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test(e2e): validate 8 upstream bug fixes against real Docker
Add e2e tests that provision real containers/images to prove the upstream-bug fixes actually work end-to-end and to guard against regressions: - #331 Feature install sees a non-empty _REMOTE_USER_HOME - #308 Feature containerEnv ${localEnv:...} is substituted - #844 --remove-existing-container removes before initializeCommand - #930 compose `build --label` applies without --image-name - #969 sibling <Dockerfile>.dockerignore survives the stage rename - #109 updateRemoteUserUID remaps even when the home dir is absent The #331 test caught a real regression in the fix itself: `$(` with no trailing space made the shell parse `$((` as arithmetic expansion and abort the Feature build. Fixed by inserting a space after `$(` in generateFeatureBuildEnvVars. The #109 test asserts the UID/GID remap actually took effect (not just that `up` succeeds): pre-fix the chown aborted the remap build, the wrapper swallowed it, and the remap silently no-op'd. The fixture uses a base image without a uid/gid-1000 user so the remap proceeds to the chown path being validated. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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Lines changed: 228 additions & 2 deletions

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‎internal/cli/e2e_fixes_test.go‎

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package cli
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import (
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"os"
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"os/exec"
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"path/filepath"
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"strconv"
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"strings"
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"testing"
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)
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// writeFixture materializes a self-contained workspace from a path->content map
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// under a temp dir and returns the workspace root.
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func writeFixture(t *testing.T, files map[string]string) string {
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t.Helper()
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root := t.TempDir()
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for rel, content := range files {
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p := filepath.Join(root, rel)
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if err := os.MkdirAll(filepath.Dir(p), 0o755); err != nil {
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t.Fatal(err)
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}
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if err := os.WriteFile(p, []byte(content), 0o644); err != nil {
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t.Fatal(err)
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}
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}
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return root
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}
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// dockerExec runs `docker exec <id> sh -lc <cmd>` and returns trimmed combined output.
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func dockerExec(t *testing.T, id, cmd string) string {
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t.Helper()
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out, err := exec.Command("docker", "exec", id, "sh", "-c", cmd).CombinedOutput()
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if err != nil {
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t.Fatalf("docker exec %q failed: %v\n%s", cmd, err, out)
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}
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return strings.TrimSpace(string(out))
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}
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func removeByID(id string) {
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if id != "" {
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exec.Command("docker", "rm", "-f", id).Run()
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}
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}
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// TestE2E_FeatureUserHomeAndLocalEnv validates two upstream fixes on a real
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// build+up with a local Feature:
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// - #331: the Feature install script sees a non-empty _REMOTE_USER_HOME.
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// - #308: a Feature's containerEnv ${localEnv:VAR} is resolved (not literal).
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func TestE2E_FeatureUserHomeAndLocalEnv(t *testing.T) {
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if !dockerAvailable() {
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t.Skip("Docker not available")
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}
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t.Setenv("E2E_LOCALENV_MARKER", "resolved-localenv-1234")
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ws := writeFixture(t, map[string]string{
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".devcontainer/devcontainer.json": `{
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"image": "mcr.microsoft.com/devcontainers/base:ubuntu",
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"remoteUser": "vscode",
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"features": { "./localfeat": {} }
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}`,
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".devcontainer/localfeat/devcontainer-feature.json": `{
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"id": "localfeat",
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"version": "1.0.0",
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"name": "localfeat",
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"containerEnv": { "MY_LOCAL_ENV": "${localEnv:E2E_LOCALENV_MARKER}" }
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}`,
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".devcontainer/localfeat/install.sh": "#!/bin/sh\nset -e\n" +
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`echo "REMOTE_USER_HOME=[$_REMOTE_USER_HOME]" > /e2e-feature-marker` + "\n",
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})
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upOut := runCLI(t, "up", "--workspace-folder", ws, "--skip-post-create")
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assertOutcome(t, upOut, "success")
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id, _ := parseJSON(t, upOut)["containerId"].(string)
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if id == "" {
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t.Fatal("no containerId")
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}
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defer removeByID(id)
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// #331: install.sh captured the remote user's home at build time.
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if got := dockerExec(t, id, "cat /e2e-feature-marker"); !strings.Contains(got, "REMOTE_USER_HOME=[/home/vscode]") {
