On Fri, Aug 27, 2010 at 05:04:57PM +0200, Paul de Weerd wrote: > On Fri, Aug 27, 2010 at 08:38:57PM +0800, Marcus wrote: > | how to fix fstab in single user mode for bootable "Live" USB drive > | > | http://www.openbsd.org/faq/faq14.html#flashmemLive > | says: > | If your target machine has an ahci(4) or SCSI interface, you will > | probably find your USB drive's identifier changing. Having multiple > | versions of your /etc/fstab file may make this easier to "fix" (in > | single user mode). > | > | Install OpenBSD to USB drive in a notbook. the usb drive is > | recognized as "sd1" > | > | Now put the USB drive into another PC an boot from USB. the usb dirve > | is recognized as "sd0". > | > | in the single user mode. > | "fsck -p / && mount -uw /" not work > | "fsck -p /usr && mount /usr" not work > | "vi /etc/fstab" not work. > | > | question: > | how to mount root / writable and active vi editor? > > Don't. There's no need. Here's how you do it even easier (requires > recent snap / source) > > [ -f /dev/diskmap ] || ( cd /dev; sudo MAKEDEV diskmap ) > echo wq | disklabel -E YOURDISK > UID=`disklabel YOURDISK | grep ^uid: | cut -f2 -d' '` > { echo ",s#/dev/YOURDISK#${UID}.#"; echo w; } | ed - /etc/fstab > > Do not try this until you understand what it does. You'll have to > edit it to your needs anyway. > > This new uid stuff is really cool, thanks jsing@ ! > > Paul 'WEiRD' de Weerd > > -- > >++++++++[<++++++++++>-]<+++++++.>+++[<------>-]<.>+++[<+ > +++++++++++>-]<.>++[<------------>-]<+.--------------.[-] > http://www.weirdnet.nl/
This is the correct answer. I have a USB stick I install/upgrade to. I boot from it on systems where it appears as sd0, sd1, sd3, sd4. Works perfectly. All hail jsing! ..... Ken
