Code Inspections in Dockerfile

This topic lists all PhpStorm code inspections available in Dockerfile.

You can toggle specific inspections or change their severity level on the Editor | Inspections page of settings Ctrl+Alt+S.

Inspection	Description	Default Severity
A single quoted string in JSON array format	Reports a single quoted string in JSON array format. JSON array form, must use double-quotes (") around words not single-quotes ('). Otherwise, Docker build will fail. Examples: # all the commands below will fail RUN ['/bin/bash', '-c', 'echo hello'] ADD ['binaryA.jar', 'binary2.jar', 'destination/'] COPY ['binaryA.jar', 'binary2.jar', 'destination/'] After the quick-fix is applied: RUN ["/bin/bash", "-c", "echo hello"] ADD ["binaryA.jar", "binary2.jar", "destination/"] COPY ["binaryA.jar", "binary2.jar", "destination/"]	Warning
Invalid destination for ''ADD''/''COPY'' commands	Reports invalid destination directories in `ADD` and `COPY` commands. According to the Dockerfile specification, if multiple sources are specified, then the destination must be a directory, and it must end with a slash '/'. Otherwise, Docker build will fail. Examples: # all the commands below will fail ADD textA.txt textB.txt relativeDir ADD ["binaryA.jar", "binary2.jar", "destination"] COPY text3.txt text4.txt /absolute/path After the quick-fix is applied: ADD textA.txt textB.txt relativeDir/ ADD ["binaryA.jar", "binary2.jar", "destination/"] COPY text3.txt text4.txt /absolute/path/	Warning
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"	Error
Missing continuation character for ''RUN'' command	Reports missing continuation characters in `RUN` command. In the shell form of `RUN` command you should use a '\' (backslash) to continue a single `RUN` instruction onto the next line. Otherwise, Docker build will fail. Examples: # the command below will fail RUN /bin/bash -c 'source $HOME/.bashrc; echo $HOME' After the quick-fix is applied: RUN /bin/bash -c 'source $HOME/.bashrc; \ echo $HOME'	Error
Wrong number of arguments	Reports invalid number of arguments for the Dockerfile commands. Docker build will fail after reaching the instruction with an invalid number of arguments.	Error

Last modified: 11 February 2024