Develop Bugs

Can't mount /system as read-write

Hello folks,
on my HTC Desire with OpenDesire 3.5.2 I'm trying to install the dropbear ssh-deamon according to a german tutorial (I'm not allowed to put the link here... ).
It is on www and then android-hilfe.de and then, go /root-hacking-modding-fuer-motorola-milestone/14241-per-ssh-auf-den-milestone.html
I'm connected to the phone using adb and shell'd into.
Now, they say that I have to mount /system as read-write to put a file (dropbear) into /system/bin. The command is
Code:
mount -o remount,rw /dev/block/mtdblock3 /system
and results in no errors. mount then says:
Code:
rootfs on / type rootfs (ro,relatime)
tmpfs on /dev type tmpfs (rw,relatime,mode=755)
devpts on /dev/pts type devpts (rw,relatime,mode=600)
proc on /proc type proc (rw,relatime)
sysfs on /sys type sysfs (rw,relatime)
none on /acct type cgroup (rw,relatime,cpuacct)
tmpfs on /mnt/asec type tmpfs (rw,relatime,mode=755,gid=1000)
none on /dev/cpuctl type cgroup (rw,relatime,cpu)
/dev/block/mtdblock3 on /system type yaffs2 (rw,relatime)
/dev/block/mtdblock5 on /data type yaffs2 (rw,nosuid,nodev,relatime)
/dev/block/mtdblock4 on /cache type yaffs2 (rw,nosuid,nodev,relatime)
/sys/kernel/debug on /sys/kernel/debug type debugfs (rw,relatime)
/dev/block/vold/179:1 on /mnt/sdcard type vfat (rw,dirsync,nosuid,nodev,noexec,relatime,uid=1000,gid=1015,fmask=0702,dmask=0702,allow_utime=0020,codepage=cp437,iocharset=iso8859-1,shortname=mixed,utf8,errors=remount-ro)
/dev/block/vold/179:1 on /mnt/secure/asec type vfat (rw,dirsync,nosuid,nodev,noexec,relatime,uid=1000,gid=1015,fmask=0702,dmask=0702,allow_utime=0020,codepage=cp437,iocharset=iso8859-1,shortname=mixed,utf8,errors=remount-ro)
tmpfs on /mnt/sdcard/.android_secure type tmpfs (ro,relatime,size=0k,mode=000)
so in my opinion, /system shoult be writable.
But everything I try results in an "Out of memory" error: Creating directories, copying files - anything.
Only deleting files is possible: I backed-up and then deleted some ringtones from /system/media/audio/ringtones, and I'm also not able to copy the backup of them I did before onto the sdcard back into the directory again
I read in another thread, that the error "Out of memory" itself is a bug and should mean "No permission". But why don't I have permission?
df -h gives me
Code:
Filesystem Size Used Available Use% Mounted on
tmpfs 203.4M 0 203.4M 0% /dev
tmpfs 203.4M 0 203.4M 0% /mnt/asec
/dev/block/mtdblock3 250.0M 106.4M 143.6M 43% /system
/dev/block/mtdblock5 147.6M 53.9M 93.8M 36% /data
/dev/block/mtdblock4 40.0M 1.1M 38.9M 3% /cache
/dev/block/vold/179:1
3.7G 2.9G 744.3M 80% /mnt/sdcard
/dev/block/vold/179:1
3.7G 2.9G 744.3M 80% /mnt/secure/asec
so there definitively IS enough memory for a 720kB file.
Any ideas?

You can only write to system on the desire via adb from recovery.

If above post didn't explain it enough...
There is no write access to /system partition yet, except via a overlay file system. Have a search and you'll find, like everybody else.

thank you! Yes, that is the problem. I read this also somewhere, but didn't remember it.

