mkinitrd-magellan/livecd/linuxrc.sh

#!/bin/sh
# $Id$

# loads given kernel modules
load_kernel_modules()
{
	local type="$1"
	local module
	local args
	
	echo -e "-- Loading ${type} modules:"
	( cat /etc/modules.${type}; echo) | while read module args
	do
		case "${module}" in
			\#*|"") continue ;;
		esac

		if [ -e /lib/${module}.ko ]
		then
			insmod -f /lib/${module}.ko ${args} > /dev/null 2>&1
			[ $? -eq 0 ] && echo -e "--      ${module}"
		fi
	done
	echo
}

# check_drives $devices $fstype
check_drives()
{
	local devices="$1"
	local fs="$2"

	for dev in ${devices}
	do
		mount -t ${fs} ${dev} /sysroot/mnt/cdrom >/dev/null 2>&1
		media_found=$?

		# if mount was ok check if cdid exists
		if [ "${media_found}" -eq 0 ]
		then
			[ -e /sysroot/mnt/cdrom/livecdrootfs.sqsh ] && media_id_ok=$?
			umount /sysroot/mnt/cdrom
	
			if [ "${media_id_ok}" -eq 0 ]
			then
				echo -e "Magellan boot device found."
				BOOT_DEVICE="${dev}"
				FSTYPE="${fs}"
				break
			fi
		fi
	done
}

## some defaults ##
DOSCSI=no
DOUSB=no
DOSATA=yes
DOFB=no
DOPATA=yes
FORCED_ROOTFS=""
INITEXEC="/sbin/init"
BREAK_ENABLED=no
UNIONFS=no
UNIONFS_FILE=""
CLOOPMOUNTDIR="/sysroot/mnt/cloop"

## starts here ##

# mount essential filesystems
mount -t proc proc /proc
mount -t sysfs sysfs /sys
mount -t tmpfs tmpfs /dev -o rw,mode=0644,size=1024

# install all busybox applets
busybox --install -s

# silencio
echo 0 > /proc/sys/kernel/printk

# check command line for params
for i in $(cat /proc/cmdline)
do
	case "${i}" in
		doscsi) DOSCSI=yes;;
		noscsi) DOSCSI=no;;
		dousb) DOUSB=yes;;
		nousb) DOUSB=no;;
		dosata) DOSATA=yes ;;
		nosata) DOSATA=no ;;
		dofb) DOFB=yes;;
		nofb) DOFB=no;;
		dopata) DOPATA=yes;;
		nopata) DOPATA=no;;
		rootfs=*) FORCED_ROOTFS="${i#*=}";;
		init=*) INITEXEC="${i#*=}";;
		break) BREAK_ENABLED=yes ;;
		unionfs) UNIONFS=yes;;
		unionfs_file=*) UNIONFS_FILE="${i#*=}";;
		rootdelay=*) ROOTDELAY="${i#*=}";;
	esac
done

# now load all needed modules
[ "${DOFB}" = "yes" ] && load_kernel_modules "framebuffer"
load_kernel_modules "generic"
[ "${DOPATA}" = "yes" ] && load_kernel_modules "pata"
[ "${DOSCSI}" = "yes" ] && load_kernel_modules "scsi"
[ "${DOUSB}" = "yes" ] && load_kernel_modules "usb"
[ "${DOSATA}" = "yes" ] && load_kernel_modules "sata"

# populate dev
mdev -s
# handle hotplug events properly
echo /sbin/mdev > /proc/sys/kernel/hotplug

# create newroot mount point
mkdir -p /sysroot
# fake a new filesystem (also needed with an initramfs!!)
mount -t tmpfs tmpfs /sysroot

mkdir -p /sysroot/mnt/cdrom
mkdir -p /sysroot/mnt/cloop
mkdir -p /sysroot/mnt/magellan


# needed for the usbstick, the timeout maybe to short
if [ "${DOUSB}" = "yes" ]; then
	echo "-- Waiting 8 seconds for possible usb mount ..."
	sleep 8
fi

# respect rootdelay kernel param
if [ ! -z "${ROOTDELAY}" ]; then
	echo "-- Requested a rootdelay of ${ROOTDELAY} seconds ..."
	sleep ${ROOTDELAY}
fi

# searching cdrom with cdid
BOOT_DEVICE=""
FSTYPE=""

echo "Searching for a boot device ..."

