Description of problem:
On live USB images created with livecd-creator and livecd-iso-to-disk /mnt/live ends up with some strange behaviour: liveuser can create files and write to them once, but not update them.
mount | grep /mnt/live
/dev/sdb1 on /mnt/live type vfat (rw)
grep /mnt/live /proc/mounts
/dev/sdb1 /mnt/live vfat rw,relatime,fmask=0022,dmask=0000,allow_utime=0022,codepage=cp437,iocharset=ascii 0 0
My specific problem was/is that I wanted a writable vfat system. (I learned the hard way that "mount" doesn't report all current mount options, and also that apparently successful remount can make extra options show up in the output without actually being applied.)
I could understand if liveuser couldn't write at all or if it was fully writable, but I don't see a usecase for the current behaviour.
I don't know where these default values come from. It seems to be the kernels default when mounting a vfat root file system? Could/shout it be fixed in the kernel?
The masks can be overruled in isolinux.cfg by specifying rootflags. livecd-creator _could_ use that workaround, either hardcoding it to something sane or making it configurable.
Version-Release number of selected component (if applicable):
We just run mount -- changing the defaults should really be done in the kernel not by a workaround in livecd-tools (the latter is going to end up breaking some day when the kernel option changes)
The problem seems to be solved with f12 and dracut - but it probably remains here in f11.
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