»file Function

file reads the contents of a file at the given path and returns them as a string.


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.


> file("${path.folder}/hello.txt")
Hello World
> file("${path.folder}/hello.txt")Hello World

»Related Functions

  • fileexists determines whether a file exists at a given path.