Jenkinsfile Accessing variables from shared libraries

[Kernel Panic]

Hello there

Maybe this is a very basic question, but am not being able to access a global variable

from a shared library from a Jenkinsfile

under vars I defined something like this

globalVars.groovy

class Vars () {

    def CustomMessage = "This is a new deployment"

}

from my Jenkinsfile

library identifier: 'globalVars@master', \
                     retriever: modernSCM([$class: 'GitSCMSource', \
                                credentialsId: 'tfsservice', \
                                remote: 'http://myrepo.com', \
                                traits: [gitBranchDiscovery()]])

pipeline {

stages {
    stage('Do Some Stuff') {
      steps {
        script {

           sh 'echo ${CustomMessage}'

          }
        }
      }
    }

}

But the above returns nothing, what am I doing wrong?

Thanks

Regards

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[Adrian Wyssmann]

I see several problem

1. using ' will not expand the parameters is your call should be sh "echo ${CustomMessage}"
2. CustomMessage is declared within the class Vars(), so you cannot access it

You could implement a getter an then do something like this "echo ${globalVars.getCustomMessage()}"

Maybe others have better ideas...?

On Thursday, December 17, 2020 at 12:10:19 AM UTC+1 [hidden email] wrote:

Hello there

Maybe this is a very basic question, but am not being able to access a global variable

from a shared library from a Jenkinsfile

under vars I defined something like this

globalVars.groovy

class Vars () {

    def CustomMessage = "This is a new deployment"

}

from my Jenkinsfile

library identifier: 'globalVars@master', \
                     retriever: modernSCM([$class: 'GitSCMSource', \
                                credentialsId: 'tfsservice', \
                                remote: 'http://myrepo.com', \
                                traits: [gitBranchDiscovery()]])

pipeline {

stages {
    stage('Do Some Stuff') {
      steps {
        script {

           sh 'echo ${CustomMessage}'

          }
        }
      }
    }

}

But the above returns nothing, what am I doing wrong?

Thanks

Regards

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[Ven H]

In my case, I do the following. I have a GlobalVars.groovy file with below content.

#!/usr/bin/env groovy
package com.<companyName>.<ProductName>;

public class GlobalVars {
   static String myVar = ""
}

Then in my Shared Library class, I use it like below.

GlobalVars.myVar = ""

Try it like this and check. Here, I have declared the class as Public and the variable as static. That's the only difference.

On Thu, Dec 17, 2020 at 12:56 PM Adrian Wyssmann <[hidden email]> wrote:

I see several problem

1. using ' will not expand the parameters is your call should be sh "echo ${CustomMessage}"
2. CustomMessage is declared within the class Vars(), so you cannot access it

You could implement a getter an then do something like this "echo ${globalVars.getCustomMessage()}"

Maybe others have better ideas...?

On Thursday, December 17, 2020 at 12:10:19 AM UTC+1 [hidden email] wrote:

Hello there

Maybe this is a very basic question, but am not being able to access a global variable

from a shared library from a Jenkinsfile

under vars I defined something like this

globalVars.groovy

class Vars () {

    def CustomMessage = "This is a new deployment"

}

from my Jenkinsfile

library identifier: 'globalVars@master', \
                     retriever: modernSCM([$class: 'GitSCMSource', \
                                credentialsId: 'tfsservice', \
                                remote: 'http://myrepo.com', \
                                traits: [gitBranchDiscovery()]])

pipeline {

stages {
    stage('Do Some Stuff') {
      steps {
        script {

           sh 'echo ${CustomMessage}'

          }
        }
      }
    }

}

But the above returns nothing, what am I doing wrong?

Thanks

Regards

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[Yannick Lacaute]

Hi,

I think you should not use global variables at all : only global functions. Trust me : you don't need global variables :)
To use global functions : 

# /vars/myGlobFunc.groovy
def call() {
  // ....
}
// This way you can call you function directly in "steps" if you are in declarative pipeline, from anywhere in scripted
// This function has access to other global methods

# Or this way, in /vars/myClass.groovy :
def myGlobFunc.groovy {

   // ...

}
return this
// myClass.myGlobFunc()
// This function has also access to other global methods because of this special class declaration
// But you cannot call this from steps in declarative, you must be inside script

But if you really want global variables, I would recommand to use a single object containing what you need and give this object to people who need it, for example a class or a map :

def myVars = [:]
myVars['myGlobVar'] = 'hello'
pipeline {
  // ...
   aFunction(myVars)
}

# But if you really really want global, just remove the "def" :
myVars = [:]
myVars['myGlobVar'] = 'hello'
pipeline {
  // ...
   aFunction()  // myVars can be read in this function
}
// But I thihnk this is a bad code

Another way is to use static field of class, but it is also a bad pratice to use static field if you want them mutable.

