feature: support run as uid and pid

Dockerfile

@@ -7,5 +7,11 @@ WORKDIR /bing
 COPY requirements.txt requirements.txt
 RUN pip3 install -r requirements.txt
 COPY src/ .
+COPY entrypoint.sh .
+RUN chmod +x entrypoint.sh
 
-CMD [ "python3", "app.py", "--service-mode"]
+RUN apt-get update && apt-get install -y \
+    gosu \
+    && rm -rf /var/lib/apt/lists/*
+
+ENTRYPOINT ["/bing/entrypoint.sh", "python3", "app.py", "--service-mode"]

README.md

@@ -61,14 +61,19 @@ All args can be read from environment variables, the environment variables with
 
 ## Docker Usage
 
-Run as service and periodically scan new wallpaper:
+Run as service and periodically scan new wallpaper.
+
+
+Note that bing-dl runs as UID 1000 and GID 1000 by default. These may be altered with the `PUID` and `PGID` environment variables.
 
 ```shell
 docker run -d \
   -e BING_SCAN_INTERVAL=3600 \
   -e [email protected] \
   -e [email protected] \
   -e BING_NOTIFY_USER_PASS=password \
+  -e PUID=1000 \
+  -e PGID=1000 \
   -v /path/to/storage/folder:/bing/storage \
   -v /path/to/download/folder:/bing/download \
   littleneko/bing-dl:latest

entrypoint.sh

@@ -0,0 +1,16 @@
+#! /bin/sh
+
+set -eu
+
+PUID=${PUID:-1000}
+PGID=${PGID:-1000}
+
+if ! getent group "$PGID" >/dev/null; then
+  groupadd -g "$PGID" bing
+fi
+
+if ! getent passwd "$PUID" >/dev/null; then
+  useradd -u "$PUID" -g "$PGID" -m bing
+fi
+
+exec gosu "$PUID":"$PGID" "$@"