Fixes containers#14698 Use prepared image for WSL machine init

Signed-off-by: Gerard Braad <me@gbraad.nl>

pkg/machine/fedorawsl.go

@@ -0,0 +1,65 @@
+//go:build amd64 || arm64
+// +build amd64 arm64
+
+package machine
+
+import (
+	"fmt"
+	"net/http"
+	"net/url"
+	"path/filepath"
+
+	"github.com/pkg/errors"
+)
+
+const (
+	githubLatestReleaseURL = "https://github.com/gbraad/podman-wsl-fedora/releases/latest/download/rootfs.tar.xz"
+)
+
+func NewFedoraWSLDownloader(vmType, vmName, releaseStream string) (DistributionDownload, error) {
+	// TODO:
+	imageName, downloadURL, size, err := getFedoraWSLDownload(githubLatestReleaseURL)
+	if err != nil {
+		return nil, err
+	}
+
+	dataDir, err := GetDataDir(vmType)
+	if err != nil {
+		return nil, err
+	}
+
+	f := FedoraDownload{
+		Download: Download{
+			Arch:      getFcosArch(),
+			Artifact:  artifact,
+			Format:    Format,
+			ImageName: imageName,
+			LocalPath: filepath.Join(dataDir, imageName),
+			URL:       downloadURL,
+			VMName:    vmName,
+			Size:      size,
+		},
+	}
+	f.Download.LocalUncompressedFile = f.getLocalUncompressedName()
+	return f, nil
+}
+
+func getFedoraWSLDownload(releaseURL string) (string, *url.URL, int64, error) {
+	resp, err := http.Head(releaseURL)
+
+	downloadURL, err := url.Parse(releaseURL)
+	if err != nil {
+		return "", nil, -1, errors.Wrapf(err, "invalid URL generated from discovered Fedora file: %s", releaseURL)
+	}
+
+	if err != nil {
+		return "", nil, -1, errors.Wrapf(err, "head request failed: %s", releaseURL)
+	}
+	_ = resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		return "", nil, -1, fmt.Errorf("head request failed [%d] on download: %s", resp.StatusCode, releaseURL)
+	}
+
+	return "podman-wsl-f35.tar.gz", downloadURL, resp.ContentLength, nil
+}

pkg/machine/wsl/machine.go

@@ -347,7 +347,7 @@ func downloadDistro(v *MachineVM, opts machine.InitOptions) error {
 
 	if _, e := strconv.Atoi(opts.ImagePath); e == nil {
 		v.ImageStream = opts.ImagePath
-		dd, err = machine.NewFedoraDownloader(vmtype, v.Name, v.ImageStream)
+		dd, err = machine.NewFedoraWSLDownloader(vmtype, v.Name, v.ImageStream)
 	} else {
 		v.ImageStream = "custom"
 		dd, err = machine.NewGenericDownloader(vmtype, v.Name, opts.ImagePath)
@@ -415,29 +415,9 @@ func provisionWSLDist(v *MachineVM) (string, error) {
 		return "", errors.Wrap(err, "WSL import of guest OS failed")
 	}
 
-	fmt.Println("Installing packages (this will take awhile)...")
-	if err = runCmdPassThrough("wsl", "-d", dist, "dnf", "upgrade", "-y"); err != nil {
-		return "", errors.Wrap(err, "package upgrade on guest OS failed")
-	}
-
-	fmt.Println("Enabling Copr")
-	if err = runCmdPassThrough("wsl", "-d", dist, "dnf", "install", "-y", "'dnf-command(copr)'"); err != nil {
-		return "", errors.Wrap(err, "enabling copr failed")
-	}
-
-	fmt.Println("Enabling podman4 repo")
-	if err = runCmdPassThrough("wsl", "-d", dist, "dnf", "-y", "copr", "enable", "rhcontainerbot/podman4"); err != nil {
-		return "", errors.Wrap(err, "enabling copr failed")
-	}
-
-	if err = runCmdPassThrough("wsl", "-d", dist, "dnf", "install",
-		"podman", "podman-docker", "openssh-server", "procps-ng", "-y"); err != nil {
-		return "", errors.Wrap(err, "package installation on guest OS failed")
-	}
-
 	// Fixes newuidmap
-	if err = runCmdPassThrough("wsl", "-d", dist, "dnf", "reinstall", "shadow-utils", "-y"); err != nil {
-		return "", errors.Wrap(err, "package reinstallation of shadow-utils on guest OS failed")
+	if err = runCmdPassThrough("wsl", "-d", dist, "rpm", "-q", "--restore", "shadow-utils", "2>/dev/null"); err != nil {
+		return "", errors.Wrap(err, "package permissions restore of shadow-utils on guest OS failed")
 	}
 
 	// Windows 11 (NT Version = 10, Build 22000) generates harmless but scary messages on every