You could also just try to use the existing global var "env". This is a clean solution, but you must only use text values. 
env['myGlobVar'] = "hello"
echo env.myGlobVar

Good luck

On Thu, Dec 17, 2020 at 9:45 AM Ven H <[hidden email]> wrote:

In my case, I do the following. I have a GlobalVars.groovy file with below content.

#!/usr/bin/env groovy
package com.<companyName>.<ProductName>;

public class GlobalVars {
   static String myVar = ""
}

Then in my Shared Library class, I use it like below.

GlobalVars.myVar = ""

Try it like this and check. Here, I have declared the class as Public and the variable as static. That's the only difference.

Regards,
Venkatesh

On Thu, Dec 17, 2020 at 12:56 PM Adrian Wyssmann <[hidden email]> wrote:

I see several problem

1. using ' will not expand the parameters is your call should be sh "echo ${CustomMessage}"
2. CustomMessage is declared within the class Vars(), so you cannot access it

You could implement a getter an then do something like this "echo ${globalVars.getCustomMessage()}"

Maybe others have better ideas...?

On Thursday, December 17, 2020 at 12:10:19 AM UTC+1 [hidden email] wrote:

Hello there

Maybe this is a very basic question, but am not being able to access a global variable

from a shared library from a Jenkinsfile

under vars I defined something like this

globalVars.groovy

class Vars () {

    def CustomMessage = "This is a new deployment"

}

from my Jenkinsfile

library identifier: 'globalVars@master', \
                     retriever: modernSCM([$class: 'GitSCMSource', \
                                credentialsId: 'tfsservice', \
                                remote: 'http://myrepo.com', \
                                traits: [gitBranchDiscovery()]])

pipeline {

stages {
    stage('Do Some Stuff') {
      steps {
        script {

           sh 'echo ${CustomMessage}'

          }
        }
      }
    }

}

But the above returns nothing, what am I doing wrong?

Thanks

Regards

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[Kernel Panic]

Hello

Defining a global class worked for me, at least did what I wanted to do,

Thanks you very much for your time and support

Regards

El jueves, 17 de diciembre de 2020 a las 5:45:11 UTC-3, [hidden email] escribió:

In my case, I do the following. I have a GlobalVars.groovy file with below content.

#!/usr/bin/env groovy
package com.<companyName>.<ProductName>;

public class GlobalVars {
   static String myVar = ""
}

Then in my Shared Library class, I use it like below.

GlobalVars.myVar = ""

Try it like this and check. Here, I have declared the class as Public and the variable as static. That's the only difference.

On Thu, Dec 17, 2020 at 12:56 PM Adrian Wyssmann <[hidden email]> wrote:

I see several problem

1. using ' will not expand the parameters is your call should be sh "echo ${CustomMessage}"
2. CustomMessage is declared within the class Vars(), so you cannot access it

You could implement a getter an then do something like this "echo ${globalVars.getCustomMessage()}"

Maybe others have better ideas...?

On Thursday, December 17, 2020 at 12:10:19 AM UTC+1 [hidden email] wrote:

Hello there

Maybe this is a very basic question, but am not being able to access a global variable

from a shared library from a Jenkinsfile

under vars I defined something like this

globalVars.groovy

class Vars () {

    def CustomMessage = "This is a new deployment"

}

from my Jenkinsfile

library identifier: 'globalVars@master', \
                     retriever: modernSCM([$class: 'GitSCMSource', \
                                credentialsId: 'tfsservice', \
                                remote: 'http://myrepo.com', \
                                traits: [gitBranchDiscovery()]])

pipeline {

stages {
    stage('Do Some Stuff') {
      steps {
        script {

           sh 'echo ${CustomMessage}'

          }
        }
      }
    }

}

But the above returns nothing, what am I doing wrong?

Thanks

Regards

--
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To view this discussion on the web visit https://groups.google.com/d/msgid/jenkinsci-users/099e3aee-dffc-459d-8eb5-d64204effb58n%40googlegroups.com.

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[Kernel Panic]

Hello

Is there a way to access those variables from as sh command from the script section?

for example this works:

script {
                      echo GlobalVariables.MyVariable

                    }

but the same with sh does not, that just echos GlobalVariables.MyVariable and not the variable content.

script {

              sh  ' echo GlobalVariables.MyVariable'

                    }

Thanks

Regards

El jueves, 17 de diciembre de 2020 a las 5:45:11 UTC-3, [hidden email] escribió:

In my case, I do the following. I have a GlobalVars.groovy file with below content.

