func()

in google_guest_agent/ps/ps_linux.go [47:116]
57 lines of code
13 McCabe index (conditional complexity)

func (p LinuxClient) Find(exeMatch string) ([]Process, error) {
	var result []Process

	procExpression, err := regexp.Compile("^[0-9]*$")
	if err != nil {
		return nil, fmt.Errorf("failed to compile process dir expression: %+v", err)
	}

	exeExpression, err := regexp.Compile(exeMatch)
	if err != nil {
		return nil, fmt.Errorf("failed to compile process exec matching expression: %+v", err)
	}

	files, err := os.ReadDir(linuxProcDir)
	if err != nil {
		return nil, fmt.Errorf("failed to read linux proc dir: %+v", err)
	}

	for _, file := range files {
		if !file.IsDir() {
			continue
		}

		if !procExpression.MatchString(file.Name()) {
			continue
		}

		processRootDir := path.Join(linuxProcDir, file.Name())
		exeLinkPath := path.Join(processRootDir, "exe")

		exePath, err := os.Readlink(exeLinkPath)
		if err != nil {
			continue
		}

		if !exeExpression.MatchString(exePath) {
			continue
		}

		cmdlinePath := path.Join(processRootDir, "cmdline")
		dat, err := os.ReadFile(cmdlinePath)
		if err != nil {
			return nil, fmt.Errorf("error reading cmdline file: %v", err)
		}

		var commandLine []string
		var token []byte
		for _, curr := range dat {
			if curr == 0 {
				commandLine = append(commandLine, string(token))
				token = nil
			} else {
				token = append(token, curr)
			}
		}

		pid, err := strconv.Atoi(file.Name())
		if err != nil {
			return nil, fmt.Errorf("error parsing PID: %v", err)
		}

		result = append(result, Process{
			Pid:         pid,
			Exe:         exePath,
			CommandLine: commandLine,
		})
	}

	return result, nil
}