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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.


  • 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 ""= ENV JAVA_HOME= "/docker-java-home"

After the quick-fix is applied:

ARG answer=2 ARG version="1.0.0" LABEL "" ENV JAVA_HOME="/docker-java-home"

Inspection Details

Available in:

CLion 2023.3, GoLand 2023.3, IntelliJ IDEA 2023.3, JetBrains Rider 2023.1, PhpStorm 2023.3, PyCharm 2023.3, Qodana for .NET 2023.1, Qodana for JS 2023.3, Qodana for JVM 2023.3, Qodana for PHP 2023.3, Qodana for Ruby 2023.3, RubyMine 2023.3, WebStorm 2023.3


Docker, 233.SNAPSHOT

Last modified: 13 July 2023