blocks|key|1580454|text|最简单的方法是将true附加到命令的末尾。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1580455|++task+:my_task+do
++++run+"my_command"
++end|code-block|syntax|javascript|1580456|变成了|1580457|++task+:my_task+do
++++run+"my_command;+true"
++end|1580458|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

The simplest way is to just append true to the end of your command.

<pre><code> task :my_task do
 run "my_command"
 end
</code></pre>

Becomes

<pre><code> task :my_task do
 run "my_command; true"
 end
</code></pre>

blocks|key|1365483|text|对于Capistrano+3，您可以(按照建议的here)使用以下内容：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1365484|execute+"some_command.sh",+raise_on_non_zero_exit:+false|code-block|syntax|javascript|1365485|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/capistrano/capistrano/issues/731#issuecomment-26917682^0|O|4|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

For Capistrano 3, you can (as suggested <a href="https://github.com/capistrano/capistrano/issues/731#issuecomment-26917682">here</a>) use the following: 

<pre><code>execute "some_command.sh", raise_on_non_zero_exit: false
</code></pre>

blocks|key|1365306|text|%2Bgrep%2B命令根据它找到的结果退出非零值。在您关心输出但不关心它是否为空的用例中，您将静默地放弃退出状态：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1365307|run+%25Q{bash+-c+'grep+#{escaped_grep_command_args}+;+true'+}|code-block|syntax|javascript|1365308|通常，我认为第一种解决方案很好--我会让它自己文档化：|1365309|cmd+=+"my_command+with_args+escaped_correctly"
run+%25Q{bash+-c+'#{cmd}+%7C%7C+echo+"Failed:+[#{cmd}]+--+ignoring."'}|1365310|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

The +grep+ command exits non-zero based on what it finds. In the use case where you care about the output but don't mind if it's empty, you'll discard the exit state silently:

<pre><code>run %Q{bash -c 'grep #{escaped_grep_command_args} ; true' }
</code></pre>

Normally, I think the first solution is just fine -- I'd make it document itself tho:

<pre><code>cmd = "my_command with_args escaped_correctly"
run %Q{bash -c '#{cmd} || echo "Failed: [#{cmd}] -- ignoring."'}
</code></pre>

blocks|key|1365186|text|如果想让Capistrano代码用退出代码做不同的事情，就需要对它打补丁；如果退出状态不为零，它会被硬编码为引发异常。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1365187|下面是lib/capistrano/command.rb的相关部分。以if+(failed开头的行...才是最重要的。基本上，它说如果有任何非零的返回值，抛出一个错误。|offset|length|style|CODE|1365188|#+Processes+the+command+in+parallel+on+all+specified+hosts.+If+the+command
#+fails+(non-zero+return+code)+on+any+of+the+hosts,+this+will+raise+a
#+Capistrano::CommandError.
def+process!
++loop+do
++++break+unless+process_iteration+{+@channels.any?+{+%7Cch%7C+!ch[:closed]+}+}
++end

++logger.trace+"command+finished"+if+logger

++if+(failed+=+@channels.select+{+%7Cch%7C+ch[:status]+!=+0+}).any?
++++commands+=+failed.inject({})+{+%7Cmap,+ch%7C+(map[ch[:command]]+%7C%7C=+[])+<<+ch[:server];+map+}
++++message+=+commands.map+{+%7Ccommand,+list%7C+"#{command.inspect}+on+#{list.join(',')}"+}.join(";+")
++++error+=+CommandError.new("failed:+#{message}")
++++error.hosts+=+commands.values.flatten
++++raise+error
++end

++self
end|code-block|syntax|javascript|1365189|entityMap^0|0|Z|A|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@$D|Q|E|R|F|G]]|9|@]|A|$]]|$1|H|3|I|5|J|7|S|8|@]|9|@]|A|$K|L]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

You'll need to patch the Capistrano code if you want it to do different things with the exit codes; it's hard-coded to raise an exception if the exit status is not zero.

Here's the relevant portion of lib/capistrano/command.rb. The line that starts with <code>if (failed</code>... is the important one. Basically it says if there are any nonzero return values, raise an error.

