[Q] Problem with remounting /system - Android Q&A, Help & Troubleshooting

Hi all.
I apologize ahead of time that this thread is so long, but I have quite a problem. I am in the process of rooting my unlocked Galaxy S4 running Android 5.0.1 lolipop, but I cannot add the su and busybox to my /system/bin folder because /system is a read-only filesystem. I have done just about everything I can think of to mount and remount, like typing adb remount and mount -o remount,rw /system, but they just give me the same answer saying permission is denied. I tried doing adb root to get the permission I needed, but I got an error message saying that adbd cannot run as root in production builds. After doing some research, I found out that the /default.prop has debuggable=0 and that may be what is not allowing me to restart adb as root. So I opened the shell and typed cat to see and sure enough it was set to 0. So I did echo and set the variable to 1. However, whenever I hit enter, I got another error telling me the same thing, that /default.prop is a read-only file. I am at a loss of what to do now. How I can mount and unmount the /system if I can't get any permission to do so? Any help would be greatly appreciated. I do ask though, please don't recommend ready made apps that can insta-root your phone like a supah-hackah because I want to do this the hard way for gratification's sake. I am just stuck and need some help to get the /system to allow writing as opposed to read-only. Thanks in advance.

Related

[Q] /system folder read/write via adb remount

Hi,
I recently pushed some fixes to my Hero's system folder and mounted it with read/write access via the adb remount command. All this is as expected so no problems. I was wondering however if I could remount it with read only access again, just for security until I need to gain access again.
Any help or tips with this would be appreciated!
Update:
OK guys sorry but I have answered my own question here. Digifail had the info!
"adb remount
This command remounts /system to be read/write, rather than the default read-only. Useful when modifying system applications or other root-only operations. It is advised to reboot after using this option so that the system will mount /system read-only again (for whatever reason, running "adb remount" a second time does not return /system to read-only status). "
Guess a reboot will sort this.

[Q] How to ADB push?

