sandbox: add gvisor runsc-based sandbox

This creates a VM (running Container-Optimized OS) with configuration such that it boots up and downloads/configures the runsc Docker runtime, reloading the existing Docker daemon on the VM, and then creates a new privileged Docker container with the host's /var/run/docker.sock available to the container. From within that container it's then possible for the new sandbox HTTP server to create its own Docker containers running under gvisor (using docker run --runtime=runsc). This then adds a regional us-central1 load balancer and instance group manager & instane template to run these VMs automatically across us-central1. Then the play.golang.org frontend can hit that URL (http://sandbox.play-sandbox-fwd.il4.us-central1.lb.golang-org.internal) Fixes golang/go#25224 Updates golang/go#30439 (remove nacl) Updates golang/go#33629 (this CL makes the playground support 2 versions) Change-Id: I56c8a86875abcde9d29fa7592b23c0ecd3861458 Reviewed-on: https://go-review.googlesource.com/c/playground/+/195983 Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org> Reviewed-by: Alexander Rakoczy <alex@golang.org> Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com>
golang · Jan 8, 2020 · 4d36241 · 4d36241
1 parent a46a9c2
commit 4d36241
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Showing 18 changed files with 1,066 additions and 58 deletions.
diff --git a/.gitignore b/.gitignore
@@ -0,0 +1 @@
+.terraform
diff --git a/Dockerfile b/Dockerfile
@@ -2,12 +2,14 @@
 # Use of this source code is governed by a BSD-style
 # license that can be found in the LICENSE file.
 
+############################################################################
 FROM debian:stretch AS nacl
 
 RUN apt-get update && apt-get install -y --no-install-recommends curl bzip2 ca-certificates
 
 RUN curl -s https://storage.googleapis.com/nativeclient-mirror/nacl/nacl_sdk/trunk.544461/naclsdk_linux.tar.bz2 | tar -xj -C /tmp --strip-components=2 pepper_67/tools/sel_ldr_x86_64
 
+############################################################################
 FROM debian:stretch AS build
 LABEL maintainer="golang-dev@googlegroups.com"
 
@@ -64,12 +66,32 @@ COPY . /go/src/playground/
 WORKDIR /go/src/playground
 RUN go install
 
+############################################################################
+# Temporary Docker stage to add a pre-Go1.14 $GOROOT into our
+# container for early linux/amd64 testing.
+FROM golang:1.13 AS temp_pre_go14
+
+ENV BUILD_DEPS 'curl git gcc patch libc6-dev ca-certificates'
+RUN apt-get update && apt-get install -y --no-install-recommends ${BUILD_DEPS}
+
+# go1.14beta1:
+ENV GO_REV a5bfd9da1d1b24f326399b6b75558ded14514f23
+
+RUN cd /usr/local && git clone https://go.googlesource.com/go go1.14 && cd go1.14 && git reset --hard ${GO_REV}
+WORKDIR /usr/local/go1.14/src
+RUN ./make.bash
+ENV GOROOT /usr/local/go1.14
+RUN ../bin/go install --tags=faketime std
+
+############################################################################
+# Final stage.
 FROM debian:stretch
 
 RUN apt-get update && apt-get install -y git ca-certificates --no-install-recommends
 
 COPY --from=build /usr/local/go /usr/local/go
 COPY --from=nacl /tmp/sel_ldr_x86_64 /usr/local/bin
+COPY --from=temp_pre_go14 /usr/local/go1.14 /usr/local/go1.14
 
 ENV GOPATH /go
 ENV PATH /usr/local/go/bin:$GOPATH/bin:$PATH
@@ -101,9 +123,6 @@ COPY edit.html /app
 COPY static /app/static
 WORKDIR /app
 
-# Run tests
-RUN /app/playground test
-
 # Whether we allow third-party imports via proxy.golang.org:
 ENV ALLOW_PLAY_MODULE_DOWNLOADS true
 

diff --git a/Makefile b/Makefile
@@ -9,12 +9,27 @@ GCLOUD_ACCESS_TOKEN := $(shell gcloud auth print-access-token)
 docker:
 	docker build -t golang/playground .
 