I still cant write files even though im in recovery?

zoltrix said:
I still cant write files even though im in recovery?
Click to expand...
Click to collapse
Type "adb remount"
(Without "")

zHk3R said:
Type "adb remount"
(Without "")
Click to expand...
Click to collapse
Im trying to relfash my recovery and i keep getting the no space issue.
If i type in adb remount, i can no longer mount my sd card that is holding my image..
http://forum.xda-developers.com/showthread.php?t=805141
EDIT: If i figure out how to s-off my phone, will that fix it?

zoltrix said:
Im trying to relfash my recovery and i keep getting the no space issue.
If i type in adb remount, i can no longer mount my sd card that is holding my image..
http://forum.xda-developers.com/showthread.php?t=805141
EDIT: If i figure out how to s-off my phone, will that fix it?
Click to expand...
Click to collapse
Just follow the thread in Desire Android Development and you'll have S-OFF easy.
PRO TIP: Use a flash drive rather than burning the .iso on a CD.

Yea but, will i need s-off to flash this recovery?
I know s-off lets you do stuff within fastboot, but im not too sure what taht really means

zoltrix said:
Yea but, will i need s-off to flash this recovery?
I know s-off lets you do stuff within fastboot, but im not too sure what taht really means
Click to expand...
Click to collapse
nevermind, ive done my research and s-off fixed my problem!

details
could you please describe in a little bit more details how you have managed to write the /system mount point ?
thanks in advance ...
btw, there are o bunch of guys that want this answer

What? and Why?
I too would like to know more about writing to /system.
adb remount appears to switch the mount point from "ro" to "rw" (as shown with mount command) but I still get the same "Read-only file system" response when I try to adb push files.
What exactly is the issue here? Is it related to S-ON / S-OFF ?
What do I have to do to be able to write to /system?
(other than reboot into recovery; when I copy files in Recovery, they are gone after a normal reboot)
Thanks

[Fixed] Editing /system/customize

Hi!
I can't edit or push anything in/to /system/customize.
I want to push widget.txt (Power Controls) in there but it won't work.
I tried Root Explorer as well as adb.
When I edit the existing file and save it the file just disappears.
When I overwrite the preexisting file, the preexisting is being deleted but the other file never appears.
I also can't create a file or a folder.
Anybody knows what the problem is?
My Desire is running with Leedroid 2.4 btw. And yes I mount it and Root Explorer has su rights.
Sent from my HTC Desire using Tapatalk

You need to be s-off to be able to write to the system partition while booted. If you don't know if you are s-off then you aren't. Best is to use adb while in recovery.
Sent from my HTC Desire using XDA Premium App

I know that I'm not s-off. I didn't know that you need to be s-off to be able to write to /system/.
I didn't say so anywhere, everywhere you ask for help, it just says "push the file via Root Explorer, that easy".
Must have been punk'd.
I tried with adb, didn't seem to work.
Guess I made something wrong.
I'll try again.
Edit:
"adb remount" gives me the following error:
"remount failed: Unknown error: 0"
Don't know that means, adb devices says that my device is connected.
Any thoughts?
adb devices:
D:\Documents and Settings\Administrator>adb devices
* daemon not running. starting it now on port 5037 *
* daemon started successfully *
List of devices attached
HT03ZPL12245 recovery
D:\Documents and Settings\Administrator>adb shell mount
rootfs on / type rootfs (rw,relatime)
tmpfs on /dev type tmpfs (rw,relatime,mode=755)
devpts on /dev/pts type devpts (rw,relatime,mode=600)
proc on /proc type proc (rw,relatime)
sysfs on /sys type sysfs (rw,relatime)
/dev/block/mtdblock4 on /cache type yaffs2 (rw,nodev,noatime,nodiratime)

