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envbuilder.go
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package envbuilder
import (
"bufio"
"bytes"
"context"
"crypto/x509"
"encoding/base64"
"encoding/json"
"errors"
"fmt"
"io"
"io/fs"
"maps"
"net"
"net/http"
"os"
"os/exec"
"os/user"
"path/filepath"
"sort"
"strconv"
"strings"
"sync"
"syscall"
"time"
"github.com/coder/envbuilder/constants"
"github.com/coder/envbuilder/git"
"github.com/coder/envbuilder/options"
"github.com/go-git/go-billy/v5"
"github.com/GoogleContainerTools/kaniko/pkg/config"
"github.com/GoogleContainerTools/kaniko/pkg/creds"
"github.com/GoogleContainerTools/kaniko/pkg/executor"
"github.com/GoogleContainerTools/kaniko/pkg/util"
"github.com/coder/envbuilder/devcontainer"
"github.com/coder/envbuilder/internal/ebutil"
"github.com/coder/envbuilder/log"
"github.com/containerd/containerd/platforms"
"github.com/distribution/distribution/v3/configuration"
"github.com/distribution/distribution/v3/registry/handlers"
_ "github.com/distribution/distribution/v3/registry/storage/driver/filesystem"
"github.com/docker/cli/cli/config/configfile"
"github.com/fatih/color"
"github.com/go-git/go-git/v5/plumbing/transport"
v1 "github.com/google/go-containerregistry/pkg/v1"
"github.com/google/go-containerregistry/pkg/v1/remote"
"github.com/kballard/go-shellquote"
"github.com/mattn/go-isatty"
"github.com/sirupsen/logrus"
"github.com/tailscale/hujson"
"golang.org/x/xerrors"
)
// DockerConfig represents the Docker configuration file.
type DockerConfig configfile.ConfigFile
// Run runs the envbuilder.
// Logger is the logf to use for all operations.
// Filesystem is the filesystem to use for all operations.
// Defaults to the host filesystem.
func Run(ctx context.Context, opts options.Options) error {
defer options.UnsetEnv()
if opts.GetCachedImage {
return fmt.Errorf("developer error: use RunCacheProbe instead")
}
if opts.CacheRepo == "" && opts.PushImage {
return fmt.Errorf("--cache-repo must be set when using --push-image")
}
// Default to the shell!
initArgs := []string{"-c", opts.InitScript}
if opts.InitArgs != "" {
var err error
initArgs, err = shellquote.Split(opts.InitArgs)
if err != nil {
return fmt.Errorf("parse init args: %w", err)
}
}
stageNumber := 0
startStage := func(format string, args ...any) func(format string, args ...any) {
now := time.Now()
stageNumber++
stageNum := stageNumber
opts.Logger(log.LevelInfo, "#%d: %s", stageNum, fmt.Sprintf(format, args...))
return func(format string, args ...any) {
opts.Logger(log.LevelInfo, "#%d: %s [%s]", stageNum, fmt.Sprintf(format, args...), time.Since(now))
}
}
opts.Logger(log.LevelInfo, "%s - Build development environments from repositories in a container", newColor(color.Bold).Sprintf("envbuilder"))
var caBundle []byte
caBundle, err := initCABundle(opts.SSLCertBase64)
if err != nil {
return err
}
cleanupDockerConfigJSON, err := initDockerConfigJSON(opts.DockerConfigBase64)
if err != nil {
return err
}
defer func() {
if err := cleanupDockerConfigJSON(); err != nil {
opts.Logger(log.LevelError, "failed to cleanup docker config JSON: %w", err)
}
}() // best effort
var fallbackErr error
var cloned bool
if opts.GitURL != "" {
endStage := startStage("📦 Cloning %s to %s...",
newColor(color.FgCyan).Sprintf(opts.GitURL),
newColor(color.FgCyan).Sprintf(opts.WorkspaceFolder),
)
reader, writer := io.Pipe()
defer reader.Close()
defer writer.Close()
go func() {
data := make([]byte, 4096)
for {
read, err := reader.Read(data)
if err != nil {
return
}
content := data[:read]
for _, line := range strings.Split(string(content), "\r") {
if line == "" {
continue
}
opts.Logger(log.LevelInfo, "#1: %s", strings.TrimSpace(line))
}
}
}()
cloneOpts := git.CloneRepoOptions{
Path: opts.WorkspaceFolder,
Storage: opts.Filesystem,
Insecure: opts.Insecure,
Progress: writer,
SingleBranch: opts.GitCloneSingleBranch,
Depth: int(opts.GitCloneDepth),
CABundle: caBundle,
}
cloneOpts.RepoAuth = git.SetupRepoAuth(&opts)
if opts.GitHTTPProxyURL != "" {
cloneOpts.ProxyOptions = transport.ProxyOptions{
URL: opts.GitHTTPProxyURL,
}
}
cloneOpts.RepoURL = opts.GitURL
cloned, fallbackErr = git.CloneRepo(ctx, cloneOpts)
if fallbackErr == nil {
if cloned {
endStage("📦 Cloned repository!")
