From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mp0 ([2001:41d0:2:bcc0::]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) by ms0.migadu.com with LMTPS id 0A8oB8NVkGAQxQAAgWs5BA (envelope-from ) for ; Mon, 03 May 2021 21:57:55 +0200 Received: from aspmx1.migadu.com ([2001:41d0:2:bcc0::]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) by mp0 with LMTPS id WPLfAsNVkGBUNgAA1q6Kng (envelope-from ) for ; Mon, 03 May 2021 19:57:55 +0000 Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by aspmx1.migadu.com (Postfix) with ESMTPS id A312C23824 for ; Mon, 3 May 2021 21:57:54 +0200 (CEST) Received: from localhost ([::1]:58616 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1ldehV-0000vN-Ny for larch@yhetil.org; Mon, 03 May 2021 15:57:53 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:54268) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1ldeh9-0000v2-6a for guix-devel@gnu.org; Mon, 03 May 2021 15:57:31 -0400 Received: from cascadia.aikidev.net ([173.255.214.101]:49826) by eggs.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1ldeh7-00050b-7n for guix-devel@gnu.org; Mon, 03 May 2021 15:57:30 -0400 Received: from localhost (97-120-1-76.ptld.qwest.net [97.120.1.76]) (Authenticated sender: vagrant@cascadia.debian.net) by cascadia.aikidev.net (Postfix) with ESMTPSA id 7DDCF1AA32; Mon, 3 May 2021 12:57:27 -0700 (PDT) From: Vagrant Cascadian To: Tobias Geerinckx-Rice Subject: Re: ISO image: to xz or not to xz? In-Reply-To: <87a6pbocme.fsf@nckx> References: <878s52rwna.fsf@gnu.org> <87bl9ru3ms.fsf@yucca> <87a6pbocme.fsf@nckx> Date: Mon, 03 May 2021 12:57:05 -0700 Message-ID: <878s4vtwtq.fsf@yucca> MIME-Version: 1.0 Content-Type: multipart/signed; boundary="=-=-="; micalg=pgp-sha512; protocol="application/pgp-signature" Received-SPF: none client-ip=173.255.214.101; envelope-from=vagrant@debian.org; helo=cascadia.aikidev.net X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, SPF_HELO_NONE=0.001, SPF_NONE=0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: guix-devel@gnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: "Development of GNU Guix and the GNU System distribution." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: guix-devel@gnu.org Errors-To: guix-devel-bounces+larch=yhetil.org@gnu.org Sender: "Guix-devel" X-Migadu-Flow: FLOW_IN ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=yhetil.org; s=key1; t=1620071874; h=from:from:sender:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type:in-reply-to:in-reply-to: references:references:list-id:list-help:list-unsubscribe: list-subscribe:list-post; bh=vM+zLImiz3YODNlzw/UOF0+S7PIqLVe4/Gt/PbacP08=; b=cMmXjUseyEPjWzUTx3KZt+iBU3M2f+y6V5mj9sI3TtvansgwZg+1WL6BtsnuBOGXijd2U8 e2GuvgKhRTSZ0RzRyHQdmXOJkH9vh27YYtBkkn79FAqnFikdNDZGilRHnT8KWngooPtju6 AdBTYHaSojF7KJY3pEghg/68DTAsshV0q6HMAlSjDCFcVxN5IaMwENIvUBclRTqW2tejD8 orEPaVVRiFPlfiWKQK7ungCkAIKDH2zQworGHxLg3GKegRQ81N7tgD7F0b0lQiC4mcslPw 74kJ50jEtz0Z1/FBEJJkr9HG9zGNRtMCVR3Wnzf4PHfikcfHI/zpsHlp1BVIXA== ARC-Seal: i=1; s=key1; d=yhetil.org; t=1620071874; a=rsa-sha256; cv=none; b=Lym/W85Mk+4LtjjFgNYsWZjp7wtJ2djl2kt0F0RPNOKmtbk4jc5tRz3sR+kw/zfnwXSEI7 JWBuRUR6/UnEt43jnwoJUuW8Vym7uNZDJm/1qe4f33YweoAy8Uk2Me2eVCazXNl1AjTAAD