Fixed #24: chown data folders to www-data

- on start, unless `NO_CHOWN_DATA` is set, must-be-writable folders are chown'd to www-data/www-data
- Base python image updated to bookworm

edupi/Dockerfile

@@ -24,7 +24,7 @@ RUN npm -g install bower && \
     python3 ./manage.py bower install && \
     python3 ./manage.py collectstatic --noinput
 
-FROM python:3.8.14-slim-bullseye
+FROM python:3.8-slim-bookworm
 LABEL org.opencontainers.image.source https://github.com/offspot/container-images
 
 EXPOSE 80
@@ -33,6 +33,7 @@ VOLUME /data
 ENV ADMIN_USERNAME ""
 ENV ADMIN_PASSWORD ""
 ENV SRC_DIR "#"
+ENV NO_CHOWN_DATA ""
 
 RUN apt-get update -y && \
     apt-get install -y --no-install-recommends libmagic1 ghostscript libmagickwand-dev nginx curl && \

edupi/README.md

@@ -26,6 +26,7 @@ No configuration is required but you'll likely want to set some of the following
 | `ADMIN_USERNAME` | Username of the *admin* user. Requires setting the password. |
 | `ADMIN_PASSWORD` | Password of the *admin* user.                                |
 | `SRC_DIR`        | In-container path of the folder to import files from.        |
+| `NO_CHOWN_DATA`  | Don't chown www-data:www-data folders in `/data` on start    |
 
 Note that registered users access the special UI at [`/custom`](http://localhost/custom). A link is only present on homepage is there is no imported data.
 
@@ -38,10 +39,16 @@ If you want to persist EduPi's data, you'll need to bind some paths to a persist
 | Path         | Usage                                                        |
 | --- | --- |
 | `/data`                      | All user-modifiable data |
-| `/data/database`              | Only EduPi's database (SQLite) |
+| `/data/database`             | Only EduPi's database (SQLite) |
 | `/data/media`                | EduPi's files are stored here. Their thumbnails inside a `thumbnails` sub-folder |
 | `/data/log`                  | nginx's access logs |
 | `/data/stats`                | EduPi's statistics based off (on-demand) reading of nginx log |
 | `/var/lib/edupi/favicon.ico` | Default EduPi favicon |
 
 **Important**: when importing existing content (via `SRC_DIR` environ), make sure to mount that source directory in the same bound volume as `/data/media` so that files are moved effisciently.
+
+### Permissions
+
+Web-servers (uwsgi and nginx) runs as user `www-data`/`www-data`. `/data/*` thus needs to be writable by these processes.
+To ensure this, the container will chown those folders on start.
+If you don't want this chown to happen (and ensure perms are correct yourself), set the `NO_CHOWN_DATA` environment variable.

edupi/entrypoint.py

@@ -1,28 +1,58 @@
 #!/usr/local/bin/python3
 
+import grp
 import os
 import pathlib
+import pwd
 import shutil
 import subprocess
 import sys
 
+SKIP_CHOWN = bool(os.getenv("NO_CHOWN_DATA"))
 
 def ensure_folders():
     root = pathlib.Path("/data")
     stat = root.stat()
 
-    for folder in ("database", "media", "stats", "log"):
+    folders = ("database", "media", "stats", "log")
+
+    for folder in folders:
         path = root.joinpath(folder)
         try:
             path.mkdir(parents=True)
         except FileExistsError:
-            continue
+            pass
         else:
             try:
                 os.chown(path, stat.st_uid, stat.st_gid)
             except Exception as exc:
                 print(f"Unable to change owner of created {path}: {exc}")
 
+    if not SKIP_CHOWN:
+        username = "www-data"
+        groupname = "www-data"
+        try:
+            user = pwd.getpwnam(username)[2]
+        except KeyError:
+            print(f"Unable to get uid of user {username}")
+            return
+
+        try:
+            group = grp.getgrnam(groupname)[2]
+        except KeyError:
+            print(f"Unable to get gid of group {groupname}")
+            return
+
+        for folder in folders:
+            path = root.joinpath(folder)
+            try:
+                os.chown(path, user, group)
+            except Exception as exc:
+                print(f"Unable to change ownership of {path}: {exc}")
+                continue
+
+
+
 
 def start_nginx():
     if os.getenv("NO_NGINX"):

edupi/nginx.conf

@@ -1,4 +1,4 @@
-user www-data;
+user www-data www-data;
 worker_processes auto;
 pid /run/nginx.pid;