"Read only file system" when uploading

sney commented

2024-07-08 22:47:03 +02:00

Hi,

This is probably a support question rather than a bug. I have been attempting to host 0x0 on a vps. I am pretty familiar with linux administration but I've never used flask or uwsgi before.

I followed the instructions at https://uwsgi-docs.readthedocs.io/en/latest/WSGIquickstart.html and https://uwsgi-docs.readthedocs.io/en/latest/Nginx.html. uwsgi and 0x0 are running and I can browse to the homepage: https://file.sney.ca/. However, when I try to upload a file, this happens:

jesse@bivouac:~/Pictures$ curl -F'file=@doFAZ.png' -Fexpires=24 https://file.sney.ca
<!doctype html>
<html lang=en>
<title>500 Internal Server Error</title>
<h1>Internal Server Error</h1>
<p>The server encountered an internal error and was unable to complete your request. Either the server is overloaded or there is an error in the application.</p>

And the following is logged on the server:

Jul 08 16:37:58 vps262219 uwsgi[30246]: [2024-07-08 16:37:58,190] ERROR in app: Exception on / [POST]
Jul 08 16:37:58 vps262219 uwsgi[30246]: Traceback (most recent call last):
Jul 08 16:37:58 vps262219 uwsgi[30246]: File "/usr/lib/python3/dist-packages/flask/app.py", line 2525, in wsgi_app
Jul 08 16:37:58 vps262219 uwsgi[30246]: response = self.full_dispatch_request()
Jul 08 16:37:58 vps262219 uwsgi[30246]: ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Jul 08 16:37:58 vps262219 uwsgi[30246]: File "/usr/lib/python3/dist-packages/flask/app.py", line 1822, in full_dispatch_request
Jul 08 16:37:58 vps262219 uwsgi[30246]: rv = self.handle_user_exception(e)
Jul 08 16:37:58 vps262219 uwsgi[30246]: ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Jul 08 16:37:58 vps262219 uwsgi[30246]: File "/usr/lib/python3/dist-packages/flask/app.py", line 1820, in full_dispatch_request
Jul 08 16:37:58 vps262219 uwsgi[30246]: rv = self.dispatch_request()
Jul 08 16:37:58 vps262219 uwsgi[30246]: ^^^^^^^^^^^^^^^^^^^^^^^
Jul 08 16:37:58 vps262219 uwsgi[30246]: File "/usr/lib/python3/dist-packages/flask/app.py", line 1796, in dispatch_request
Jul 08 16:37:58 vps262219 uwsgi[30246]: return self.ensure_sync(self.view_functions[rule.endpoint])(**view_args)
Jul 08 16:37:58 vps262219 uwsgi[30246]: ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Jul 08 16:37:58 vps262219 uwsgi[30246]: File "fhost.py", line 500, in fhost
Jul 08 16:37:58 vps262219 uwsgi[30246]: return store_file(
Jul 08 16:37:58 vps262219 uwsgi[30246]: ^^^^^^^^^^^
Jul 08 16:37:58 vps262219 uwsgi[30246]: File "fhost.py", line 378, in store_file
Jul 08 16:37:58 vps262219 uwsgi[30246]: sf, isnew = File.store(f, requested_expiration, addr, ua, secret)
Jul 08 16:37:58 vps262219 uwsgi[30246]: ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Jul 08 16:37:58 vps262219 uwsgi[30246]: File "fhost.py", line 298, in store
Jul 08 16:37:58 vps262219 uwsgi[30246]: with open(p, "wb") as of:
Jul 08 16:37:58 vps262219 uwsgi[30246]: ^^^^^^^^^^^^^
Jul 08 16:37:58 vps262219 uwsgi[30246]: OSError: [Errno 30] Read-only file system: 'up/dc008fcb785e9081579b2619baf354cb2e854c123b39c591eb3ede1e8898f33c'
Jul 08 16:37:58 vps262219 uwsgi[30246]: [pid: 30246|app: 0|req: 3/5] 38.49.164.71 () {38 vars in 562 bytes} [Mon Jul 8 16:37:58 2024] POST / => generated 265 bytes in 13 msecs (HTTP/1.1 500) 2 headers in 99 bytes (3 switches on core 0)

The nginx server block has location /up { internal; }, the dir exists, and the user running uwsgi has rw access to it. I also tried hardcoding the location in config.py but that made no difference, so I changed it back to the default.

Using Debian 12 with python 3.11.2-1+b1, flask 2.2.2-3, uwsgi 2.0.21-5.1, nginx 1.22.1-9.

Where do I go from here?

