Jenkins Pipeline - loop over multi string variable with groovy

John

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Apr 4, 2018, 5:46:15 PM4/4/18

to Jenkins Users

I'm trying to loop over a var that contains multiple strings (file paths), and then run a shell script against each one. But for some reason everything i try loops over every single letter of the string. Here is my code:

def call(Map config) {

  node('terraform-slave') {
    cleanWs()
    checkout scm

    stage('Plan') {
      commitChangeset = sh(returnStdout: true, script: 'git diff-tree --no-commit-id --name-only -r HEAD').trim()
    }
    stage('EchoToVerify') {
      tfvars = commitChangeset.replaceAll("terraform.tfvars", "")
      echo tfvars
    }
    stage('Loop') {
      loop(tfvars)
    }
  }
}

def loop(list) {
  list.each {
    sh "(cd ${it}; cat terraform.tfvars)"
  }
}

If you see the EchoToVerify stage, that works fine. Multiple file paths are echo'ed, like so:

/file/to/dir1

/file/to/dir2

/file/to/dir3

But when the Loop starts, it loops against each letter.. f, i, l, e, etc....

The only way I have been able to get it work is is by doing this:

def loop(list) {
  for (dir in [list]) {
    sh "(cd ${it}; cat terraform.tfvars)"
  }
}

However it only works when there is one value in the variable. It seems to want to iterate over ${it} immediately, before going to the next shell command (cat terraform.tfvars). It seems like it tries to "cd" to the next directory immediately.

Thanks for the help!

Viacheslav Dubrovskyi

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Apr 25, 2018, 10:31:14 AM4/25/18

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Hi

commitChangeset = sh( ... ).trim() will return string. You should transform it to list, for example:

commitChangeset = sh( ... ).trim().tokenize(",") where delimiter is ","

And then no need to replace "," by " " in

tfvars = commitChangeset.replaceAll("terraform.tfvars", "")

And then you can use cycle for iterate list:
for (int i = 0; i < commitChangeset.size() ; i++) {
int index=i
sh "(cd ${commitChangeset[index]}; etc... )"
}

05.04.2018 00:24, John пишет:

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Viacheslav Dubrovskyi

Justin Zhang

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Jul 29, 2018, 10:56:21 PM7/29/18

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Hi Slava,

I tried your way, found that the iteration of command only works on the first loop,

For the second loop, it only execute the string. not the command with the string.