} else {
endStage("📦 The repository already exists!")
}
} else {
opts.Logger(log.LevelError, "Failed to clone repository: %s", fallbackErr.Error())
opts.Logger(log.LevelError, "Falling back to the default image...")
}
}
defaultBuildParams := func() (*devcontainer.Compiled, error) {
dockerfile := filepath.Join(constants.MagicDir, "Dockerfile")
file, err := opts.Filesystem.OpenFile(dockerfile, os.O_CREATE|os.O_WRONLY, 0o644)
if err != nil {
return nil, err
}
defer file.Close()
if opts.FallbackImage == "" {
if fallbackErr != nil {
return nil, xerrors.Errorf("%s: %w", fallbackErr.Error(), constants.ErrNoFallbackImage)
}
// We can't use errors.Join here because our tests
// don't support parsing a multiline error.
return nil, constants.ErrNoFallbackImage
}
content := "FROM " + opts.FallbackImage
_, err = file.Write([]byte(content))
if err != nil {
return nil, err
}
return &devcontainer.Compiled{
DockerfilePath: dockerfile,
DockerfileContent: content,
BuildContext: constants.MagicDir,
}, nil
}
var (
buildParams *devcontainer.Compiled
scripts devcontainer.LifecycleScripts
devcontainerPath string
)
if opts.DockerfilePath == "" {
// Only look for a devcontainer if a Dockerfile wasn't specified.
// devcontainer is a standard, so it's reasonable to be the default.
var devcontainerDir string
var err error
devcontainerPath, devcontainerDir, err = findDevcontainerJSON(opts)
if err != nil {
opts.Logger(log.LevelError, "Failed to locate devcontainer.json: %s", err.Error())
opts.Logger(log.LevelError, "Falling back to the default image...")
} else {
// We know a devcontainer exists.
// Let's parse it and use it!
file, err := opts.Filesystem.Open(devcontainerPath)
if err != nil {
return fmt.Errorf("open devcontainer.json: %w", err)
}
defer file.Close()
content, err := io.ReadAll(file)
if err != nil {
return fmt.Errorf("read devcontainer.json: %w", err)
}
devContainer, err := devcontainer.Parse(content)
if err == nil {
var fallbackDockerfile string
if !devContainer.HasImage() && !devContainer.HasDockerfile() {
defaultParams, err := defaultBuildParams()
if err != nil {
return fmt.Errorf("no Dockerfile or image found: %w", err)
}
opts.Logger(log.LevelInfo, "No Dockerfile or image specified; falling back to the default image...")
fallbackDockerfile = defaultParams.DockerfilePath
}
buildParams, err = devContainer.Compile(opts.Filesystem, devcontainerDir, constants.MagicDir, fallbackDockerfile, opts.WorkspaceFolder, false, os.LookupEnv)
if err != nil {
return fmt.Errorf("compile devcontainer.json: %w", err)
}
scripts = devContainer.LifecycleScripts
} else {
opts.Logger(log.LevelError, "Failed to parse devcontainer.json: %s", err.Error())
opts.Logger(log.LevelError, "Falling back to the default image...")
