connhelper: add e2e

Signed-off-by: Akihiro Suda <suda.akihiro@lab.ntt.co.jp>

docker.Makefile

@@ -105,7 +105,7 @@ shellcheck: build_shell_validate_image ## run shellcheck validation
 	docker run -ti --rm $(ENVVARS) $(MOUNTS) $(VALIDATE_IMAGE_NAME) make shellcheck
 
 .PHONY: test-e2e ## run e2e tests
-test-e2e: test-e2e-non-experimental test-e2e-experimental
+test-e2e: test-e2e-non-experimental test-e2e-experimental test-e2e-connhelper-ssh
 
 .PHONY: test-e2e-experimental
 test-e2e-experimental: build_e2e_image
@@ -115,6 +115,10 @@ test-e2e-experimental: build_e2e_image
 test-e2e-non-experimental: build_e2e_image
 	docker run --rm -v /var/run/docker.sock:/var/run/docker.sock $(E2E_IMAGE_NAME)
 
+.PHONY: test-e2e-connhelper-ssh
+test-e2e-connhelper-ssh: build_e2e_image
+	docker run -e TEST_CONNHELPER=ssh -e DOCKERD_EXPERIMENTAL=1 --rm -v /var/run/docker.sock:/var/run/docker.sock $(E2E_IMAGE_NAME)
+
 .PHONY: help
 help: ## print this help
 	@awk 'BEGIN {FS = ":.*?## "} /^[a-zA-Z_-]+:.*?## / {sub("\\\\n",sprintf("\n%22c"," "), $$2);printf "\033[36m%-20s\033[0m %s\n", $$1, $$2}' $(MAKEFILE_LIST)

dockerfiles/Dockerfile.e2e

@@ -13,6 +13,7 @@ RUN apt-get update && apt-get install -y \
     libapparmor-dev \
     libseccomp-dev \
     iptables \
+    openssh-client \
     && rm -rf /var/lib/apt/lists/*
 
 ARG COMPOSE_VERSION=1.21.2

e2e/compose-env.connhelper-ssh.yaml

@@ -0,0 +1,9 @@
+version: '2.1'
+
+services:
+  engine:
+      build:
+        context: ./testdata
+        dockerfile: Dockerfile.connhelper-ssh
+      environment:
+        - TEST_CONNHELPER_SSH_ID_RSA_PUB

e2e/testdata/Dockerfile.connhelper-ssh

@@ -0,0 +1,14 @@
+FROM docker:test-dind
+RUN apk --no-cache add shadow openssh-server && \
+  groupadd -f docker && \
+  useradd -m penguin && \
+  usermod -aG docker penguin && \
+  usermod -p $(head -c32 /dev/urandom | base64) penguin && \
+  chsh -s /bin/sh penguin && \
+  ssh-keygen -A
+# workaround: ssh session excludes /usr/local/bin from $PATH
+RUN  ln -s /usr/local/bin/docker /usr/bin/docker
+COPY ./connhelper-ssh/entrypoint.sh /
+EXPOSE 22
+ENTRYPOINT ["/entrypoint.sh"]
+# usage: docker run --privileged -e TEST_CONNHELPER_SSH_ID_RSA_PUB=$(cat ~/.ssh/id_rsa.pub) -p 22 $THIS_IMAGE

e2e/testdata/connhelper-ssh/entrypoint.sh

@@ -0,0 +1,8 @@
+#!/bin/sh
+set -ex
+mkdir -m 0700 -p /home/penguin/.ssh
+echo ${TEST_CONNHELPER_SSH_ID_RSA_PUB} > /home/penguin/.ssh/authorized_keys
+chmod 0600 /home/penguin/.ssh/authorized_keys
+chown -R penguin:penguin /home/penguin
+/usr/sbin/sshd -E /var/log/sshd.log
+exec dockerd-entrypoint.sh $@

internal/test/environment/testenv.go

@@ -1,15 +1,13 @@
 package environment
 
 import (
-	"context"
 	"os"
 	"strings"
 	"testing"
 	"time"
 
-	"github.com/docker/docker/client"
 	"github.com/pkg/errors"
-	"gotest.tools/assert"
+	"gotest.tools/icmd"
 	"gotest.tools/poll"
 	"gotest.tools/skip"
 )
@@ -79,21 +77,14 @@ func boolFromString(val string) bool {
 	}
 }
 
-func dockerClient(t *testing.T) client.APIClient {
-	t.Helper()
-	c, err := client.NewClientWithOpts(client.FromEnv, client.WithVersion("1.37"))
-	assert.NilError(t, err)
-	return c
-}
-
 // DefaultPollSettings used with gotestyourself/poll
 var DefaultPollSettings = poll.WithDelay(100 * time.Millisecond)
 
 // SkipIfNotExperimentalDaemon returns whether the test docker daemon is in experimental mode
 func SkipIfNotExperimentalDaemon(t *testing.T) {
 	t.Helper()
-	c := dockerClient(t)
-	info, err := c.Info(context.Background())
-	assert.NilError(t, err)
-	skip.If(t, !info.ExperimentalBuild, "running against a non-experimental daemon")
+	result := icmd.RunCmd(icmd.Command("docker", "info", "--format", "{{.ExperimentalBuild}}"))
+	result.Assert(t, icmd.Expected{Err: icmd.None})
+	experimentalBuild := strings.TrimSpace(result.Stdout()) == "true"
+	skip.If(t, !experimentalBuild, "running against a non-experimental daemon")
 }

scripts/test/e2e/run

@@ -18,6 +18,14 @@ function setup {
     local file=$2
 
     test "${DOCKERD_EXPERIMENTAL:-}" -eq "1" && file="${file}:./e2e/compose-env.experimental.yaml"
+
+    if [[ "${TEST_CONNHELPER:-}" = "ssh" ]];then
+        test ! -f "${HOME}/.ssh/id_rsa" && ssh-keygen -t rsa -C docker-e2e-dummy -N "" -f "${HOME}/.ssh/id_rsa" -q
+        grep "^StrictHostKeyChecking no" "${HOME}/.ssh/config" > /dev/null 2>&1 || echo "StrictHostKeyChecking no" > "${HOME}/.ssh/config"
+        TEST_CONNHELPER_SSH_ID_RSA_PUB=$(cat "${HOME}/.ssh/id_rsa.pub")
+        export TEST_CONNHELPER_SSH_ID_RSA_PUB
+        file="${file}:./e2e/compose-env.connhelper-ssh.yaml"
+    fi
     COMPOSE_PROJECT_NAME=$project COMPOSE_FILE=$file docker-compose up --build -d >&2
 
     local network="${project}_default"
@@ -26,6 +34,9 @@ function setup {
 
     engine_ip="$(container_ip "${project}_engine_1" "$network")"
     engine_host="tcp://$engine_ip:2375"
+    if [[ "${TEST_CONNHELPER:-}" = "ssh" ]];then
+        engine_host="ssh://penguin@${engine_ip}"
+    fi
     (
         export DOCKER_HOST="$engine_host"
         timeout 200 ./scripts/test/e2e/wait-on-daemon
@@ -57,7 +68,7 @@ function runtests {
         TEST_REMOTE_DAEMON="${REMOTE_DAEMON-}" \
         TEST_SKIP_PLUGIN_TESTS="${SKIP_PLUGIN_TESTS-}" \
         GOPATH="$GOPATH" \
-        PATH="$PWD/build/" \
+        PATH="$PWD/build/:/usr/bin" \
         "$(which go)" test -v ./e2e/... ${TESTFLAGS-}
 }