-test:
+runlocal:
+	docker network create sandnet || true
+	docker kill play_dev || true
+	docker run --name=play_dev --rm --network=sandnet -ti -p 127.0.0.1:8081:8080/tcp golang/playground
+
+test_go:
 	# Run fast tests first: (and tests whether, say, things compile)
 	GO111MODULE=on go test -v
-	# Then run the slower tests, which happen as one of the
-	# Dockerfile RUN steps:
-	docker build -t golang/playground .
+
+test_nacl: docker
+	docker kill sandbox_front_test || true
+	docker run --rm --name=sandbox_front_test --network=sandnet -t golang/playground testnacl
+
+test_gvisor: docker
+	docker kill sandbox_front_test || true
+	docker run --rm --name=sandbox_front_test --network=sandnet -t golang/playground test
+
+# Note: test_gvisor is not included in "test" yet, because it requires
+# running a separate server first ("make runlocal" in the sandbox
+# directory)
+test: test_go test_nacl
 
 update-cloudbuild-trigger:
 	# The gcloud CLI doesn't yet support updating a trigger.

diff --git a/go.sum b/go.sum
@@ -59,14 +59,12 @@ golang.org/x/net v0.0.0-20180724234803-3673e40ba225/go.mod h1:mL1N/T3taQHkDXs73r
 golang.org/x/net v0.0.0-20180826012351-8a410e7b638d/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
 golang.org/x/net v0.0.0-20190108225652-1e06a53dbb7e/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
 golang.org/x/net v0.0.0-20190213061140-3a22650c66bd/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
-golang.org/x/net v0.0.0-20190311183353-d8887717615a h1:oWX7TPOiFAMXLq8o0ikBYfCJVlRHBcsciT5bXOrH628=
 golang.org/x/net v0.0.0-20190311183353-d8887717615a/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
 golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
 golang.org/x/net v0.0.0-20190502183928-7f726cade0ab/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
 golang.org/x/net v0.0.0-20190620200207-3b0461eec859 h1:R/3boaszxrf1GEUWTVDzSKVwLmSJpwZ1yqXm8j0v2QI=
 golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/oauth2 v0.0.0-20180821212333-d2e6202438be/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
-golang.org/x/oauth2 v0.0.0-20190226205417-e64efc72b421 h1:Wo7BWFiOk0QRFMLYMqJGFMd9CgUAcGx7V+qEg/h5IBI=
 golang.org/x/oauth2 v0.0.0-20190226205417-e64efc72b421/go.mod h1:gOpvHmFTYa4IltrdGE7lF6nIHvwfUNPOp7c8zoXwtLw=
 golang.org/x/oauth2 v0.0.0-20190402181905-9f3314589c9a h1:tImsplftrFpALCYumobsd0K86vlAs/eXGFms2txfJfA=
 golang.org/x/oauth2 v0.0.0-20190402181905-9f3314589c9a/go.mod h1:gOpvHmFTYa4IltrdGE7lF6nIHvwfUNPOp7c8zoXwtLw=
@@ -75,16 +73,13 @@ golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f/go.mod h1:RxMgew5VJxzue5/jJ
 golang.org/x/sync v0.0.0-20181108010431-42b317875d0f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20181221193216-37e7f081c4d4/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20190227155943-e225da77a7e6/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
-golang.org/x/sync v0.0.0-20190423024810-112230192c58 h1:8gQV6CLnAEikrhgkHFbMAEhagSSnXWGV915qUMm9mrU=
 golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sys v0.0.0-20180830151530-49385e6e1522/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
-golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a h1:1BGLXjeY4akVXGgbC9HugT3Jv3hCI0z56oJR5vAMgBU=
 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190502175342-a43fa875dd82 h1:vsphBvatvfbhlb4PO1BYSr9dzugGxJ/SQHoNufZJq1w=
 golang.org/x/sys v0.0.0-20190502175342-a43fa875dd82/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
-golang.org/x/text v0.3.1-0.20180807135948-17ff2d5776d2 h1:z99zHgr7hKfrUcX/KsoJk5FJfjTceCKIp96+biqP4To=
 golang.org/x/text v0.3.1-0.20180807135948-17ff2d5776d2/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.2 h1:tW2bmiBqwgJj/UpqtC8EpXEZVYOwU0yG4iWbprSVAcs=
 golang.org/x/text v0.3.2/go.mod h1:bEr9sfX3Q8Zfm5fL9x+3itogRgK3+ptLWKqgva+5dAk=
@@ -103,17 +98,14 @@ golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8T
 google.golang.org/api v0.4.0 h1:KKgc1aqhV8wDPbDzlDtpvyjZFY3vjz85FP7p4wcQUyI=
 google.golang.org/api v0.4.0/go.mod h1:8k5glujaEP+g9n7WNsDg8QP6cUVNI86fCNMcbazEtwE=
 google.golang.org/appengine v1.1.0/go.mod h1:EbEs0AVv82hx2wNQdGPgUI5lhzA/G0D9YwlJXL52JkM=
-google.golang.org/appengine v1.4.0 h1:/wp5JvzpHIxhs/dumFmF7BXTf3Z+dd4uXta4kVyO508=
 google.golang.org/appengine v1.4.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4=
 google.golang.org/appengine v1.5.0 h1:KxkO13IPW4Lslp2bz+KHP2E3gtFlrIGNThxkZQ3g+4c=
 google.golang.org/appengine v1.5.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4=
 google.golang.org/genproto v0.0.0-20180817151627-c66870c02cf8/go.mod h1:JiN7NxoALGmiZfu7CAH4rXhgtRTLTxftemlI0sWmxmc=
 google.golang.org/genproto v0.0.0-20190307195333-5fe7a883aa19/go.mod h1:VzzqZJRnGkLBvHegQrXjBqPurQTc5/KpmUdxsrq26oE=
-google.golang.org/genproto v0.0.0-20190418145605-e7d98fc518a7 h1:ZUjXAXmrAyrmmCPHgCA/vChHcpsX27MZ3yBonD/z1KE=
 google.golang.org/genproto v0.0.0-20190418145605-e7d98fc518a7/go.mod h1:VzzqZJRnGkLBvHegQrXjBqPurQTc5/KpmUdxsrq26oE=
 google.golang.org/genproto v0.0.0-20190502173448-54afdca5d873 h1:nfPFGzJkUDX6uBmpN/pSw7MbOAWegH5QDQuoXFHedLg=
 google.golang.org/genproto v0.0.0-20190502173448-54afdca5d873/go.mod h1:VzzqZJRnGkLBvHegQrXjBqPurQTc5/KpmUdxsrq26oE=
-google.golang.org/grpc v1.19.0 h1:cfg4PD8YEdSFnm7qLV4++93WcmhH2nIUhMjhdCvl3j8=
 google.golang.org/grpc v1.19.0/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c=
 google.golang.org/grpc v1.20.1 h1:Hz2g2wirWK7H0qIIhGIqRGTuMwTE8HEKFnDZZ7lm9NU=
 google.golang.org/grpc v1.20.1/go.mod h1:10oTOabMzJvdu6/UiuZezV6QK5dSlG84ov/aaiqXj38=