}
}
} else {
// If a Dockerfile was specified, we use that.
dockerfilePath := filepath.Join(opts.WorkspaceFolder, opts.DockerfilePath)
// If the dockerfilePath is specified and deeper than the base of WorkspaceFolder AND the BuildContextPath is
// not defined, show a warning
dockerfileDir := filepath.Dir(dockerfilePath)
if dockerfileDir != filepath.Clean(opts.WorkspaceFolder) && opts.BuildContextPath == "" {
opts.Logger(log.LevelWarn, "given dockerfile %q is below %q and no custom build context has been defined", dockerfilePath, opts.WorkspaceFolder)
opts.Logger(log.LevelWarn, "\t-> set BUILD_CONTEXT_PATH to %q to fix", dockerfileDir)
}
dockerfile, err := opts.Filesystem.Open(dockerfilePath)
if err == nil {
content, err := io.ReadAll(dockerfile)
if err != nil {
return fmt.Errorf("read Dockerfile: %w", err)
}
buildParams = &devcontainer.Compiled{
DockerfilePath: dockerfilePath,
DockerfileContent: string(content),
BuildContext: filepath.Join(opts.WorkspaceFolder, opts.BuildContextPath),
}
}
}
if buildParams == nil {
// If there isn't a devcontainer.json file in the repository,
// we fallback to whatever the `DefaultImage` is.
var err error
buildParams, err = defaultBuildParams()
if err != nil {
return fmt.Errorf("no Dockerfile or devcontainer.json found: %w", err)
}
}
HijackLogrus(func(entry *logrus.Entry) {
for _, line := range strings.Split(entry.Message, "\r") {
opts.Logger(log.LevelInfo, "#%d: %s", stageNumber, color.HiBlackString(line))
}
})
if opts.LayerCacheDir != "" {
if opts.CacheRepo != "" {
opts.Logger(log.LevelWarn, "Overriding cache repo with local registry...")
}
localRegistry, closeLocalRegistry, err := serveLocalRegistry(ctx, opts.Logger, opts.LayerCacheDir)
if err != nil {
return err
}
defer closeLocalRegistry()
opts.CacheRepo = localRegistry
}
// IgnorePaths in the Kaniko opts doesn't properly ignore paths.
// So we add them to the default ignore list. See:
// https://github.com/GoogleContainerTools/kaniko/blob/63be4990ca5a60bdf06ddc4d10aa4eca0c0bc714/cmd/executor/cmd/root.go#L136
ignorePaths := append([]string{
constants.MagicDir,
opts.WorkspaceFolder,
// See: https://github.com/coder/envbuilder/issues/37
"/etc/resolv.conf",
}, opts.IgnorePaths...)
if opts.LayerCacheDir != "" {
ignorePaths = append(ignorePaths, opts.LayerCacheDir)
}
for _, ignorePath := range ignorePaths {
util.AddToDefaultIgnoreList(util.IgnoreListEntry{
Path: ignorePath,
PrefixMatchOnly: false,
AllowedPaths: nil,
})
}
// In order to allow 'resuming' envbuilder, embed the binary into the image
// if it is being pushed
if opts.PushImage {
// Add exception to the ignore list for the magic image file.
if err := util.AddAllowedPathToDefaultIgnoreList(constants.MagicImage); err != nil {
return xerrors.Errorf("add exe path to ignore list: %w", err)
}
exePath, err := os.Executable()
if err != nil {
return xerrors.Errorf("get exe path: %w", err)
}
// Add an exception for the current running binary in kaniko ignore list
if err := util.AddAllowedPathToDefaultIgnoreList(exePath); err != nil {
return xerrors.Errorf("add exe path to ignore list: %w", err)
}
// Copy the envbuilder binary into the build context.
buildParams.DockerfileContent += fmt.Sprintf(`
COPY --chmod=0644 %[1]s %[1]s
COPY --chmod=0755 %[2]s %[2]s
USER root
WORKDIR /
ENTRYPOINT [%[2]q]`, constants.MagicImage, exePath)
magicDst := filepath.Join(buildParams.BuildContext, constants.MagicImage)
if err := touchFile(opts.Filesystem, magicDst); err != nil {
return xerrors.Errorf("touch file in build context: %w", err)
}
exeDst := filepath.Join(buildParams.BuildContext, exePath)
if err := copyFile(opts.Filesystem, exePath, exeDst); err != nil {
return xerrors.Errorf("copy file to build context: %w", err)
}
}
// temp move of all ro mounts
tempRemountDest := filepath.Join("/", constants.MagicDir, "mnt")
// ignorePrefixes is a superset of ignorePaths that we pass to kaniko's
// IgnoreList.
ignorePrefixes := append([]string{"/dev", "/proc", "/sys"}, ignorePaths...)
restoreMounts, err := ebutil.TempRemount(opts.Logger, tempRemountDest, ignorePrefixes...)
