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|
#!/bin/sh
# This is a special init for the boot floppy image.
# It loads the main d-i initrd from either a second floppy, or a USB
# storage device.
#
# Throughout we use BOOT_DEBUG to turn on debugging. 1 = minimal,
# 2 = set -x, with 3 you'll get shells in strategic places.
#
# INSTALL_MEDIA_DEV can be passed as a boot parameter to force only
# one device or set of devices to be scanned.
# The identification of this floppy and the desired root floppy.
SYSTEM=debian-installer
LABEL="boot floppy"
ROOT_LABEL="root floppy"
abort () {
echo $1 >&2
echo "Giving up!" >&2
sleep 5000
exit
}
debugshell () {
if [ "$BOOT_DEBUG" -gt 2 ]; then
echo "This is a debug shell ($1)."
sh
fi
}
if [ "$BOOT_DEBUG" -gt 1 ]; then
set -x
fi
if [ -n "$INSTALL_MEDIA_DEV" ] && echo "$INSTALL_MEDIA_DEV" | grep -qv floppy; then
NO_FLOPPY=1
fi
if [ -n "$INSTALL_MEDIA_DEV" ] && echo "$INSTALL_MEDIA_DEV" | grep -qv scsi; then
NO_SCSI=1
fi
mount -t proc proc proc
modprobe vfat >/dev/null
modprobe loop >/dev/null
debugshell "before hardware detection"
if [ ! "$NO_FLOPPY" ]; then
modprobe floppy >/dev/null
fi
if [ ! "$NO_SCSI" ]; then
if [ -x /usr/sbin/usb-discover ]; then
/usr/sbin/usb-discover
fi
# This is currently needed or usb-storage won't load (for ide_fix_driveid).
modprobe ide-core >/dev/null
modprobe usb-storage >/dev/null
modprobe sd_mod >/dev/null
fi
debugshell "after hardware detection"
echo
echo
echo
echo
echo
LOADED=0
while [ "$LOADED" = 0 ]; do
MOUNTED=0
while [ "$MOUNTED" = 0 ]; do
echo
echo "Insert the $ROOT_LABEL or plug in a USB storage device."
GOTLINE=0
while [ "$GOTLINE" = 0 ]; do
OLDPRINTK=$(cat /proc/sys/kernel/printk)
echo 0 > /proc/sys/kernel/printk
echo -n "Press Enter when ready, or type a command: "
read line
echo $OLDPRINTK > /proc/sys/kernel/printk
if [ -n "$line" ]; then
# inexpensive and easy and it makes this a lot more flexible!
eval "$line" || true
else
GOTLINE=1
fi
done
# Look for any storage devices we can find.
# Only ones that we have modules loaded for should exist,
# so this is not at brute-force as it may seem.
# It's done each time through the loop as USB devices may
# be inserted at any time.
DEVS=""
if [ -z "$INSTALL_MEDIA_DEV" ]; then
if [ -d /dev/floppy ]; then
DEVS=/dev/floppy/?
fi
if [ -d /dev/scsi ]; then
DEVS="$DEVS `find /dev/scsi`"
fi
else
DEVS="`find $INSTALL_MEDIA_DEV`"
fi
ERR=""
for dev in $DEVS; do
if [ "$MOUNTED" = 0 ] && [ -b $dev ]; then
# XXX as a mount point, /floppy is not
# quite right, as this may be USB storage,
# whatever.
if mount $dev -o ro -tvfat floppy 2>/dev/null; then
if [ -e floppy/disk.lbl ] && grep -q "^System: " floppy/disk.lbl; then
if ! grep -q "^System: $SYSTEM$" floppy/disk.lbl; then
ERR="$ERR; $dev: not a $SYSTEM floppy"
elif grep -q "^Label: $LABEL$" floppy/disk.lbl; then
ERR="$ERR; $dev: still the $LABEL"
else
cat floppy/disk.lbl
MOUNTED=1
fi
else
echo "The disk has no label, continuing anyway."
MOUNTED=1
fi
if [ "$MOUNTED" = 0 ]; then
umount floppy || echo "umount failed!"
fi
else
ERR="$ERR; $dev: cannot mount"
fi
fi
done
if [ "$MOUNTED" = 0 ]; then
if [ -n "$ERR" ]; then
# ERR begins with a semicolon
echo "Cannot find $ROOT_LABEL$ERR"
else
echo "No devices found!"
fi
fi
done
if grep -q tmpfs /proc/filesystems; then
mount -t tmpfs -o size=100M tmpfs mnt
else
mount -t shm shm mnt
fi
echo -n "Loading.."
# pipe_progress adds dots to the above line while there is
# activity. But we must be sure to catch errors from the zcat.
# Hard to do in a pipeline..
rm -f /tmp/zcat_failure
(zcat floppy/initrd.gz || echo 1 > tmp/zcat_failure ) | pipe_progress > mnt/tmp-initrd || abort "failed to extract initrd (may be out of space on ram disk)"
if [ ! -e /tmp/zcat_failure ]; then
LOADED=1
else
rm -f /tmp/zcat_failure
echo "install media seems to be bad!" >&2
debugshell "bad media mounted"
umount mnt
fi
umount floppy
done
echo "Setting up filesystem..."
umount /initrd # the original initrd
mount -o loop mnt/tmp-initrd /initrd
cp -a /initrd/* mnt || abort "failed copying filesystem (may be out of space on ram disk)"
rm -f mnt/tmp-initrd
umount /initrd
debugshell "filesystem loaded and set up"
# dev will be unmounted by rcS
umount proc
echo "Starting the installer..."
cd mnt
pivot_root . initrd
mount -t proc proc proc
mount -t devfs devfs dev
# If this is missing, things can get *really* weird.
if [ ! -x /usr/sbin/chroot ]; then
abort "Bad initrd! Cannot chroot."
fi
# Close all open files on the initrd, and run busybox init.
rm -f sbin/init # probably not busybox init
ln -s ../bin/busybox sbin/init
debugshell "before chroot"
exec /usr/sbin/chroot . /sbin/init <dev/console >dev/console 2>&1
|
