java - ProcessBuilder 抛出异常 : Arguement contains =

Question

我正在尝试使用 java 在 Linux 上为 raid 驱动器创建文件系统。

当我尝试使用 ProcessBuilder 执行以下命令时遇到以下问题。

Process '[/usr/bin/sudo, /sbin/mkfs.ext4, /dev/md0, -m 1, -O uninit_bg, -E lazy_itable_init=1]' stderr dump: mke2fs 1.42.3 (14-May-2012)

Bad option(s) specified: lazy_ _init

Extended options are separated by commas, and may take an argument which is set off by an equals ('=') sign.

Valid extended options are: stride= stripe-width= resize= lazy_itable_init=<0 to disable, 1 to enable> lazy_journal_init=<0 to disable, 1 to enable> test_fs discard nodiscard quotatype=

我的 ProcessBuilder 对象看起来像这样

mkfs("ext4", "/dev/md0", "-m 1", "-O uninit_bg", "-E lazy_itable_init=1")

public void mkfs(String filesystem, String devicename, String... options) {
mkfsCommand.add(SUDO_CMD);
if(fileSystemType.equals("xfs")){
            mkfsCommand.add("/sbin/mkfs.xfs");
        } else if (fileSystemType.equals("ext4")) {
            mkfsCommand.add("/sbin/mkfs.ext4");
        }

        mkfsCommand.add(deviceName);
        for (String option:options) {
            mkfsCommand.add(option);
        }
List<String> mkfsCommand = Lists.newLinkedList();
Exec.exec(ProcessBuilder(mkfsCommand))
}

Exec.exec 是我用来执行系统命令的库。我无法更改它，但这是它的作用的片段。

public String exec(ProcessBuilder pb) {
    String cmdString = Arrays.deepToString(pb.command().toArray(new String[0]));
        int retval = 0;
        Process p = null;
        String output = "";
        if(shouldLog) {
            logger.debug("in exec: " + cmdString);
        }
        String error = null;
        try {
            p = pb.start();
            if (executionDeadline != null) {
                Thread durationEnforcer = new DurationEnforcer(executionDeadline, p);
                durationEnforcer.start();
            }
            Future<String> futureErr = null;
            if (!pb.redirectErrorStream()) {
                futureErr = SingleExecutor.submit(new StreamReader(p.getErrorStream()));
            }
            StreamReader outputReader = new StreamReader(p.getInputStream());
            p.getOutputStream().close();
            output = outputReader.call();
            retval = p.waitFor();

            if (futureErr != null) {
                error = futureErr.get();
            }
            if (error != null && !error.isEmpty()) {
                if(shouldLog) {
                    logger.warn("Process '" + cmdString + "' stderr dump:\n" + error);
                }
            }
            this.stdOutput = output;
            this.stdError = error;
        } catch (Exception e) {
            logger.warn("exec failed: " + e + "\nstdout:\n" + output);
            throw new RuntimeException("exec failed: ", e);
        } finally {
            StreamHelper.closeStreamsAndDestroy(p);
        }
        if (retval != 0) {
            String msg = "exec failed with " + retval + ": " + cmdString;
            if(shouldLog) {
                logger.warn(msg + "\nstdout:\n" + output);
            }
            throw new ExecException(error, cmdString, retval, output);
        }
        if(shouldLog) {
            logger.debug("finished exec: " + cmdString);
        }

        return output;
    }
}

我不确定为什么会收到此错误。我怀疑 -E lazy_itable_init=1 没有正确传递给 Processbuilder。对发生的事情有什么想法吗？

Answer 1

我怀疑这是你的命令String....

"ext4", "/dev/md0", "-m 1", "-O uninit_bg", "-E lazy_itable_init=1"

这基本上是对 ext4 说，你有 4 个参数......

• /dev/md0
• -m 1
• -O uninit_bg
• -Elazy_itable_init=1

当我怀疑它实际上想要 7 时。

• /dev/md0
• -m
• 1
• -O
• uninit_bg
• -E
• lazy_itable_init=1

或者类似...

相反，尝试使用诸如...之类的东西

"ext4", "/dev/md0", "-m", "1", "-O", "uninit_bg", "-E", "lazy_itable_init=1" 

您传递的 ProcessBuilder 的每个 String 元素都将被视为命令的单独参数(例如，每个参数在命令行上用空格分隔)。

这使得 ProcessBuilder 非常强大，因为它可以处理实际上包含空格的命令参数，而无需担心转义引号:P