1 files changed, 95 insertions, 0 deletions
diff --git a/scripts/local-top/udev_helper b/scripts/local-top/udev_helper
new file mode 100755
index 0000000..8ae47d2
--- /dev/null
+++ b/scripts/local-top/udev_helper
@@ -0,0 +1,95 @@
+#!/bin/sh
+
+PREREQ="udev"
+
+prereqs()
+{
+	echo "$PREREQ"
+}
+
+case $1 in
+# get pre-requisites
+prereqs)
+	prereqs
+	exit 0
+	;;
+esac
+
+# Our job now is to make the block device for the root filesystem available.
+# This is actually a bit trickier than it first appears because we first need
+# to figure out which driver needs it, and to do that, we need to know what
+# type of bus it's on.  Fortunately we have all that information, this still
+# feels like an ungodly hack though.
+case "${ROOT}" in
+/dev/root)
+	# An interesting case, this root device was specified as a
+	# major/minor pair.  Fortunately we have that information
+	case "${major}" in
+	3|22|33|34|56|57|88|89|90|91)
+		# traditional ide
+		root_type=ide
+		;;
+	80|81|82|83|84|85|86|87)
+		# ide on i2o
+		root_type=ide
+		;;
+	8|11|65|66|67|68|69|70|71|128|129|130|131|132|133|134|135)
+		# scsi
+		root_type=scsi
+		;;
+	esac
+	;;
+/dev/hd*)
+	# Ahh, plain-old traditional ide
+	root_type=ide
+	;;
+/dev/sd*)
+	# SCSI, or an IDE controller dressed up in drag
+	root_type=scsi
+	;;
+/dev/disk/*)
+	# Specified by label; sadly there's no way to tell what bus
+	# this is on, so we'll just declare that we only support it
+	# for SCSI and removable devices
+	root_type=scsi
+	;;
+esac
+
+case "${root_type}" in
+ide)
+	# If we're booting from IDE, it might not be a PCI controller,
+	# but might be an old fashioned ISA controller; in which case
+	# we need to load ide-generic.
+	if [ ! -e "${ROOT}" -o "${ROOT}" = "/dev/root" ]; then
+	    /sbin/modprobe -Qb ide-generic
+	fi
+	;;
+
+scsi)
+	# If we're booting from SCSI we should have done all we need,
+	# now it's just a matter of waiting for the devices to appear
+	# which could take a while...
+	[ -e "${ROOT}" ] || log_begin_msg "Waiting for root file system"
+
+	if type usplash_write >/dev/null 2>&1; then
+	    usplash_write "TIMEOUT 30" || true
+	fi
+
+	slumber=300
+	while [ ${slumber} -gt 0 -a ! -e "${ROOT}" ]; do
+	    /bin/sleep 0.1
+	    slumber=$(( ${slumber} - 1 ))
+	done
+
+	if type usplash_write >/dev/null 2>&1; then
+	    usplash_write "TIMEOUT 15" || true
+	fi
+
+	if [ ${slumber} -gt 0 ]; then
+	    log_end_msg 0
+	else
+	    log_end_msg 1 || true
+	fi
+	;;
+esac
+;;