stat name
stat runs stat(2) on name. If name exists it returns structured data.
If name does not exist then it returns a false value. If stat(2) returns
any other error then it raises an error. The structured value returned if
name exists contains the fields name, size, mode, perm, modTime,
and isDir.
stat is not hermetic: its return value depends on the state of the filesystem
at the moment the template is executed. Exercise caution when using it in your
templates.
Example
{{ if stat (joinPath .chezmoi.homeDir ".pyenv") }}
# ~/.pyenv exists
{{ end }}