diff --git a/main.go b/main.go
@@ -45,6 +45,10 @@ func main() {
 		s.test()
 		return
 	}
+	if len(os.Args) > 1 && os.Args[1] == "testnacl" {
+		s.testNacl()
+		return
+	}
 
 	port := os.Getenv("PORT")
 	if port == "" {

diff --git a/sandbox.go b/sandbox.go
@@ -12,6 +12,7 @@ import (
 	"context"
 	"crypto/sha256"
 	"encoding/json"
+	"errors"
 	"fmt"
 	"go/ast"
 	"go/doc"
@@ -26,11 +27,12 @@ import (
 	"runtime"
 	"strconv"
 	"strings"
-	"syscall"
 	"text/template"
 	"time"
 
+	"cloud.google.com/go/compute/metadata"
 	"github.com/bradfitz/gomemcache/memcache"
+	"golang.org/x/playground/sandbox/sandboxtypes"
 )
 
 const (
@@ -79,7 +81,7 @@ type response struct {
 // If there is no cached *response for the combination of cachePrefix and request.Body,
 // handler calls cmdFunc and in case of a nil error, stores the value of *response in the cache.
 // The handler returned supports Cross-Origin Resource Sharing (CORS) from any domain.
-func (s *server) commandHandler(cachePrefix string, cmdFunc func(*request) (*response, error)) http.HandlerFunc {
+func (s *server) commandHandler(cachePrefix string, cmdFunc func(context.Context, *request) (*response, error)) http.HandlerFunc {
 	return func(w http.ResponseWriter, r *http.Request) {
 		cachePrefix := cachePrefix // so we can modify it below
 		w.Header().Set("Access-Control-Allow-Origin", "*")
@@ -110,7 +112,7 @@ func (s *server) commandHandler(cachePrefix string, cmdFunc func(*request) (*res
 			if err != memcache.ErrCacheMiss {
 				s.log.Errorf("s.cache.Get(%q, &response): %v", key, err)
 			}
-			resp, err = cmdFunc(&req)
+			resp, err = cmdFunc(r.Context(), &req)
 			if err != nil {
 				s.log.Errorf("cmdFunc error: %v", err)
 				http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
@@ -315,7 +317,7 @@ var failedTestPattern = "--- FAIL"
 // The output of successfully ran program is returned in *response.Events.
 // If a program cannot be built or has timed out,
 // *response.Errors contains an explanation for a user.
-func compileAndRun(req *request) (*response, error) {
+func compileAndRun(ctx context.Context, req *request) (*response, error) {
 	// TODO(andybons): Add semaphore to limit number of running programs at once.
 	tmpDir, err := ioutil.TempDir("", "sandbox")
 	if err != nil {
@@ -368,15 +370,34 @@ func compileAndRun(req *request) (*response, error) {
 		}
 	}
 
