archlive_hook


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

# vim: set ft=sh:
run_hook ()
{
    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
    mkdir /tmpfs/bootcd
    msg "done."

    squashfound=0
    #TODO check for usb devices as well...
    msg -n ":: Scanning for boot cdrom device..."
    squashimg="/tmpfs/bootcd/archlive.sqfs"

    /bin/modprobe -q isofs >/dev/null 2>&1
    PS1="ramfs$ " /bin/sh -i
    for cdrom in /dev/cd/*; do
        if mount -r -t isofs "${cdrom}" /tmpfs/bootcd >/dev/null 2>&1; then
            if [ -e "${squashimg}" ]; then
                squashfound=1
                msg "${cdrom}"
                break
            fi
        else
            echo "Failed to mount ${cdrom}"
        fi
        [ ${squashfound} -eq 0 ] && umount /tmpfs/bootcd >/dev/null 2>&1
    done

    if [ ${squashfound} -eq 0 ]; then
        echo "ERROR: cannot find booted cdrom device, cannot continue..."
        exit 1
    fi

    if [ "${copytoram}" == "y" ]; then
        /bin/cat /tmpfs/bootcd/archlive.sqfs > /tmpfs/archlive.sqfs
        squashimg="/tmpfs/archlive.sqfs"
    fi

    msg -n ":: Mounting squashfs image..."
    /bin/modprobe -q squashfs >/dev/null 2>&1
    /bin/mkdir -p /tmpfs/squashfs_root
    if ! /bin/losetup /dev/loop0 "${squashimg}"; then
        echo "ERROR: Cannot mount loop device /dev/loop0...aborting"
        exit 1
    fi

    /bin/mount -r -t squashfs /dev/loop0 /tmpfs/squashfs_root
    msg "done."

    msg -n ":: Mounting root (union) filesystem..."
    /bin/modprobe -q unionfs >/dev/null 2>&1
    /bin/mount -t unionfs -o dirs=/tmpfs=rw:/tmpfs/squashfs_root=ro,debug=0 none /real_root
    msg "done."

    if [ -d /proc/sys/dev/cdrom ]; then
        echo 0 > /proc/sys/dev/cdrom/lock
        echo 1 > /proc/sys/dev/cdrom/autoeject
    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
    /bin/umount /dev
    exec /bin/run-init -c /dev/console /real_root /sbin/init ${CMDLINE}
}