# searching usbstick
if [ "${DOUSB}" = "yes" ]; then
	ROOTFS="vfat"
	[[ ! -z ${FORCED_ROOTFS} ]] && ROOTFS="${FORCED_ROOTFS}"
	check_drives "/dev/sd*" "${ROOTFS}"
	check_drives "/dev/sg*" "${ROOTFS}"
fi

# for cdrom_device in $CDROM_LIST (ide)
ROOTFS="iso9660"
[[ ! -z ${FORCED_ROOTFS} ]] && ROOTFS="${FORCED_ROOTFS}"
check_drives "/dev/cdroms/*" "${ROOTFS}"
check_drives "/dev/hd*" "${ROOTFS}"

# scsi cdroms
if [ "${DOSCSI}" = "yes" ] || [ "${DOSATA}" = "yes" ]; then
	ROOTFS="iso9660"
	[[ ! -z ${FORCED_ROOTFS} ]] && ROOTFS="${FORCED_ROOTFS}"
	check_drives "/dev/sr*" "${ROOTFS}"
	check_drives "/dev/sg*" "${ROOTFS}"
	check_drives "/dev/scd*" "${ROOTFS}"
fi

# mount our rootfs from cdrom
if [ "${BOOT_DEVICE}" = "" ]
then
	echo "No Magellan boot CD/USBStick found!!!"
	ash
	exit 1
else
	echo -e "Booting from: $BOOT_DEVICE ..."
	mount -o ro -t "${FSTYPE}" "${BOOT_DEVICE}" /sysroot/mnt/cdrom >/dev/null 2>&1

	# write our boot_device to /mnt/.bootdev for later use (mtab)
	echo "BOOTDEV=${BOOT_DEVICE}" > /sysroot/.bootdev
	echo "FSTYPE=${FSTYPE}" >> /sysroot/.bootdev

	# mount squashfs
	echo -e "Mounting squashfs system image ..."
	echo
	[ ! -e /dev/loop0 ] && mknod /dev/loop0 b 7 0
	mount -o loop,ro -t squashfs /sysroot/mnt/cdrom/livecdrootfs.sqsh "${CLOOPMOUNTDIR}"

	# mount unionfs if enabled
	if [[ ${UNIONFS} = yes ]]
	then
		echo -e "Mounting writeable cdbuffer (unionfs) ..."
	
		# default setting
		CLOOPMOUNTDIR="/sysroot/mnt/unionfs"
		[[ -z ${UNIONFS_FILE} ]] && UNIONFS_FILE="/sysroot/mnt/cdrom/unionfs"

		[[ ! -d /sysroot/mnt/unionfs ]] && install -d /sysroot/mnt/unionfs
		mount -t unionfs dirs=${UNIONFS_FILE}=rw:/sysroot/mnt/cloop=ro ${CLOOPMOUNTDIR}
	fi

	# symlinking cloop rootfs to /mnt as newroot
	cd /sysroot

	for x in bin sbin lib lib64 boot usr opt
	do
		[ -d ${CLOOPMOUNTDIR/\/sysroot\//}/${x} ] && ln -s ${CLOOPMOUNTDIR/\/sysroot\//}/${x} ${x}
	done
	mkdir -p initrd proc tmp sys var/tmp dev media

