Running Ubuntu 14.04 (Trusty), I have mounted an exFAT formatted USB drive. While attempting to git clone a repo onto it, I've run into the following error:

Cloning into 'rschedule'...
error: chmod on /media/john/John/apps/rschedule/.git/config.lock 
failed: Function not implemented
fatal: could not set 'core.filemode' to 'false'

Cloning the repo onto my computer's local file system works normally. I can also otherwise access the USB drive normally (i.e. read / create files).

Any ideas as to what may be going wrong?

Additional information which is hopefully irrelevant: Ubuntu is running on a Chromebook using crouton.


A possibly related question: How do I use 'chmod' on an NTFS (or FAT32) partition?. Unfortunately, assuming it is related, I haven't been able to figure out how to translate that question / answers to my problem.

  • Please run sudo chmod a+rwx /path/to/fvat/usb and try again! Dec 12, 2018 at 14:34
  • @GeorgeUdosen Thanks! Unfortunately, that command results in the following error: chmod: changing permissions of '/media/john/John': Function not implemented
    – John
    Dec 12, 2018 at 14:40
  • ok have a look at these: stackoverflow.com/questions/1580596/… use the git config core.fileMode false version so it's not globally set Dec 12, 2018 at 14:42
  • @GeorgeUdosen the git directory is currently remotely hosted on gitlab. Attempting to run git config outside of a git repository is giving me a fatal: not in a git repository error
    – John
    Dec 12, 2018 at 14:49
  • 1
    @GeorgeUdosen I think I'm able to get the proper permissions when mounting using sudo mount -t exfat -o rw,auto,user,fmask=0022,dmask=0000,uid=1000,gid=1000 /dev/sda2 /media/john (where 1000 is the user id and group id). Unfortunately, this still doesn't fix the git clone problem (I also tried adding umask=000, no luck). It looks like I was wrong and the How do I use 'chmod' on an NTFS (or FAT32) partition? question is unrelated to this one. Thanks for all your help.
    – John
    Dec 12, 2018 at 16:01

1 Answer 1


Assembling from the comments above:

Mounting with

sudo mount -t exfat -o rw,auto,user,fmask=0022,dmask=0000,uid=1000,gid=1000 /dev/sda1 mnt

where mnt is in my home directory thus owned by me and then doing

git -c core.fileMode=false clone ../whatever-bare-repo.git/

seems to work correctly

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