summaryrefslogtreecommitdiff
path: root/initramfs-init
blob: 8996f23035a2c375ef4f08767bc47a692159498c (plain) (blame)
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
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
#!/bin/sh

VERSION=1.9.1-pre0
NEWROOT=/newroot
SINGLEMODE=no

# basic environment
export PATH=/usr/bin:/bin:/usr/sbin:/sbin

# basic mounts
mount -t proc -o noexec,nosuid,nodev proc /proc
mount -t sysfs -o noexec,nosuid,nodev sysfs /sys

# some helpers
ebegin() {
	echo -n " * $*: "
}
eend() {
	local msg
	if [ "$1" = 0 ] || [ $# -lt 1 ] ; then
		echo "ok."
	else
		shift
		echo "failed. $*"
		echo "initramfs emergency recovery shell launched"
		exec /bin/busybox sh
	fi
}

scan_drivers() {
	if [ "$AUTODETECT" != no ] ; then
		find /sys -name modalias | xargs sort | while read a ; do
			modprobe $a 2>/dev/null \
				|| echo $a >> /tmp/hwdrivers.failed
		done
	fi
}

find_ovl() {
	local mnt="$1"
	local ovl
	local lines

	# look for apkovl's on mounted media
	ovl=$( ls -1 "$mnt"/*.apkovl.tar.gz* 2>/dev/null ) || return 1
	lines=$(echo "$ovl" | wc -l)

	if [ $lines -gt 1 ] ; then
		echo "ERROR: More than one apkovl file was found on $(basename $mnt). None will be read." >&2
		return 1
	fi
	echo "$ovl"
}

# gotta start from somewhere :)
echo "Starting Alpine $VERSION"

# read the kernel options
for i in `cat /proc/cmdline` ; do
	case $i in
		s|single|1)
			SINGLEMODE=yes ;;
		modules=*)
			MODULES="`echo ${i#modules=} | tr ',' ' '`";;
		noautodetect)
			AUTODETECT=no;;
		*=*)    eval KOPT_$i ;;
		*)      eval KOPT_$i=yes ;;
	esac
done

ALPINE_DEV=${KOPT_alpine_dev%%:*}
ALPINE_MNT=/media/$ALPINE_DEV

# hide kernel messages
dmesg -n 1

# setup /dev
ebegin "Starting mdev"
mount -t tmpfs -o exec,nosuid,mode=0755 mdev /dev
mknod -m 666 /dev/null c 1 3
ln -s sr0 /dev/cdrom
echo "/sbin/mdev" > /proc/sys/kernel/hotplug
mdev -s
RC=$?
[ -d /dev/pts ] || mkdir -m 755 /dev/pts
[ -c /dev/ptmx ] || mknod -m 666 /dev/ptmx c 5 2
mount -t devpts -o gid=5,mode=0620,noexec,nosuid devpts /dev/pts
[ -d /dev/shm ] || mkdir /dev/shm
mount -t tmpfs -o nodev,nosuid,noexec shm /dev/shm
eend $RC

/bin/sh
# load available drivers to get access to modloop media
ebegin "Loading boot drivers"
[ "$MODULES" ] && modprobe $MODULES 2> /dev/null
if [ -f /etc/modules ] ; then
	sed 's/\#.*//g' < /etc/modules |
	while read module args; do
		modprobe -q $module $args
	done
fi
scan_drivers
scan_drivers
eend 0

# locate boot media and mount it
ebegin "Mounting boot media"
mount $ALPINE_MNT >/dev/null 2>&1
eend $?
ebegin "Mounting loopback device for kernel modules"
modprobe loop
mount -o loop,ro -t cramfs /media/$ALPINE_DEV/$(dirname ${KOPT_BOOT_IMAGE:-""})/modloop.cmg /.modloop
rc=$?
if [ "$rc" = 0 ]; then
	rm -rf /lib/modules
	ln -sf /.modloop/modules /lib
fi
if [ -d $ALPINE_MNT/firmware ]; then
	mkdir -p /lib/firmware
	cp -a $ALPINE_MNT/firmware/* /lib/firmware/
fi
eend $?

# early console?
if [ "$SINGLEMODE" = "yes" ]; then
	echo "Entering single mode. Type 'exit' to continue booting."
	sh
fi

# more drivers
ebegin "Loading hardware drivers"
scan_drivers
eend 0

# look for apkovl
for i in usb floppy cdrom; do
	mount /media/$i 2>/dev/null || continue
	ovl=$(find_ovl /media/$i)
	[ -f "$ovl" ] && break
	umount /media/$i 2>/dev/null
done

if [ -f "$ovl" ]; then
	ebegin "Loading user settings from $ovl"
	tar -C $NEWROOT -zxf "$ovl"
	eend $?
	umount /media/$i 2>/dev/null
	pkgs=$(sed 's/\#.*//' $NEWROOT/etc/lbu/packages.list 2>/dev/null)
fi

# install new root
ebegin "Installing packages to root filesystem"
mount -t tmpfs -o size=50M tmpfs $NEWROOT
apk create --root /newroot
apk add --root /newroot --repository /media/cdrom/apks --quiet --progress $pkgs
eend $?

# switch over to new root
cat /proc/mounts | while read DEV DIR TYPE OPTS ; do
	if [ "$DIR" != "/" -a "$DIR" != "$NEWROOT" -a -d "$DIR" ]; then
		mkdir -p $NEWROOT/$DIR
		mount -o move $DIR $NEWROOT/$DIR
	fi
done
sync

if [ -x $NEWROOT/sbin/init ]; then
	exec /bin/busybox switch_root $NEWROOT /sbin/init $KOPT_init_args
fi

echo "initramfs emergency recovery shell launched"
exec /bin/busybox sh
reboot