fix(init): removed unnecessary error message when waiting for child process; race with wait all

fix(exec): fallback to os.Args when no delimiter found
fix(pidproxy): fallback to os.Args when no delimiter found
fix(splitargs): return full selfArgs
fix(experiment/starter): replaced bool no-wait with count
test(docker/bookworm-newconfig): added test for background process + pid proxy

config/util.go

@@ -1,6 +1,8 @@
 package config
 
 import (
+	"fmt"
+	"io"
 	"os/exec"
 	"strings"
 )
@@ -10,14 +12,26 @@ func getVersion(binPath string) (string, error) {
 		outBytes []byte
 		err      error
 		output   string
+		stdout   io.ReadCloser
+		n        int
 	)
 	cmd := exec.Command(binPath, "version")
-	outBytes, err = cmd.Output()
-	if err != nil {
-		return "", err
+	if stdout, err = cmd.StdoutPipe(); err != nil {
+		return "", fmt.Errorf("setting up stdout reader: %w", err)
 	}
 
-	output = string(outBytes)
+	if err = cmd.Start(); err != nil {
+		return "", fmt.Errorf("starting process: %w", err)
+	}
+
+	outBytes = make([]byte, 1024)
+	if n, err = stdout.Read(outBytes); err != nil {
+		return "", fmt.Errorf("reading stdout: %w", err)
+	}
+
+	_ = cmd.Wait()
+
+	output = string(outBytes[:n])
 	output = strings.TrimRight(output, versionTrimRightCutSet)
 	return output, nil
 }