Use time.Time not string for LastModified

Signed-off-by: Anders F Björklund <anders.f.bjorklund@gmail.com>

Author: afbjorklund

pkg/downloader/downloader.go

@@ -13,6 +13,7 @@ import (
 	"path"
 	"path/filepath"
 	"strings"
+	"time"
 
 	"github.com/cheggaaa/pb/v3"
 	"github.com/containerd/continuity/fs"
@@ -44,7 +45,7 @@ const (
 type Result struct {
 	Status          Status
 	CachePath       string // "/Users/foo/Library/Caches/lima/download/by-url-sha256/<SHA256_OF_URL>/data"
-	LastModified    string
+	LastModified    time.Time
 	ContentType     string
 	ValidatedDigest bool
 }
@@ -134,6 +135,24 @@ func readFile(path string) string {
 	return string(b)
 }
 
+func readTime(path string) time.Time {
+	if path == "" {
+		return time.Time{}
+	}
+	if _, err := os.Stat(path); err != nil {
+		return time.Time{}
+	}
+	b, err := os.ReadFile(path)
+	if err != nil {
+		return time.Time{}
+	}
+	t, err := time.Parse(http.TimeFormat, string(b))
+	if err != nil {
+		return time.Time{}
+	}
+	return t
+}
+
 // Download downloads the remote resource into the local path.
 //
 // Download caches the remote resource if WithCache or WithCacheDir option is specified.
@@ -228,7 +247,7 @@ func Download(ctx context.Context, local, remote string, opts ...Opt) (*Result,
 		res := &Result{
 			Status:          StatusUsedCache,
 			CachePath:       shadData,
-			LastModified:    readFile(shadTime),
+			LastModified:    readTime(shadTime),
 			ContentType:     readFile(shadType),
 			ValidatedDigest: o.expectedDigest != "",
 		}
@@ -259,7 +278,7 @@ func Download(ctx context.Context, local, remote string, opts ...Opt) (*Result,
 	res := &Result{
 		Status:          StatusDownloaded,
 		CachePath:       shadData,
-		LastModified:    readFile(shadTime),
+		LastModified:    readTime(shadTime),
 		ContentType:     readFile(shadType),
 		ValidatedDigest: o.expectedDigest != "",
 	}
@@ -309,7 +328,7 @@ func Cached(remote string, opts ...Opt) (*Result, error) {
 	res := &Result{
 		Status:          StatusUsedCache,
 		CachePath:       shadData,
-		LastModified:    readFile(shadTime),
+		LastModified:    readTime(shadTime),
 		ContentType:     readFile(shadType),
 		ValidatedDigest: o.expectedDigest != "",
 	}

pkg/downloader/downloader_test.go

@@ -116,7 +116,7 @@ func TestDownloadRemote(t *testing.T) {
 		r, err := Download(context.Background(), "", dummyRemoteFileURL, WithExpectedDigest(dummyRemoteFileDigest), WithCacheDir(cacheDir))
 		assert.NilError(t, err)
 		assert.Equal(t, StatusDownloaded, r.Status)
-		assert.Equal(t, dummyRemoteFileStat.ModTime().UTC().Format(time.RFC1123), strings.Replace(r.LastModified, "GMT", "UTC", 1))
+		assert.Equal(t, dummyRemoteFileStat.ModTime().Truncate(time.Second).UTC(), r.LastModified)
 		assert.Equal(t, "text/plain; charset=utf-8", r.ContentType)
 	})
 }