<pre><code># Processes the command in parallel on all specified hosts. If the command
# fails (non-zero return code) on any of the hosts, this will raise a
# Capistrano::CommandError.
def process!
 loop do
 break unless process_iteration { @channels.any? { |ch| !ch[:closed] } }
 end

 logger.trace "command finished" if logger

 if (failed = @channels.select { |ch| ch[:status] != 0 }).any?
 commands = failed.inject({}) { |map, ch| (map[ch[:command]] ||= []) &lt;&lt; ch[:server]; map }
 message = commands.map { |command, list| "#{command.inspect} on #{list.join(',')}" }.join("; ")
 error = CommandError.new("failed: #{message}")
 error.hosts = commands.values.flatten
 raise error
 end

 self
end
</code></pre>

blocks|key|1580546|text|我找到了最简单的方法：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1580547|run+"my_command+%7C%7C+:"|code-block|syntax|javascript|1580548|注意：:是NOP命令，因此退出代码将被忽略。|offset|length|style|CODE|1580549|entityMap^0|0|0|3|1|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@$I|R|J|S|K|L]]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

I find the easiest option to do this:

<pre><code>run "my_command || :"
</code></pre>

Notice: <code>:</code> is the NOP command so the exit code will simply be ignored.

blocks|key|1580340|text|我只是将STDERR和STDOUT重定向到/dev/null，所以您的|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1580341|run+"my_command"|code-block|syntax|javascript|1580342|变成了|1580343|run+"my_command+>+/dev/null+2>+/dev/null"|1580344|这对于标准的unix工具非常有效，例如，cp或ln可能会失败，但您不希望在这种失败时停止部署。|1580345|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

I just redirect STDERR and STDOUT to /dev/null, so your

<pre><code>run "my_command"
</code></pre>

becomes

<pre><code>run "my_command &gt; /dev/null 2&gt; /dev/null"
</code></pre>

this works for standard unix tools pretty well, where, say, cp or ln could fail, but you don't want to halt deployment on such a failure.

blocks|key|1365565|text|我不确定他们添加此代码的版本，但我喜欢使用raise_on_non_zero_exit来处理此问题|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1365566|namespace+:invoke+do
++task+:cleanup_workspace+do
++++on+release_roles(:app),+in:+:parallel+do
++++++execute+'sudo+/etc/cron.daily/cleanup_workspace',+raise_on_non_zero_exit:+false
++++end
++end
end|code-block|syntax|javascript|1365567|这就是这个特性在gem中实现的地方。https://github.com/capistrano/sshkit/blob/4cfddde6a643520986ed0f66f21d1357e0cd458b/lib/sshkit/command.rb#L94|1365568|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/capistrano/sshkit/blob/4cfddde6a643520986ed0f66f21d1357e0cd458b/lib/sshkit/command.rb#L94^0|L|M|0|0|I|30|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@$9|V|A|W|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|X|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|Y|8|@]|D|@$9|Z|A|10|1|11]]|E|$]]|$1|M|3|-4|5|6|7|12|8|@]|D|@]|E|$]]]|N|$O|$5|P|Q|R|E|$S|T]]]]

I not sure what version they added this code but I like handling this problem by using <code>raise_on_non_zero_exit</code>

<pre><code>namespace :invoke do
 task :cleanup_workspace do
 on release_roles(:app), in: :parallel do
 execute 'sudo /etc/cron.daily/cleanup_workspace', raise_on_non_zero_exit: false
 end
 end
end
</code></pre>

Here is where that feature is implemented in the gem. 
<a href="https://github.com/capistrano/sshkit/blob/4cfddde6a643520986ed0f66f21d1357e0cd458b/lib/sshkit/command.rb#L94" rel="nofollow noreferrer">https://github.com/capistrano/sshkit/blob/4cfddde6a643520986ed0f66f21d1357e0cd458b/lib/sshkit/command.rb#L94</a>

I'm using Capistrano run a remote task. My task looks like this:

<pre><code>task :my_task do
 run "my_command"
end
</code></pre>

My problem is that if <code>my_command</code> has an exit status != 0, then Capistrano considers it failed and exits. How can I make capistrano keep going when exit when the exit status is not 0? I've changed <code>my_command</code> to <code>my_command;echo</code> and it works but it feels like a hack.

Capistrano & Bash: ignore command exit status

我正在使用Capistrano运行一个远程任务。我的任务看起来像这样：task :my_task do  run "my_command"end我的问题是，如果my_command的退出状态为!= 0，则Capistrano认为它失败并退出。当退出状态不为0时，如何让capistrano继续运行？我已经把my_command改成了my_command;echo，而且还行得通，但感觉就像是个黑客。

问Capistrano & Bash:忽略命令退出状态
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回答 7

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