blob: eb8b91832fa3c0c6c92771bb6063b7211359869e (
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
147
148
149
150
151
152
153
154
155
156
|
# This file contains common functions used in init and in hooks
msg () {
[ "${quiet}" != "y" ] && echo $@
}
err () {
echo "ERROR: $@"
}
poll_device() {
local device=$1 seconds=${2//[!0-9]}
[ -z "$seconds" ] && seconds=5
[ -b "$device" ] && return 0
if [ "$udevd_running" -eq 1 ]; then
msg "Waiting $seconds seconds for device $device ..."
while [ ! -b "$device" -a "$seconds" -gt 0 ]; do
sleep 1
seconds=$(( $seconds - 1 ))
done
fi
[ -b "$device" ]
}
launch_interactive_shell() {
export PS1='[ramfs \W]\$ '
[ "$1" = "--exec" ] && exec sh -i
sh -i
}
major_minor_to_device() {
local dev
[ -e "/sys/dev/block/$1:$2" ] || return 1
if dev=$(readlink -f "/sys/dev/block/$1:$2" 2>/dev/null); then
echo "/dev/${dev##*/}"
return 0
fi
return 1
}
parse_cmdline() {
local w in_quotes lhs rhs
in_quotes=0
for w in $(cat /proc/cmdline); do
if [ ${in_quotes} -eq 0 ]; then
case "${w}" in
\#*) break ;; # ignore everything after a # in the commandline
# The kernel passes those to init on its own
[0123456Ss]) ;;
single) ;;
rw|ro) rwopt="$w" ;;
# only export stuff that does work with ash :)
=*) ;;
*=*) rhs=${w#*=}
lhs=${w%%=*}
lhs=${lhs//[-.]/_}
if [ '"' = "${rhs:0:1}" ]; then
if [ "${rhs:$((${#rhs}-1))}" = '"' ]; then
rhs="${rhs:1:$((${#rhs}-2))}"
else
rhs="${rhs:1}"
in_quotes=1
continue
fi
fi
[ "$lhs" = "${lhs//[^0-9a-zA-Z]}" ] && [ "$lhs" = "${lhs#[0-9]}" ] && eval ${lhs}=\${rhs}
;;
*) lhs=${w//[-.]/_}
[ "$lhs" = "${lhs//[^0-9a-zA-Z]}" ] && [ "$lhs" = "${lhs#[0-9]}" ] && eval ${lhs}=y
;;
esac
else
if [ '"' = "${w:$((${#w}-1))}" ]; then
rhs="${rhs} ${w%\"}"
in_quotes=0
[ "$lhs" = "${lhs//[^0-9a-zA-Z]}" ] && [ "$lhs" = "${lhs#[0-9]}" ] && eval ${lhs}=\${rhs}
else
rhs="${rhs} ${w}"
fi
fi
done
}
resolve_device() {
local major minor dev device=$1
case $device in
# resolve tag name to block device
UUID=*|LABEL=*)
dev=$(blkid -lt "$device" -o device)
[ -n "$device" ] && device=$dev
;;
esac
case $device in
/dev/*)
if poll_device "$device" "$rootdelay"; then
echo "$device"
return 0
fi
# block device, e.g. (/dev/sda1) -> /sys/class/block/sda1/dev
if [ -e /sys/class/block/${device:5}/dev ]; then
IFS=':' read major minor < "/sys/class/block/${device:5}/dev"
fi
;;
[0-9a-fA-F][0-9a-fA-F][0-9a-fA-F]|[0-9a-fA-F][0-9a-fA-F][0-9a-fA-F][0-9a-fA-F])
# hex encoded major/minor, such as from LILO
major=$(( 0x0$device >> 8 ))
minor=$(( 0x0$device & 0xff ))
;;
0x[0-9a-fA-F][0-9a-fA-F]*)
major=$(( $device >> 8 ))
minor=$(( $device & 0xff ))
;;
esac
if [ -n "$major" -a -n "$minor" ]; then
device=$(major_minor_to_device "$major" "$minor" || echo '/dev/root')
if [ ! -b "$device" ]; then
msg "Creating device node with major $major and minor $minor." >&2
mknod "$device" b "$major" "$minor"
fi
echo "$device"
return 0
fi
return 1
}
default_mount_handler() {
local rootdev
if ! rootdev=$(resolve_device "$root"); then
err "Unable to determine major/minor number of root device '$root'."
echo "You are being dropped to a recovery shell"
echo " Type 'exit' to try and continue booting"
launch_interactive_shell
msg "Trying to continue (this will most likely fail) ..."
fi
if ! mount ${fstype:+-t $fstype} -o ${rwopt:-ro}${rootflags:+,$rootflags} "$rootdev" "$1"; then
echo "You are now being dropped into an emergency shell."
launch_interactive_shell
msg "Trying to continue (this will most likely fail) ..."
fi
}
# vim: set ft=sh ts=4 sw=4 et:
|