I'm trying to push files to /system via ADB. However I'm having problems (getting permission errors). I am running Eclipse 2.0.2, so yes, my phone is rooted, I have su and busybox.
Phone is connected to PC and is set as "USB Mass Storage".
USB Debugging is ON
Here is my CMD log:
Code:
C:\android-sdk\tools>adb remount
remount failed: Operation not permitted
I tried to remount and it failed
Code:
C:\android-sdk\tools>adb push C:\myfile.apk /system
failed to copy 'C:\myfile.apk' to
'/system/myfile.apk': Read-only file system
I tried to push, and got a READ-ONLY FILE SYSTEM error (keep this in mind)
Code:
C:\android-sdk\tools>adb shell
$ adb push C:\myfile.apk /system
adb push C:\myfile.apk /system
adb: permission denied
I try to push inside of ADB shell. Nothing again...
Code:
$ su
su
# mount -o remount,rw /dev/block/mtdblock4 /system
mount -o remount,rw /dev/block/mtdblock4 /system
# exit
exit
I go into SU and attempt to remount the /system
Code:
$ adb push C:\myfile.apk /system
adb push C:\myfile.apk /system
adb: permission denied
$ exit
exit
I go back up to ADB shell and try to push again... same error as before
Code:
C:\android-sdk\tools>adb push C:\myfile.apk /system
failed to copy 'C:\myfile.apk' to '/system/myfile.apk': Permission denied
I go back to the main command line and try to push again. This time I get PERMISSION DENIED. This error is different than before.
Any help on the matter?
I've read about ro.secure needing to be set to 1, but I need to edit the boot.img in order to do this, correct? Does that require an unlocked bootloader? Is root ADB even possible on the DX2.
Thanks!
I am no expert (don't even know if i know enough to b called a newb) but maybe try a root explorer. I use es file explorer because it's free. In settings check root explorer and mount file system. I received similar errors and this solved my problem.
Sent from my DROID X2 using XDA App
I'm familiar with root explorer, it's easy. I'm wanting to be able to use ADB though. Your post made me try something new though. I plugged my phone into my PC, then went into root explorer and mounted everything as RW. But, still was unable to push via ADB. Thanks for the reply though
So, how can I get ADB working?
wesf90 said:
I'm familiar with root explorer, it's easy. I'm wanting to be able to use ADB though. Your post made me try something new though. I plugged my phone into my PC, then went into root explorer and mounted everything as RW. But, still was unable to push via ADB. Thanks for the reply though
So, how can I get ADB working?
Click to expand...
Click to collapse
I was using adb also and had similar problems. After i changed those settings i was able to push a file. I had to have system mounted.
Sent from my DROID X2 using XDA App
No luck on my end :/
Sorry i couldn't be more help. I am new to adb and may have done more to get it working. I'm sure there's someone else around here that can help u out.
Sent from my DROID X2 using XDA App
Make sure there are no spaces in the file path to your android-sdk folder. Can't say if this is your issue but its worth a shot as it has always caused weird problems with android development since day one.
Sent from my DROID X2 using Tapatalk
Ro.secure is in your local.prop on the root of your phone. As far as your issue you have to reset permissions in order to push to /system. I saw that you were trying to do that but with no success. I believe I know what will help but I will have to find it and repost.
http://forum.xda-developers.com/showthread.php?t=1133528
Ok look at the command lines at the bottom of the op. You are going to use adb shell. Follow that almost exactly but adjust according to your directories. Should go into adb shell, gain su permissions, mount /system rw, push your apk, then don't worry about remounting as ro, just reboot. Pay close attention to spaces.
Sent from my DROID X2 using xda premium
CadenH said:
Ro.secure is in your local.prop on the root of your phone. As far as your issue you have to reset permissions in order to push to /system. I saw that you were trying to do that but with no success. I believe I know what will help but I will have to find it and repost.
http://forum.xda-developers.com/showthread.php?t=1133528
Ok look at the command lines at the bottom of the op. You are going to use adb shell. Follow that almost exactly but adjust according to your directories. Should go into adb shell, gain su permissions, mount /system rw, push your apk, then don't worry about remounting as ro, just reboot. Pay close attention to spaces.
Sent from my DROID X2 using xda premium
Click to expand...
Click to collapse
Took me a few days to be able to getting around to trying this, but it didn't work :/ I'm still getting all of the same errors. The /system just doesn't seem to want to mount as RW (even though it is possible when using root explorer).
As for ro.secure in my local.prop, I'm able to edit this but it resets on reboot because (from what I've read) this is a file generated by the kernel
Anyone else have ideas?
Wes
wesf90 said:
Took me a few days to be able to getting around to trying this, but it didn't work :/ I'm still getting all of the same errors. The /system just doesn't seem to want to mount as RW (even though it is possible when using root explorer).
As for ro.secure in my local.prop, I'm able to edit this but it resets on reboot because (from what I've read) this is a file generated by the kernel
Anyone else have ideas?
Wes
Click to expand...
Click to collapse
Moon shadow has a post in development to mount system rw
It's some type of script u run before adb or something
I don't know anything bout adb
But I do know he created it for this reason
Check it out
It's prolly got the info you need
ashclepdia said:
Moon shadow has a post in development to mount system rw
It's some type of script u run before adb or something
I don't know anything bout adb
But I do know he created it for this reason
Check it out
It's prolly got the info you need
Click to expand...
Click to collapse
Thanks for that! It's not quite what I'm aiming to eventually do, but did give me more insight on how the whole adb/shell/su systems work. From inside of su, I was able to mount the /system as RW, however I'm only able to do this from inside of SU. I want to be able to do this from the initial CMD so that I can ADB PUSH from my computer to the phone.
Here's my latest log:
Code:
C:\android-sdk>adb shell
[[TRYING TO MOUNT FROM ADB SHELL]]
$ mount -o rw,remount -t ext3 /dev/block/mmcblk1p21 /system
mount -o rw,remount -t ext3 /dev/block/mmcblk1p21 /system
mount: Operation not permitted
[[TRYING TO MOUNT FROM ADB SHELL USING BUSYBOX]]
$ busybox mount -o rw,remount -t ext3 /dev/block/mmcblk1p21 /system
busybox mount -o rw,remount -t ext3 /dev/block/mmcblk1p21 /system
