summaryrefslogtreecommitdiffstats
path: root/init
blob: f242dc19a8b28ae98664432f4910cbc25a724c38 (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
157
#!/bin/busybox ash
# Install busybox's applets as symlinks
/bin/busybox --install -s

. /init_functions

msg ":: Loading Initramfs"
/bin/mount -t proc proc /proc -o nosuid,noexec,nodev
/bin/mount -t sysfs sys /sys -o nosuid,noexec,nodev
if grep -q devtmpfs /proc/filesystems 2>/dev/null; then
  /bin/mount -n -t devtmpfs udev /dev -o mode=0755,size=10M,nosuid
else
  /bin/mount -n -t tmpfs udev /dev -o mode=0755,size=10M,nosuid
  # We don't have devtmpfs, so add the most important standard devices
  /bin/mknod /dev/null c 1 3
  /bin/mknod /dev/zero c 1 5
  /bin/mknod /dev/console c 5 1
  # /dev/mem is needed if we want to load uvesafb before triggering uevents
  /bin/mknod /dev/mem c 1 1
fi

read CMDLINE </proc/cmdline

root=""
init=""
echo "/sbin/modprobe" > /proc/sys/kernel/modprobe

# set default mount handler
mount_handler="default_mount_handler"

# if available, start udevd at this stage
if [ -x /sbin/udevd ]; then
    msg ":: Starting udevd..."
    echo > /proc/sys/kernel/hotplug
    /sbin/udevd --daemon --resolve-names=never
    udevd_running=1
    msg "done."
else
    udevd_running=0
fi

for cmd in ${CMDLINE}; do
    case "${cmd}" in
        \#*) break ;; # ignore everything after a # in the commandline
        # The kernel passes those to the kernel on its own
        [0123456Ss]) ;;
        [0-9]*) ;;
        single) ;;
        rw) readwrite="yes" ;;
        ro) readwrite="no" ;;
        # only export stuff that does work with ash :)
        *=*) rhs="$(echo "${cmd}" | cut -d= -f2-)"
             cmd="$(echo "${cmd}" | cut -d= -f1 | sed 's|\.|_|g')"
             cmd="$(echo "${cmd}" | sed 's|-|_|g')=\"${rhs}\""
             (echo "${cmd}" | grep -qe '^[0-9]') || eval "${cmd}"
             ;;
        *)   cmd="$(echo "${cmd}" | sed 's|\.|_|g')"
             cmd="$(echo "${cmd}" | sed 's|-|_|g')"
             (echo "${cmd}" | grep -qe '^[0-9]') || eval "${cmd}=y"
             ;;
    esac
done

if [ -n "${disablehooks}" ]; then
    for d in $(echo "${disablehooks}" | sed 's|,| |g'); do
        eval "hook_${d}=disabled"
    done
fi

if [ -n "${disablemodules}" ]; then
    for d in $(echo "${disablemodules}" | sed 's|,| |g'); do
        eval "mod_${d}=disabled"
    done
fi

if [ -n "${earlymodules}" ]; then
    for m in $(echo "${earlymodules}" | sed 's|,| |g'); do
        /sbin/modprobe -q ${m} > /dev/null 2>&1
    done
fi

. /config

for m in ${MODULES}; do
    TST=""
    eval "TST=\$mod_${m}"
    if [ "${TST}" != "disabled" ]; then
        /sbin/modprobe -q ${m} > /dev/null 2>&1
    fi
done

# If rootdelay is empty or not a non-negative integer, set it to 10
if [ -z "${rootdelay}" ] || ! [ "${rootdelay}" -ge 0 ]; then
    rootdelay=10
fi

if [ -e "/hooks" ]; then
    for h in ${HOOKS}; do
        TST=""
        eval "TST=\$hook_${h}"
        if [ "${TST}" != "disabled" ]; then
            run_hook () { msg "${h}: no run function defined"; }
            if [ -e "/hooks/${h}" ]; then
               . /hooks/${h}
               msg ":: Running Hook [${h}]"
               run_hook
            fi
        fi
    done
fi

if [ "${break}" = "y" ]; then
    echo ":: Break requested, type 'exit' to resume operation"
    launch_interactive_shell
fi

if [ -f "/message" ]; then
    msg "$(cat /message)"
fi

# Mount root at /new_root
mkdir -p /new_root
${mount_handler} /new_root

[ -z "${init}" ] && init="/sbin/init"
if [ "$(stat -c %D /)" = "$(stat -c %D /new_root)" ]; then
    # Nothing got mounted on /new_root. This is the end, we don't know what to do anymore
    # We fall back into a shell, but the shell has now PID 1
    # This way, manual recovery is still possible.
    err "Failed to mount the real root device."
    echo "Bailing out, you are on your own. Good luck."
    echo
    launch_interactive_shell --exec
elif [ ! -x "/new_root${init}" ]; then
    # Successfully mounted /new_root, but ${init} is missing
    # The same logic as above applies
    err "Root device mounted successfully, but ${init} does not exist."
    echo "Bailing out, you are on your own. Good luck."
    echo
    launch_interactive_shell --exec
fi

#Special handling if udev is running
udevpid=$(/bin/pidof udevd)
if [ -n "${udevpid}" ]; then
    # Settle pending uevents, then kill udev
    /sbin/udevadm settle
    /bin/kill ${udevpid} > /dev/null 2>&1
    while /bin/pidof udevd >/dev/null; do
        sleep 0.1
    done
fi

mount --move /proc /new_root/proc
mount --move /sys /new_root/sys
mount --move /dev /new_root/dev
exec /sbin/switch_root -c /dev/console /new_root ${init} "$@"