Added UID parameter and some additional changes

  - Added UID argument to the dockerfile
  - Added warning in case fs permissions can't be automatically set

alpine/Dockerfile

@@ -3,6 +3,7 @@ FROM node:8.15.1-alpine
 # Build arguments to change source url, branch or tag
 ARG CODIMD_REPOSITORY=https://github.com/codimd/server.git
 ARG VERSION=master
+ARG UID=10000
 
 # Set some default config variables
 ENV DOCKERIZE_VERSION=v0.6.1
@@ -76,7 +77,7 @@ RUN apk add --no-cache --virtual .dep build-base openssl-dev python git jq bash
     yarn install && \
     yarn cache clean && \
     apk del .dep && \
-    adduser -u 10000 -h /codimd/ -D -S codimd && \
+    adduser -u $UID -h /codimd/ -D -S codimd && \
     chown -R codimd /codimd/
 
 WORKDIR /codimd

debian/Dockerfile

@@ -3,6 +3,7 @@ FROM node:8.15.1
 # Build arguments to change source url, branch or tag
 ARG CODIMD_REPOSITORY=https://github.com/codimd/server.git
 ARG VERSION=master
+ARG UID=10000
 
 # Set some default config variables
 ENV DEBIAN_FRONTEND noninteractive
@@ -67,7 +68,7 @@ RUN apt-get update && \
     apt-get remove -y --auto-remove build-essential git jq && \
     apt-get clean && apt-get purge && rm -r /var/lib/apt/lists/* && \
     # Create codimd user
-    adduser --uid 10000 --home /codimd/ --disabled-password --system codimd && \
+    adduser --uid $UID --home /codimd/ --disabled-password --system codimd && \
     chown -R codimd /codimd/
 
 WORKDIR /codimd

resources/docker-entrypoint.sh

 #!/bin/sh
 
 # Use gosu if the container started with root privileges
-[ $(id -u) -eq 0] && GOSU="gosu codimd" || GOSU=""
+UID=$(id -u)
+[ $UID -eq 0] && GOSU="gosu codimd" || GOSU=""
 
 if [ "$HMD_DB_URL" != "" ] && [ "$CMD_DB_URL" = "" ]; then
     CMD_DB_URL="$HMD_DB_URL"
@@ -43,10 +44,27 @@ $GOSU ./node_modules/.bin/sequelize db:migrate
     ";
 } ; }
 
-# Change owner and permission if filesystem backend is used
-if [ -z $GOSU && "$CMD_IMAGE_UPLOAD_TYPE" = "filesystem" ]; then
-    chown -R codimd ./public/uploads
-    chmod 700 ./public/uploads
+# Change owner and permission if filesystem backend is used and user has root permissions
+if [ $UID -eq 0 && "$CMD_IMAGE_UPLOAD_TYPE" = "filesystem" ]; then
+    if [ $UID -eq 0 ]; then
+        chown -R codimd ./public/uploads
+        chmod 700 ./public/uploads
+    else
+        echo "
+            #################################################################
+            ###                                                           ###
+            ###                        !!!WARNING!!!                      ###
+            ###                                                           ###
+            ###        Container was started without root permissions     ###
+            ###           and filesystem storage is being used.           ###
+            ###        In case of filesystem errors these need to be      ###
+            ###                      changed manually                     ###
+            ###                                                           ###
+            ###                       !!!WARNING!!!                       ###
+            ###                                                           ###
+            #################################################################
+        ";
+    fi
 fi
 
 # Sleep to make sure everything is fine...