Fix permissions issue with data dir

If the mounted data directory on the host is owned by root, the znc user
within the container would fail to write any settings to disk.

Hence this changes ownership of the data directory to the znc user (Uid:
1000) and znc group (Gid: 1000) from within the container.

Dockerfile

@@ -13,7 +13,6 @@ ADD         start-znc /usr/local/bin/
 ADD         znc.conf.default /src/
 RUN         chmod 644 /src/znc.conf.default
 
-USER        znc
 EXPOSE      6667
 ENTRYPOINT  ["/usr/local/bin/start-znc"]
 CMD         [""]

bootstrap.sh

@@ -6,8 +6,13 @@ set -e
 ZNC_VERSION="1.4"
 
 
-# Install build dependencies.
+# Ensure package list is up to date.
 apt-get update
+
+# Install runtime dependencies.
+apt-get install -y sudo
+
+# Install build dependencies.
 apt-get install -y wget build-essential libssl-dev libperl-dev pkg-config
 
 

start-znc

@@ -27,5 +27,9 @@ if [ ! -f "${DATADIR}/configs/znc.conf" ]; then
   cp /src/znc.conf.default "${DATADIR}/configs/znc.conf"
 fi
 
+# Make sure $DATADIR is owned by znc user. This effects ownership of the
+# mounted directory on the host machine too.
+chown -R znc:znc "$DATADIR"
+
 # Start ZNC.
-exec znc --foreground --datadir="$DATADIR" $@
+exec sudo -u znc znc --foreground --datadir="$DATADIR" $@