Code Inspections in Dockerfile

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:

After the quick-fix is applied:

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:

After the quick-fix is applied:

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 '='

After the quick-fix is applied:

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:

After the quick-fix is applied:

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