Code Inspection: Invalid spaces in ''key=value'' pair

Reports incorrect spacing for key-value pairs in ARG, ENV, and LABEL commands.

While it is not explicitly specified in the Dockerfile specification, some combinations of spacing for key-value pairs are not allowed. Docker build will fail after reaching the problem instruction.

Examples:

The ARG command does not allow any spaces around '='
ENV and LABEL do not allow spaces after '='

  # all the commands below will fail
  ARG answer = 42
  ARG version= "1.0.0"
  LABEL "maintained.by"= someone@gmail.com
  ENV JAVA_HOME= "/docker-java-home"

After the quick-fix is applied:

  ARG answer=2
  ARG version="1.0.0"
  LABEL "maintained.by"=someone@gmail.com
  ENV JAVA_HOME="/docker-java-home"

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Last modified: 11 February 2024