[devel] Re: label detection at boot time

[Vitaly Ostanin <vyt@vzljot.ru>]

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Anton Farygin пишет:

<skipped/>

> Рекомендую пересмотреть в корне схему добавления usbroot, написав скрипт
> в /etc/dev.d для блочных устройств.

Postinstall скрипт и системный скрипт из него в аттаче.

При загрузке виснет с kernel oops с упоминанием unionfs, очень
похож на тот oops, что я недавно присылал. Виснет после
добавления бранча на флешке для /etc, после этого реагирует
только на Alt+SysRq.

Livecd сделан из:
kernel-image-std26-up-2.6.11-alt8.i586.rpm
unionfs-utils-1.0.11-alt1.i586.rpm

<skipped/>

--
Regards, Vyt
mailto:  vyt@vzljot.ru
JID:     vyt@vzljot.ru

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cat <<E_O_F >> $ROOT/etc/uniontab
/etc
/home
/root
/var/mail
E_O_F

$in_chroot /bin/mkdir -p /etc/dev.d/block


cat <<E_O_F >> $ROOT/etc/dev.d/block/usbdrive.dev
#!/bin/sh -x
#
# USB drive hotplug agent for 2.6 kernels
#
#	ACTION=add
#	DEVPATH=/block/*
#

cd /etc/hotplug
. ./hotplug.functions

SourceIfNotEmpty /etc/sysconfig/hotplug

if [ "\$HOTPLUG" == "no" -o "\$USBPLUG" == "no" ];then
    exit 0
fi

STATEPATH=/var/lib/hotplug

UNIONTAB=/etc/uniontab
UNIONCTL=/usr/sbin/unionctl
MOUNT=/bin/mount
USBROOT=/media/storage_usbroot

[ -x \$UNIONCTL -a -x \$MOUNT ] || exit 1

function restart_services() {
    mesg "Restarting services with \"usbroot\" settings..."
    [ -s \$USBROOT/etc/sysconfig/clock ] && /sbin/service clock start
    [ -d \$USBROOT/etc/net ] && /sbin/service network restart
}

function add_unionfs_branches_to_usbroot() {
    mesg "Adding unionfs branches to \$USBROOT"
    grep -ve '^\(#\|\$\)' \$UNIONTAB |while read mntpt; do
        if [ -d \$mntpt ]; then
	    mkdir -p \$USBROOT/\$mntpt
	    mesg "Adding unionfs rw branch for \$mntpt to \$USBROOT/\$mntpt ..."
	    \$UNIONCTL \$mntpt --add --mode rw \$USBROOT/\$mntpt && \
	    mesg "Successfully added unionfs branch for \$mntpt" || \
	    mesg "Adding unionfs branch for \$mntpt failed."
	fi
	[ \$mntpt == /etc ] && restart_services
    done
}

function mount_usbroot() {
    /bin/mkdir \$USBROOT
    mesg "Trying to mount /dev/\$NAME to \$USBROOT ..."
    \$MOUNT /dev/\$NAME \$USBROOT -o sync && mesg "Successfully mounted." || exit 1
    mesg "Removing \$USBROOT/etc/mtab"
    rm -f \$USBROOT/etc/mtab
    if [ -s \$UNIONTAB ]; then
	add_unionfs_branches_to_usbroot
    fi
}

case \$ACTION in

add)
# FIXME: how to detect LABEL from udev (or HAL) ?
    NAME=\`udevinfo -q name -p \$DEVPATH\`
# FIXME: remove trailing space from blkid output ?
    LABEL=\`blkid /dev/\$NAME -s LABEL | cut -d '=' -f2\`
    [ \$LABEL == \"usbroot\" ] || exit 0
    mesg "Found label \$LABEL on \$DEVPATH"
    mount_usbroot
    exit 0
    ;;
remove)
# FIXME: udevinfo not works without device
    NAME=\`udevinfo -q name -p \$DEVPATH\`
    umount /dev/\$NAME
    exit 0
    ;;
*)
    debug_mesg USB drive \$ACTION event not supported
    exit 1
    ;;

esac

E_O_F

$in_chroot /bin/chmod 755 /etc/dev.d/block/usbdrive.dev

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#!/bin/sh -x
#
# USB drive hotplug agent for 2.6 kernels
#
#	ACTION=add
#	DEVPATH=/block/*
#

cd /etc/hotplug
. ./hotplug.functions

SourceIfNotEmpty /etc/sysconfig/hotplug

if [ "$HOTPLUG" == "no" -o "$USBPLUG" == "no" ];then
    exit 0
fi

STATEPATH=/var/lib/hotplug

UNIONTAB=/etc/uniontab
UNIONCTL=/usr/sbin/unionctl
MOUNT=/bin/mount
USBROOT=/media/storage_usbroot

[ -x $UNIONCTL -a -x $MOUNT ] || exit 1

function restart_services() {
    mesg "Restarting services with \"usbroot\" settings..."
    [ -s $USBROOT/etc/sysconfig/clock ] && /sbin/service clock start
    [ -d $USBROOT/etc/net ] && /sbin/service network restart
}

function add_unionfs_branches_to_usbroot() {
    mesg "Adding unionfs branches to $USBROOT"
    grep -ve '^\(#\|$\)' $UNIONTAB |while read mntpt; do
        if [ -d $mntpt ]; then
	    mkdir -p $USBROOT/$mntpt
	    mesg "Adding unionfs rw branch for $mntpt to $USBROOT/$mntpt ..."
	    $UNIONCTL $mntpt --add --mode rw $USBROOT/$mntpt && 	    mesg "Successfully added unionfs branch for $mntpt" || 	    mesg "Adding unionfs branch for $mntpt failed."
	fi
	[ $mntpt == /etc ] && restart_services
    done
}

function mount_usbroot() {
    /bin/mkdir $USBROOT
    mesg "Trying to mount /dev/$NAME to $USBROOT ..."
    $MOUNT /dev/$NAME $USBROOT -o sync && mesg "Successfully mounted." || exit 1
    mesg "Removing $USBROOT/etc/mtab"
    rm -f $USBROOT/etc/mtab
    if [ -s $UNIONTAB ]; then
	add_unionfs_branches_to_usbroot
    fi
}

case $ACTION in

add)
# FIXME: how to detect LABEL from udev (or HAL) ?
    NAME=`udevinfo -q name -p $DEVPATH`
# FIXME: remove trailing space from blkid output ?
    LABEL=`blkid /dev/$NAME -s LABEL | cut -d '=' -f2`
    [ $LABEL == \"usbroot\" ] || exit 0
    mesg "Found label $LABEL on $DEVPATH"
    mount_usbroot
    exit 0
    ;;
remove)
# FIXME: udevinfo not works without device
    NAME=`udevinfo -q name -p $DEVPATH`
    umount /dev/$NAME
    exit 0
    ;;
*)
    debug_mesg USB drive $ACTION event not supported
    exit 1
    ;;

esac


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