doc: Document ‘assume-valid-file-name’ in ‘local-file’.

* doc/guix.texi (G-Expressions): Document the use of assume-valid-file-name with
local-file.

Signed-off-by: Ludovic Courtès <ludo@gnu.org>
Change-Id: I132f78e198cbf3ba2e5a677d671563d753de534c
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Richard Sent 2024-05-08 08:17:51 -04:00 committed by Ludovic Courtès
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@ -12192,6 +12192,18 @@ When @var{recursive?} is true, call @code{(@var{select?} @var{file}
absolute file name and @var{stat} is the result of @code{lstat}; exclude
entries for which @var{select?} does not return true.
@var{file} can be wrapped in the @code{assume-valid-file-name} syntactic
keyword. When this is done, there will not be a warning when
@code{local-file} is used with a non-literal path. The path is still
looked up relative to the current working directory at run time.
Wrapping is done like this:
@lisp
(define alice-key-file-path "alice.pub")
;; ...
(local-file (assume-valid-file-name alice-key-file-path))
@end lisp
This is the declarative counterpart of the @code{interned-file} monadic
procedure (@pxref{The Store Monad, @code{interned-file}}).
@end deffn