OS X 启动d.plist

Question

这是我的 plist 文件

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC -//Apple Computer//DTD PLIST 1.0//EN http://www.apple.com/DTDs/PropertyList-1.0.dtd >
<plist version="1.0">
<dict>
  <key>Label</key>
  <string>com.homebrew.autoupdate</string>
  <key>ProgramArguments</key>
  <array>
    <string>/usr/local/bin/brew_up</string>
  </array>
  <key>StartInterval</key>
  <integer>86400</integer>
  <key>StandardErrorPath</key>
  <string>/usr/local/var/log/brew.log</string>
  <key>StandardOutPath</key>
  <string>/usr/local/var/log/brew.log</string>
</dict>
</plist>

/usr/local/bin/brew_up 只是一个调用brew update、brew upgrade 等的脚本

#!/bin/sh
echo `date`: Start updating brew
/usr/local/bin/brew update && /usr/local/bin/brew upgrade && /usr/local/bin/brew cleanup
echo `date`: Finish updating brew

然后我通过launchctl load ~/Library/LaunchAgents/homebrew.autoupdate.plist加载了那个文件

然后我尝试了launchctl start com.homebrew.autoupdate，它也很好用。

但问题是，它不会像我预期的那样每 24 小时启动一次。实际上现在已经过去了48小时，甚至一次都没有开始。我在这里错过了什么？

然后我把StartInterval改成了StartCalendarInterval

  <key>StartCalendarInterval</key>
  <dict>
    <key>Hour</key>
    <integer>21</integer>
  </dict>

然后无限期启动，日志文件如下：

Thu Aug 7 21:17:20 CST 2014: Finish updating brew
Thu Aug 7 21:17:20 CST 2014: Start updating brew
Already up-to-date.
Thu Aug 7 21:18:14 CST 2014: Finish updating brew
Thu Aug 7 21:18:14 CST 2014: Start updating brew
Already up-to-date.
Thu Aug 7 21:19:39 CST 2014: Finish updating brew
Thu Aug 7 21:19:39 CST 2014: Start updating brew
Already up-to-date.
Thu Aug 7 21:22:28 CST 2014: Finish updating brew
Thu Aug 7 21:22:28 CST 2014: Start updating brew
Already up-to-date.
Thu Aug 7 21:24:46 CST 2014: Finish updating brew

更新：我认为这意味着 * 21 * * * 就像在 crontab 中一样，所以如果是的话

      <key>StartCalendarInterval</key>
      <dict>
        <key>Hour</key>
        <integer>21</integer>
        <key>Minute</key>
        <integer>0</integer>
      </dict>

它应该可以工作。

但是，StartInterval 有什么问题？

顺便说一句，我只是尝试编写一个简单的演示来测试StartInterval，它完全有效！

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC -//Apple Computer//DTD PLIST 1.0//EN http://www.apple.com/DTDs/PropertyList-1.0.dtd >
<plist version="1.0">
<dict>
  <key>Label</key>
  <string>com.test.touch</string>
  <key>ProgramArguments</key>
  <array>
    <string>touch</string>
    <string>/tmp/touched.txt</string>
  </array>
  <key>StartInterval</key>
  <integer>60</integer>
</dict>
</plist>

Answer 1

对于Scheduled Timed Jobs，您应该使用密钥StartCalendarInterval (Reference)

<key>StartCalendarInterval</key>
<dict>
    <key>Hour</key>
    <integer>11</integer>
</dict>

Answer 2

launchd 开发人员文档中的某处隐藏了一条注释，警告说按需服务需要保留一段时间。 （类似于 10 秒 IIRC。）否则，launched 会认为它们无法正常启动并尝试重新启动它们。

尝试将sleep 30 添加到您的shell 脚本中，看看是否能解决它不断重启的问题。