All reading and writing to the file system is done in the *parent* process.
Using device storage is the main way of getting access to the file system.
Ray You wrote:
Hi Doug Turner,
I am developing an API that operates files and directories on SD card
using nsIFile. All the reading features work fine. When I try to write
to SD Card like renaming or copying a file, I got a
NS_ERROR_FILE_ACCESS_DENIED error from nsIFile.
1.
I find out that permission of /sdcard is "---rwxr-x system sdcard_rw",
which indicates that users who are not in sdcard_rw group don't have
permisson to write. I also notice that the owner of each app process
is app_<pid>.
Q: Is there some way to add the owner of an app process to sdcard_rw
group?
2.
I tried to add device-storage:sdcard permisson in the manifest.webapp
of my test app. It doesn't work.
Q: Is device-storage:sdcard only for Device Storage API?
3.
I see DeviceStorage API uses IPC and perform file operations in the
parent process.
Q: Is this the supposed / standard way for an API to gain write
permission of SD card? If not, then what is?
Thank you!
--
Best regards,
尤睿（Ray You）
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