From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mp2 ([2001:41d0:8:6d80::]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) by ms0.migadu.com with LMTPS id YBFUOiVLkGCbqQAAgWs5BA (envelope-from ) for ; Mon, 03 May 2021 21:12:37 +0200 Received: from aspmx1.migadu.com ([2001:41d0:8:6d80::]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) by mp2 with LMTPS id KCzzNSVLkGArdwAAB5/wlQ (envelope-from ) for ; Mon, 03 May 2021 19:12:37 +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 873A12D577 for ; Mon, 3 May 2021 21:12:37 +0200 (CEST) Received: from localhost ([::1]:36606 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1lddzg-0003M4-Kw for larch@yhetil.org; Mon, 03 May 2021 15:12:36 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:46806) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lddzV-0003Lq-Si for guix-devel@gnu.org; Mon, 03 May 2021 15:12:25 -0400 Received: from tobias.gr ([2a02:c205:2020:6054::1]:37388) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lddzT-00035O-UD for guix-devel@gnu.org; Mon, 03 May 2021 15:12:25 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=tobias.gr; s=2018; bh=UJaxEhw27q344LGuvuQ/SbmlzbsQIL9TztTL6NW2+G4=; h=date:in-reply-to: subject:cc:to:from:references; b=pF0B809LjS2Q11Iw757v+54U+PmAi1JnQ1j5Q /FPAd17OGf0g+5aKVEYCHxSy9uys1trFf5YsYFUAWmqOEM4XWpoH0uGjMjgPOzCFJGqXAT M4TRYdmVHXyObmkGpjTizChGGL6LyeqNOU8U4khWMulmu1/BjxZSje1bK4hpaRs4/N9acH GEGQbMNQaKPtWWmoM99wcxdvGuIin8wm5F25ijE1qjLl7G+EHPrAjgWr9HCmaG0NysNcV+ vuqA7xVzhiyKkJqtB+vdNJjhCDW0PpcoGzialdNgDFeT+FeFX5HnJ4/1csrS1LwHX4PEzf hej5hr5pUL7GPicKC0uu9emUA== Received: by submission.tobias.gr (OpenSMTPD) with ESMTPSA id 7b0faba2 (TLSv1.2:ECDHE-ECDSA-AES256-GCM-SHA384:256:NO); Mon, 3 May 2021 19:12:30 +0000 (UTC) References: <878s52rwna.fsf@gnu.org> <87bl9ru3ms.fsf@yucca> From: Tobias Geerinckx-Rice To: Vagrant Cascadian Cc: Leo Famulari , Alexandre Oliva , guix-devel@gnu.org Subject: Re: ISO image: to xz or not to xz? 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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. 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 things= 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-- ...sorry; I got carried away. 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. > it would require > having some type of writeable filesystem on top, such as using=20 > overlay > fs to mount the installer rootfs with squashfs for the readonly=20 > bits, > and tmpfs for the writeable bits. We've always done this. > As a bonus, using a tmpfs overlay would solve the issue brought=20 > up > recently by someone who tried using the same installer image=20 > multiple > times, and /gnu/store and /var/guix got out of sync due to the=20 > cow-store > only writing to the newly installed system, so that the second=20 > install > failed. ...so no, it definitely wouldn't, but I think it's valuable to=20 understand why you thought so! Could you elaborate? > Another angle might be to use a compressable but writeable=20 > filesystem > (btrfs?). A persistently mutable . . . installation medium . . . ? Very lost, slightly frightened, T G-R --=-=-= Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iIMEARYKACsWIQT12iAyS4c9C3o4dnINsP+IT1VteQUCYJBLGQ0cbWVAdG9iaWFz LmdyAAoJEA2w/4hPVW15BEcA/AsMBEmCn0ENIU6qfy9UufR8UDIj9G9IhghH907l KPCDAQCChQ8fL1GnN4qvnE2eQrSPV/lAtobx9BUE7tHVCVE3DQ== =A41x -----END PGP SIGNATURE----- --=-=-=--