Thanks

Hi, This is probably a support question rather than a bug. I have been attempting to host 0x0 on a vps. I am pretty familiar with linux administration but I've never used flask or uwsgi before. I followed the instructions at https://uwsgi-docs.readthedocs.io/en/latest/WSGIquickstart.html and https://uwsgi-docs.readthedocs.io/en/latest/Nginx.html. uwsgi and 0x0 are running and I can browse to the homepage: https://file.sney.ca/. However, when I try to upload a file, this happens: ` jesse@bivouac:~/Pictures$ curl -F'file=@doFAZ.png' -Fexpires=24 https://file.sney.ca` `<!doctype html>` `<html lang=en>` `<title>500 Internal Server Error</title>` `<h1>Internal Server Error</h1>` `<p>The server encountered an internal error and was unable to complete your request. Either the server is overloaded or there is an error in the application.</p>` And the following is logged on the server: > Jul 08 16:37:58 vps262219 uwsgi[30246]: [2024-07-08 16:37:58,190] ERROR in app: Exception on / [POST] > Jul 08 16:37:58 vps262219 uwsgi[30246]: Traceback (most recent call last): > Jul 08 16:37:58 vps262219 uwsgi[30246]: File "/usr/lib/python3/dist-packages/flask/app.py", line 2525, in wsgi_app > Jul 08 16:37:58 vps262219 uwsgi[30246]: response = self.full_dispatch_request() > Jul 08 16:37:58 vps262219 uwsgi[30246]: ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ > Jul 08 16:37:58 vps262219 uwsgi[30246]: File "/usr/lib/python3/dist-packages/flask/app.py", line 1822, in full_dispatch_request > Jul 08 16:37:58 vps262219 uwsgi[30246]: rv = self.handle_user_exception(e) > Jul 08 16:37:58 vps262219 uwsgi[30246]: ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ > Jul 08 16:37:58 vps262219 uwsgi[30246]: File "/usr/lib/python3/dist-packages/flask/app.py", line 1820, in full_dispatch_request > Jul 08 16:37:58 vps262219 uwsgi[30246]: rv = self.dispatch_request() > Jul 08 16:37:58 vps262219 uwsgi[30246]: ^^^^^^^^^^^^^^^^^^^^^^^ > Jul 08 16:37:58 vps262219 uwsgi[30246]: File "/usr/lib/python3/dist-packages/flask/app.py", line 1796, in dispatch_request > Jul 08 16:37:58 vps262219 uwsgi[30246]: return self.ensure_sync(self.view_functions[rule.endpoint])(**view_args) > Jul 08 16:37:58 vps262219 uwsgi[30246]: ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ > Jul 08 16:37:58 vps262219 uwsgi[30246]: File "fhost.py", line 500, in fhost > Jul 08 16:37:58 vps262219 uwsgi[30246]: return store_file( > Jul 08 16:37:58 vps262219 uwsgi[30246]: ^^^^^^^^^^^ > Jul 08 16:37:58 vps262219 uwsgi[30246]: File "fhost.py", line 378, in store_file > Jul 08 16:37:58 vps262219 uwsgi[30246]: sf, isnew = File.store(f, requested_expiration, addr, ua, secret) > Jul 08 16:37:58 vps262219 uwsgi[30246]: ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ > Jul 08 16:37:58 vps262219 uwsgi[30246]: File "fhost.py", line 298, in store > Jul 08 16:37:58 vps262219 uwsgi[30246]: with open(p, "wb") as of: > Jul 08 16:37:58 vps262219 uwsgi[30246]: ^^^^^^^^^^^^^ > Jul 08 16:37:58 vps262219 uwsgi[30246]: OSError: [Errno 30] Read-only file system: 'up/dc008fcb785e9081579b2619baf354cb2e854c123b39c591eb3ede1e8898f33c' > Jul 08 16:37:58 vps262219 uwsgi[30246]: [pid: 30246|app: 0|req: 3/5] 38.49.164.71 () {38 vars in 562 bytes} [Mon Jul 8 16:37:58 2024] POST / => generated 265 bytes in 13 msecs (HTTP/1.1 500) 2 headers in 99 bytes (3 switches on core 0) The nginx server block has `location /up { internal; }`, the dir exists, and the user running uwsgi has rw access to it. I also tried hardcoding the location in config.py but that made no difference, so I changed it back to the default. Using Debian 12 with python 3.11.2-1+b1, flask 2.2.2-3, uwsgi 2.0.21-5.1, nginx 1.22.1-9. Where do I go from here? Thanks

mia commented

2024-07-09 20:20:36 +02:00

Owner

You can check whether the systemd unit for uwsgi has any hardening options preventing it from writing to that path.

sney commented

2024-07-10 19:29:15 +02:00

Author

Ah, yes, that was it, the example systemd unit for uwsgi from the debian package had DynamicUser=yes. Thanks for the tip. I am having a different problem now but I'll open a new issue if I can't figure it out.

sney closed this issue

2024-07-10 19:29:15 +02:00

"Read only file system" when uploading #99