Executing CURL in Shared Library Jenkins Pipeline Using `Process`

Question

I have a method in a shared library in my Jenkins pipeline. The idea is to use this library and upload files to a remote host. The library is imported in a singleton library.

import com.package.jobutil.UploadFile

def uploadFunc() {
 def uploader = new UploadFile(this)
 withCredentials ([usernamePassword(credentialsId: 'user', userNameVariable: 'username', passwordVariable:'password)]) {
  uploader.uploadArtifact("${username}", "${password}", file.txt, location)
 }
}

def call() {
 uploadFunc()
}

The class that is instantiated looks like this:

class UploadFile {
   def steps

   UploadFile (steps) {
     this.steps = steps
   }

   pulic uploadArtifct (String user, String password, String file, String location) {
   Process proc
   def cred = "${user}:${pass}"
   def cmd = ["curl", "-v", "-u", cred, "--upload-file", file, location]
   steps.println "CURL: ${cmd}"

   proc = cmd.execute()
  }
}

Even though I see the println line in the logs. I do not see the curl command being executed. Is there something I am missing that does not invoke the cmd.execute to work?

EDIT

When I use the curl directly in the library, it works.

pulic uploadArtifct (String user, String password, String file, String 
  location) {
  def cred = "${user}:${password}"
  def cmd = "curl -v -u ${cred} --upload-file ${file} ${nexusLocation}/${file}"
  try {

  steps.sh cmd
  } catch (Exception e) {
    throw new RuntimeExceptipon("Cannot execute curl, exception: [${e.getClass().getName()} - '${e.getMessage()}']")
   }
  }

However, when trying to use the Process it does not work.

pulic uploadArtifct (String user, String password, String file, String 
  location) {
  def cred = "${user}:${password}"
  def cmd = ["curl", "-v", "-u", cred, "--upload-file", ${file}, ${location}]
  try {
   def sout = new StringBuffer(), serr = new StringBuffer()
   def proc = cmd.execute()
   proc.consumeProcessOutput(sout, serr)
   proc.waitForOrKill(1000)
   println sout
  } catch (Exception e) {
    throw new RuntimeExceptipon("Cannot execute curl, exception: [${e.getClass().getName()} - '${e.getMessage()}']")
   }
  }

The exception I get is:

java.lang.RuntimeException: Cannot execute curl, exception: [groovy.lang.MissingMethodException - 'No signature of method: java.lang.String.div() is applicable for argument types: (org.codehaus.groovy.runtime.GStringImpl) values: [file.txt]

Answer 1

As explained here, you need to capture stdout/stderr to see anything.

At the very least:

def outputStream = new StringBuffer();
proc.waitForProcessOutput(outputStream, System.err)
//proc.waitForProcessOutput(System.out, System.err)

Or, as in this gist:

def sout = new StringBuffer(), serr = new StringBuffer()
def proc = cmd.execute()
proc.consumeProcessOutput(sout, serr)
proc.waitForOrKill(1000)
println sout

An example of blocking call would be:

println new ProcessBuilder( 'sh', '-c', 'du -h --max-depth=1 /var/foo/bar/folder\\ with\\ spaces | sort -hr').redirectErrorStream(true).start().text

---

def cmd = ["curl", "-v", "-u", cred, "--upload-file", ${file}, ${location}/${file}]
No signature of method: java.lang.String.div() is applicable for argument types: (org.codehaus.groovy.runtime.GStringImpl) values: [file.txt]

The '/' in '${location}/${file}' is interpreted as an '/ (div) operation instead of a string.

Try instead for that curl command argument:

${location}+"/"+${file}

As noted in your subsequent question, the all path needs to be between double-quotes.