5 files changed, 53 insertions, 12 deletions
diff --git a/runsc/boot/config.go b/runsc/boot/config.go
index 05b8f8761..31103367d 100644
--- a/runsc/boot/config.go
+++ b/runsc/boot/config.go
@@ -211,12 +211,6 @@ type Config struct {
 	// RestoreFile is the path to the saved container image
 	RestoreFile string
 
-	// TestOnlyAllowRunAsCurrentUserWithoutChroot should only be used in
-	// tests. It allows runsc to start the sandbox process as the current
-	// user, and without chrooting the sandbox process. This can be
-	// necessary in test environments that have limited capabilities.
-	TestOnlyAllowRunAsCurrentUserWithoutChroot bool
-
 	// NumNetworkChannels controls the number of AF_PACKET sockets that map
 	// to the same underlying network device. This allows netstack to better
 	// scale for high throughput use cases.
@@ -233,6 +227,19 @@ type Config struct {
 
 	// ReferenceLeakMode sets reference leak check mode
 	ReferenceLeakMode refs.LeakMode
+
+	// TestOnlyAllowRunAsCurrentUserWithoutChroot should only be used in
+	// tests. It allows runsc to start the sandbox process as the current
+	// user, and without chrooting the sandbox process. This can be
+	// necessary in test environments that have limited capabilities.
+	TestOnlyAllowRunAsCurrentUserWithoutChroot bool
+
+	// TestOnlyTestNameEnv should only be used in tests. It looks up for the
+	// test name in the container environment variables and adds it to the debug
+	// log file name. This is done to help identify the log with the test when
+	// multiple tests are run in parallel, since there is no way to pass
+	// parameters to the runtime from docker.
+	TestOnlyTestNameEnv string
 }
 
 // ToFlags returns a slice of flags that correspond to the given Config.
@@ -261,9 +268,12 @@ func (c *Config) ToFlags() []string {
 		"--alsologtostderr=" + strconv.FormatBool(c.AlsoLogToStderr),
 		"--ref-leak-mode=" + refsLeakModeToString(c.ReferenceLeakMode),
 	}
+	// Only include these if set since it is never to be used by users.
 	if c.TestOnlyAllowRunAsCurrentUserWithoutChroot {
-		// Only include if set since it is never to be used by users.
-		f = append(f, "-TESTONLY-unsafe-nonroot=true")
+		f = append(f, "--TESTONLY-unsafe-nonroot=true")
+	}
+	if len(c.TestOnlyTestNameEnv) != 0 {
+		f = append(f, "--TESTONLY-test-name-env="+c.TestOnlyTestNameEnv)
 	}
 	return f
 }
diff --git a/runsc/container/container.go b/runsc/container/container.go
index 00f1b1de9..a721c1c31 100644
--- a/runsc/container/container.go
+++ b/runsc/container/container.go
@@ -946,7 +946,14 @@ func (c *Container) createGoferProcess(spec *specs.Spec, conf *boot.Config, bund
 	}
 
 	if conf.DebugLog != "" {
-		debugLogFile, err := specutils.DebugLogFile(conf.DebugLog, "gofer")
+		test := ""
+		if len(conf.TestOnlyTestNameEnv) != 0 {
+			// Fetch test name if one is provided and the test only flag was set.
+			if t, ok := specutils.EnvVar(spec.Process.Env, conf.TestOnlyTestNameEnv); ok {
+				test = t
+			}
+		}
+		debugLogFile, err := specutils.DebugLogFile(conf.DebugLog, "gofer", test)
 		if err != nil {
 			return nil, nil, fmt.Errorf("opening debug log file in %q: %v", conf.DebugLog, err)
 		}
diff --git a/runsc/main.go b/runsc/main.go
index 0ff68160d..ff74c0a3d 100644
--- a/runsc/main.go
+++ b/runsc/main.go
@@ -79,6 +79,7 @@ var (
 