defer func() { // restoreMounts should never be nil
if err := restoreMounts(); err != nil {
opts.Logger(log.LevelError, "restore mounts: %s", err.Error())
}
}()
if err != nil {
return fmt.Errorf("temp remount: %w", err)
}
skippedRebuild := false
stdoutWriter, closeStdout := log.Writer(opts.Logger)
defer closeStdout()
stderrWriter, closeStderr := log.Writer(opts.Logger)
defer closeStderr()
build := func() (v1.Image, error) {
_, alreadyBuiltErr := opts.Filesystem.Stat(constants.MagicFile)
_, isImageErr := opts.Filesystem.Stat(constants.MagicImage)
if (alreadyBuiltErr == nil && opts.SkipRebuild) || isImageErr == nil {
endStage := startStage("🏗️ Skipping build because of cache...")
imageRef, err := devcontainer.ImageFromDockerfile(buildParams.DockerfileContent)
if err != nil {
return nil, fmt.Errorf("image from dockerfile: %w", err)
}
image, err := remote.Image(imageRef, remote.WithAuthFromKeychain(creds.GetKeychain()))
if err != nil {
return nil, fmt.Errorf("image from remote: %w", err)
}
endStage("🏗️ Found image from remote!")
skippedRebuild = true
return image, nil
}
// This is required for deleting the filesystem prior to build!
err = util.InitIgnoreList()
if err != nil {
return nil, fmt.Errorf("init ignore list: %w", err)
}
// It's possible that the container will already have files in it, and
// we don't want to merge a new container with the old one.
if err := maybeDeleteFilesystem(opts.Logger, opts.ForceSafe); err != nil {
return nil, fmt.Errorf("delete filesystem: %w", err)
}
/*
stdoutReader, stdoutWriter := io.Pipe()
stderrReader, stderrWriter := io.Pipe()
defer stdoutReader.Close()
defer stdoutWriter.Close()
defer stderrReader.Close()
defer stderrWriter.Close()
go func() {
scanner := bufio.NewScanner(stdoutReader)
for scanner.Scan() {
opts.Logger(log.LevelInfo, "%s", scanner.Text())
}
}()
go func() {
scanner := bufio.NewScanner(stderrReader)
for scanner.Scan() {
opts.Logger(log.LevelInfo, "%s", scanner.Text())
}
}()
*/
cacheTTL := time.Hour * 24 * 7
if opts.CacheTTLDays != 0 {
cacheTTL = time.Hour * 24 * time.Duration(opts.CacheTTLDays)
}
// At this point we have all the context, we can now build!
registryMirror := []string{}
if val, ok := os.LookupEnv("KANIKO_REGISTRY_MIRROR"); ok {
registryMirror = strings.Split(val, ";")
}
var destinations []string
if opts.CacheRepo != "" {
destinations = append(destinations, opts.CacheRepo)
}
kOpts := &config.KanikoOptions{
// Boilerplate!
CustomPlatform: platforms.Format(platforms.Normalize(platforms.DefaultSpec())),
SnapshotMode: "redo",
RunV2: true,
RunStdout: stdoutWriter,
RunStderr: stderrWriter,
Destinations: destinations,
NoPush: !opts.PushImage || len(destinations) == 0,
CacheRunLayers: true,
CacheCopyLayers: true,
CompressedCaching: true,
Compression: config.ZStd,
// Maps to "default" level, ~100-300 MB/sec according to
// benchmarks in klauspost/compress README
// https://github.com/klauspost/compress/blob/67a538e2b4df11f8ec7139388838a13bce84b5d5/zstd/encoder_options.go#L188
CompressionLevel: 3,
CacheOptions: config.CacheOptions{
CacheTTL: cacheTTL,
CacheDir: opts.BaseImageCacheDir,
},
ForceUnpack: true,
BuildArgs: buildParams.BuildArgs,
CacheRepo: opts.CacheRepo,
Cache: opts.CacheRepo != "" || opts.BaseImageCacheDir != "",
DockerfilePath: buildParams.DockerfilePath,
DockerfileContent: buildParams.DockerfileContent,
RegistryOptions: config.RegistryOptions{
Insecure: opts.Insecure,
InsecurePull: opts.Insecure,
SkipTLSVerify: opts.Insecure,
// Enables registry mirror features in Kaniko, see more in link below
// https://github.com/GoogleContainerTools/kaniko?tab=readme-ov-file#flag---registry-mirror
// Related to PR #114
// https://github.com/coder/envbuilder/pull/114
RegistryMirrors: registryMirror,
},
SrcContext: buildParams.BuildContext,
// For cached image utilization, produce reproducible builds.
