A terminal command for a rooted Android to remount System as read write

Question

I m writing an android app that needs to copy a file to the   system  partition at runtime  I ve got the commands to run  su  and can successfully request SuperUser permissions and run commands as root  But I don t know how to make this app universal across multiple devices  because the mount command can differ depending on where the  system is actually mounted  Here s the command that s used most offen   mount -o remount rw -t yaffs2  dev block mtdblock3  system   But I know that mtdblock3 could be different on some devices  and for that matter  i guess so could yaffs2   So  my question is  Is there a universal command that will work on all phones  Or is there a way to find out at runtime what the correct parameters are

User · Answer

This is what works on my first generation Droid X with Android version 2.3.4. I suspect that this will be universal. Steps:

root system and install su.
Install busybox
Install a terminal program.
to mount system rw first su then
```
busybox mount -o rw,remount system
```
To remount ro
```
busybox mount -o ro,remount system
```

Note that there are no slashes on "system".

User · Answer

Try     mount -o remount rw  system   If no error message is printed  it works   Or  you should do the following   First  make sure the fs type      mount   Issue this command to find it out   Then     mount -o rw remount -t yaffs2  dev block mtdblock3  system   Note that the fs yaffs2  and device  dev block mtdblock3  are depend on your system

User · Answer

I had the same problem   So here is the real answer  Mount the system under  proc  Here is my command    mount -o rw remount  proc  system    It works  and in fact is the only way I can overcome the Read-only System problem

User · Answer

You can run the mount command without parameter in order to get partition information before constructing your mount command  Here is an example of the mount command without parameter outputed from my HTC Hero     mount mount rootfs   rootfs ro 0 0 tmpfs  dev tmpfs rw mode 755 0 0 devpts  dev pts devpts rw mode 600 0 0 proc  proc proc rw 0 0 sysfs  sys sysfs rw 0 0 tmpfs  sqlite stmt journals tmpfs rw size 4096k 0 0 none  dev cpuctl cgroup rw cpu 0 0  dev block mtdblock3  system yaffs2 rw 0 0  dev block mtdblock5  data yaffs2 rw nosuid nodev 0 0  dev block mtdblock4  cache yaffs2 rw nosuid nodev 0 0  dev block  vold 179 1  sdcard vfat rw dirsync nosuid nodev noexec uid 1000 gid  1015 fmask 0702 dmask 0702 allow utime 0020 codepage cp437 iocharset iso8859-1 s hortname mixed utf8 errors remount-ro 0 0

User · Answer

You can try adb remount command also to remount  system as read write   adb remount

User · Answer

I use this command   mount -o rw remount  system

User · Answer

If you have rooted your phone  but so not have busybox  only stock toybox  here a one-liner to run as root    mount -o rw remount    mount   sed     system   d    cut -d     -f 1    system  toybox do not support the  -o remount rw  option  if you have busybox  you can use it    busybox mount -o remount rw  system

User · Answer

You don t need to pass both arguments when performing a remount  You can simply pass the mount point  here  system   And  system is universal amongst Android devices

User · Answer

Instead of     mount -o rw remount  system    use     mount -o rw remount  system   mind the     at the end of the command  you ask why this matters   system  is the directory under  system while  system is the volume name

[android] A terminal command for a rooted Android to remount /System as read/write

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