adb permission denied to push files to subdirectry

Question

Why would I get permission denied using adb to copy a directory to a subdirectory on my phone, when I could copy to its parent directory and both have the same permission?



I tried this from my PC to my Nexus 5 running 6.0.1 (Oct 5):



adb push Dir /sdcard/Dir/Subdir


It failed with 



Permission denied


This has worked before, with no changes I'm aware of.



I launched adb shell and ran 



ls -l


to get permissions for /sdcard (storage/emulated/0), /sdcard/Dir and /sdcard/Dir/Subdir:



drwxrwx--x root sdcard_rw


I then:



cd /sdcard/Dir/Subdir

mkdir XYZ


Got 



mdkdir: XYZ: Permission Denied


Tried:



su

mkdir XYZ


Again, permission denied



I then tried another push



adb push XYZ /sdcard/Dir


This worked and copied all of the files.



Why would it work to /sdcard/Dir and not to /sdcard/Dir/Subdir, when both have the same permissions? Why would permission be denied for root?


— foosion | Sources

Answer

As it appears in this comment, the file permissions and access control to SubDir differs from what ideally should be.



The problem:



# ls -l on /data/media/0/Dir

dwrxrwxr-x root root


The user group should have been media_rw instead of root.



The solution is to change to appropriate group or make the directory writable by others.





chmod 777 /data/media/0/Dir/SubDir

 # making SubDir writable by others

chgrp media_rw /data/media/0/Dir/SubDir  # Alternatively, changing group from root to media_rw


Note: you may need to install Busybox or Toybox to have and use chmod and/or chgrp.


— Firelord | Sources

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