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PORemount /system from app
 

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    <p>I am trying to create a small application, that needs read/write access on the /system folder (it is trying to remove a file, and create a new one instead of it). I am able to remount the folder without a problem with adb, and if I do it, certainly my app works fine until the reboot.</p> <p>My device is rooted (sgs3 with stock 4.1.2). I can acquire root access without a problem - i get the pop up message where i can enable it. But after that it does not really respond to commands.</p> <p>I have something like this:</p> <pre><code>//at this point I get the popup to grant root access Runtime.getRuntime().exec("su"); //no error messages - not on console, not in logcat Runtime.getRuntime().exec("mount -w -o remount -t ext4 /dev/block/mmcblk0p9 /system"); //trying to do things in the system folder... FileWriter fw=new FileWriter(file); fw.write("a"); fw.close(); //trying to remount the folder as read only only once everything is done Runtime.getRuntime().exec("mount -r -o remount -t ext4 /dev/block/mmcblk0p9 /system"); </code></pre> <p>If I run the same remounting command from adb shell, everything is perfect. If I don't run it, but try to rely on the app, I get the following error message (IOException thrown) when I try to write/delete from the file system:</p> <pre><code>open failed: EROFS (read-only file system) </code></pre> <p>Some additional info: I am using 2.2 SDK, have WRITE_EXTERNAL_STORAGE permission in my manifest file (although I am not sure if I need it, since I am trying to use the internal storage).</p> <p>All ideas are welcome.</p>
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    1. USskandigraun
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