On Wed, 29 Mar 2006 05:49:13 -0500 Alan Cox <alan@xxxxxxxxxx> wrote: Hi, > On Tue, Mar 28, 2006 at 02:31:19PM -0800, Schlaegel wrote: > > This presents the obvious question: why don't we just check the iso on > > the media instead of the media itself, and thus remove this long > > standing problem. > > If we wanted to do that we would need to do it by walking the mounted iso > file system. The moment we deal with the raw device the kernel starts treating > it as a device not a file system so we get readehead into the twilight zone. > > However I'm glad you asked because you've made me realise we may have the bits > to deal with this as of FC4/5. Specifically we could use the device mapper to > create an ISO sized mapping of the relevant chunk of the CD and check that... > > That might just work Sure. Or something like this: dd conv=idirect if=/dev/cdrom count=right_number | sha1sum And if the dd used on the FC ISO does not support the O_DIRECT feature, just add it. Or write a completely trivial 10 line C program that does the same. I really never understood why there never has been any trivial work-around on the FC images for this very annoying problem. This has been going on for many releases now .. :-( greetings, Rob van Nieuwkerk -- fedora-devel-list mailing list fedora-devel-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/fedora-devel-list
