problem with nfcore_cache.sqlite within /tmp

[lucacozzuto]

Hi all,
I think will be a nice idea to have the nfcore_cache.sqlite within a subfolder in tmp because if two users use the program at the same time the privileges will prevent to use the tool.

For example I cannot even use nf-core --help

Luca

[sven1103]

Thanks @lucacozzuto well spotted!

This is the code line that makes trouble:

tools/nf_core/utils.py

Line 79 in 4ab80b8

cachedir = os.path.join(tempfile.gettempdir(), 'nfcore_cache')

I suggest to setup the cache directory locally in a folder .nfcore_cache in the user's home folder, instead of a system-wide available mount point.

Any objections?

[sven1103]

@ewels I know that you initially wanted to support a multi-tenant system and went for the /tmp dir. However, we don't know the system's file permission policy, and chmod will not always work (as happened here).

[ewels]

Do we have any idea why this isn't working for multiple users at once? If it's world read-write then surely anyone should be able to use it?

I'm mostly just curious 😆

[drpatelh]

@sven1103 Is whispering in my ear at the moment so forgive the typos because he isnt making any sense at all 😕

Apparently, some systems dont allow you to change permissions with chmod so basically the file will only how those permissions at the user-level. The permissions wont be changed if nf-core/tools is creating a cache directory with 777 permissions by someone else. @sven1103 will try to reproduce it.

[ewels]

Don't worry about it @sven1103 - let's just use your homedir solution 👍