Re: [Fedora-livecd-list] f7 livecd-creator cannot umount image after recent yum updates
FWIW and YMMV, but I started swearing by using a virtual machine (under
vmware) as my LiveCD development machine because of situations like
this. I can't speak to Xen and qemu, but vmware does have a snapshot
feature. I always snapshot a machine then run yum. Then if an update
causes problems with iso creation, I go back to the snapshot. Nothing
like having weird problems with iso creation hit when you're on a
deadline. It's also the primary motivation behind my slowly plugging
away at a LiveCD creation LiveCD... Can't get hosed if it doesn't update...
Tim
Skunk Worx wrote:
I ran yum updates two days ago and now the iso created by
livecd-creator has a few issues. This is a Fedora 7 machine.
1) The tool complains that it cannot umount busy device :
...
Building an initramfs at /boot/livecd-initramfs.img for kernel
2.6.23.15-80.fc7
FATAL: Module ide_cd not found.
FATAL: Module usbhid not found.
Done; initramfs is 4.3M.
umount: /var/tmp/livecd-creator-iiLVNk/install_root: device is busy
umount: /var/tmp/livecd-creator-iiLVNk/install_root: device is busy
ioctl: LOOP_CLR_FD: Device or resource busy
...
(otherwise completes successfully)
2) If I examine the final iso, mounting the squash image and then the
os.img, I find the ext3 fs is inconsistent :
mount -o loop /tmp/foo_sqsh/os.img /tmp/foo_img
EXT3-fs: write access unavailable, cannot proceed.
mount: wrong fs type, bad option, bad superblock on /dev/loop3,
missing codepage or other error
In some cases useful info is found in syslog - try
dmesg | tail or so
dmesg :
loop: module loaded
EXT3-fs: INFO: recovery required on readonly filesystem.
EXT3-fs: write access unavailable, cannot proceed.
# file /tmp/foo_sqsh/os.img
/tmp/foo_sqsh/os.img: Linux rev 1.0 ext3 filesystem data (needs
journal recovery) (large files)
(If I copy the os.img out to a r/w location I can fsck.ext3 it)
3) The /etc/mtab in the os.img ends up errant so sysfs mount on boot
of media complains :
Remounting root filesystem in read-write mode: [ OK ]
Mounting local filesystems: mount: sysfs already mounted or /sys busy
mount: according to mtab, /sys is already mounted on /sys
[FAILED]
For now I am fixing the iso with a script :
1) copy out/fsck.ext3 the os.img file
2) remove the errant /etc/mtab
3) rebuild the squashfs with the new os.img using mksquashfs
4) rebuild the iso
I thought this was obviously a kernel problem, but reverting to an
older kernel on the build host did not fix it.
TIA,
John
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