使用带有单引号，空格，管道等的scala sys.process [英] Using scala sys.process with single quotes, white-space, pipes etc

问题描述

我尝试使用scala.sys.process._向我的 chronos 提交POST请求。 a>服务器与curl。因为命令的参数中有空格，所以我使用 cmd的 Seq [String] 变体!!

I am trying to use scala.sys.process._ to submit a POST request to my chronos server with curl. Because there is white space in the command's arguments, I am using the Seq[String] variant of cmd.!!

我正在建立这样的命令：

I am building the command like so:

val cmd = Seq("curl", "-L", "-X POST", "-H 'Content-Type: application/json'", "-d " + jsonHash,  args.chronosHost + "/scheduler/" + jobType)

会按预期产生

cmd: Seq[String] = List(curl, -L, -X POST, -H 'Content-Type: application/json', -d '{"schedule":"R/2014-02-02T00:00:00Z/PT24H", "name":"Scala-Post-Test", "command":"which scalac", "epsilon":"PT15M", "owner":"[e-mail]", "async":false}', localhost:4040/scheduler/iso8601)

，运行这看起来像是修改'Content-Type：application / json'参数：

however, running this appears to mangle the 'Content-Type: application/json' argument:

scala> cmd.!!
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100   264    0   100  100   164   2157   3538 --:--:-- --:--:-- --:--:-- 54666
res21: String =
"The HTTP header field "Accept" with value "*/* 'Content-Type:application/json'" could not be parsed.
"

相比之下，调用 cmd.mkString（）并将+粘贴复制到终端可以正常工作。

which I don't understand. By contrast, calling cmd.mkString(" ") and copy+pasting into the terminal works as expected.

curl -L -X POST -H 'Content-Type:application/json' -d '{"schedule":"R/2014-02-02T00:00:00Z/PT24H", "name":"Scala-Post-Test", "command":"which scalac", "epsilon":"PT15M", "owner":"[e-mail]", "async":false}' mapr-01.dev.quantifind.com:4040/scheduler/iso8601

H参数无效，任何洞察使用单引号在sys.process ._'s！非常感谢。

I have tried numerous variations on the -H argument to no avail, any insight into using single quotes in sys.process._'s !! would be greatly appreciated.

我已经尝试过这种变化，产生一系列的错误，包括

I have tried variations on this as well, which generates a slew of errors, including

<h2>HTTP ERROR: 415</h2>
<p>Problem accessing /scheduler/iso8601. Reason:
<pre>    Unsupported Media Type</pre></p>
<hr /><i><small>Powered by Jetty://</small></i>

（除了宰杀jsonHash之外，即：

(in addition to butchering the jsonHash, ie:

[1/6]: '"schedule":"R/2014-02-02T00:00:00Z/PT24H"' --> <stdout>

curl: (6) Couldn't resolve host ''"schedule"'

Which makes me think it is not interpreting the -H argument correctly

推荐答案

您需要将每个参数分成一个序列的单独元素。

You need to split each argument into a separate element of a sequence.

而不是这样：

val cmd = Seq("curl", "-L", "-X POST", "-H 'Content-Type: application/json'", "-d " + jsonHash,  args.chronosHost + "/scheduler/" + jobType)

您需要写下：

val cmd = Seq("curl", "-L", "-X", "POST", "-H", "'Content-Type: application/json'", "-d " + jsonHash,  args.chronosHost + "/scheduler/" + jobType)

将序列的每个元素作为参数因此 - H'Content-Type ... 看起来像 curl 的一个参数应为2。

It puts each element of a sequence as an argument on a command line. So "-H 'Content-Type... looks like a single argument to curl while it should be 2.

这里是一个简单的测试方法：

Here is a simple way to test:

import scala.sys.process._
val cmd = Seq("find", "/dev/null", "-name", "null") // works
// does not work: val cmd = Seq("find", "/dev/null", "-name null")
val res = cmd.!!
println(res)

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