	# use devtmpfs if supported
	if [ "$(grep devtmpfs /proc/filesystems | cut -d$'\t' -f2)" = "devtmpfs" ]
	then
		mount -t devtmpfs dev /sysroot/dev
	else
		# make /sysroot/dev/console & /mnt/dev/null
		[ ! -e /sysroot/dev/console ] && mknod -m 600 /sysroot/dev/console c 5 1
		[ ! -e /sysroot/dev/null ] && mknod -m 666 /sysroot/dev/null c 1 3
		# only to be safe and to have a log channel
		[ ! -e /sysroot/dev/tty ] && mknod /sysroot/dev/tty c 5 0
		# busybox needs this one
		[ ! -e /sysroot/dev/tty5 ] && mknod /sysroot/dev/tty5 c 4 5
	fi

	(cd ${CLOOPMOUNTDIR}; cp -a etc root home var /sysroot)

	# ensure that /sysroot/linurc exists
	[ ! -e /sysroot/linuxrc ] && ln -snf ${INITEXEC} /sysroot/linuxrc

	# ensure the right permissions
	chmod 1777 /sysroot/tmp
	chmod 1777 /sysroot/var/tmp
fi

cd /

# unset hotplug event-manager
echo > /proc/sys/kernel/hotplug

# de-silencio
echo 3 > /proc/sys/kernel/printk

if [[ ${BREAK_ENABLED} = yes ]]
then
	echo "-- Break requested, type 'exit' to resume operation ..."
	ash
fi