 	// Test flags, not to be used outside tests, ever.
 	testOnlyAllowRunAsCurrentUserWithoutChroot = flag.Bool("TESTONLY-unsafe-nonroot", false, "TEST ONLY; do not ever use! This skips many security measures that isolate the host from the sandbox.")
+	testOnlyTestNameEnv                        = flag.String("TESTONLY-test-name-env", "", "TEST ONLY; do not ever use! Used for automated tests to improve logging.")
 )
 
 func main() {
@@ -211,6 +212,7 @@ func main() {
 		ReferenceLeakMode:  refsLeakMode,
 
 		TestOnlyAllowRunAsCurrentUserWithoutChroot: *testOnlyAllowRunAsCurrentUserWithoutChroot,
+		TestOnlyTestNameEnv:                        *testOnlyTestNameEnv,
 	}
 	if len(*straceSyscalls) != 0 {
 		conf.StraceSyscalls = strings.Split(*straceSyscalls, ",")
@@ -244,7 +246,7 @@ func main() {
 		e = newEmitter(*debugLogFormat, f)
 
 	} else if *debugLog != "" {
-		f, err := specutils.DebugLogFile(*debugLog, subcommand)
+		f, err := specutils.DebugLogFile(*debugLog, subcommand, "" /* name */)
 		if err != nil {
 			cmd.Fatalf("error opening debug log file in %q: %v", *debugLog, err)
 		}
diff --git a/runsc/sandbox/sandbox.go b/runsc/sandbox/sandbox.go
index df3c0c5ef..4c6c83fbd 100644
--- a/runsc/sandbox/sandbox.go
+++ b/runsc/sandbox/sandbox.go
@@ -351,7 +351,15 @@ func (s *Sandbox) createSandboxProcess(conf *boot.Config, args *Args, startSyncF
 		nextFD++
 	}
 	if conf.DebugLog != "" {
-		debugLogFile, err := specutils.DebugLogFile(conf.DebugLog, "boot")
+		test := ""
+		if len(conf.TestOnlyTestNameEnv) == 0 {
+			// Fetch test name if one is provided and the test only flag was set.
+			if t, ok := specutils.EnvVar(args.Spec.Process.Env, conf.TestOnlyTestNameEnv); ok {
+				test = t
+			}
+		}
+
+		debugLogFile, err := specutils.DebugLogFile(conf.DebugLog, "boot", test)
 		if err != nil {
 			return fmt.Errorf("opening debug log file in %q: %v", conf.DebugLog, err)
 		}
diff --git a/runsc/specutils/specutils.go b/runsc/specutils/specutils.go
index df435f88d..cb9e58dfb 100644
--- a/runsc/specutils/specutils.go
+++ b/runsc/specutils/specutils.go
@@ -399,13 +399,15 @@ func WaitForReady(pid int, timeout time.Duration, ready func() (bool, error)) er
 //   - %TIMESTAMP%: is replaced with a timestamp using the following format:
 //			<yyyymmdd-hhmmss.uuuuuu>
 //	 - %COMMAND%: is replaced with 'command'
-func DebugLogFile(logPattern, command string) (*os.File, error) {
+//	 - %TEST%: is replaced with 'test' (omitted by default)
+func DebugLogFile(logPattern, command, test string) (*os.File, error) {
 	if strings.HasSuffix(logPattern, "/") {
 		// Default format: <debug-log>/runsc.log.<yyyymmdd-hhmmss.uuuuuu>.<command>
 		logPattern += "runsc.log.%TIMESTAMP%.%COMMAND%"
 	}
 	logPattern = strings.Replace(logPattern, "%TIMESTAMP%", time.Now().Format("20060102-150405.000000"), -1)
 	logPattern = strings.Replace(logPattern, "%COMMAND%", command, -1)
+	logPattern = strings.Replace(logPattern, "%TEST%", test, -1)
 
 	dir := filepath.Dir(logPattern)
 	if err := os.MkdirAll(dir, 0775); err != nil {
@@ -542,3 +544,15 @@ func GetParentPid(pid int) (int, error) {
 
 	return ppid, nil
 }
+
+// EnvVar looks for a varible value in the env slice assuming the following
+// format: "NAME=VALUE".
+func EnvVar(env []string, name string) (string, bool) {
+	prefix := name + "="
+	for _, e := range env {
+		if strings.HasPrefix(e, prefix) {
+			return strings.TrimPrefix(e, prefix), true
+		}
+	}
+	return "", false
+}