+	// TODO: remove all this once Go 1.14 is out. This is a transitional/debug step
+	// to support both nacl & gvisor temporarily.
+	useGvisor := os.Getenv("GO_VERSION") >= "go1.14" ||
+		os.Getenv("DEBUG_FORCE_GVISOR") == "1" ||
+		strings.Contains(req.Body, "//play:gvisor\n")
+
 	exe := filepath.Join(tmpDir, "a.out")
 	goCache := filepath.Join(tmpDir, "gocache")
 
-	ctx, cancel := context.WithTimeout(context.Background(), maxCompileTime)
+	buildCtx, cancel := context.WithTimeout(ctx, maxCompileTime)
 	defer cancel()
-	cmd := exec.CommandContext(ctx, "go", "build", "-o", exe, buildPkgArg)
+	goBin := "go"
+	if useGvisor {
+		goBin = "/usr/local/go1.14/bin/go"
+	}
+	cmd := exec.CommandContext(buildCtx, goBin,
+		"build",
+		"-o", exe,
+		"-tags=faketime", // required for Go 1.14+, no-op before
+		buildPkgArg)
 	cmd.Dir = tmpDir
 	var goPath string
-	cmd.Env = []string{"GOOS=nacl", "GOARCH=amd64p32", "GOCACHE=" + goCache}
+	if useGvisor {
+		cmd.Env = []string{"GOOS=linux", "GOARCH=amd64", "GOROOT=/usr/local/go1.14"}
+	} else {
+		cmd.Env = []string{"GOOS=nacl", "GOARCH=amd64p32"}
+	}
+	cmd.Env = append(cmd.Env, "GOCACHE="+goCache)
 	if useModules {
 		// Create a GOPATH just for modules to be downloaded
 		// into GOPATH/pkg/mod.
@@ -411,28 +432,62 @@ func compileAndRun(req *request) (*response, error) {
 		}
 		return nil, fmt.Errorf("error building go source: %v", err)
 	}
-	ctx, cancel = context.WithTimeout(context.Background(), maxRunTime)
+	runCtx, cancel := context.WithTimeout(ctx, maxRunTime)
 	defer cancel()
-	cmd = exec.CommandContext(ctx, "sel_ldr_x86_64", "-l", "/dev/null", "-S", "-e", exe, testParam)
 	rec := new(Recorder)
-	cmd.Stdout = rec.Stdout()
-	cmd.Stderr = rec.Stderr()
-	var status int
-	if err := cmd.Run(); err != nil {
-		if ctx.Err() == context.DeadlineExceeded {
-			// Send what was captured before the timeout.
-			events, err := rec.Events()
-			if err != nil {
-				return nil, fmt.Errorf("error decoding events: %v", err)
-			}
-			return &response{Errors: "process took too long", Events: events}, nil
+	var exitCode int
+	if useGvisor {
+		f, err := os.Open(exe)
+		if err != nil {
+			return nil, err
 		}
-		exitErr, ok := err.(*exec.ExitError)
-		if !ok {
-			return nil, fmt.Errorf("error running sandbox: %v", err)
+		defer f.Close()
+		req, err := http.NewRequestWithContext(ctx, "POST", sandboxBackendURL(), f)
+		if err != nil {
+			return nil, err
+		}
+		req.Header.Add("Idempotency-Key", "1") // lets Transport do retries with a POST
+		if testParam != "" {
+			req.Header.Add("X-Argument", testParam)
+		}
+		req.GetBody = func() (io.ReadCloser, error) { return os.Open(exe) }
+		res, err := http.DefaultClient.Do(req)
+		if err != nil {
+			return nil, err
 		}
-		if ws, ok := exitErr.Sys().(syscall.WaitStatus); ok {
-			status = ws.ExitStatus()
+		defer res.Body.Close()
+		if res.StatusCode != http.StatusOK {
+			return nil, fmt.Errorf("unexpected response from backend: %v", res.Status)
+		}
+		var execRes sandboxtypes.Response
+		if err := json.NewDecoder(res.Body).Decode(&execRes); err != nil {
+			log.Printf("JSON decode error from backend: %v", err)
+			return nil, errors.New("error parsing JSON from backend")
+		}
+		if execRes.Error != "" {
+			return &response{Errors: execRes.Error}, nil
+		}
+		exitCode = execRes.ExitCode
+		rec.Stdout().Write(execRes.Stdout)
+		rec.Stderr().Write(execRes.Stderr)
+	} else {
+		cmd := exec.CommandContext(runCtx, "sel_ldr_x86_64", "-l", "/dev/null", "-S", "-e", exe, testParam)
+		cmd.Stdout = rec.Stdout()
+		cmd.Stderr = rec.Stderr()
+		if err := cmd.Run(); err != nil {
+			if ctx.Err() == context.DeadlineExceeded {
+				// Send what was captured before the timeout.
+				events, err := rec.Events()
+				if err != nil {
+					return nil, fmt.Errorf("error decoding events: %v", err)
+				}
+				return &response{Errors: "process took too long", Events: events}, nil
+			}
+			exitErr, ok := err.(*exec.ExitError)
+			if !ok {
+				return nil, fmt.Errorf("error running sandbox: %v", err)
+			}
+			exitCode = exitErr.ExitCode()
 		}
 	}
 	events, err := rec.Events()
@@ -455,7 +510,7 @@ func compileAndRun(req *request) (*response, error) {
 	}
 	return &response{
 		Events:      events,
-		Status:      status,
+		Status:      exitCode,
 		IsTest:      testParam != "",
 		TestsFailed: fails,
 		VetErrors:   vetOut,
@@ -490,7 +545,8 @@ func playgroundGoproxy() string {
 }
 