Reproducible: opts.PushImage,
}
endStage := startStage("🏗️ Building image...")
image, err := executor.DoBuild(kOpts)
if err != nil {
return nil, xerrors.Errorf("do build: %w", err)
}
endStage("🏗️ Built image!")
if opts.PushImage {
endStage = startStage("🏗️ Pushing image...")
if err := executor.DoPush(image, kOpts); err != nil {
return nil, xerrors.Errorf("do push: %w", err)
}
endStage("🏗️ Pushed image!")
}
return image, err
}
// At this point we have all the context, we can now build!
image, err := build()
if err != nil {
fallback := false
switch {
case strings.Contains(err.Error(), "parsing dockerfile"):
fallback = true
fallbackErr = err
case strings.Contains(err.Error(), "error building stage"):
fallback = true
fallbackErr = err
// This occurs when the image cannot be found!
case strings.Contains(err.Error(), "authentication required"):
fallback = true
fallbackErr = err
// This occurs from Docker Hub when the image cannot be found!
case strings.Contains(err.Error(), "manifest unknown"):
fallback = true
fallbackErr = err
case strings.Contains(err.Error(), "unexpected status code 401 Unauthorized"):
opts.Logger(log.LevelError, "Unable to pull the provided image. Ensure your registry credentials are correct!")
}
if !fallback || opts.ExitOnBuildFailure {
return err
}
opts.Logger(log.LevelError, "Failed to build: %s", err)
opts.Logger(log.LevelError, "Falling back to the default image...")
buildParams, err = defaultBuildParams()
if err != nil {
return err
}
image, err = build()
}
if err != nil {
return fmt.Errorf("build with kaniko: %w", err)
}
if err := restoreMounts(); err != nil {
return fmt.Errorf("restore mounts: %w", err)
}
// Create the magic file to indicate that this build
// has already been ran before!
file, err := opts.Filesystem.Create(constants.MagicFile)
if err != nil {
return fmt.Errorf("create magic file: %w", err)
}
_ = file.Close()
configFile, err := image.ConfigFile()
if err != nil {
return fmt.Errorf("get image config: %w", err)
}
containerEnv := make(map[string]string)
remoteEnv := make(map[string]string)
// devcontainer metadata can be persisted through a standard label
devContainerMetadata, exists := configFile.Config.Labels["devcontainer.metadata"]
if exists {
var devContainer []*devcontainer.Spec
devContainerMetadataBytes, err := hujson.Standardize([]byte(devContainerMetadata))
if err != nil {
return fmt.Errorf("humanize json for dev container metadata: %w", err)
}
err = json.Unmarshal(devContainerMetadataBytes, &devContainer)
if err != nil {
return fmt.Errorf("unmarshal metadata: %w", err)
}
opts.Logger(log.LevelInfo, "#3: 👀 Found devcontainer.json label metadata in image...")
for _, container := range devContainer {
if container.RemoteUser != "" {
opts.Logger(log.LevelInfo, "#3: 🧑 Updating the user to %q!", container.RemoteUser)
configFile.Config.User = container.RemoteUser
}
maps.Copy(containerEnv, container.ContainerEnv)
maps.Copy(remoteEnv, container.RemoteEnv)
if !container.OnCreateCommand.IsEmpty() {
scripts.OnCreateCommand = container.OnCreateCommand
}
if !container.UpdateContentCommand.IsEmpty() {
scripts.UpdateContentCommand = container.UpdateContentCommand
}
if !container.PostCreateCommand.IsEmpty() {
scripts.PostCreateCommand = container.PostCreateCommand
}
if !container.PostStartCommand.IsEmpty() {
scripts.PostStartCommand = container.PostStartCommand
}
}
}
// Sanitize the environment of any opts!
options.UnsetEnv()
// Remove the Docker config secret file!
if err := cleanupDockerConfigJSON(); err != nil {
return err
}
environ, err := os.ReadFile("/etc/environment")
if err == nil {
for _, env := range strings.Split(string(environ), "\n") {
pair := strings.SplitN(env, "=", 2)
if len(pair) != 2 {
continue
}
os.Setenv(pair[0], pair[1])
}
}
allEnvKeys := make(map[string]struct{})
// It must be set in this parent process otherwise nothing will be found!
