip download

pkg/fileutils/download.go

@@ -5,9 +5,13 @@ package fileutils
 
 import (
 	"context"
+	"crypto/sha256"
 	"errors"
 	"fmt"
+	"io"
+	"os"
 	"path"
+	"path/filepath"
 
 	"github.com/sirupsen/logrus"
 
@@ -18,12 +22,65 @@ import (
 // ErrSkipped is returned when the downloader did not attempt to download the specified file.
 var ErrSkipped = errors.New("skipped to download")
 
+func CopyFile(src, dst string) error {
+	source, err := os.Open(src)
+	if err != nil {
+		return err
+	}
+	defer source.Close()
+	if err := os.MkdirAll(filepath.Dir(dst), 0o660); err != nil {
+		return err
+	}
+	destination, err := os.Create(dst)
+	if err != nil {
+		return err
+	}
+	defer destination.Close()
+	_, err = io.Copy(destination, source)
+	return err
+}
+
+func GetFileSHA256(filePath string) (string, error) {
+	file, err := os.Open(filePath)
+	if err != nil {
+		return "", err
+	}
+	defer file.Close()
+	hash := sha256.New()
+	if _, err := io.Copy(hash, file); err != nil {
+		return "", err
+	}
+	return fmt.Sprintf("sha256:%x", hash.Sum(nil)), nil
+}
+
 // DownloadFile downloads a file to the cache, optionally copying it to the destination. Returns path in cache.
-func DownloadFile(ctx context.Context, dest string, f limayaml.File, decompress bool, description string, expectedArch limayaml.Arch) (string, error) {
+func DownloadFile(ctx context.Context, dest string, f limayaml.File, decompress bool, description string, expectedArch limayaml.Arch) (_ string, reterr error) {
 	if f.Arch != expectedArch {
 		return "", fmt.Errorf("%w: %q: unsupported arch: %q", ErrSkipped, f.Location, f.Arch)
 	}
-	fields := logrus.Fields{"location": f.Location, "arch": f.Arch, "digest": f.Digest}
+	fields := logrus.Fields{"location": f.Location, "arch": f.Arch, "digest": f.Digest, "LocalPath": f.LocalPath}
+	if f.LocalPath != "" {
+		if _, err := os.Stat(f.LocalPath); err != nil {
+			return "", err
+		}
+		logrus.WithFields(fields).Infof("Attempting to copy local file %s", description)
+		if reterr != nil {
+			defer os.Remove(dest)
+		}
+		if err := CopyFile(f.LocalPath, dest); err != nil {
+			return "", fmt.Errorf("failed to copy file: %w", err)
+		}
+		sha256Sum, err := GetFileSHA256(dest)
+		if err != nil {
+			return "", fmt.Errorf("failed to getsha256: %w", err)
+		}
+
+		if sha256Sum != f.Digest.String() {
+			return "", fmt.Errorf("wrong sha256 for %s", dest)
+		}
+		return f.LocalPath, nil
+	}
+
 	logrus.WithFields(fields).Infof("Attempting to download %s", description)
 	res, err := downloader.Download(ctx, dest, f.Location,
 		downloader.WithCache(),

pkg/limayaml/limayaml.go

@@ -121,9 +121,10 @@ type Rosetta struct {
 }
 
 type File struct {
-	Location string        `yaml:"location" json:"location"` // REQUIRED
-	Arch     Arch          `yaml:"arch,omitempty" json:"arch,omitempty"`
-	Digest   digest.Digest `yaml:"digest,omitempty" json:"digest,omitempty"`
+	Location  string        `yaml:"location" json:"location"` // REQUIRED
+	Arch      Arch          `yaml:"arch,omitempty" json:"arch,omitempty"`
+	Digest    digest.Digest `yaml:"digest,omitempty" json:"digest,omitempty"`
+	LocalPath string        `yaml:"localPath,omitempty" json:"localPath,omitempty"`
 }
 
 type FileWithVMType struct {