N900 rescue OS - testing release - Page 8 - maemo.org

maurochiado | # 71 | 2013-09-09, 13:50 | Report

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

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Estel | # 72 | 2013-09-09, 15:53 | Report

Originally Posted by maurochiado View Post

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:
(...)
debugfs -w -R “feature ^needs_recovery” /dev/mmcblk0p2

rootfs doesn't have anything to do with /dev/mmcblk0p2, or with journals, for that matter. Rootfs is ubifs, so trying any ext* tools on it would be futile.

I guess, hoever, that you're talking about OptFS, which indeed, is /dev/mmcblk0p2. But, busybox-power doesn't have anything to do with it, it goes into rootfs. Not that bb-power caused any such problems to anyone, ever

/Estel

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maurochiado | # 73 | 2013-09-09, 16:29 | Report

Originally Posted by Estel View Post

rootfs doesn't have anything to do with /dev/mmcblk0p2, or with journals, for that matter. Rootfs is ubifs, so trying any ext* tools on it would be futile.

I guess, hoever, that you're talking about OptFS, which indeed, is /dev/mmcblk0p2. But, busybox-power doesn't have anything to do with it, it goes into rootfs. Not that bb-power caused any such problems to anyone, ever

/Estel

Thank you Estel!
Maybe the issue arose from a number of problems, even prior to the update. What I know is, before that particular update, the OS was working ok. And the commands I reported allowed me to, for example, be able to delete conversation again, or run apt-get update/ugrade.

Anyway, now it's a matter of resolving the reboot loop. Is there any log saved upon bootup I can check from rescueOS?
Is there any file where (for example) mount options could be messed up?

Thanks again!

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viktor80 | # 74 | 2013-11-21, 10:49 | Report

Hello!

First of all, thanks for making this, today i was not able to turn on my lovely device, and finally after some hours of research i fond this topic.

The wiki page on how to use it is a bit unclear tough, it should be stated more precise that you have two ways to use rescueOS. Luckily someone on irc channel told me i have to download the kernel file even if i am using the .img version. I am not a pro linux user but not even a noob now, and it was not clear.

Anyways, how can i see if the battery is charging? And how long do i have to wait 'till i can boot it up normally? I am still afraid a bit if it will work... Since few minutes on charging atm, its showing an increase in voltage, zero level.

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NIN101 | # 75 | 2013-11-21, 16:55 | Report

Originally Posted by

The wiki page on how to use it is a bit unclear tough, it should be stated more precise that you have two ways to use rescueOS.

The wiki page is outdated. I edited it now. The official documentation can be found here: https://raw.github.com/NIN101/N900_R...umentation.txt

Originally Posted by

Anyways, how can i see if the battery is charging?

Read the output of the script.

Originally Posted by

And how long do i have to wait 'till i can boot it up normally?

I assume you mean booting Maemo. It all depends - I don't have any numbers.

Also note that it isn't my charging script and it's stated everywhere that if you want to use, you do it on your own risk.

I am not qualified to answer technical questions about the charge21 script and can not give support on it (and shouldn't), sorry. You would probably have more luck in the #maemo IRC Channel.

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viktor80 | # 76 | 2013-11-21, 19:55 | Report

Yes, i have read that, again from irc someone told me i can pull off the phone from pc and i have to put in on wall charger before using script, for more energy. After that charging was clearly noticeable, but i had to restart the whole procedure.

Had to reflash anyways, my system got corrupted, i guess the frequent restarts because of the low battery power.

Even if its not your script, since its on the img, it'd be nice if the wiki would be more accurate with the whole procedure. It saved my phone so i am really glad that i found this, and that on irc there were people who helped more.

Thanks again.

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NIN101 | # 77 | 2015-05-31, 15:18 | Report

After almost 2 years, a new version (1.2) is available. For changes, take a look at the changelog. Download it here.

Edit: 1.3 with a minor fix (telnetd auto start): https://n900.quitesimple.org/rescueOS/rescueOS-1.3/

Last edited by NIN101; 2016-11-04 at 22:28.

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xes | # 78 | 2015-05-31, 19:31 | Report

Nice! ...but i'm still hoping you would include midnight commander again..

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Halftux | # 79 | 2015-06-02, 11:16 | Report

I am wondering if there is a possibility to change the keyboard layout to another language.
It is not a knock-out criterion but would be nice to have for writing things before connecting with telnet.

Anyway it working like a charm thanks.

NotMicro | # 80 | 2015-12-21, 13:46 | Report

I used rescueOS and it works! Many, many thanks !! I have a question: is there any chance to uninstall f-cam drivers after mounting maemo root?