chroot

#!/rescue/sh
PATH=/rescue

MDMFS_SIZE=%%MDMFS_SIZE%%
NAME_MEM_LIVE=%%NAME_MEM_LIVE%%
NAME_UFS=%%NAME_UFS%%

trap "@echo Recovery console: ; PATH=/rescue /rescue/csh -i ; trap '' EXIT ; exit" 1 2 3 6 15 EXIT

set -e

if [ -f /base.ufs.uzip ]
then
  echo "Mounting compressed base:"
  mount -o ro /dev/$(mdconfig -a -t vnode -o readonly -f /base.ufs.uzip).uzip /base
else
  echo "Mounting base:"
  mount -o ro /dev/$(mdconfig -a -t vnode -o readonly -f /base.ufs) /base
fi

if [ -w /dev/ufs/${NAME_UFS} ]
then
  echo -n "Overlaying filesystem:"
  mount /dev/ufs/${NAME_UFS} /overlay
else
  echo -n "Allocating temporary filesystem (${MDMFS_SIZE}):"
  mdmfs -s ${MDMFS_SIZE} md /overlay
  echo .
 
  echo -n "Overlaying temporary filesystem:"
fi
mount -t unionfs -o noatime -o copymode=transparent /overlay /base
echo .

mount -t devfs devfs /base/dev

echo "Patching /etc/rc.conf"
if [ ! -f /base/etc/rc.conf ]
then
  echo "root_rw_mount=\"NO\"" > /base/etc/rc.conf
else
  case $(cat /base/etc/rc.conf) in
    *root_rw_mount=*)
      ;;
    *)
      echo >> /base/etc/rc.conf
      echo "root_rw_mount=\"NO\"" >> /base/etc/rc.conf
      ;;
  esac
fi

CD_DEV=$(dmesg | sed -n -e "s|.* a\(cd[0-9]\+\) .*iso9660/${NAME_MEM_LIVE}.*|\1|p" | sed "1 q")
if [ -n "$CD_DEV" ]
then
  echo "Ejecting CD-ROM..."
  if [ -f /base/boot/kernel/atapicam.ko -a -z "$(kldstat -v | grep ata/atapicam)" ]
  then
    kldload /base/boot/kernel/atapicam.ko
  fi
  camcontrol eject $CD_DEV
fi

echo "Chroot to base..."
trap "" EXIT