From: Tobias Geerinckx-Rice <me@tobias.gr>
To: ludo@gnu.org, dannym@scratchpost.org
Cc: 27735@debbugs.gnu.org
Subject: bug#27735: Unbootable images with GuixSD on... "GuixSD"
Date: Tue, 18 Jul 2017 17:09:08 +0200 [thread overview]
Message-ID: <9b7cffa7-96a4-a799-c207-854bbcc7df04@tobias.gr> (raw)
In-Reply-To: <87bmoi0xua.fsf@gnu.org>
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Ludo',
On 18/07/17 13:49, Ludovic Courtès wrote:
> What about generating a UUID in a deterministic yet somewhat unique
> fashion along these lines (untested):
Not great, but I can't think of a better way. :-)
> + (define root-uuid
> + ;; UUID of the root file system, computed in a deterministic fashion.
> + (if (string=? "iso9660" file-system-type)
> + (let ((pad (compose (cut string-pad <> 2 #\0)
> + number->string)))
> + (string->iso9660-uuid
> + (string-append "1970-01-01-"
> + (pad (hash name 24))
> + (pad (hash file-system-type 60))
> + (pad (hash (operating-system-host-name os) 60)))))
> + (uint-list->bytevector
> + (list (hash (string-append file-system-type name)
> + (expt 2 64))
> + (hash (operating-system-host-name os)
> + (expt 2 64)))
> + (endianness little)
> + 8)))
> +
Why not throw SIZE into this mix as well?
When building without ‘--image-size’ (the default nowadays), it's a
function of the exact size of the entire graph and reasonably sensitive
to most kinds of input changes.
> We cannot use the store file name’s hash, unfortunately, because the
> UUID has to be given on the “host side.”
That is unfortunate, but a best-effort heuristic will do.
Kind regards,
T G-R
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next prev parent reply other threads:[~2017-07-18 15:08 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-07-17 14:40 bug#27735: Unbootable images with GuixSD on... "GuixSD" Tobias Geerinckx-Rice
2017-07-17 14:51 ` bug#27735: [PATCH 1/2] build, vm: Use a slightly less generic label Tobias Geerinckx-Rice
2017-07-17 17:20 ` Danny Milosavljevic
2017-07-17 17:58 ` Tobias Geerinckx-Rice
2017-07-18 10:09 ` Ludovic Courtès
2017-07-18 12:30 ` Tobias Geerinckx-Rice
2017-07-18 13:48 ` Danny Milosavljevic
2017-07-17 17:17 ` bug#27735: Unbootable images with GuixSD on... "GuixSD" Danny Milosavljevic
2017-07-17 18:12 ` Tobias Geerinckx-Rice
2017-07-17 18:37 ` Tobias Geerinckx-Rice
2017-07-18 11:49 ` Ludovic Courtès
2017-07-18 15:09 ` Tobias Geerinckx-Rice [this message]
2017-07-18 18:59 ` Ludovic Courtès
2017-07-18 20:42 ` Tobias Geerinckx-Rice
2017-07-19 19:11 ` Danny Milosavljevic
2017-07-19 22:32 ` bug#27735: Lookup by UUID Ludovic Courtès
2017-07-20 17:38 ` Danny Milosavljevic
2017-07-20 20:32 ` Ludovic Courtès
2017-07-20 21:51 ` Danny Milosavljevic
2017-08-05 17:50 ` Danny Milosavljevic
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