David Thompson <dthomps...@worcester.edu> skribis:
> From: David Thompson <da...@gnu.org>
>
> * guix/build/syscalls.scm (pivot-root): New procedure.
> * tests/syscalls.scm: Test it.
[...]
> +(test-assert "pivot-root"
> + (match (pipe)
> + ((in . out)
> + (match (clone (logior CLONE_NEWUSER CLONE_NEWNS))
> + (0
> + (close in)
> + (call-with-temporary-directory
> + (lambda (root)
> + (let ((put-old (string-append root "/real-root")))
> + (mount "none" root "tmpfs")
> + (mkdir put-old)
> + (call-with-output-file (string-append root "/test")
> + (lambda (port)
> + (display "testing\n" port)))
> + (pivot-root root put-old)
> + ;; The test file should now be located inside the root
> directory.
> + (write (file-exists "/test") out)
> + (close out))))
> + (primitive-exit 0))
> + (pid
> + (close out)
> + (read in))))))
Shouldn’t it be:
(file-exists? (string-append put-old "/test"))
To be on the safe side, the last line should probably be:
(eq? #t (read in))
Otherwise a return value of *unspecified* works as well.
Also, ‘waidpid’:
(pid
(close out)
(let ((result (read in)))
(close in)
(and (zero? (status:exit-val (waitpid pid)))
(eq? #t result))))
OK with these changes.
Ludo’.
