file reads the contents of a file at the given path and returns them as
Strings in the Packer language are sequences of Unicode characters, so this function will interpret the file contents as UTF-8 encoded text and return the resulting Unicode characters. If the file contains invalid UTF-8 sequences then this function will produce an error.
This function can be used only with files that already exist on disk at the beginning of a Packer run. Functions do not participate in the dependency graph, so this function cannot be used with files that are generated dynamically during a Packer operation.
fileexistsdetermines whether a file exists at a given path.