Solution for "remount failed: Unknown error: 0":
Mount in the recovery menu.
Thxbb

nexus with broken file system, cannot wipe

Hi everybody,
I'm in deep troubles with my nexus (maguro).
Yesterday, it started to reboot after showing for about 5-10 seconds the lock screen.
the phone is rooted, Iand the last rom (cyanogenmod) was running stable in the last 6 months.
twrp 2.8.0.1 was installed, so I Rebooted to fastboot to flash the 2.8.6.0.
And then the weird part begins:
it's like every partition is read only, but from the mount command it doesn't look like it.
flashing the new recovery is a success, but after reboot the 2.8.0.1 is still there.
factory reset successful, and everything is like before.
wiping sdcard, nothing happens.
if I try to create a backup in twrp, it fails after 20 seconds or so. (I've copied everything to the pc using the pull command in adb).
Try to fix or to change the partitions filesystem in twrp doesn't change anything.
I tried also to change the file system in parted, through the adb shell,this happens:
Code:
~ # ←[6nparted /dev/block/mmcblk0p12 mkfs ext2
parted /dev/block/mmcblk0p12 mkfs ext2
Warning: The existing file system will be destroyed and all data on the
partition will be lost. Do you want to continue?
parted: invalid token: ext2
Yes/No? yes
yes
yes
Partition number? 1
1
1
File system type? [ext2]?
Error: File system was not cleanly unmounted! You should run e2fsck. Modifying
an unclean file system could cause severe corruption.
Ignore/Cancel? i
i
i
Error: File system has an incompatible feature enabled. Compatible features are
has_journal, dir_index, filetype, sparse_super and large_file. Use tune2fs or
debugfs to remove features.
You found a bug in GNU Parted! Here's what you have to do:
Don't panic! The bug has most likely not affected any of your data.
Help us to fix this bug by doing the following:
Check whether the bug has already been fixed by checking
the last version of GNU Parted that you can find at:
...
Please check this version prior to bug reporting.
If this has not been fixed yet or if you don't know how to check,
please visit the GNU Parted website:
...
for further information.
Your report should contain the version of this release (1.8.8.1.179-aef3)
along with the error message below, the output of
parted DEVICE unit co print unit s print
and the following history of commands you entered.
Also include any additional information about your setup you
consider important.
Error: SEGV_MAPERR (Address not mapped to object)
Aborted
and of course nothing changes.
so, I have access to adb in recovery and to fastboot, there is a way to wipe completely the filesystem and start from scratch, or load a different kernel, that would help?
If I send with adb push a new rom to the sdcard, twrp fails and at the next reboot the files disappear.
this is my mount result:
Code:
~ # ←[6nmount
mount
rootfs on / type rootfs (rw)
tmpfs on /dev type tmpfs (rw,seclabel,nosuid,relatime,mode=755)
devpts on /dev/pts type devpts (rw,seclabel,relatime,mode=600)
proc on /proc type proc (rw,relatime)
sysfs on /sys type sysfs (rw,seclabel,relatime)
selinuxfs on /sys/fs/selinux type selinuxfs (rw,relatime)
tmpfs on /tmp type tmpfs (rw,seclabel,relatime)
/dev/block/mmcblk0p11 on /cache type ext4 (rw,seclabel,relatime,user_xattr,barri
er=1,data=ordered)
/dev/block/mmcblk0p12 on /data type ext4 (rw,seclabel,relatime,user_xattr,barrie
r=1,data=writeback)
/dev/block/mmcblk0p12 on /sdcard type ext4 (rw,seclabel,relatime,user_xattr,barr
ier=1,data=writeback)
/dev/block/mmcblk0p10 on /system type ext4 (rw,seclabel,relatime,user_xattr,barr
ier=1,data=ordered)
and remounting in rw the partitions has no effect.
Even the parted, e2fsck, etc files disappear from /sbin after each reboot.
thank you
edit:
Having a second nexus, I could take a look at the partitions, and the difference seems to be the data=writeback options.
I'm looking for a procedure to make them "ordered" as the other phone.
edit2:
Code:
/tmp # ←[6ntune2fs -l /dev/block/mmcblk0p12 | grep features
tune2fs -l /dev/block/mmcblk0p12 | grep features
__bionic_open_tzdata: couldn't find any tzdata when looking for localtime!
__bionic_open_tzdata: couldn't find any tzdata when looking for GMT!
__bionic_open_tzdata: couldn't find any tzdata when looking for posixrules!
Filesystem features: has_journal ext_attr resize_inode filetype needs_recov
ery extent sparse_super large_file
/tmp # ←[6ne2fsck -f /dev/block/mmcblk0p12
e2fsck -f /dev/block/mmcblk0p12
e2fsck 1.42.9 (28-Dec-2013)
/dev/block/mmcblk0p12: recovering journal
Superblock needs_recovery flag is clear, but journal has data.
Run journal anyway<y>? y
y
yes
e2fsck: unable to set superblock flags on /dev/block/mmcblk0p12
/dev/block/mmcblk0p12: ********** WARNING: Filesystem still has errors *********
*
/tmp #
/tmp # ←[6ntune2fs -O ^has_journal /dev/block/mmcblk0p12
tune2fs -O ^has_journal /dev/block/mmcblk0p12
tune2fs 1.42.9 (28-Dec-2013)
The needs_recovery flag is set. Please run e2fsck before clearing
the has_journal flag.
Stuck here at the moment, cannot set superblock flags..
edit3:
Tested every possible superblock position, no luck.
I'm starting to think that the internal memory could be dead, but the phone in fastboot and recovery mode works fine.
I forgot to say that I've tried also the fastboot -w command, it works a lot (about 270 seconds) but no effect.