mount: permission denied (are you root?)
[[GO TO SU]]
$ su
su
[[MOUNTING AS RW SUCCESSFUL]]
# mount -o rw,remount -t ext3 /dev/block/mmcblk1p21 /system
mount -o rw,remount -t ext3 /dev/block/mmcblk1p21 /system
[[COPYING A FILE INSIDE /SYSTEM SUCCESSFUL]]
# cp framework/framework-res.apk framework/framework-res-test.apk
cp framework/framework-res.apk framework/framework-res-test.apk
[[REMOUNTING /SYSTEM AS RO]]
# mount -o ro,remount -t ext3 /dev/block/mmcblk1p21 /system
mount -o ro,remount -t ext3 /dev/block/mmcblk1p21 /system
[[ATTEMPTING TO COPY AGAIN, FAILED]]
# cp framework/framework-res.apk framework/framework-res-test2.apk
cp framework/framework-res.apk framework/framework-res-test2.apk
cp: can't create 'framework/framework-res-test2.apk': Read-only file system
#
So now the question is, how do I mount as R/W so I can use ADB push?
Wes
Maybe its because im tired but im confused as to why it wont let you push your files if you have remounted as rw. At that point it should be cake. You gained access to system by remounting it as rw successfully already.
Sent from my DROID X2 using xda premium
wesf90 said:
So now the question is, how do I mount as R/W so I can use ADB push?
Wes
Click to expand...
Click to collapse
Try:
Code:
adb devices
adb remount
adb push [filename] [destination]
adb reboot
the "adb remount" remounts the fs RW instead of the default RO.
I'm no expert in ADB, but I had run into the same issue as you and for me the fix was to go into ADB SHELL , then type SU to get SU access, then type exit twice to get out of shell completely. Then I tried pushing the APK and it worked fine with no read only errors.
This worked for me on my SGS2, could work for you ! Goodluck !
Come to IRC and I can help you with this. http://webchat.freenode.net Come to the #cm7dx2 channel. I'm usually there... Look for the nick(s) Moon|Work|(something), Moon|Home|(something), or MoonShadow-NM. If the (something) says Busy, I might not answer right away. If it says Away, I'm away from the keyboard and you won't receive a response until I return.
Ciao!
Any update
did you ever get this figured out? I'm having the same frustrations on mine. Mine won't install the 2.3.5 update due to it not recognizing the Quickoffice.apk and I'm trying to push the files manually, but I'm having no luck getting past the same you've posted here.
hellhunter said:
did you ever get this figured out? I'm having the same frustrations on mine. Mine won't install the 2.3.5 update due to it not recognizing the Quickoffice.apk and I'm trying to push the files manually, but I'm having no luck getting past the same you've posted here.
Click to expand...
Click to collapse
I've got a better idea to fix your issue brotha!
From my nexus tappin the talk
<edit post successful>
hellhunter said:
did you ever get this figured out? I'm having the same frustrations on mine. Mine won't install the 2.3.5 update due to it not recognizing the Quickoffice.apk and I'm trying to push the files manually, but I'm having no luck getting past the same you've posted here.
Click to expand...
Click to collapse
Do this
Sbf to 2.3.4
(or 2.3.3& take one ota To get to 2.3.4...however you want to do it..just be bone stock 2.3.4 )
Root your device.
BUT DO NOT USE ZERGRUSH TO ROOT
Use petes Motorola one click root method.
Then continue the process as normal from there on out.
Trust me in this. Zergrush root method is not playing nice with your /system partition, (if you notice during the root process it might say something like "making room in system,"= or "moving/deleting app to make room" something similar)
And when it does that, it's messing up how the update checks for untouched stock apps.
Let me know how it goes.
This solution has worked for COUNTLESS others so far, zergrush has always been the culprit when it comes to failing to find certain apk or system file that needs to be there for the update to install.
From my nexus tappin the talk
<edit post successful>
jamesh0317 said:
Try:
Code:
adb devices
adb remount
adb push [filename] [destination]
adb reboot
the "adb remount" remounts the fs RW instead of the default RO.
Click to expand...
Click to collapse
This won't work with Eclipse since it's not using 2nd init. I asked this question in the Eclipse forums and Nitro responded with the following:
Not without using 2nd init. All of that works due to being able to load its own init.rc which starts services and passes parameters, etc.. during boot time. It is possible to make a stock rom use 2nd init. CM9 will not even have root enabled by default. The only other way to push stuff is to enable root shell prior to pushing.
Click to expand...
Click to collapse
I know that CM7 allows using the adb remount, but that's because it's using 2nd init. I had also asked the question about why CM7 defaults to root shell when you adb shell into it and that's why he mentions how CM9 won't have root enabled by default.
The way I push to Eclipse is to run root explorer on my phone and mount the directory r/w. Then, I can use "adb push" to the phone.
ashclepdia said:
Do this
Sbf to 2.3.4
(or 2.3.3& take one ota To get to 2.3.4...however you want to do it..just be bone stock 2.3.4 )
Root your device.
BUT DO NOT USE ZERGRUSH TO ROOT
Use petes Motorola one click root method.
Then continue the process as normal from there on out.
Trust me in this. Zergrush root method is not playing nice with your /system partition, (if you notice during the root process it might say something like "making room in system,"= or "moving/deleting app to make room" something similar)
And when it does that, it's messing up how the update checks for untouched stock apps.
Let me know how it goes.
This solution has worked for COUNTLESS others so far, zergrush has always been the culprit when it comes to failing to find certain apk or system file that needs to be there for the update to install.
Click to expand...
Click to collapse
I think I may have tried that in one of my iterations. Originally I had it rooted with One-Click and then I was having issues with the 2.3.5 OTA update (quickoffice.apk) and at this point I've SBF'ed and rooted it probably 5 times this week so far. Rooted with both One-click and zergRush at various times. Actually I think every time except this last time has been with one-click. So I don't think that has seemed to make a difference for me so far. I can try it again, but if there's any other advice to throw out in the mean time, I'll take it.
Alternatively, I may take the new phone (the first replacement they sent had 2.3.5 on it, but a bad menu key causing the phone to flip out), load Titanium Backup on it, backup all the system apps and restore them to my original phone. Worst case is I have to SBF it again. But that seems like a logical process since I will have two phones available.

