packer inspect command takes a template and outputs the various
components a template defines. This can help you quickly learn about a template
without having to dive into the HCL itself. The command will tell you things
like what variables a template accepts, the builders it defines, the
provisioners it defines and the order they'll run, and more.
This command is extra useful when used with machine-readable output enabled. The command outputs the components in a way that is parseable by machines.
The command doesn't validate the actual configuration of the various components
(that is what the
validate command is for), but it will validate the syntax
of your template by necessity.
Given a basic template, here is an example of what the output might look like:
$ packer inspect template.pkr.hcl > input-variables: var.aws_access_key: "<sensitive>" var.aws_secret_key: "<sensitive>" > local-variables: > builds: > <unnamed build 0>: sources: amazon-ebs.foo amazon-instance.bar virtualbox-iso.basic provisioners: shell post-processors: <no post-processor>