[jira] [Created] (KARAF-4704) Unwanted variable interpolation in shell scripts

["Jens Offenbach (JIRA)" <ji...@apache.org>]

Jens Offenbach created KARAF-4704:
-------------------------------------

             Summary: Unwanted variable interpolation in shell scripts
                 Key: KARAF-4704
                 URL: https://issues.apache.org/jira/browse/KARAF-4704
             Project: Karaf
          Issue Type: Bug
          Components: karaf-shell
    Affects Versions: 4.1.0
            Reporter: Jens Offenbach


There is a variable interpolation problem in the shell scripts "/bin/shell", "/bin/start", "/bin/client", ... of Karaf 4.1.0-SNAPSHOT. All affected files can be found here: https://github.com/apache/karaf/tree/master/assemblies/features/base/src/main/filtered-resources/resources/bin). 

Because the shell scripts get filtered by Maven, the variable ${PWD} gets accidently replaced during the build process by "/home/jenkins/jenkins-slave". I am refering to the nightly builds available in the Apache Snapshot Repository: https://repository.apache.org/content/groups/snapshots-group/org/apache/karaf/apache-karaf/4.1.0-SNAPSHOT/

IS:
realpath() {
  OURPWD=/home/jenkins/jenkins-slave
  cd "$(dirname "${1}")"
  LINK=$(readlink "$(basename "${1}")")
  while [ "${LINK}" ]; do
    cd "$(dirname "${LINK}")"
    LINK=$(readlink "$(basename "${1}")")
  done
  REALPATH="/home/jenkins/jenkins-slave/$(basename "${1}")"
  cd "${OURPWD}"
  echo "${REALPATH}"
}

SHOULD:
realpath() {
  OURPWD=${PWD}
  cd "$(dirname "${1}")"
  LINK=$(readlink "$(basename "${1}")")
  while [ "${LINK}" ]; do
    cd "$(dirname "${LINK}")"
    LINK=$(readlink "$(basename "${1}")")
  done
  REALPATH="${PWD}/$(basename "${1}")"
  cd "${OURPWD}"
  echo "${REALPATH}"
}

We can replace ${PWD} by \${PWD}, whereas "\" is the default escapeString. But we should find a solution that avoids unwanted interpolation at all. The best solution would be to define a custom delimiter for the Maven resource plugin which does not overlap with statements within the shell code.



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