Read only file system on Android

Question

I recently rooted my Droid X and everything seems to be working perfectly  I made some changes to build prop and when I do adb push build prop  system  I get the following error  failed to copy  c  build prop  to   system  build prop   Read-only file system   How can I fix this

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Try this in a Terminal Emulator as root   restorecon -v -R  data media

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I just only needed this  su -c  quot mount -o rw remount  system quot

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Thanks  S  rgio  for  mount  command without parameters idea  I d need to made adb push into  data data com my app lib for some test issue  and get  Read-only filesystem  message   ls command shows me   root android     ls -l  data data com my app  drwxrwx--x u0 a98   u0 a98            2016-05-06 09 16 cache drwxrwx--x u0 a98   u0 a98            2016-05-06 09 04 files lrwxrwxrwx system   system            2016-05-06 11 43 lib - gt   mnt asec com my app-1 lib  So  it s understood  that  lib  directory is separated from other application directories   Command mount -o rw remount  mnt asec didn t resolve  r o fs  issue  it wants device parameter before directory parameter    df  command didn t help also  but shows that my  mnt asec com my app-1 directory is at the separate mount point   Then I looks by mount and voila   root android     mount            dev block dm-4  mnt asec com my app-1 ext4 ro dirsync relatime 0 0  Next steps are already described upwards  remount to RW  push and remount back to RO

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mount -o rw remount  dev stl12  system   works for me

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Here is what worked for me  I was running an emulated Android 7 1 1  Nougat  device   On a terminal  I hit the following command  One thing to be noticed is the -writable-system flag    emulator -writable-system -avd Nexus 6 API 25  -partition-size 280   On another tab    adb shell su mount -o rw remount -t ext4  dev block vda  system   All the changes that you do on the  system contents will survive a restart

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I checked with emulator and following worked    adb reboot adb root  amp  amp  adb remount  amp  amp  adb push   Desktop hosts  system etc hosts   As mentioned above as well  execute second step in single shot

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Copy files to the SD-card   Well  I assume you like to copy data to the Sd-card from the developers computer  You might have rooted the devise and made the area you address available   I had about the same problem to upload data files for my application Android Studio 1 3 2 in Win7   but    First the adb command-shell has to be found in th path   PATH  PATH  C  Users XXXXX AppData Local Android sdk platform-tools  the folder AppData is hidden  so you have to set the folder setup not hiding concealed files and folder to find it  Path works regardless  You have to spell the folder path right or you get a read-only error message  most likely it must start with  sdcard or it is read only area  As soon as I did no problem pushing the file to the emulator    So for instance the the adb command can look like this    adb push C  testdata t txt  sdcard download t txt

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If there s a failure in copying the read-only file you can try locating the original file in the root directory and modify it with a root text editor  preferably  RB text editor  it comes with ROM Toolbox app

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Sometimes you get the error because the destination location in phone are not exist  For example  some android phone external storage location is  storage emulated legacy instead of  storage emulated 0

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Adding a little bit more to Jan Bergstr  m s answer  Because Android is a Linux based system  and the path in Linux contains forward slashes       while using push command  use     to define destination path in the Android device   For Example  the command goes  adb push C  Users admin Desktop 1 JPG sdcard pictures   Notice that here  back slashes are used to define source path of the file to be pushed from windows PC and forward slashes are used to define destination path because Android is a Linux based system  You don t have to act as a root to use this command and also  it works perfectly fine on production devices

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I think the safest way is remounting the  system as read-write  using   mount -o remount rw  system   and when done  remount it as read-only   mount -o remount ro  system

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I found this article from google  and thought I d add the steps necessary on a Sony Xperia Z  4 2 2    The Sony has a watchdog process which detects when you ve changed ro to rw on   and  system  these are the only ones I was trying to modify  and possibly others   The following was what I ran to perform the changes I was trying to achieve   I pasted these into a window  because removing the execute bit from  sbin ric needs to be done quickly in order to stop it restarting itself    I tried stop ric  this doesn t work - although it worked on a previous version of android on the phone    pkill -9 ric  mount -o rw remount -t rootfs   chmod 640  sbin ric mount -o rw remount  system   I modified the hosts file here  so this is the place you make the changes you need to the filesystem   To leave things the way we found them  do this   mount -o ro remount  system chmod 750  sbin ric mount -o ro remount -t rootfs     At which point ric should automatically restart    It restarted for me automatically

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In my case I was using the command adb push   Desktop file txt   sdcard   I changed it to   Desktop file txt  sdcard  and then it worked   Make sure to disconnect and reconnect the phone

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As chen-xing mentioned the simplest way is   adb reboot   But for me I had to change my settings first   Settings   Developer options   Root access  Make sure ADB has Root access

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Got this off an Android forum where I asked the same question  Hope this helps somebody else   On a terminal emulator on the phone   mount -o rw remount -t yaffs2  dev block mtdblock3  system   Then on the cmd prompt  do the adb push

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This worked for me   Mount as ReadOnly  su -c  mount -o rw remount  system    Change Permission for file su -c  chmod 777  system build prop    Edit the file to add the property su -c  busybox vi  system build prop    Add now service adb tcp port 5678    Reset old permissions su -c  chmod 644  system build prop     Mount as readonly again once done su -c  mount -o ro remount  system

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Try the following on the command prompt    gt adb remount  gt adb push framework-res old apk  system framework-res apk

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Open terminal emulator on the phone  then  adb shell   after that daemon is started  su mount -o rw remount  mnt sdcard   then the read only is converted into the read-Write

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On my Samsung galaxy mini S5570  after got root on cellphone    Fist  as root  I ran   systemctl start adb   as a normal user    adb shell  su    Grant root permissions on touch screen  mount    list all mount points that we have and we can see  in my case  that  dev stl12 was mounted on  system as ro  ready only   so we just need do    mount -o rw remount  dev stl12  system

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it sames that must extract and repack initrc img and edit init file with the code of mount  system

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adb remount   works for me and seems to be the simplest solution

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adb disable-verity adb reboot adb root adb remount   This works for me  and is the simplest solution

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While I know the question is about the real device  in case someone got here with a similar issue in the emulator  with whatever tools are the latest as of Feb  2017  the emulator needs to be launched from the command line with   -writable-system   For anything to be writable to the  system  Without this flag no combination of remount or mount will allow one to write to  system   After the emulator is launched with that flag  a single adb remount after adb root is sufficient to get permissions to push to  system   Here s an example of the command line I use to run my emulator     emulator -writable-system -avd Nexus 5 API 25 -no-snapshot-load -qemu   The value for the -avd flags comes from     emulator -list-avds

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Not all phones and versions of android have things mounted the same  Limiting options when remounting would be best   Simply remount as rw  Read Write      mount -o rw remount  system   Once you are done making changes  remount to ro  read-only      mount -o ro remount  system

[android] Read only file system on Android

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