KF2 Soft brick - /data and /sdcard read-only

My mom has a Kindle 2nd Generation running 10.5.1 stock.
The other day, it started rebooting, but not in the traditional bootloop sense. The OS would load to the lock screen, you could swipe and use it (albeit sluggishly) for approximately 30 seconds before it rebooted again. So, it made it impossible to access the device via ADB.
I made a factory cable, accessed fastboot, and did the following:
fastboot -i 0x1949 flash bootloader otter2-u-boot-prod-10.2.4.bin
fastboot -i 0x1949 flash recovery otter2-twrp-2.6.3.1-recovery.img
fastboot -i 0x1949 flash boot otter2-freedom-boot-10.4.6.img
(if using a fastboot USB cable, swap to a normal USB cable before entering the next command)
fastboot -i 0x1949 oem recovery
Click to expand...
Click to collapse
This worked fine. I was able to get into recovery mode with TWRP and access ADB. I pulled all the data off the /sdcard partition. This was a big concern since my mom has been using this thing for a couple years now and she's collected quite a bit. Originally, my directive was to factory reset and reflash the stock firmware from Amazon: update-kindle-10.5.1_user_5174820.bin. It would be nice if they supplied a checksum, but they don't apparently.
Anyway, the more I thought about it, I thought I could clear some caches, uninstall some apks and that would resolve the issue without a new system image. Then I started to notice the problem:
~ # df -h
Filesystem Size Used Available Use% Mounted on
tmpfs 336.6M 136.0K 336.5M 0% /dev
/dev/block/mmcblk0p13
5.6G 4.8G 755.9M 87% /data
/dev/block/mmcblk0p13
5.6G 4.8G 755.9M 87% /sdcard
/dev/block/mmcblk0p12
639.8M 11.0M 628.8M 2% /cache
~ # mount
rootfs on / type rootfs (rw)
tmpfs on /dev type tmpfs (rw,seclabel,nosuid,relatime,mode=755)
devpts on /dev/pts type devpts (rw,seclabel,relatime,mode=600)
proc on /proc type proc (rw,relatime)
sysfs on /sys type sysfs (rw,seclabel,relatime)
selinuxfs on /sys/fs/selinux type selinuxfs (rw,relatime)
/dev/block/mmcblk0p13 on /data type ext4 (ro,seclabel,relatime,user_xattr,barrier=1,data=ordered)
/dev/block/mmcblk0p13 on /sdcard type ext4 (ro,seclabel,relatime,user_xattr,barrier=1,data=ordered)
/dev/block/mmcblk0p12 on /cache type ext4 (rw,seclabel,relatime,user_xattr,barrier=1,data=ordered)
~ #
Click to expand...
Click to collapse
Both /data and /sdcard are read-only. They also use the same block device. Maybe that's normal? I've already tried remounting the partitions read-write to no avail.
mount -o rw,remount /sdcard
mount -o rw,remount /data
Click to expand...
Click to collapse
Both commands execute as if they were accepted successfully (ala no output). However, rechecking mount's output, shows no change. It's still read-only.
I've tried sideloading in TWRP, but that resulted in a protocol fault. Also through TWRP, the factory reset succeeds, but actually does nothing. All of the data is still there. My other idea is to push the image onto the /cache partition (there's just enough room), and try to install that way, but I have a feeling that 1) won't work and 2) may exacerbate problems.
I'm stuck. Anyone have any ideas?

