Move NerdctlArchiveCache function to cacheutil

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

pkg/cacheutil/cacheutil.go

@@ -0,0 +1,45 @@
+package cacheutil
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/lima-vm/lima/pkg/downloader"
+	"github.com/lima-vm/lima/pkg/fileutils"
+	"github.com/lima-vm/lima/pkg/limayaml"
+)
+
+// EnsureNerdctlArchiveCache prefetches the nerdctl-full-VERSION-GOOS-GOARCH.tar.gz archive
+// into the cache before launching the hostagent process, so that we can show the progress in tty.
+// https://github.com/lima-vm/lima/issues/326
+func EnsureNerdctlArchiveCache(ctx context.Context, y *limayaml.LimaYAML, created bool) (string, error) {
+	if !*y.Containerd.System && !*y.Containerd.User {
+		// nerdctl archive is not needed
+		return "", nil
+	}
+
+	errs := make([]error, len(y.Containerd.Archives))
+	for i, f := range y.Containerd.Archives {
+		// Skip downloading again if the file is already in the cache
+		if created && f.Arch == *y.Arch && !downloader.IsLocal(f.Location) {
+			path, err := fileutils.CachedFile(f)
+			if err == nil {
+				return path, nil
+			}
+		}
+		path, err := fileutils.DownloadFile(ctx, "", f, false, "the nerdctl archive", *y.Arch)
+		if err != nil {
+			errs[i] = err
+			continue
+		}
+		if path == "" {
+			if downloader.IsLocal(f.Location) {
+				return f.Location, nil
+			}
+			return "", fmt.Errorf("cache did not contain %q", f.Location)
+		}
+		return path, nil
+	}
+
+	return "", fileutils.Errors(errs)
+}

pkg/start/start.go

@@ -15,15 +15,14 @@ import (
 	"time"
 
 	"github.com/coreos/go-semver/semver"
+	"github.com/lima-vm/lima/pkg/cacheutil"
 	"github.com/lima-vm/lima/pkg/driver"
 	"github.com/lima-vm/lima/pkg/driverutil"
 	"github.com/lima-vm/lima/pkg/osutil"
 	"github.com/lima-vm/lima/pkg/qemu"
 	"github.com/lima-vm/lima/pkg/qemu/entitlementutil"
 	"github.com/mattn/go-isatty"
 
-	"github.com/lima-vm/lima/pkg/downloader"
-	"github.com/lima-vm/lima/pkg/fileutils"
 	hostagentevents "github.com/lima-vm/lima/pkg/hostagent/events"
 	"github.com/lima-vm/lima/pkg/limayaml"
 	"github.com/lima-vm/lima/pkg/store"
@@ -35,41 +34,6 @@ import (
 // to be running before timing out.
 const DefaultWatchHostAgentEventsTimeout = 10 * time.Minute
 
-// ensureNerdctlArchiveCache prefetches the nerdctl-full-VERSION-GOOS-GOARCH.tar.gz archive
-// into the cache before launching the hostagent process, so that we can show the progress in tty.
-// https://github.com/lima-vm/lima/issues/326
-func ensureNerdctlArchiveCache(ctx context.Context, y *limayaml.LimaYAML, created bool) (string, error) {
-	if !*y.Containerd.System && !*y.Containerd.User {
-		// nerdctl archive is not needed
-		return "", nil
-	}
-
-	errs := make([]error, len(y.Containerd.Archives))
-	for i, f := range y.Containerd.Archives {
-		// Skip downloading again if the file is already in the cache
-		if created && f.Arch == *y.Arch && !downloader.IsLocal(f.Location) {
-			path, err := fileutils.CachedFile(f)
-			if err == nil {
-				return path, nil
-			}
-		}
-		path, err := fileutils.DownloadFile(ctx, "", f, false, "the nerdctl archive", *y.Arch)
-		if err != nil {
-			errs[i] = err
-			continue
-		}
-		if path == "" {
-			if downloader.IsLocal(f.Location) {
-				return f.Location, nil
-			}
-			return "", fmt.Errorf("cache did not contain %q", f.Location)
-		}
-		return path, nil
-	}
-
-	return "", fileutils.Errors(errs)
-}
-
 type Prepared struct {
 	Driver              driver.Driver
 	NerdctlArchiveCache string
@@ -104,7 +68,7 @@ func Prepare(ctx context.Context, inst *store.Instance) (*Prepared, error) {
 	if err := limaDriver.CreateDisk(ctx); err != nil {
 		return nil, err
 	}
-	nerdctlArchiveCache, err := ensureNerdctlArchiveCache(ctx, y, created)
+	nerdctlArchiveCache, err := cacheutil.EnsureNerdctlArchiveCache(ctx, y, created)
 	if err != nil {
 		return nil, err
 	}