for _, env := range configFile.Config.Env {
pair := strings.SplitN(env, "=", 2)
os.Setenv(pair[0], pair[1])
allEnvKeys[pair[0]] = struct{}{}
}
maps.Copy(containerEnv, buildParams.ContainerEnv)
maps.Copy(remoteEnv, buildParams.RemoteEnv)
// Set Envbuilder runtime markers
containerEnv["ENVBUILDER"] = "true"
if devcontainerPath != "" {
containerEnv["DEVCONTAINER"] = "true"
containerEnv["DEVCONTAINER_CONFIG"] = devcontainerPath
}
for _, env := range []map[string]string{containerEnv, remoteEnv} {
envKeys := make([]string, 0, len(env))
for key := range env {
envKeys = append(envKeys, key)
allEnvKeys[key] = struct{}{}
}
sort.Strings(envKeys)
for _, envVar := range envKeys {
value := devcontainer.SubstituteVars(env[envVar], opts.WorkspaceFolder, os.LookupEnv)
os.Setenv(envVar, value)
}
}
// Do not export env if we skipped a rebuild, because ENV directives
// from the Dockerfile would not have been processed and we'd miss these
// in the export. We should have generated a complete set of environment
// on the intial build, so exporting environment variables a second time
// isn't useful anyway.
if opts.ExportEnvFile != "" && !skippedRebuild {
exportEnvFile, err := os.Create(opts.ExportEnvFile)
if err != nil {
return fmt.Errorf("failed to open EXPORT_ENV_FILE %q: %w", opts.ExportEnvFile, err)
}
envKeys := make([]string, 0, len(allEnvKeys))
for key := range allEnvKeys {
envKeys = append(envKeys, key)
}
sort.Strings(envKeys)
for _, key := range envKeys {
fmt.Fprintf(exportEnvFile, "%s=%s\n", key, os.Getenv(key))
}
exportEnvFile.Close()
}
username := configFile.Config.User
if buildParams.User != "" {
username = buildParams.User
}
if username == "" {
opts.Logger(log.LevelWarn, "#3: no user specified, using root")
}
userInfo, err := getUser(username)
if err != nil {
return fmt.Errorf("update user: %w", err)
}
// We only need to do this if we cloned!
// Git doesn't store file permissions as part of the repository.
if cloned {
endStage := startStage("🔄 Updating the ownership of the workspace...")
// By default, we clone the Git repository into the workspace folder.
// It will have root permissions, because that's the user that built it.
//
// We need to change the ownership of the files to the user that will
// be running the init script.
if chownErr := filepath.Walk(opts.WorkspaceFolder, func(path string, _ os.FileInfo, err error) error {
if err != nil {
return err
}
return os.Chown(path, userInfo.uid, userInfo.gid)
}); chownErr != nil {
opts.Logger(log.LevelError, "chown %q: %s", userInfo.user.HomeDir, chownErr.Error())
endStage("⚠️ Failed to the ownership of the workspace, you may need to fix this manually!")
} else {
endStage("👤 Updated the ownership of the workspace!")
}
}
// We may also need to update the ownership of the user homedir.
// Skip this step if the user is root.
if userInfo.uid != 0 {
endStage := startStage("🔄 Updating ownership of %s...", userInfo.user.HomeDir)
if chownErr := filepath.Walk(userInfo.user.HomeDir, func(path string, _ fs.FileInfo, err error) error {
if err != nil {
return err
}
return os.Chown(path, userInfo.uid, userInfo.gid)
}); chownErr != nil {
opts.Logger(log.LevelError, "chown %q: %s", userInfo.user.HomeDir, chownErr.Error())
endStage("⚠️ Failed to update ownership of %s, you may need to fix this manually!", userInfo.user.HomeDir)
} else {
endStage("🏡 Updated ownership of %s!", userInfo.user.HomeDir)
}
}
err = os.MkdirAll(opts.WorkspaceFolder, 0o755)
if err != nil {
return fmt.Errorf("create workspace folder: %w", err)
}
err = os.Chdir(opts.WorkspaceFolder)
if err != nil {
return fmt.Errorf("change directory: %w", err)
}
// This is called before the Setuid to TARGET_USER because we want the
// lifecycle scripts to run using the default user for the container,
// rather than the user specified for running the init command. For
// example, TARGET_USER may be set to root in the case where we will
// exec systemd as the init command, but that doesn't mean we should
// run the lifecycle scripts as root.
os.Setenv("HOME", userInfo.user.HomeDir)
if err := execLifecycleScripts(ctx, opts, scripts, skippedRebuild, userInfo); err != nil {
return err
}
// The setup script can specify a custom initialization command
// and arguments to run instead of the default shell.