echo "-- Switching to real sysroot ..."
umount /dev
umount /sys
umount /proc

exec run-init /sysroot ${INITEXEC} $@ </sysroot/dev/console >/sysroot/dev/console
1	#!/bin/sh
2	# $Id$
3
4	# loads given kernel modules
5	load_kernel_modules()
6	{
7	local type="$1"
8	local module
9	local args
10
11	echo -e "-- Loading ${type} modules:"
12	( cat /etc/modules.${type}; echo) \| while read module args
13	do
14	case "${module}" in
15	\#*\|"") continue ;;
16	esac
17
18	if [ -e /lib/${module}.ko ]
19	then
20	insmod -f /lib/${module}.ko ${args} > /dev/null 2>&1
21	[ $? -eq 0 ] && echo -e "-- ${module}"
22	fi
23	done
24	echo
25	}
26
27	# check_drives $devices $fstype
28	check_drives()
29	{
30	local devices="$1"
31	local fs="$2"
32
33	for dev in ${devices}
34	do
35	mount -t ${fs} ${dev} /sysroot/mnt/cdrom >/dev/null 2>&1
36	media_found=$?
37
38	# if mount was ok check if cdid exists
39	if [ "${media_found}" -eq 0 ]
40	then
41	[ -e /sysroot/mnt/cdrom/livecdrootfs.sqsh ] && media_id_ok=$?
42	umount /sysroot/mnt/cdrom
43
44	if [ "${media_id_ok}" -eq 0 ]
45	then
46	echo -e "Magellan boot device found."
47	BOOT_DEVICE="${dev}"
48	FSTYPE="${fs}"
49	break
50	fi
51	fi
52	done
53	}
54
55	## some defaults ##
56	DOSCSI=no
57	DOUSB=no
58	DOSATA=yes
59	DOFB=no
60	DOPATA=yes
61	FORCED_ROOTFS=""
62	INITEXEC="/sbin/init"
63	BREAK_ENABLED=no
64	UNIONFS=no
65	UNIONFS_FILE=""
66	CLOOPMOUNTDIR="/sysroot/mnt/cloop"
67
68	## starts here ##
69
70	# mount essential filesystems
71	mount -t proc proc /proc
72	mount -t sysfs sysfs /sys
73	mount -t tmpfs tmpfs /dev -o rw,mode=0644,size=1024
74
75	# install all busybox applets
76	busybox --install -s
77
78	# silencio
79	echo 0 > /proc/sys/kernel/printk
80
81	# check command line for params
82	for i in $(cat /proc/cmdline)
83	do
84	case "${i}" in
85	doscsi) DOSCSI=yes;;
86	noscsi) DOSCSI=no;;
87	dousb) DOUSB=yes;;
88	nousb) DOUSB=no;;
89	dosata) DOSATA=yes ;;
90	nosata) DOSATA=no ;;
91	dofb) DOFB=yes;;
92	nofb) DOFB=no;;
93	dopata) DOPATA=yes;;
94	nopata) DOPATA=no;;
95	rootfs=) FORCED_ROOTFS="${i#=}";;
96	init=) INITEXEC="${i#=}";;
97	break) BREAK_ENABLED=yes ;;
98	unionfs) UNIONFS=yes;;
99	unionfs_file=) UNIONFS_FILE="${i#=}";;
100	rootdelay=) ROOTDELAY="${i#=}";;
101	esac
102	done
103
104	# now load all needed modules
105	[ "${DOFB}" = "yes" ] && load_kernel_modules "framebuffer"
106	load_kernel_modules "generic"
107	[ "${DOPATA}" = "yes" ] && load_kernel_modules "pata"
108	[ "${DOSCSI}" = "yes" ] && load_kernel_modules "scsi"
109	[ "${DOUSB}" = "yes" ] && load_kernel_modules "usb"
110	[ "${DOSATA}" = "yes" ] && load_kernel_modules "sata"
111
112	# populate dev
113	mdev -s
114	# handle hotplug events properly
115	echo /sbin/mdev > /proc/sys/kernel/hotplug
116
117	# create newroot mount point
118	mkdir -p /sysroot
119	# fake a new filesystem (also needed with an initramfs!!)
120	mount -t tmpfs tmpfs /sysroot
121
122	mkdir -p /sysroot/mnt/cdrom
123	mkdir -p /sysroot/mnt/cloop
124	mkdir -p /sysroot/mnt/magellan
125
126
127	# needed for the usbstick, the timeout maybe to short
128	if [ "${DOUSB}" = "yes" ]; then
129	echo "-- Waiting 8 seconds for possible usb mount ..."
130	sleep 8
131	fi
132
133	# respect rootdelay kernel param
134	if [ ! -z "${ROOTDELAY}" ]; then
135	echo "-- Requested a rootdelay of ${ROOTDELAY} seconds ..."
136	sleep ${ROOTDELAY}
137	fi
138
139	# searching cdrom with cdid
140	BOOT_DEVICE=""
141	FSTYPE=""
142
143	echo "Searching for a boot device ..."
144
