write access to shared folder

[KrisThielemans]

with current instructions in https://github.com/CCPPETMR/CCPPETMR_VM/blob/master/INSTALL.md on recent VBox, a shared folder doesn't have write permissions.

@DANAJK suggests adding ,dmode=777,fmode=666 to the mount command. umask doesn't help.

[casperdcl]

I'd suggest umask (for forcing permissions), uid and gid (to match host), for example in my fstab for an ntfs drive, where gid=46 is for plugdev:

umask=007,uid=1000,gid=46

Note that for docker, the entrypoint for the container actually creates a new user with uid/gid matching the host if possible and sets file permissions https://github.com/CCPPETMR/SIRF-SuperBuild/blob/master/docker/entrypoint.sh

Not sure how applicable this is to VBox

[KrisThielemans]

@DANAJK do we still have to do anything here? If not, close it.

[DANAJK]

I have a set-up that seems to work and I updated the instructions. Note it required running the id command in the VM and using the user and group id reported by that. This does not seem to be the same as suggested above.