maemo.org - Talk - N900 rescue OS

Hello all,

I would like to ask you all some directions in using rescueOS to rescue a N900 stuck in a reboot loop after a number of problems.

As I posted here http://talk.maemo.org/showpost.php?p...48&postcount=8 I faced a readonly rootfs after an update (busybox possibly).
I figured ou the problem was with the filesystem journal, so I used the following directions taken from an Ubuntu blog:

Code:

Before you remove the journal, you need to remove the needs_recovery flag from the volume.  You’d think this is possible with tune2fs, but it doesn’t seem so.  So you do it with debugfs:

debugfs -w -R “feature ^needs_recovery” /dev/mmcblk0p2



Then remove the journal, forcibly:

tune2fs -f -O ^has_journal /dev/mmcblk0p2

The problem was gone, even though dumpe2fs was still reporting filesystem problems.
But then I completely lost my mind by issuing:

Code:

Nokia-N900-42-11:~# apt-get upgrade

and then rebooted. I know it was a big mistake, but now it's too late.
(PS I have the full text of this command)

I would like to know whether there is a chance to know where the system hangs. I'm in no hurry to fix the issue, and I would like to avoid a reflash, taking the opportunity to improve my command line skills.

So I started using rescueOS, accessing the device via telnet.
Is there any bootup log I can check?

I'm used to save each and every command I issue (I usually save the whole Cygwin window cache) and I can provide system responses, if any of you could help me!

Ps I checked a couple of files which got changed by the upgrade command..

Here is one of mount-opts:

Code:

~$ nano /mnt/maemo/etc/default/mount-opts

# !!! Do not edit this file. It can be overwritten in next update !!!

# !!! Instead create and edit file /etc/default/mount-opts-overwrite !!!



# Options for mounting all filesystems

common_opts="noatime,nodiratime"



# Options for mounting root's filesystems (/, /home)

root_opts="errors=continue,commit=1,data=writeback"



# Options for mounting user's filesystems (MyDocs, SD cards, ...)

user_opts="noauto,nodev,exec,nosuid"



# Options for swap partitions

swap_opts=""



# Options for different filesystems

vfat_opts="utf8,uid=29999,shortname=mixed,dmask=000,fmask=0000,rodir"

ntfs_opts="nls=utf8,uid=29999,umask=0000"



# Renerate fstab at boot time in /etc/event.d/rcS-late

genfstab="1"



# When generating fstab add also swap partitions from SD card (if exists)

swap_sd="0"



# Call fsck -p for /home at boot time in /etc/event.d/rcS-late

home_fsck="0"



# Call fsck -p for user's partitions (MyDocs, SD cards, ...)

user_fsck="0"



# Include overwrite file

if [ -f /etc/default/mount-opts-overwrite ]; then

And here is rcS-late:

Code:

~$ cat /mnt/maemo/etc/event.d/rcS-late

description "late rcS actions"



start on started hal

stop on stopping hal



console none



script

    #mount /home; fix filesystem and retry mounting if 1st attempt fails

    mount_home ()

    {

    if ! grep -q -E '^\s*[^\s]+\s+/home\s' /etc/fstab; then

      # /home is not in fstab so is part of rootfs and already mounted

      return 0

    fi

    if [ "$home_fsck" != "0" ]; then

      echo "`date +'%Y-%m-%d %H:%M:%S'`  fsck -a /home" >> /var/log/fsck_home.log

      fsck -a /home >> /var/log/fsck_home.log 2>&1 || true

      echo "" >> /var/log/fsck_home.log

    fi

    /bin/mount /home && grep -q '^[^\ ]* /home [^\ ]* [^\ ]*rw.*' /proc/mounts

    if [ $? -eq 0 ]

    then

      return 0

    else

      grep -q '^[^\ ]* /home [^\ ]* [^\ ]*ro.*' /proc/mounts

      if [ $? -eq 0 ]

      then

        umount /home

      fi

      echo "`date +'%Y-%m-%d %H:%M:%S'`  fsck -y /home" >> /var/log/fsck_home.log

      fsck -y /home >> /var/log/fsck_home.log 2>&1 || true

      echo "" >> /var/log/fsck_home.log

      sync

      /bin/mount /home && grep -q '^[^\ ]* /home [^\ ]* [^\ ]*rw.*' /proc/mounts

      return $?

