blob: 60e14bffdc78de92675afdad83382c587aa424f7 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
|
# args: source, mountpoint
_mnt_bind()
{
msg "::: Binding ${1} to ${2}"
mkdir -p /real_root${2}
/bin/mount -o bind ${1} /real_root${2}
}
# args: image file
_mnt_squashfs()
{
msg "::: Adding new union branch: ${1}"
/bin/modprobe -q loop >/dev/null 2>&1
mkdir -p "/tmpfs/mnt/loop${LOOP_NUM}"
# sometimes it takes udev a while to create device nodes
until [ -e "/dev/loop${LOOP_NUM}" ]; do
sleep 1
done
if ! /bin/losetup "/dev/loop${LOOP_NUM}" ${1}; then
echo "ERROR: Cannot mount loop device /dev/loop${LOOP_NUM}"
break
fi
/bin/mount -r -t squashfs "/dev/loop${LOOP_NUM}" "/tmpfs/mnt/loop${LOOP_NUM}"
/bin/mount -t unionfs -o remount,add=:/tmpfs/mnt/loop${LOOP_NUM}=ro none "/real_root"
export LOOP_NUM=$(( $LOOP_NUM + 1 ))
}
run_hook ()
{
if [ "x${arch}" = "x" ]; then
arch="$(uname -m)"
fi
if [ "x${ramdisk_size}" = "x" ]; then
ramdisk_size="75%"
fi
msg -n ":: Mounting tmpfs, size=${ramdisk_size}..."
mount -t tmpfs -o "size=${ramdisk_size}" tmpfs /tmpfs
msg "done."
# external drives may need to settle
msg ":: Waiting for usb devices to settle..."
/sbin/udevadm trigger --subsystem-match=usb
/sbin/udevadm settle
msg ":: Scanning for boot device..."
/bin/mkdir -p /bootmnt
bootmnt="/bootmnt"
found=0
/bin/modprobe -q isofs >/dev/null 2>&1
msg ":: Scanning cd drives..."
for cdrom in /dev/hd[a-z] /dev/sr[0-9]* /dev/scd[a-z] /dev/sg[0-9]*; do
if mount -r -t iso9660 "${cdrom}" ${bootmnt} >/dev/null 2>&1; then
if [ -e "${bootmnt}/root-image.sqfs" ]; then
found=1
msg "${cdrom}"
break
fi
else
echo "Failed to mount ${cdrom}"
fi
[ ${found} -eq 0 ] && umount ${bootmnt} >/dev/null 2>&1
done
if [ ${found} -eq 0 ]; then
msg ":: Scanning usb drives..."
for usb in /dev/sd[a-z][0-9]; do
if mount -r -t vfat "${usb}" ${bootmnt} >/dev/null 2>&1 ||\
mount -r -t ext2 "${usb}" ${bootmnt} >/dev/null 2>&1; then
if [ -e "${bootmnt}/root-image.sqfs" ]; then
found=1
msg "${usb}"
break
fi
else
echo "Failed to mount ${usb}"
fi
[ ${found} -eq 0 ] && umount ${bootmnt} >/dev/null 2>&1
done
fi
if [ ${found} -eq 0 ]; then
echo "ERROR: cannot find boot device, cannot continue..."
echo " Falling back to interactive prompt"
PS1="ramfs$ " /bin/sh -i
exit 1
fi
base_img="${bootmnt}/root-image.sqfs"
if [ "${copytoram}" = "y" ]; then
msg ":: Copying squashfs image to RAM"
/bin/cat ${base_img} > /tmpfs/root-image.sqfs
base_img="/tmpfs/root-image.sqfs"
fi
/bin/modprobe -q squashfs >/dev/null 2>&1
msg ":: Mounting root (union) filesystem"
/bin/modprobe -q unionfs >/dev/null 2>&1
/bin/mount -t unionfs -o dirs=/tmpfs=rw none /real_root
export LOOP_NUM="0"
if [ -e "/mounts" ]; then
msg ":: Mounting images"
while read img imgarch mountpoint type; do
# check if this line is a comment (starts with #)
[ "${img#"#"}" != "${img}" ] && continue
[ "$imgarch" != "$arch" ] && continue
if [ "${type}" = "bind" ]; then
_mnt_bind ${img} ${mountpoint}
elif [ "${type}" = "squashfs" ]; then
_mnt_squashfs "${img}"
fi
done < /mounts
else
msg ":: No mountable images found"
fi
# layer the "pristine" base system image last
_mnt_squashfs ${base_img}
if [ -d /proc/sys/dev/cdrom ]; then
echo 0 > /proc/sys/dev/cdrom/lock
echo 0 > /proc/sys/dev/cdrom/autoeject
fi
if [ "${break}" = "y" ]; then
echo ":: Break requested, type 'exit' to resume operation"
echo " NOTE: klibc contains no 'ls' binary, use 'echo *' instead"
PS1="ramfs$ " /bin/sh -i
fi
udevpid=$(/bin/minips -C udevd -o pid=)
[ "x${udevpid}" != "x" ] && /bin/kill -9 $udevpid 2>&1 >/dev/null
#Yep, we're bailing out here. We don't need kinit.
msg ":: Passing control to Archlinux Initscripts...Please Wait"
/bin/umount /sys
/bin/umount /proc
exec /bin/run-init -c /dev/console /real_root /sbin/init ${CMDLINE}
}
# vim:ft=sh:ts=4:sw=4:et:
|