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t.Errorf("#331 _REMOTE_USER_HOME not resolved in Feature build: %q", got)
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}
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// #308: the Feature's containerEnv ${localEnv:...} was substituted.
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if got := dockerExec(t, id, "printenv MY_LOCAL_ENV"); got != "resolved-localenv-1234" {
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t.Errorf("#308 Feature containerEnv ${localEnv} = %q, want resolved-localenv-1234", got)
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}
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}
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// TestE2E_RemoveExistingBeforeInitialize validates #844: with
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// --remove-existing-container, the old container is removed BEFORE
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// initializeCommand, so a failing initializeCommand does not leave it running.
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func TestE2E_RemoveExistingBeforeInitialize(t *testing.T) {
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if !dockerAvailable() {
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t.Skip("Docker not available")
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}
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ws := writeFixture(t, map[string]string{
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".devcontainer/devcontainer.json": `{"image":"mcr.microsoft.com/devcontainers/base:ubuntu","overrideCommand":true}`,
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})
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// 1) Provision the container.
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upOut := runCLI(t, "up", "--workspace-folder", ws, "--skip-post-create")
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assertOutcome(t, upOut, "success")
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oldID, _ := parseJSON(t, upOut)["containerId"].(string)
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if oldID == "" {
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t.Fatal("no containerId")
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}
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defer removeByID(oldID)
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// 2) Add a failing initializeCommand, then up --remove-existing-container.
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// The up must fail (init exits 1) — but the old container must be gone.
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if err := os.WriteFile(filepath.Join(ws, ".devcontainer", "devcontainer.json"),
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[]byte(`{"image":"mcr.microsoft.com/devcontainers/base:ubuntu","overrideCommand":true,"initializeCommand":"exit 1"}`), 0o644); err != nil {
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t.Fatal(err)
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}
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upOut2 := runCLI(t, "up", "--workspace-folder", ws, "--remove-existing-container", "--skip-post-create")
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if oc := parseJSON(t, upOut2)["outcome"]; oc != "error" {
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t.Fatalf("second up outcome = %v, want error (initializeCommand fails)", oc)
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}
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// The old container must have been removed before initializeCommand ran.
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if exec.Command("docker", "inspect", oldID).Run() == nil {
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t.Errorf("#844 old container %s still exists after a failed rebuild; removal did not precede initializeCommand", oldID[:12])
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}
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}
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// TestE2E_ComposeBuildLabel validates #930: `build --label` on a Compose config
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// applies the label even without --image-name.
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func TestE2E_ComposeBuildLabel(t *testing.T) {
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if !dockerAvailable() {
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t.Skip("Docker not available")
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}
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ws := writeFixture(t, map[string]string{
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"docker-compose.yml": "services:\n app:\n build:\n context: .\n dockerfile: Dockerfile\n command: sleep infinity\n",
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"Dockerfile": "FROM mcr.microsoft.com/devcontainers/base:ubuntu\n",
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".devcontainer/devcontainer.json": `{
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"dockerComposeFile": "../docker-compose.yml",
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"service": "app",
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"workspaceFolder": "/workspace"
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}`,
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})
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buildOut := runCLI(t, "build", "--workspace-folder", ws, "--label", "e2e.compose.label=applied")
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assertOutcome(t, buildOut, "success")
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names, _ := parseJSON(t, buildOut)["imageName"].([]interface{})
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if len(names) == 0 {
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t.Fatal("no imageName in build output")
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}
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img, _ := names[0].(string)
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defer exec.Command("docker", "rmi", "-f", img).Run()
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out, err := exec.Command("docker", "inspect", "--format", `{{index .Config.Labels "e2e.compose.label"}}`, img).CombinedOutput()
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if err != nil {
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t.Fatalf("inspect %s failed: %v\n%s", img, err, out)
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}
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if got := strings.TrimSpace(string(out)); got != "applied" {
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t.Errorf("#930 image %s label e2e.compose.label = %q, want applied (dropped without --image-name)", img, got)
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}
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}
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// TestE2E_SiblingDockerignore validates #969: when the Dockerfile is renamed to
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// inject a final stage name, the user's sibling <Dockerfile>.dockerignore still
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// applies, so excluded files do not leak into the build context.
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func TestE2E_SiblingDockerignore(t *testing.T) {