[Q] 4.0.3 HTC Temp Root Question

Hello everybody,
i have gained root access to my phone via backup/restore method through adb where local.prop is stored in /data/. So when i log onto my phone with adb i have root access. I copied busybox, su and the superuser.apk to the right place and removed the local.prop file again. After a reboot I was hoping to remove some crapware off my phone but to my surprise the binaries i copied vanished from the filesystem. So the phone reverted the changes by itself. I did this process several times copying busybox and su to various places referred to by $PATH, but it´s everytime the same after i reboot. The files are gone.
After the first attempts failed i tried to make changes to my phone while logged in as root. I wanted to uninstall unnecessary packages with "pm uninstall" but that failed also. The command just responds "failed". Even when /system is mounted rw (it remounts itself to ro after a while though). I´ve also made changes to /init.rc but they are also gone after a reboot as other changes i´ve made. Basically i wasn´t able to accomplish anything with root access no matter what i did.
So what i want to know is how this black magic works andy why i cant do anything with root. I know how to achieve real root through htc dev and various other methods.
Thanks for reading!
nasenstueber said:
Hello everybody,
i have gained root access to my phone via backup/restore method through adb where local.prop is stored in /data/. So when i log onto my phone with adb i have root access. I copied busybox, su and the superuser.apk to the right place and removed the local.prop file again. After a reboot I was hoping to remove some crapware off my phone but to my surprise the binaries i copied vanished from the filesystem. So the phone reverted the changes by itself. I did this process several times copying busybox and su to various places referred to by $PATH, but it´s everytime the same after i reboot. The files are gone.
After the first attempts failed i tried to make changes to my phone while logged in as root. I wanted to uninstall unnecessary packages with "pm uninstall" but that failed also. The command just responds "failed". Even when /system is mounted rw (it remounts itself to ro after a while though). I´ve also made changes to /init.rc but they are also gone after a reboot as other changes i´ve made. Basically i wasn´t able to accomplish anything with root access no matter what i did.
So what i want to know is how this black magic works andy why i cant do anything with root. I know how to achieve real root through htc dev and various other methods.
Thanks for reading!
Click to expand...
Click to collapse
is your RECOVERY.img
and beside i dont really think your /system is fully mounted rw
mauricio.valladolid said:
is your RECOVERY.img
and beside i dont really think your /system is fully mounted rw
Click to expand...
Click to collapse
Thanks for the reply. i use mount -o remount,rw /system as mount command to get read/write permission on /system. If there is something more to do please let me know. And if the behavior i ve seen is caused by the recovery.img is there something i can do about it?
nasenstueber said:
Thanks for the reply. i use mount -o remount,rw /system as mount command to get read/write permission on /system. If there is something more to do please let me know. And if the behavior i ve seen is caused by the recovery.img is there something i can do about it?
Click to expand...
Click to collapse
why dont you just install ext4 recovery and flash supersu.zip?
I really dont get it why are you trying to do it the hard way

