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salt-project

How to symlink in saltstack latest version or file

ln -fs /opt/app/$(ls -rt file-*.jar | tail -n1) /opt/app/file.jar

works in bash very well

dir contains

file-1.jar
file-2.jar
file-3.jar

How can I do this in a salt stack state sls formula ?

Solution

  • To achieve this in Saltstack we need roughly two steps:

    1. Get the latest file
    2. Link the file

    For the first part, we can use some salt module such as file.find, but I feel the existing logic of using ls -rt is simpler.

    So we can use this command to get the latest JAR file into a variable. Then use a Salt state to link the file.

    Example:

    {% set latest_jar = salt.cmd.run('ls -rt /opt/app/file-*.jar | tail -n1') %}

link-latest-jar:
  file.symlink:
    - name: /opt/app/file.jar
    - target: {{ latest_jar }}

    Update:

    With newer version of Saltstack we need to use salt.cmd.shell to set the latest_jar variable.