Date: Mon, 4 Jul 2005 10:44:54 +0200 From: Ulrich Spoerlein <spoerlein@informatik.uni-wuerzburg.de> To: Dario Freni <saturnero@freesbie.org> Cc: freebsd-current@freebsd.org Subject: Re: Weird behaviour of mount_unionfs with executables Message-ID: <20050704084453.GB941@galgenberg.net> In-Reply-To: <20050702124048.GB89744@cvs.freesbie.org> References: <20050702124048.GB89744@cvs.freesbie.org>
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--+pHx0qQiF2pBVqBT Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Sat, 02.07.2005 at 14:40:48 +0200, Dario Freni wrote: > Hi everybody, I'm working on rewriting FreeSBIE toolkit for my Summer > of Code project. Before that, I'm trying to adapt actual scripts with > latest -current (expecially ppc). I noticed a weird behaviour of > unionfs either in i386 and ppc. Under FreeSBIE, we use to mount memory > file systems over compressed ones via unionfs. Under -current, > whenever I recall an rwx file, it is correctly executed the first > time, then it is copied to the upper layer (why? I haven't modified it > yet) with wrong permission, so it is unexecutable. I did something like this a year ago, when I first heard about FreeSBIE. (Together with a completely different way of installing packages). I mounted one big md on /etc, /usr/local/etc, /var and /home. That way you don't need to worry about binaries. Similarly, if someone fills up the md, tough luck. I guess the file is copied to the upper layer, because of atime changes, you want to disable them as well. I don't know the current status wrt to FreeSBIE, but you should really use ISO9600 as the root FS, that should make sure no atime updates are tried. > I'm also afraid that copying files to the upper layer also when > they're not modified could fill up our mfs entirely. I'm almost sure > there's a totally different behaviour under RELENG_5, as we haven't > encountered such problems. I made it so, that one could specify a large file on a FAT32 partition, that file then got attached to /dev/md0 and unionfs-mounted. That way one could have a 2 GB md, which should be enough for everybody. This also gives persistent configurations across reboot. That, coupled with a script, looking for that special file on every partition (USB-Sticks, for example) on boot-up made it very convenient to work with. I recon the Knoppix guys have now adapted a similar scheme ... Ulrich Spoerlein --=20 PGP Key ID: F0DB9F44 Encrypted mail welcome! Fingerprint: F1CE D062 0CA9 ADE3 349B 2FE8 980A C6B5 F0DB 9F44 Ok, which part of "Ph'nglui mglw'nafh Cthulhu R'lyeh wgah'nagl fhtagn." didn't you understand? --+pHx0qQiF2pBVqBT Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.1 (FreeBSD) iD8DBQFCyPcFmArGtfDbn0QRAhsSAJ9YUWw3+sHIkVBu0AWUG5OJ40dzjQCfWVXu 1nQNPyrJqUCboc+0TuIcqiA= =J8uR -----END PGP SIGNATURE----- --+pHx0qQiF2pBVqBT--
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