Access denied when writing to file in RStudio Server

Question

In RStudio Server I want to write to the directory /var/www/r_diagnostics:

f <- "/var/www/r_diagnostics/test.txt"
writeLines("test", con = f)

The name of my user is randomuser.

> system("whoami")
randomuser

The directory permissions for r_diagnostics are set as:

drwxrwxrwx  2 randomuser randomuser   4096  6. Jan 18:15 r_diagnostics

What can I do about it?

Do you have execute permission for each directory in the path? — Matthew Lundberg, Jan 06 '17 at 17:35
If you have access to the folder with winscp, then you can change its permissions by right clicking on the folder — akrun, Jan 06 '17 at 17:36
@MatthewLundberg No, I do not. Is that absolutely necessary? — Mark Heckmann, Jan 06 '17 at 17:44

score 2 · Accepted Answer · answered Jan 06 '17 at 21:55

To write a file, you have to find the directory. This requires execute permission for each element in the path. Execute permission allows you to find a directory's contents.

Plus, you also need write permission to the final leaf directory in order to modify a file (you had that already).

Access denied when writing to file in RStudio Server

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