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if !dockerAvailable() {
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t.Skip("Docker not available")
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}
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// The Dockerfile has an UNNAMED final stage, so the CLI rewrites it to a temp
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// file (the path that used to drop the sibling .dockerignore).
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ws := writeFixture(t, map[string]string{
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".devcontainer/devcontainer.json": `{"build":{"dockerfile":"Dockerfile"}}`,
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".devcontainer/Dockerfile": "FROM mcr.microsoft.com/devcontainers/base:ubuntu\nCOPY . /ctx-check/\nRUN if [ -e /ctx-check/secret.txt ]; then echo LEAKED > /dockerignore-result; else echo IGNORED_OK > /dockerignore-result; fi\n",
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".devcontainer/Dockerfile.dockerignore": "secret.txt\n",
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".devcontainer/secret.txt": "SUPERSECRET\n",
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})
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buildOut := runCLI(t, "build", "--workspace-folder", ws, "--image-name", "e2e-dockerignore:test")
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assertOutcome(t, buildOut, "success")
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defer exec.Command("docker", "rmi", "-f", "e2e-dockerignore:test").Run()
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out, err := exec.Command("docker", "run", "--rm", "e2e-dockerignore:test", "cat", "/dockerignore-result").CombinedOutput()
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if err != nil {
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t.Fatalf("docker run failed: %v\n%s", err, out)
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}
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if got := strings.TrimSpace(string(out)); got != "IGNORED_OK" {
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t.Errorf("#969 sibling .dockerignore not applied on rename: got %q (secret.txt leaked into the context)", got)
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}
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}
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// TestE2E_UpdateUIDSystemUser validates #109: updateRemoteUserUID's chown no
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// longer aborts the remap build when the remote user has no home dir on disk
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// (system user). Pre-fix the chown failed, the wrapper swallowed it, and the
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// UID/GID remap silently did NOT happen; post-fix the remap succeeds. We assert
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// the remap actually took effect (svcuser's uid == the host uid).
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func TestE2E_UpdateUIDSystemUser(t *testing.T) {
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if !dockerAvailable() {
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t.Skip("Docker not available")
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}
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if os.Getuid() == 0 {
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t.Skip("updateRemoteUserUID is a no-op when the host runs as root")
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}
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ws := writeFixture(t, map[string]string{
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".devcontainer/devcontainer.json": `{"build":{"dockerfile":"Dockerfile"},"remoteUser":"svcuser","updateRemoteUserUID":true,"overrideCommand":true}`,
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// A system user (uid 999) with a home path in /etc/passwd that does NOT
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// exist on disk — the case where the pre-fix chown -R aborted the build.
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// The base MUST NOT already own uid/gid 1000 (the host uid/gid), or the
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// remap short-circuits on "user with UID exists" and never reaches the
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// chown. Plain ubuntu:22.04 has neither, so the remap proceeds.
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".devcontainer/Dockerfile": "FROM ubuntu:22.04\n" +
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"RUN useradd --system --no-create-home --home-dir /home/svcuser --shell /bin/sh svcuser\n",
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})
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upOut := runCLI(t, "up", "--workspace-folder", ws, "--skip-post-create")
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assertOutcome(t, upOut, "success")
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id, _ := parseJSON(t, upOut)["containerId"].(string)
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if id == "" {
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t.Fatal("no containerId")
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}
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defer removeByID(id)
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wantUID := strconv.Itoa(os.Getuid())
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if got := dockerExec(t, id, "getent passwd svcuser | cut -d: -f3"); got != wantUID {
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t.Errorf("#109 svcuser uid = %q, want %q — the UID/GID remap silently no-op'd (chown aborted the build)", got, wantUID)
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}
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}

‎internal/imagemeta/extend.go‎

Lines changed: 4 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -236,8 +236,10 @@ func generateFeatureBuildEnvVars(feat features.Feature, containerUser, remoteUse
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// common-utils may have just created the user, so a later feature must see
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// its home) — matching the TS CLI's _REMOTE_USER_HOME / _CONTAINER_USER_HOME
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// builtins. Command substitution, so these must not be single-quoted.
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fmt.Sprintf(`_CONTAINER_USER_HOME="$(%s | cut -d: -f6)"`, getEntPasswdExpr(containerUser)),
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fmt.Sprintf(`_REMOTE_USER_HOME="$(%s | cut -d: -f6)"`, getEntPasswdExpr(remoteUser)),
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// Note the space after `$(`: without it the leading `(` makes the shell
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// parse `$((` as arithmetic expansion and fail.
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fmt.Sprintf(`_CONTAINER_USER_HOME="$( %s | cut -d: -f6)"`, getEntPasswdExpr(containerUser)),
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fmt.Sprintf(`_REMOTE_USER_HOME="$( %s | cut -d: -f6)"`, getEntPasswdExpr(remoteUser)),
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)
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// Main value — TS normalizes option objects to true and only emits the

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