Fixes #14698 Use prepared image for WSL2 machine init

This commit introduces a prepared image for setting up the WSL2
environment. This means that the deployment will take considerable
less time to finish (as it does not need to run an update and package
install), but also allows to rely on a cached image to re-init the
environment without the need for an internet connection.

[NO NEW TESTS NEEDED]

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

2 files changed, 17 insertions, 76 deletions

diff --git a/pkg/machine/fedora.go b/pkg/machine/fedora.go
index 46e450418..2c6d3d810 100644
--- a/pkg/machine/fedora.go
+++ b/pkg/machine/fedora.go
@@ -6,29 +6,23 @@ package machine
 import (
 	"errors"
 	"fmt"
-	"io"
-	"io/ioutil"
+	"os"
+
 	"net/http"
 	"net/url"
-	"os"
 	"path/filepath"
-	"regexp"
-
-	"github.com/sirupsen/logrus"
 )
 
 const (
-	githubURL = "http://github.com/fedora-cloud/docker-brew-fedora/"
+	githubLatestReleaseURL = "https://github.com/containers/podman-wsl-fedora/releases/latest/download/rootfs.tar.xz"
 )
 
-var fedoraxzRegex = regexp.MustCompile(`fedora[^\"]+xz`)
-
 type FedoraDownload struct {
 	Download
 }
 
 func NewFedoraDownloader(vmType, vmName, releaseStream string) (DistributionDownload, error) {
-	imageName, downloadURL, size, err := getFedoraDownload(releaseStream)
+	downloadURL, size, err := getFedoraDownload(githubLatestReleaseURL)
 	if err != nil {
 		return nil, err
 	}
@@ -38,6 +32,8 @@ func NewFedoraDownloader(vmType, vmName, releaseStream string) (DistributionDown
 		return nil, err
 	}
 
+	imageName := "rootfs.tar.xz"
+
 	f := FedoraDownload{
 		Download: Download{
 			Arch:      getFcosArch(),
@@ -69,56 +65,21 @@ func (f FedoraDownload) HasUsableCache() (bool, error) {
 	return info.Size() == f.Size, nil
 }
 
-func truncRead(url string) ([]byte, error) {
-	resp, err := http.Get(url)
-	if err != nil {
-		return nil, err
-	}
-
-	defer func() {
-		if err := resp.Body.Close(); err != nil {
-			logrus.Error(err)
-		}
-	}()
-
-	body, err := ioutil.ReadAll(io.LimitReader(resp.Body, 10*1024*1024))
-	if err != nil {
-		return nil, err
-	}
-
-	_, _ = io.Copy(io.Discard, resp.Body)
-
-	return body, nil
-}
-
-func getFedoraDownload(releaseStream string) (string, *url.URL, int64, error) {
-	dirURL := githubURL + "tree/" + releaseStream + "/" + getFcosArch() + "/"
-	body, err := truncRead(dirURL)
-	if err != nil {
-		return "", nil, -1, err
-	}
-
-	file := fedoraxzRegex.FindString(string(body))
-	if len(file) == 0 {
-		return "", nil, -1, fmt.Errorf("could not locate Fedora download at %s", dirURL)
-	}
-
-	rawURL := githubURL + "raw/" + releaseStream + "/" + getFcosArch() + "/"
-	newLocation := rawURL + file
-	downloadURL, err := url.Parse(newLocation)
+func getFedoraDownload(releaseURL string) (*url.URL, int64, error) {
+	downloadURL, err := url.Parse(releaseURL)
 	if err != nil {
-		return "", nil, -1, fmt.Errorf("invalid URL generated from discovered Fedora file: %s: %w", newLocation, err)
+		return nil, -1, fmt.Errorf("invalid URL generated from discovered Fedora file: %s: %w", releaseURL, err)
 	}
 
-	resp, err := http.Head(newLocation)
+	resp, err := http.Head(releaseURL)
 	if err != nil {
-		return "", nil, -1, fmt.Errorf("head request failed: %s: %w", newLocation, err)
+		return nil, -1, fmt.Errorf("head request failed: %s: %w", releaseURL, err)
 	}
 	_ = resp.Body.Close()
 
 	if resp.StatusCode != http.StatusOK {
-		return "", nil, -1, fmt.Errorf("head request failed [%d] on download: %s", resp.StatusCode, newLocation)
+		return nil, -1, fmt.Errorf("head request failed: %s: %w", releaseURL, err)
 	}
 
-	return file, downloadURL, resp.ContentLength, nil
+	return downloadURL, resp.ContentLength, nil
 }
diff --git a/pkg/machine/wsl/machine.go b/pkg/machine/wsl/machine.go
index 450d8b877..189723ac7 100644
--- a/pkg/machine/wsl/machine.go
+++ b/pkg/machine/wsl/machine.go
@@ -386,7 +386,7 @@ 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.NewFedoraDownloader(vmtype, v.Name, opts.ImagePath)
 	} else {
 		v.ImageStream = "custom"
 		dd, err = machine.NewGenericDownloader(vmtype, v.Name, opts.ImagePath)
@@ -449,34 +449,14 @@ func provisionWSLDist(v *MachineVM) (string, error) {
 	}
 
 	dist := toDist(v.Name)
-	fmt.Println("Importing operating system into WSL (this may take 5+ minutes on a new WSL install)...")
+	fmt.Println("Importing operating system into WSL (this may take a few minutes on a new WSL install)...")
 	if err = runCmdPassThrough("wsl", "--import", dist, distTarget, v.ImagePath); err != nil {
 		return "", fmt.Errorf("the WSL import of guest OS failed: %w", err)
 	}
 
-	fmt.Println("Installing packages (this will take awhile)...")
-	if err = runCmdPassThrough("wsl", "-d", dist, "dnf", "upgrade", "-y"); err != nil {
-		return "", fmt.Errorf("package upgrade on guest OS failed: %w", err)
-	}
-
-	fmt.Println("Enabling Copr")
-	if err = runCmdPassThrough("wsl", "-d", dist, "dnf", "install", "-y", "'dnf-command(copr)'"); err != nil {
-		return "", fmt.Errorf("enabling copr failed: %w", err)
-	}
-
-	fmt.Println("Enabling podman4 repo")
-	if err = runCmdPassThrough("wsl", "-d", dist, "dnf", "-y", "copr", "enable", "rhcontainerbot/podman4"); err != nil {
-		return "", fmt.Errorf("enabling copr failed: %w", err)
-	}
-
-	if err = runCmdPassThrough("wsl", "-d", dist, "dnf", "install",
-		"podman", "podman-docker", "openssh-server", "procps-ng", "-y"); err != nil {
-		return "", fmt.Errorf("package installation on guest OS failed: %w", err)
-	}
-
 	// Fixes newuidmap
-	if err = runCmdPassThrough("wsl", "-d", dist, "dnf", "reinstall", "shadow-utils", "-y"); err != nil {
-		return "", fmt.Errorf("package reinstallation of shadow-utils on guest OS failed: %w", err)
+	if err = runCmdPassThrough("wsl", "-d", dist, "rpm", "-q", "--restore", "shadow-utils", "2>/dev/null"); err != nil {
+		return "", fmt.Errorf("package permissions restore of shadow-utils on guest OS failed: %w", err)
 	}
 
 	// Windows 11 (NT Version = 10, Build 22000) generates harmless but scary messages on every