//
// This is useful for hooking into the environment for a specific
// init to PID 1.
if opts.SetupScript != "" {
// We execute the initialize script as the root user!
os.Setenv("HOME", "/root")
opts.Logger(log.LevelInfo, "=== Running the setup command %q as the root user...", opts.SetupScript)
envKey := "ENVBUILDER_ENV"
envFile := filepath.Join("/", constants.MagicDir, "environ")
file, err := os.Create(envFile)
if err != nil {
return fmt.Errorf("create environ file: %w", err)
}
_ = file.Close()
cmd := exec.CommandContext(ctx, "/bin/sh", "-c", opts.SetupScript)
cmd.Env = append(os.Environ(),
fmt.Sprintf("%s=%s", envKey, envFile),
fmt.Sprintf("TARGET_USER=%s", userInfo.user.Username),
)
cmd.Dir = opts.WorkspaceFolder
// This allows for a really nice and clean experience to experiement with!
// e.g. docker run --it --rm -e INIT_SCRIPT bash ...
if isatty.IsTerminal(os.Stdout.Fd()) && isatty.IsTerminal(os.Stdin.Fd()) {
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
cmd.Stdin = os.Stdin
} else {
var buf bytes.Buffer
go func() {
scanner := bufio.NewScanner(&buf)
for scanner.Scan() {
opts.Logger(log.LevelInfo, "%s", scanner.Text())
}
}()
cmd.Stdout = &buf
cmd.Stderr = &buf
}
err = cmd.Run()
if err != nil {
return fmt.Errorf("run setup script: %w", err)
}
environ, err := os.ReadFile(envFile)
if errors.Is(err, os.ErrNotExist) {
err = nil
environ = []byte{}
}
if err != nil {
return fmt.Errorf("read environ: %w", err)
}
updatedCommand := false
updatedArgs := false
for _, env := range strings.Split(string(environ), "\n") {
pair := strings.SplitN(env, "=", 2)
if len(pair) != 2 {
continue
}
key := pair[0]
switch key {
case "INIT_COMMAND":
opts.InitCommand = pair[1]
updatedCommand = true
case "INIT_ARGS":
initArgs, err = shellquote.Split(pair[1])
if err != nil {
return fmt.Errorf("split init args: %w", err)
}
updatedArgs = true
case "TARGET_USER":
userInfo, err = getUser(pair[1])
if err != nil {
return fmt.Errorf("update user: %w", err)
}
default:
return fmt.Errorf("unknown environ key %q", key)
}
}
if updatedCommand && !updatedArgs {
// Because our default is a shell we need to empty the args
// if the command was updated. This a tragic hack, but it works.
initArgs = []string{}
}
}
// Hop into the user that should execute the initialize script!
os.Setenv("HOME", userInfo.user.HomeDir)
err = syscall.Setgid(userInfo.gid)
if err != nil {
return fmt.Errorf("set gid: %w", err)
}
err = syscall.Setuid(userInfo.uid)
if err != nil {
return fmt.Errorf("set uid: %w", err)
}
opts.Logger(log.LevelInfo, "=== Running the init command %s %+v as the %q user...", opts.InitCommand, initArgs, userInfo.user.Username)
err = syscall.Exec(opts.InitCommand, append([]string{opts.InitCommand}, initArgs...), os.Environ())
if err != nil {
return fmt.Errorf("exec init script: %w", err)
}
return nil
}
// RunCacheProbe performs a 'dry-run' build of the image and checks that
// all of the resulting layers are present in options.CacheRepo.
func RunCacheProbe(ctx context.Context, opts options.Options) (v1.Image, error) {
defer options.UnsetEnv()
if !opts.GetCachedImage {
return nil, fmt.Errorf("developer error: RunCacheProbe must be run with --get-cached-image")
}
if opts.CacheRepo == "" {
return nil, fmt.Errorf("--cache-repo must be set when using --get-cached-image")
}
stageNumber := 0
startStage := func(format string, args ...any) func(format string, args ...any) {
now := time.Now()
stageNumber++
stageNum := stageNumber
opts.Logger(log.LevelInfo, "#%d: %s", stageNum, fmt.Sprintf(format, args...))
