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From: Maxim Cournoyer <maxim.cournoyer@gmail.com>
To: Danny Milosavljevic <dannym@scratchpost.org>
Cc: Stefan <stefan-guix@vodafonemail.de>, 41011@debbugs.gnu.org
Subject: [bug#41011] [PATCH] gnu: grub: Support for network boot via tftp/nfs.
Date: Sun, 14 Jun 2020 14:56:23 -0400	[thread overview]
Message-ID: <87eeqhh3xk.fsf@gmail.com> (raw)
In-Reply-To: <20200611151937.204ad14d@scratchpost.org> (Danny Milosavljevic's message of "Thu, 11 Jun 2020 15:19:37 +0200")

Hello Danny,

Danny Milosavljevic <dannym@scratchpost.org> writes:

> Hi Maxim,
> Hi Stefan,
>
> On Thu, 11 Jun 2020 00:21:11 -0400
> Maxim Cournoyer <maxim.cournoyer@gmail.com> wrote:
>
>> >   (define (device-string->file-system-device device-string)
>> >     ;; The "--root=SPEC" kernel command-line option always provides a
>> >     ;; string, but the string can represent a device, a UUID, a
>> >     ;; label or a NFS spec.  So check for all three.
>> >     (cond ((string-prefix? "/" device-string) device-string)
>> >           ((uuid device-string) => identity)
>> >           (else (file-system-label device-string))))
>> >
>> > But looking at the condition (uuid device-string) I have no idea what that means,
>> > or is bound to!  
>> 
>> It means that if the device-string (a string as its name imply) contains
>> something that represent a UUID, return its corresponding UUID object.
>> `uuid' comes from (gnu system uuid).  Does that answer your question?
>
> Oh!  I've looked at now it but I still don't get it.

Perhaps the '=>' syntax is the reason why? The the Guile Reference info
manual defines it as such:

     For the ‘=>’ clause type, EXPRESSION is
     evaluated and the resulting procedure is applied to the value of
     TEST.  The result of this procedure application is then the result
     of the ‘cond’-expression.

(uuid device-string) returns either #f or a uuid object.  So applying
the identity function to a uuid object yields that same object.

HTH!

Maxim




  parent reply	other threads:[~2020-06-14 18:57 UTC|newest]

Thread overview: 54+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-01 20:32 [bug#41011] [PATCH] gnu: grub: Support for network boot via tftp/nfs Stefan
2020-05-10  8:20 ` Mathieu Othacehe
2020-05-10 21:13   ` Stefan
2020-05-18 21:43     ` Stefan
2020-05-21 15:07       ` Stefan
2020-05-21 18:40         ` Stefan
2020-05-23  8:10           ` Mathieu Othacehe
2020-05-24  0:22             ` Stefan
2020-05-23  8:02     ` Mathieu Othacehe
2020-05-24 10:18       ` Stefan
2020-05-24 11:00         ` Danny Milosavljevic
2020-05-24 13:09           ` Stefan
2020-05-24 13:42             ` Danny Milosavljevic
2020-05-24 13:58               ` Danny Milosavljevic
2020-05-24 17:06                 ` Stefan
2020-05-24 16:47               ` Stefan
2020-06-06 13:30         ` Stefan
2020-06-06 13:33           ` Stefan
2020-06-06 17:37             ` Danny Milosavljevic
     [not found]               ` <46CD97B3-9994-4AB7-AA7D-4DE39AB7A238@vodafonemail.de>
2020-06-09 13:44                 ` Danny Milosavljevic
2020-06-09 14:25                   ` Stefan
2020-06-11  4:21                   ` Maxim Cournoyer
2020-06-11 11:36                     ` Stefan
2020-06-11 13:07                       ` Maxim Cournoyer
2020-06-11 13:19                     ` Danny Milosavljevic
2020-06-12 14:41                       ` Stefan
2020-06-14 18:56                       ` Maxim Cournoyer [this message]
2020-06-11 23:43                     ` [bug#41820] [PATCH] file-systems: Add record type <nfs-share> for a file system device Stefan
2020-06-20 13:52                       ` Stefan
2020-06-12  0:06                     ` [bug#41011] [PATCH] gnu: grub: Support for network boot via tftp/nfs Stefan
2020-06-14 19:09                       ` Maxim Cournoyer
2020-06-17 13:12                         ` Stefan
2020-09-05 11:25 ` Stefan
2020-09-06 13:07   ` Stefan
2020-09-06 14:35   ` Danny Milosavljevic
2020-09-06 15:14     ` Danny Milosavljevic
2020-09-07 22:59     ` Stefan
2020-09-08 22:37       ` Danny Milosavljevic
2020-09-13 17:46         ` [bug#41011] [PATCH] gnu: grub: Support for network boot via TFTP Stefan
2020-09-14  6:59           ` Efraim Flashner
2020-09-15 20:28             ` Stefan
2020-09-16  7:51               ` Efraim Flashner
2020-09-19 17:54                 ` Stefan
2020-09-20 11:47                   ` Stefan
2020-09-20 11:56                     ` Stefan
2020-09-26 10:52                       ` Stefan
2020-09-26 10:54                       ` Stefan
2020-09-26 16:13                         ` Danny Milosavljevic
2020-09-27 10:50                           ` Stefan
2020-09-27 10:51                             ` Stefan
2020-09-27 11:47                               ` Danny Milosavljevic
2020-09-14 12:34           ` Danny Milosavljevic
2020-09-15 22:10           ` Danny Milosavljevic
2020-09-27 11:57 ` bug#41011: " Stefan

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