145	# searching usbstick
146	if [ "${DOUSB}" = "yes" ]; then
147	ROOTFS="vfat"
148	[[ ! -z ${FORCED_ROOTFS} ]] && ROOTFS="${FORCED_ROOTFS}"
149	check_drives "/dev/sd*" "${ROOTFS}"
150	check_drives "/dev/sg*" "${ROOTFS}"
151	fi
152
153	# for cdrom_device in $CDROM_LIST (ide)
154	ROOTFS="iso9660"
155	[[ ! -z ${FORCED_ROOTFS} ]] && ROOTFS="${FORCED_ROOTFS}"
156	check_drives "/dev/cdroms/*" "${ROOTFS}"
157	check_drives "/dev/hd*" "${ROOTFS}"
158
159	# scsi cdroms
160	if [ "${DOSCSI}" = "yes" ] \|\| [ "${DOSATA}" = "yes" ]; then
161	ROOTFS="iso9660"
162	[[ ! -z ${FORCED_ROOTFS} ]] && ROOTFS="${FORCED_ROOTFS}"
163	check_drives "/dev/sr*" "${ROOTFS}"
164	check_drives "/dev/sg*" "${ROOTFS}"
165	check_drives "/dev/scd*" "${ROOTFS}"
166	fi
167
168	# mount our rootfs from cdrom
169	if [ "${BOOT_DEVICE}" = "" ]
170	then
171	echo "No Magellan boot CD/USBStick found!!!"
172	ash
173	exit 1
174	else
175	echo -e "Booting from: $BOOT_DEVICE ..."
176	mount -o ro -t "${FSTYPE}" "${BOOT_DEVICE}" /sysroot/mnt/cdrom >/dev/null 2>&1
177
178	# write our boot_device to /mnt/.bootdev for later use (mtab)
179	echo "BOOTDEV=${BOOT_DEVICE}" > /sysroot/.bootdev
180	echo "FSTYPE=${FSTYPE}" >> /sysroot/.bootdev
181
182	# mount squashfs
183	echo -e "Mounting squashfs system image ..."
184	echo
185	[ ! -e /dev/loop0 ] && mknod /dev/loop0 b 7 0
186	mount -o loop,ro -t squashfs /sysroot/mnt/cdrom/livecdrootfs.sqsh "${CLOOPMOUNTDIR}"
187
188	# mount unionfs if enabled
189	if [[ ${UNIONFS} = yes ]]
190	then
191	echo -e "Mounting writeable cdbuffer (unionfs) ..."
192
193	# default setting
194	CLOOPMOUNTDIR="/sysroot/mnt/unionfs"
195	[[ -z ${UNIONFS_FILE} ]] && UNIONFS_FILE="/sysroot/mnt/cdrom/unionfs"
196
197	[[ ! -d /sysroot/mnt/unionfs ]] && install -d /sysroot/mnt/unionfs
198	mount -t unionfs dirs=${UNIONFS_FILE}=rw:/sysroot/mnt/cloop=ro ${CLOOPMOUNTDIR}
199	fi
200
201	# symlinking cloop rootfs to /mnt as newroot
202	cd /sysroot
203
204	for x in bin sbin lib lib64 boot usr opt
205	do
206	[ -d ${CLOOPMOUNTDIR/\/sysroot\//}/${x} ] && ln -s ${CLOOPMOUNTDIR/\/sysroot\//}/${x} ${x}
207	done
208	mkdir -p initrd proc tmp sys var/tmp dev media
209
210	# use devtmpfs if supported
211	if [ "$(grep devtmpfs /proc/filesystems \| cut -d$'\t' -f2)" = "devtmpfs" ]
212	then
213	mount -t devtmpfs dev /sysroot/dev
214	else
215	# make /sysroot/dev/console & /mnt/dev/null
216	[ ! -e /sysroot/dev/console ] && mknod -m 600 /sysroot/dev/console c 5 1
217	[ ! -e /sysroot/dev/null ] && mknod -m 666 /sysroot/dev/null c 1 3
218	# only to be safe and to have a log channel
219	[ ! -e /sysroot/dev/tty ] && mknod /sysroot/dev/tty c 5 0
220	# busybox needs this one
221	[ ! -e /sysroot/dev/tty5 ] && mknod /sysroot/dev/tty5 c 4 5
222	fi
223
224	(cd ${CLOOPMOUNTDIR}; cp -a etc root home var /sysroot)
225
226	# ensure that /sysroot/linurc exists
227	[ ! -e /sysroot/linuxrc ] && ln -snf ${INITEXEC} /sysroot/linuxrc
228
229	# ensure the right permissions
230	chmod 1777 /sysroot/tmp
231	chmod 1777 /sysroot/var/tmp
232	fi
233
234	cd /
235
236	# unset hotplug event-manager
237	echo > /proc/sys/kernel/hotplug
238
239	# de-silencio
240	echo 3 > /proc/sys/kernel/printk
241
242	if [[ ${BREAK_ENABLED} = yes ]]
243	then
244	echo "-- Break requested, type 'exit' to resume operation ..."
245	ash
246	fi
247
248	echo "-- Switching to real sysroot ..."
249	umount /dev
250	umount /sys
251	umount /proc
252
253	exec run-init /sysroot ${INITEXEC} $@ </sysroot/dev/console >/sysroot/dev/console