#!/usr/bin/env groovy
package com.<companyName>.<ProductName>;

public class GlobalVars {
   static String myVar = ""
}

Then in my Shared Library class, I use it like below.

GlobalVars.myVar = ""

Try it like this and check. Here, I have declared the class as Public and the variable as static. That's the only difference.

On Thu, Dec 17, 2020 at 12:56 PM Adrian Wyssmann <[hidden email]> wrote:

I see several problem

1. using ' will not expand the parameters is your call should be sh "echo ${CustomMessage}"
2. CustomMessage is declared within the class Vars(), so you cannot access it

You could implement a getter an then do something like this "echo ${globalVars.getCustomMessage()}"

Maybe others have better ideas...?

On Thursday, December 17, 2020 at 12:10:19 AM UTC+1 [hidden email] wrote:

Hello there

Maybe this is a very basic question, but am not being able to access a global variable

from a shared library from a Jenkinsfile

under vars I defined something like this

globalVars.groovy

class Vars () {

    def CustomMessage = "This is a new deployment"

}

from my Jenkinsfile

library identifier: 'globalVars@master', \
                     retriever: modernSCM([$class: 'GitSCMSource', \
                                credentialsId: 'tfsservice', \
                                remote: 'http://myrepo.com', \
                                traits: [gitBranchDiscovery()]])

pipeline {

stages {
    stage('Do Some Stuff') {
      steps {
        script {

           sh 'echo ${CustomMessage}'

          }
        }
      }
    }

}

But the above returns nothing, what am I doing wrong?

Thanks

Regards

--
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To unsubscribe from this group and stop receiving emails from it, send an email to [hidden email].
To view this discussion on the web visit https://groups.google.com/d/msgid/jenkinsci-users/099e3aee-dffc-459d-8eb5-d64204effb58n%40googlegroups.com.

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[Yannick Lacaute]

Hi,

First, if you want "echo", you could just use echo without the sh :
   echo "hello"

Then, if you want to print a variable in the echo, use this syntax :
   echo "hello ${myGroovyVariable}"
You must use double quote, if you use single quote the echo will print *exactly* what you have written

Le dimanche 20 décembre 2020 à 06:07:56 UTC+1, [hidden email] a écrit :

Hello

Is there a way to access those variables from as sh command from the script section?

for example this works:

script {
                      echo GlobalVariables.MyVariable

                    }

but the same with sh does not, that just echos GlobalVariables.MyVariable and not the variable content.

script {

              sh  ' echo GlobalVariables.MyVariable'

                    }

Thanks

Regards

El jueves, 17 de diciembre de 2020 a las 5:45:11 UTC-3, [hidden email] escribió:

In my case, I do the following. I have a GlobalVars.groovy file with below content.

#!/usr/bin/env groovy
package com.<companyName>.<ProductName>;

public class GlobalVars {
   static String myVar = ""
}

Then in my Shared Library class, I use it like below.

GlobalVars.myVar = ""

Try it like this and check. Here, I have declared the class as Public and the variable as static. That's the only difference.

On Thu, Dec 17, 2020 at 12:56 PM Adrian Wyssmann <[hidden email]> wrote:

I see several problem

1. using ' will not expand the parameters is your call should be sh "echo ${CustomMessage}"
2. CustomMessage is declared within the class Vars(), so you cannot access it

You could implement a getter an then do something like this "echo ${globalVars.getCustomMessage()}"

Maybe others have better ideas...?

On Thursday, December 17, 2020 at 12:10:19 AM UTC+1 [hidden email] wrote:

Hello there

Maybe this is a very basic question, but am not being able to access a global variable

from a shared library from a Jenkinsfile

under vars I defined something like this

globalVars.groovy

class Vars () {

    def CustomMessage = "This is a new deployment"

}

from my Jenkinsfile

library identifier: 'globalVars@master', \
                     retriever: modernSCM([$class: 'GitSCMSource', \
                                credentialsId: 'tfsservice', \
                                remote: 'http://myrepo.com', \
                                traits: [gitBranchDiscovery()]])

pipeline {

stages {
    stage('Do Some Stuff') {
      steps {
        script {

           sh 'echo ${CustomMessage}'

          }
        }
      }
    }

}

But the above returns nothing, what am I doing wrong?

Thanks

Regards

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To view this discussion on the web visit https://groups.google.com/d/msgid/jenkinsci-users/099e3aee-dffc-459d-8eb5-d64204effb58n%40googlegroups.com.

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