Use variable for datastore in Docker entrypoint

Dockerfile

@@ -62,7 +62,8 @@ RUN sed -i 's/^CipherString = .*/CipherString = DEFAULT@SECLEVEL=1/' /etc/ssl/op
 
 # Copy modules over to the final image and add their dir to PYTHONPATH
 COPY --from=builder /dependencies /usr/local
-ENV PYTHONPATH=/usr/local
+ENV PYTHONPATH=/usr/local \
+    DATASTORE_DIR="/datastore"
 
 EXPOSE 5000
 

docker-entrypoint.sh

@@ -2,9 +2,11 @@
 
 set -eu
 
+DATASTORE_DIR="${DATASTORE_DIR:-/datastore}"
+
 # If the first argument looks like a flag, assume we want to run changedetection
 if [ "${1:0:1}" = '-' ]; then
-    set -- python ./changedetection.py -d /datastore "$@"
+    set -- python ./changedetection.py -d "$DATASTORE_DIR" "$@"
 fi
 
 # If we're running as root, by default make sure process uid/gid
@@ -18,7 +20,7 @@ if [ "$(id -u)" = '0' -a -n "${KEEP_PRIVILEGES:-}" ]; then
     usermod -o -u "$PUID" changedetection
 
     # Look for files in datadir not owned by the correct user and chown them
-    find "/datastore" \! -user changedetection -exec chown changedetection '{}' +
+    find "$DATASTORE_DIR" \! -user changedetection -exec chown changedetection '{}' +
 
     # Restart this script as an unprivileged user
     exec gosu changedetection:changedetection "$BASH_SOURCE" "$@"