ZDi5rRnV721LTn9Mk/Sw7Ijzzfr5ZBdFgqCIBoLeHC49UBQEugbikQ2PnJ3VRz1FK/k+YF FTM2W3WL9AgvlvIrLIU4yMyOCvFuM7LH3Qcb62L2BYqfh1+X4Rkkj9HRONTu5TfTDu1OGO tK8CrZw5CM4O2CPExcmI9+9d0ydep4IUaOALK1au6U8nHDJE+lxD/cFIdxuRbQ== ARC-Authentication-Results: i=1; aspmx1.migadu.com; dkim=none; dmarc=none; spf=pass (aspmx1.migadu.com: domain of guix-devel-bounces@gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=guix-devel-bounces@gnu.org X-Migadu-Spam-Score: -3.06 Authentication-Results: aspmx1.migadu.com; dkim=none; dmarc=none; spf=pass (aspmx1.migadu.com: domain of guix-devel-bounces@gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=guix-devel-bounces@gnu.org X-Migadu-Queue-Id: A312C23824 X-Spam-Score: -3.06 X-Migadu-Scanner: scn0.migadu.com X-TUID: uDtTEiXTIxZc --=-=-= Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable On 2021-05-03, Tobias Geerinckx-Rice wrote: > Tangent: I sense some undeserved mysticism surrounding squashfs.=20 > It is not designed to be loop-mounted, any more than ext2 was. It=20 > does not enjoy it. People should stop doing it. The only mysticism I see here is attributing enjoyment to a filesystem. :) Is mounting on a loopback device really any different from any other block device? > But they won't, because many distributions still insist that the=20 > same installer image must be both a bootable CD/DVD *and* boot=20 > when dd'd to a USB drive, on every PC ever made. > That =E2=80=98isohybrid=E2=80=99 dream justifies doing unmentionable thin= gs to an=20 > iso9660 file system (and only an iso9660 file system), so they=20 > must put the real squashfs on top of that and loop-mount it and=20 > ignore the screams I guess and-- Never heard the screams; what frequency does squashfs emit screams at? :) People have made it work well enough for only slightly less long than I can remember using free software operating systems... > Vagrant Cascadian =E5=86=99=E9=81=93=EF=BC=9A >> Well, the suggestion to use squashfs does bear merit; > > It's not a *bad* suggestion, just a bit obvious. Fair enough. >> it would require having some type of writeable filesystem on top, >> such as using overlay fs to mount the installer rootfs with squashfs >> for the readonly bits, and tmpfs for the writeable bits. > > We've always done this. I *thought* so, but... >> As a bonus, using a tmpfs overlay would solve the issue brought up >> recently by someone who tried using the same installer image multiple >> times, and /gnu/store and /var/guix got out of sync due to the >> cow-store only writing to the newly installed system, so that the >> second install failed. > > ...so no, it definitely wouldn't, but I think it's valuable to=20 > understand why you thought so! > > Could you elaborate? Mostly I was referring to: https://lists.gnu.org/archive/html/guix-devel/2021-04/msg00546.html Though I haven't confirmed that behavior myself. Probably deserves a proper bug report. live well, vagrant --=-=-= Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iHUEARYKAB0WIQRlgHNhO/zFx+LkXUXcUY/If5cWqgUCYJBVkgAKCRDcUY/If5cW qpzHAP0R1NZpWVe5fHVg9GdVCDu/nXcqCMsAITPI1JjDdfVm5wEA5ueY7kTpkxJi Rd3E0BSj7wtYM3HwqAy4gDnnAtB9mQY= =C/EX -----END PGP SIGNATURE----- --=-=-=--