add some info logging about container startup

4 files changed, 41 insertions, 31 deletions

diff --git a/client/go/jvm/container.go b/client/go/jvm/container.go
index ac10f775859..384384da137 100644
--- a/client/go/jvm/container.go
+++ b/client/go/jvm/container.go
@@ -4,7 +4,11 @@
 package jvm
 
 import (
+	"fmt"
+	"strings"
+
 	"github.com/vespa-engine/vespa/client/go/prog"
+	"github.com/vespa-engine/vespa/client/go/trace"
 	"github.com/vespa-engine/vespa/client/go/util"
 )
 
@@ -34,6 +38,14 @@ func (cb *containerBase) ConfigId() string {
 	return cb.configId
 }
 
+func readableEnv(env map[string]string) string {
+	var buf strings.Builder
+	for k, v := range env {
+		fmt.Fprintf(&buf, " %s=%s", k, v)
+	}
+	return buf.String()
+}
+
 func (cb *containerBase) Exec() {
 	argv := make([]string, 0, 100)
 	argv = append(argv, "java")
@@ -42,7 +54,9 @@ func (cb *containerBase) Exec() {
 	}
 	p := prog.NewSpec(argv)
 	p.ConfigureNumaCtl()
-	exportEnvSettings(cb, p)
+	cb.exportEnvSettings(p)
+	trace.Info("starting container; env:", readableEnv(p.Env))
+	trace.Info("starting container; exec:", argv)
 	err := p.Run()
 	util.JustExitWith(err)
 }
diff --git a/client/go/jvm/env.go b/client/go/jvm/env.go
index 5157847fb86..3db0cfd17b4 100644
--- a/client/go/jvm/env.go
+++ b/client/go/jvm/env.go
@@ -26,7 +26,7 @@ const (
 	MALLOC_ARENA_MAX   = util.ENV_MALLOC_ARENA_MAX
 )
 
-func exportEnvSettings(c *containerBase, ps *prog.Spec) {
+func (c *containerBase) exportEnvSettings(ps *prog.Spec) {
 	vespaHome := defaults.VespaHome()
 	vlt := fmt.Sprintf("file:%s/logs/vespa/vespa.log", vespaHome)
 	lcd := fmt.Sprintf("%s/var/db/vespa/logcontrol", vespaHome)
diff --git a/client/go/prog/spec_env.go b/client/go/prog/spec_env.go
index 498931fe92c..ffdafe7676b 100644
--- a/client/go/prog/spec_env.go
+++ b/client/go/prog/spec_env.go
@@ -22,31 +22,30 @@ func (p *Spec) Getenv(k string) string {
 }
 
 func (spec *Spec) effectiveEnv() []string {
-	env := make(map[string]string)
-	for _, entry := range os.Environ() {
-		addInMap := func(kv string) bool {
-			for idx, elem := range kv {
-				if elem == '=' {
-					k := kv[:idx]
-					env[k] = kv
-					return true
-				}
+	envMap := make(map[string]string)
+	addToMap := func(kv string) {
+		for idx, elem := range kv {
+			if elem == '=' {
+				k := kv[:idx]
+				envMap[k] = kv
+				return
 			}
-			return false
-		}
-		if !addInMap(entry) {
-			env[entry] = ""
 		}
+		trace.Trace("invalid entry in os.Environ():", kv)
+		envMap[kv] = kv
+	}
+	for _, entry := range os.Environ() {
+		addToMap(entry)
 	}
 	for k, v := range spec.Env {
 		trace.Trace("add to environment:", k, "=", v)
-		env[k] = k + "=" + v
+		envMap[k] = k + "=" + v
 	}
-	envv := make([]string, 0, len(env))
-	for _, v := range env {
-		envv = append(envv, v)
+	envVec := make([]string, 0, len(envMap))
+	for _, val := range envMap {
+		envVec = append(envVec, val)
 	}
-	return envv
+	return envVec
 }
 
 func (spec *Spec) considerFallback(varName, varValue string) {
diff --git a/client/go/trace/trace.go b/client/go/trace/trace.go
index cedd1bcf597..9f642b79562 100644
--- a/client/go/trace/trace.go
+++ b/client/go/trace/trace.go
@@ -31,30 +31,27 @@ func Silent() {
 	currentOutputLevel = levelNone
 }
 
-func outputStderr(l outputLevel, n string, v ...interface{}) {
+func outputTracing(l outputLevel, n string, v ...interface{}) {
 	if l > currentOutputLevel {
 		return
 	}
-	w := make([]interface{}, len(v)+1)
-	w[0] = n
-	for idx, arg := range v {
-		w[idx+1] = arg
-	}
-	fmt.Fprintln(os.Stderr, w...)
+	out := os.Stderr
+	fmt.Fprintf(out, "%s\t", n)
+	fmt.Fprintln(out, v...)
 }
 
 func Info(v ...interface{}) {
-	outputStderr(levelInfo, "[info]", v...)
+	outputTracing(levelInfo, "info", v...)
 }
 
 func Trace(v ...interface{}) {
-	outputStderr(levelTrace, "[trace]", v...)
+	outputTracing(levelTrace, "info", v...)
 }
 
 func Debug(v ...interface{}) {
-	outputStderr(levelDebug, "[debug]", v...)
+	outputTracing(levelDebug, "debug", v...)
 }
 
 func Warning(v ...interface{}) {
-	outputStderr(levelWarning, "[warning]", v...)
+	outputTracing(levelWarning, "warning", v...)
 }