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.

Locating this inspection

By ID

Can be used to locate inspection in e.g. Qodana configuration files, where you can quickly enable or disable it, or adjust its settings.

DockerFileAssignments

Via Settings dialog

Path to the inspection settings via IntelliJ Platform IDE Settings dialog, when you need to adjust inspection settings directly from your IDE.

Settings or Preferences | Editor | Inspections | Dockerfile

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"

Inspection Details
By default bundled with:	CLion 2025.1, GoLand 2025.1, IntelliJ IDEA 2024.3, JetBrains Rider 2024.3, PhpStorm 2024.3, PyCharm 2025.1, Qodana for .NET 2024.3, Qodana for Go 2025.1, Qodana for JS 2025.1, Qodana for JVM 2024.3, Qodana for PHP 2024.3, Qodana for Ruby 2025.1, RubyMine 2025.1, WebStorm 2025.1
Can be installed with plugin:	Docker, 251.24737

01 April 2025