[Fedora-livecd-list] f7 livecd-creator cannot umount image after recent yum updates

[Tim Wood]

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
>
> -- 
> Fedora-livecd-list mailing list
> Fedora-livecd-list at redhat.com
> https://www.redhat.com/mailman/listinfo/fedora-livecd-list
>


-- 
_________________________________
Tim Wood, CLP, RHCT
719.338.7484 (tel)

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