[Q] [help]how to get system folder permission for hdx7

I just play andorid device a few days, but My hdx7 is a little bricked because i deleted some system app. Now I can log in fire os, have adb, usb connected and internal storge, even i can operate device setting app, but i can't open the other app because i don't have a desktop.
I compare system/app folder with the same folder in the amazon bin, found that the folder lack of scores of app, but the other system folder is the same. So I hope can adb push app folder to the system folder, but the pemission denied. I try to remount or mount, it can't work.
if adb root, then "adbd cannot run as root in production builds.
if adb push apk to the app folder, then “permission denied".
if adb remount, then ”remount failed: Operation not permitted".
and I have try adb shell like that:
# su
# mount -o rw,remount -t yaffs2 /dev/block/mtdblock3 /system
# chmod 777 /system
# exit
it didn't work.
my hdx7 have rooted.
My Questions are:
1. If I could push the app folder to the system folder and reset to factory, is my hdx saved?
2. How to get the system folder rw in the situation?
thx for any prompt, although i am a rookie but i will try my best, i wish the adept can help me and will be enormously grateful. Sorry for my poor english.
It sounds to me that you had lost root.
kschang said:
It sounds to me that you had lost root.
Click to expand...
Click to collapse
So i have tried root again like "http://forum.xda-developers.com/showthread.php?t=2544965" said
But it didn't work, please see the attach, But I don't know why.
Sorry for that i'm rookie to andorid and ask so many questions.
randolphling said:
So i have tried root again like "http://forum.xda-developers.com/showthread.php?t=2544965" said
But it didn't work, please see the attach, But I don't know why.
Sorry for that i'm rookie to andorid and ask so many questions.
Click to expand...
Click to collapse
Hmmm... It says you still have root (the prompt changed after "su")
I personally don't use ADB much. I have Root Explorer (grabbed it legally for free from Amazon ages ago) and Wifi Explorer Pro (same method) so I basically WiFi myself the files I need sideloaded then move them around on the device itself. But if you've lost launcher, you have deeper issues.
Have you tried ADB push any launcher? Or even a download store like 1Mobile or Aptoide?
ADB is basically a Linux shell debug into Android, so you need to learn some Unix shell commands. I'm sure you can find ADB guides with the basic commands, like "ls", "cp", and so on.
You need to check the directory and see if the system/app and other system directories are still there. This is one reason I only play with the copy of ROM I have (see Safestrap Recovery).

How to push build.prop whilst phone is in recovery mode

Hi guys
I need some serious help with my phone... i accidently edited build.prop and now my phone doesn't boot anymore.
I need to push a new build.prop file to my phone.. I can get into recovery mode on the phone and I've managed to pull build.prop from the phone but I cannot push it back due to "Permission Denied"
Does anyone know a adb command or application or something that can help me sort this out?
My phone is the Huawei Ascend P2
Thanks guys.
jdcrispe95 said:
Hi guys
I need some serious help with my phone... i accidently edited build.prop and now my phone doesn't boot anymore.
I need to push a new build.prop file to my phone.. I can get into recovery mode on the phone and I've managed to pull build.prop from the phone but I cannot push it back due to "Permission Denied"
Does anyone know a adb command or application or something that can help me sort this out?
My phone is the Huawei Ascend P2
Thanks guys.
Click to expand...
Click to collapse
If you try and mount the USB Storage ?
UltraWelfare said:
If you try and mount the USB Storage ?
Click to expand...
Click to collapse
How do I do that?
adb mount /sdcard?
jdcrispe95 said:
How do I do that?
adb mount /sdcard?
Click to expand...
Click to collapse
No from recovery
UltraWelfare said:
No from recovery
Click to expand...
Click to collapse
oh, the phone doesn't have CWM recovery.. I wish it did though
http://www.techpository.com/?page_id=224
Android: ADB – Mount a filesystem read-write
Mount a filesystem read-write
Very often when you want to write files to a particular partition on ADP1, you will get a “Permission Denied” if the partition is mounted read-only.
To get around this, you need to mount the partition read-write. Typically this is done with /system partition
$adb shell
$ su
$mount -o rw,remount -t yaffs2 /dev/block /mtdblock3 /system
(Replace /dev/block/mtdblock3 & /system with appropriate device path and mount point, as obtained from cat /proc/mounts)
This was the first result on Bing with the search terms "adb mount read write"
Sent from my Nexus 4 using XDA Premium 4 mobile app
HI Dragon
Thanks for your post
I am getting the error "sh: -o: not found" with the last command
I'm not entirely sure on how to use the remount command.. I'm trying to mount the system partition i guess?
could you please provide some noobish info on how to get this done?
I don't know what "/dev/block" means, nor "mtdblock3" .. I know /system is the part with build.prop in though
Edit: device not found
adb devices
You see yours? Good
adb shell
mount
This may tell you or try
adb shell
cat /proc/partitions
Or maybe
ls -l -a /dev/block/platform
Then from here find chip and search this and so on and so and if you find a by-name directory your good
Sent from my Nexus 4 using XDA Premium 4 mobile app
I was trying to copy a update file to the sdcard, but I kept getting permission denied, so I went into adb shell and tried remounting the phone with rw permissions and it kept saying "Device not found" ..
I think im just gonna have to take it back to 3 and wait 50 weeks to get it back

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