    fi

    }



    ACT_DEAD=0

    HOME_MOUNTED=0



    #check act_dead

    if [ -e /tmp/ACT_DEAD ]; then

      ACT_DEAD=1

    fi



    # Backup old fsck logs, max size is 512kB

    if [ -e /var/log/fsck.log ]; then

        FSCK_SIZE=`du -sk /var/log/fsck.log | cut -f1`

        if [ $FSCK_SIZE -ge 512 ]; then

            mv /var/log/fsck.log /var/log/fsck.log.old || true

        fi

    fi

    if [ -e /var/log/fsck_home.log ]; then

        FSCK_HOME_SIZE=`du -sk /var/log/fsck_home.log | cut -f1`

        if [ $FSCK_HOME_SIZE -ge 512 ]; then

            mv /var/log/fsck_home.log /var/log/fsck_home.log.old || true

        fi

    fi



    # Load fstab and mount options

    . /etc/default/mount-opts || true



    if [ ! -e /etc/fstab ] || [ "$genfstab" != "0" ]; then



      fstab=/etc/fstab

      tmp_fstab=/tmp/fstab



      # Find internal eMMC device, fallback to mmcblk0

      for emmc in mmcblk1 mmcblk0; do

        if [ ! -e /dev/$emmc ]; then continue; fi

        device=`stat /dev/$emmc | sed -n 's/.*Device type: //p'`

        major=`echo $device | sed 's/,.*//'`

        minor=`echo $device | sed 's/.*,//'`

        major=$((0x$major))

        minor=$((0x$minor))

        if grep -q internal /sys/dev/block/$major:$minor/device/../slot_name; then

          break

        fi

      done



      # Check if / is on ubi

      if grep -q '^ubi0:rootfs / ubifs' /proc/mounts; then

        root_is_ubi=1

      else

        root_is_ubi=0

      fi



      # MyDocs will be first eMMC partition, /home will be second

      mydocs=/dev/${emmc}p1

      home=/dev/${emmc}p2



      mydocs_type=`blkid -c /dev/null -o value -s TYPE $mydocs`

      home_type=`blkid -c /dev/null -o value -s TYPE $home`



      [ -z "$mydocs_type" ] && mydocs_type=vfat;

      [ -z "$home_type" ] && home_type=ext3;



      swap_opts="sw,$swap_opts"



      eval mydocs_opts=$common_opts,$user_opts,\$${mydocs_type}_opts

      eval home_opts=$common_opts,$root_opts,\$${home_type}_opts



      # Remove duplicate commas from variables

      mydocs_opts=`echo $mydocs_opts | sed ':l;s/,,/,/g;tl;s/^,//;s/,$//'`

      home_opts=`echo $home_opts | sed ':l;s/,,/,/g;tl;s/^,//;s/,$//'`

      swap_opts=`echo $swap_opts | sed ':l;s/,,/,/g;tl;s/^,//;s/,$//'`



      [ -z "$mydocs_opts" ] && mydocs_opts=defaults

      [ -z "$home_opts" ] && home_opts=defaults



      swaps=`blkid -c /dev/null -o device -t TYPE=swap`



      if [ "$swap_sd" = "0" ]; then

        swaps=`echo $swaps | tr ' ' '\n' | grep $emmc || true`

      fi



      # Generate fstab

      rm -f $tmp_fstab

      echo "# This file was generated by script /etc/event.d/rcS-late" >> $tmp_fstab

      echo "# !!! Do not edit this file. It will be overwritten in next device startup !!!" >> $tmp_fstab

      echo "# If you want static /etc/fstab add genfstab=\"0\" to file /etc/default/mount-opts-overwrite" >> $tmp_fstab



      # /

      grep '^[^\ ]* / ' /proc/mounts >> $tmp_fstab || true



      # /home

      if [ $root_is_ubi -eq 1 ]; then

        echo "$home /home $home_type $home_opts 0 2" >> $tmp_fstab

      fi



      # /opt

      if [ $root_is_ubi -eq 1 ] || [ ! -e /opt ] || [ -d /opt -a -z "`ls -A /opt`" ]; then

        echo "/home/opt /opt none bind 0 0" >> $tmp_fstab

      fi



      # /home/user/MyDocs

      echo "$mydocs /home/user/MyDocs $mydocs_type $mydocs_opts 0 2" >> $tmp_fstab



      # swap

      for dev in $swaps; do

        echo "$dev none swap $swap_opts 0 0" >> $tmp_fstab

      done



      cmp -s $tmp_fstab $fstab || cp $tmp_fstab $fstab

      rm -f $tmp_fstab



    fi



    if [ $ACT_DEAD -eq 0 ]; then

      /sbin/swapon -a || echo "Failed to enable paging partition."