return func(format string, args ...any) {
opts.Logger(log.LevelInfo, "#%d: %s [%s]", stageNum, fmt.Sprintf(format, args...), time.Since(now))
}
}
opts.Logger(log.LevelInfo, "%s - Build development environments from repositories in a container", newColor(color.Bold).Sprintf("envbuilder"))
caBundle, err := initCABundle(opts.SSLCertBase64)
if err != nil {
return nil, err
}
cleanupDockerConfigJSON, err := initDockerConfigJSON(opts.DockerConfigBase64)
if err != nil {
return nil, err
}
defer func() {
if err := cleanupDockerConfigJSON(); err != nil {
opts.Logger(log.LevelError, "failed to cleanup docker config JSON: %w", err)
}
}() // best effort
var fallbackErr error
var cloned bool
if opts.GitURL != "" {
endStage := startStage("📦 Cloning %s to %s...",
newColor(color.FgCyan).Sprintf(opts.GitURL),
newColor(color.FgCyan).Sprintf(opts.WorkspaceFolder),
)
reader, writer := io.Pipe()
defer reader.Close()
defer writer.Close()
go func() {
data := make([]byte, 4096)
for {
read, err := reader.Read(data)
if err != nil {
return
}
content := data[:read]
for _, line := range strings.Split(string(content), "\r") {
if line == "" {
continue
}
opts.Logger(log.LevelInfo, "#1: %s", strings.TrimSpace(line))
}
}
}()
cloneOpts := git.CloneRepoOptions{
Path: opts.WorkspaceFolder,
Storage: opts.Filesystem,
Insecure: opts.Insecure,
Progress: writer,
SingleBranch: opts.GitCloneSingleBranch,
Depth: int(opts.GitCloneDepth),
CABundle: caBundle,
}
cloneOpts.RepoAuth = git.SetupRepoAuth(&opts)
if opts.GitHTTPProxyURL != "" {
cloneOpts.ProxyOptions = transport.ProxyOptions{
URL: opts.GitHTTPProxyURL,
}
}
cloneOpts.RepoURL = opts.GitURL
cloned, fallbackErr = git.CloneRepo(ctx, cloneOpts)
if fallbackErr == nil {
if cloned {
endStage("📦 Cloned repository!")
} else {
endStage("📦 The repository already exists!")
}
} else {
opts.Logger(log.LevelError, "Failed to clone repository: %s", fallbackErr.Error())
opts.Logger(log.LevelError, "Falling back to the default image...")
}
}
defaultBuildParams := func() (*devcontainer.Compiled, error) {
dockerfile := filepath.Join(constants.MagicDir, "Dockerfile")
file, err := opts.Filesystem.OpenFile(dockerfile, os.O_CREATE|os.O_WRONLY, 0o644)
if err != nil {
return nil, err
}
defer file.Close()
if opts.FallbackImage == "" {
if fallbackErr != nil {
return nil, fmt.Errorf("%s: %w", fallbackErr.Error(), constants.ErrNoFallbackImage)
}
// We can't use errors.Join here because our tests
// don't support parsing a multiline error.
return nil, constants.ErrNoFallbackImage
}
content := "FROM " + opts.FallbackImage
_, err = file.Write([]byte(content))
if err != nil {
return nil, err
}
return &devcontainer.Compiled{
DockerfilePath: dockerfile,
DockerfileContent: content,
BuildContext: constants.MagicDir,
}, nil
}
var (
buildParams *devcontainer.Compiled
devcontainerPath string
)
if opts.DockerfilePath == "" {
// Only look for a devcontainer if a Dockerfile wasn't specified.
// devcontainer is a standard, so it's reasonable to be the default.
var devcontainerDir string
var err error
devcontainerPath, devcontainerDir, err = findDevcontainerJSON(opts)
if err != nil {
opts.Logger(log.LevelError, "Failed to locate devcontainer.json: %s", err.Error())
opts.Logger(log.LevelError, "Falling back to the default image...")
} else {
// We know a devcontainer exists.
// Let's parse it and use it!
file, err := opts.Filesystem.Open(devcontainerPath)
if err != nil {
return nil, fmt.Errorf("open devcontainer.json: %w", err)
}
defer file.Close()
content, err := io.ReadAll(file)
if err != nil {
return nil, fmt.Errorf("read devcontainer.json: %w", err)
}
devContainer, err := devcontainer.Parse(content)
if err == nil {
var fallbackDockerfile string
if !devContainer.HasImage() && !devContainer.HasDockerfile() {