Solved
I was able to free the partitions.
fastboot -i 0x1949 erase userdata
Click to expand...
Click to collapse
It must have been some sort of corruption in userspace. I had previously tried a wipe through TWRP which was claimed to be successful. I still can't determine if TWRP doesn't check all their syscalls and handle the return codes or the Linux subsystem in Android is the root of the bugs. Either way, upon reboot, the device returned to factory "out of box" state.

Question I think I messed up my B Slot Partition(s)

I have a Poco F3 Global, and I currently am running TWRP 3.5.2_11-Nebrassy.
If I tap Reboot and it shows my Current Slot as A, then under Mount I see the following:
System, system_ext, Product, Vendor, ODM, Metadata, Data, Cust, and Firmware
And I can check each of them. I can also perform Wipe -> Format Data -> yes.
But if I boot into Slot B, and tap Mount it doesn't let me click the checkmarks for System, system_ext, Product, or Vendor.
And if I try to execute Wipe -> Format Data -> yes it shows "Failed to mount" in red for all of the following:
'/system_root', '/system_ext', '/product', '/vendor' (Invalid argument)
(Some of them are in there multiple times)
Running cat /etc/fstab in B outputs:
Code:
/dev/block/sda18 /metadata ext4 rw 0 0
/dev/block/sda35 /data f2fs rw 0 0
/dev/block/sda29 /cust ext4 rw 0 0
/dev/block/bootdevice/by-name/modem_b /firmware vfat rw 0 0
/dev/block/sda22 /persist ext4 rw 0 0
/usb_otg vfat rw 0 0
Running cat /etc/fstab in A outputs:
Code:
/dev/block/dm-2 /system_root ext4 ro 0 0
/dev/block/dm-3 /system_ext ext4 ro 0 0
/dev/block/dm-1 /product ext4 ro 0 0
/dev/block/dm-4 /vendor ext4 ro 0 0
/dev/block/dm-0 /odm ext4 ro 0 0
/dev/block/sda18 /metadata ext4 rw 0 0
/dev/block/sda35 /data f2fs rw 0 0
/dev/block/sda29 /cust ext4 rw 0 0
/firmware vfat rw 0 0
/dev/block/sda22 /persist ext4 rw 0 0
/usb_otg vfat rw 0 0
For both A and B going to Wipe -> Advanced Wipe it only shows Dalvik / ART Cache, Metadata, Data, Internal Storage, and USB-OTG
I can still install an OS, but that is finicky at times.
How can I fix my B Partition?

Solved it:
Download the MiFlash Tool, and the Fastboot version of the Stock ROM. Extract the contents of the zip (and within the zip the tar file) to a directory without spaces in it (I just extracted it directly to C: drive). Open MiFlash, click Select and choose the directory you just extracted. At the bottom of the MiFlash app select "Clean All", NOT "Clean all and Lock" (unless that's what you want). Click Refresh (if phone doesn't appear, make sure your phone is in fastboot mode and connected to PC). Then click Flash. Mine failed the first time with some error about "Antirollback check error". If you get this you have to manually edit the "flash_all.bat" file within the extracted directory and remove the lines that don't start with "fastboot", then save the bat file, and restart the flash. It took MiFlash 604 seconds to complete, and ended with a status of "error: Not catch checkpoint, ..., flash is not done" you can ignore that, or remove that checkpoint in the MiFlash configuration settings. My phone restarted and booted into the stock ROM.

following had the same errors when i mistakenly ignorantly wiped system etc while trying to flash a rom