      # Setup lowmem module

      echo 32768  > /proc/sys/vm/lowmem_deny_watermark_pages || true

      echo 98304  > /proc/sys/vm/lowmem_notify_high_pages || true

      echo 131072 > /proc/sys/vm/lowmem_notify_low_pages || true

      echo 1024   > /proc/sys/vm/lowmem_nr_decay_pages || true

      # Exclude some UIDs from memory allocation denial.

      # 30000 is messagebus, 30001 could be used by Matchbox

      echo "30000 30001 30002 30003" > /proc/sys/vm/lowmem_allowed_uids || true

    fi



    mount_home && HOME_MOUNTED=1



    # If failed to mount /home and system has been already optified - reboot

    if [ $HOME_MOUNTED -eq 0 ]

    then

      if [ -e /var/lib/maemo-optify-firstboot-do-not-clean-home-opt ]; then

        telinit 6

      fi

    else

      [ ! -d /home/opt ] && mkdir /home/opt

      [ ! -d /opt ] && mkdir /opt

    fi



    if [ $ACT_DEAD -eq 0 ]

    then

      if [ $HOME_MOUNTED -eq 1 ]

      then

        if [ -x /usr/sbin/maemo-optify-firstboot.sh ]; then

            . /usr/sbin/maemo-optify-firstboot.sh

        fi

      fi

    fi



    /bin/mount /opt || echo "Failed to mount(bind) /opt."



    if [ $ACT_DEAD -eq 0 ]

    then

      if [ $HOME_MOUNTED -eq 1 ]

      then

        if [ -x /usr/sbin/maemo-optify-auto-opt.sh ]; then

            . /usr/sbin/maemo-optify-auto-opt.sh

        fi

      fi



      if [ -d /home/preinstalled -a -d /home/user ]

      then

        rm -rf /home/user

      fi



      if [ ! -d /home/user ]

      then

        if [ -d /home/preinstalled ]

        then

          mv /home/preinstalled /home/user

        else

          mkdir /home/user

        fi

        cd /etc/skel

        cp -a . /home/user

        chown -R user:users /home/user

        sync

      fi

    fi



    if [ ! -d /home/user ]

    then

      mkdir /home/user

      chown user:users /home/user

      sync

    fi



    # We can safely continue booting now.

    initctl emit MOUNTS_OK



    # Adjust flushing of memory card buffers

    echo 40 > /proc/sys/vm/dirty_ratio

    echo 10 > /proc/sys/vm/dirty_background_ratio



    # Initialize PRNG pool with the HW RNG. Slow, but that's ok.

    URANDOM_POOLSZ=512

    if [ -e /dev/hwrng ]; then

      RANDOM=/dev/hwrng

    elif [ -e /dev/hw_random ]; then

      RANDOM=/dev/hw_random

    fi

    if [ -e "$RANDOM" ]; then

      echo "Seeding entropy pool"

      dd if=$RANDOM of=/dev/urandom bs=$URANDOM_POOLSZ count=1

    fi



    # Data for the panic info driver

    mount -t debugfs nodev /sys/kernel/debug

    if modprobe panic_info_buff; then

      OSSO_VERSION="$(osso-product-info 2>/dev/null || true)"

      CSSU_VERSION="CSSU_VERSION='$(dpkg-query -W -f \${Version} mp-fremantle-community-pr 2>/dev/null || echo '<unknown>')'"

      KERNEL_VERSION="KERNEL_VERSION='$(uname -a 2>/dev/null || echo '<unknown>')'"

      sleep 1

      printf "%s\n%s\n%s" "$OSSO_VERSION" "$CSSU_VERSION" "$KERNEL_VERSION" > /sys/kernel/debug/panic_info_buff || true

    fi

end script



normal exit 0

Is there any chance to fix the bootup by replacing the old files?

Thanks in advance!
M
;);););)