 func (s *server) healthCheck() error {
-	resp, err := compileAndRun(&request{Body: healthProg})
+	ctx := context.Background() // TODO: cap it to some reasonable timeout
+	resp, err := compileAndRun(ctx, &request{Body: healthProg})
 	if err != nil {
 		return err
 	}
@@ -503,6 +559,18 @@ func (s *server) healthCheck() error {
 	return nil
 }
 
+func sandboxBackendURL() string {
+	if v := os.Getenv("SANDBOX_BACKEND_URL"); v != "" {
+		return v
+	}
+	id, _ := metadata.ProjectID()
+	switch id {
+	case "golang-org":
+		return "http://sandbox.play-sandbox-fwd.il4.us-central1.lb.golang-org.internal/run"
+	}
+	panic(fmt.Sprintf("no SANDBOX_BACKEND_URL environment and no default defined for project %q", id))
+}
+
 const healthProg = `
 package main
 

diff --git a/sandbox/.gitignore b/sandbox/.gitignore
@@ -0,0 +1 @@
+*.yaml.expanded
diff --git a/sandbox/Dockerfile b/sandbox/Dockerfile
@@ -0,0 +1,34 @@
+# This is the sandbox backend server.
+#
+# When it's run, the host maps in /var/run/docker.sock to this
+# environment so the play-sandbox server can connect to the host's
+# docker daemon, which has the gvisor "runsc" runtime available.
+
+FROM golang:1.13 AS build
+
+COPY . /go/src/playground
+WORKDIR /go/src/playground/sandbox
+RUN go install
+
+FROM debian:buster
+
+RUN apt-get update
+
+# Extra stuff for occasional debugging:
+RUN apt-get install --yes strace lsof emacs25-nox net-tools tcpdump procps
+
+# Install Docker CLI:
+RUN apt-get install --yes \
+        apt-transport-https \
+        ca-certificates \
+        curl \
+        gnupg2 \
+        software-properties-common
+RUN bash -c "curl -fsSL https://download.docker.com/linux/debian/gpg | apt-key add -"
+RUN add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/debian buster stable"
+RUN apt-get update
+RUN apt-get install --yes docker-ce-cli
+
+COPY --from=build /go/bin/sandbox /usr/local/bin/play-sandbox
+
+ENTRYPOINT ["/usr/local/bin/play-sandbox"]