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package build // import "github.com/docker/docker/integration/build"
import (
"bufio"
"bytes"
"context"
"io"
"os"
"strings"
"testing"
"github.com/docker/docker/api/types"
"github.com/docker/docker/integration/internal/container"
"github.com/docker/docker/pkg/jsonmessage"
"github.com/docker/docker/pkg/stdcopy"
"github.com/docker/docker/testutil/daemon"
"github.com/docker/docker/testutil/fakecontext"
"github.com/docker/docker/testutil/fixtures/load"
"gotest.tools/v3/assert"
"gotest.tools/v3/skip"
)
// Implements a test for https://github.com/moby/moby/issues/41723
// Images built in a user-namespaced daemon should have capabilities serialised in
// VFS_CAP_REVISION_2 (no user-namespace root uid) format rather than V3 (that includes
// the root uid).
func TestBuildUserNamespaceValidateCapabilitiesAreV2(t *testing.T) {
skip.If(t, testEnv.DaemonInfo.OSType != "linux")
skip.If(t, testEnv.IsRemoteDaemon())
skip.If(t, !testEnv.IsUserNamespaceInKernel())
skip.If(t, testEnv.IsRootless())
const imageTag = "capabilities:1.0"
tmp, err := os.MkdirTemp("", "integration-")
assert.NilError(t, err)
defer os.RemoveAll(tmp)
dUserRemap := daemon.New(t)
dUserRemap.Start(t, "--userns-remap", "default")
ctx := context.Background()
clientUserRemap := dUserRemap.NewClientT(t)
defer clientUserRemap.Close()
err = load.FrozenImagesLinux(clientUserRemap, "debian:bullseye-slim")
assert.NilError(t, err)
dUserRemapRunning := true
defer func() {
if dUserRemapRunning {
dUserRemap.Stop(t)
dUserRemap.Cleanup(t)
}
}()
dockerfile := `
FROM debian:bullseye-slim
RUN apt-get update && apt-get install -y libcap2-bin --no-install-recommends
RUN setcap CAP_NET_BIND_SERVICE=+eip /bin/sleep
`
source := fakecontext.New(t, "", fakecontext.WithDockerfile(dockerfile))
defer source.Close()
resp, err := clientUserRemap.ImageBuild(ctx,
source.AsTarReader(t),
types.ImageBuildOptions{
Tags: []string{imageTag},
})
assert.NilError(t, err)
defer resp.Body.Close()
buf := bytes.NewBuffer(nil)
err = jsonmessage.DisplayJSONMessagesStream(resp.Body, buf, 0, false, nil)
assert.NilError(t, err)
reader, err := clientUserRemap.ImageSave(ctx, []string{imageTag})
assert.NilError(t, err, "failed to download capabilities image")
defer reader.Close()
tar, err := os.Create(tmp + "/image.tar")
assert.NilError(t, err, "failed to create image tar file")
defer tar.Close()
_, err = io.Copy(tar, reader)
assert.NilError(t, err, "failed to write image tar file")
dUserRemap.Stop(t)
dUserRemap.Cleanup(t)
dUserRemapRunning = false
dNoUserRemap := daemon.New(t)
dNoUserRemap.Start(t)
defer func() {
dNoUserRemap.Stop(t)
dNoUserRemap.Cleanup(t)
}()
clientNoUserRemap := dNoUserRemap.NewClientT(t)
defer clientNoUserRemap.Close()
tarFile, err := os.Open(tmp + "/image.tar")
assert.NilError(t, err, "failed to open image tar file")
defer tarFile.Close()
tarReader := bufio.NewReader(tarFile)
loadResp, err := clientNoUserRemap.ImageLoad(ctx, tarReader, false)
assert.NilError(t, err, "failed to load image tar file")
defer loadResp.Body.Close()
buf = bytes.NewBuffer(nil)
err = jsonmessage.DisplayJSONMessagesStream(loadResp.Body, buf, 0, false, nil)
assert.NilError(t, err)
cid := container.Run(ctx, t, clientNoUserRemap,
container.WithImage(imageTag),
container.WithCmd("/sbin/getcap", "-n", "/bin/sleep"),
)
logReader, err := clientNoUserRemap.ContainerLogs(ctx, cid, types.ContainerLogsOptions{
ShowStdout: true,
})
assert.NilError(t, err)
defer logReader.Close()
actualStdout := new(bytes.Buffer)
actualStderr := io.Discard
_, err = stdcopy.StdCopy(actualStdout, actualStderr, logReader)
assert.NilError(t, err)
if strings.TrimSpace(actualStdout.String()) != "/bin/sleep cap_net_bind_service=eip" {
t.Fatalf("run produced invalid output: %q, expected %q", actualStdout.String(), "/bin/sleep cap_net_bind_service=eip")
}
}
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