If the local directory database is damaged, boot into single- user mode by holding down -S as the system starts up. Next, check to see if you have a backup of the NetInfo database. The daily periodic job backs up the database each time it is run. You can find the backup in /var/ backups /local.nidump . If you don't have a backup, you won't be able to restore. The local.nidump file is overwritten each time the cron job runs, so make sure you back it up regularly (preferably to some form of removable media).
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After the system boots in single-user mode, you should:
Wait for the root# prompt to come up.
Fix any filesystem errors:
# /sbin/fsck -fy
Mount the root filesystem as read/write:
# /sbin/mount -uw /
Change directories and go to the NetInfo database directory:
# cd /var/db/netinfo/
Move the database out of the way and give it a different name :
# mv local.nidb/ local.nidb.broken
Start enough of the system to use NetInfo. The /etc/rc script also creates a blank NetInfo database when it sees that it no longer exists:
# sh /etc/rc
Wait for a while for the system to become readyjust before it's ready, you should see the screen go blue as though it's going to show you the login window. However, it will return to the verbose boot screen with the black background, and you can press Control-L or Return to get your shell prompt back. Next, load the backup into NetInfo:
# /usr/bin/niload -d -r / . < /var/backups/local.nidump
When it saw that the NetInfo database needed to be recreated, /etc/rc deleted the .AppleSetupDone file, so you need to recreate it:
# touch /var/db/.AppleSetupDone
After you have completed these steps, reboot the system with the reboot command.