modified: Dockerfile

new file:   build_and_push.sh
modified:   init

Script build & tag process.
Make youtube-dl run as regular user.

docker/Dockerfile

@@ -35,16 +35,17 @@ FROM alpine:3.9 as final
 # Copy youtube-dl binary and manpage into container from builder container
 COPY --from=builder_ytdl /usr/local/bin/youtube-dl /usr/local/bin/youtube-dl
 COPY --from=builder_ytdl /usr/local/man/man1/youtube-dl.1 /usr/local/man/man1/youtube-dl.1
-# Install & configure prerequisites for youtube-dl
+# Install & configure s6 overlay, then prerequisites for youtube-dl
 RUN apk update && \
     apk add ffmpeg \
             rtmpdump \
             mplayer \
             mpv \
-            python3 && \
+            python3 \
+            bash && \
     ln -s /usr/bin/python3 /usr/bin/python && \
     youtube-dl --version && \
-    rm -rf /var/cache/apk/*
+    rm -rf /var/cache/apk/* /tmp/*
 # Copy init script, set workdir & entrypoint
 COPY init /init
 WORKDIR /workdir

docker/build_and_push.sh

@@ -0,0 +1,42 @@
+#!/bin/bash -x
+
+# Build "latest"
+docker build . -t ytdl-org/youtube-dl:latest 
+build_exit=$?
+
+
+# Get version of latest container
+# Repeat as running straight after the build can give a 'bad interpreter: Text file busy' error
+n=0
+until [ $n -ge 5 ]
+do
+    build_version=$(docker run --rm -ti ytdl-org/youtube-dl --version) 
+    if [ $? -eq 0 ]; then
+        build_version=$(echo $build_version | sed 's/\r$//')
+        break
+    fi
+    n=$[$n+1]
+    sleep 15
+done
+if [ $n -ge 5 ]; then
+    echo "Failed when trying to get youtube-dl version in latest container :("
+    exit 1
+fi
+
+# If the build was successful, then we can tag with current version
+if [ $build_exit -eq 0 ]; then
+    docker tag ytdl-org/youtube-dl:latest ytdl-org/youtube-dl:$build_version
+    tag_exit=$?
+fi
+
+if [ $build_exit -eq 0 ]; then
+    if [ $tag_exit -eq 0 ]; then
+        # If building and tagging was successful, then push
+        docker push ytdl-org/youtube-dl:latest
+        docker push ytdl-org/youtube-dl:$build_version
+        exit 0
+    fi
+fi
+
+echo "Something went wrong..."
+exit 1

docker/init

@@ -1,16 +1,17 @@
-#!/bin/sh
+#!/bin/bash
+
+export YOUTUBEDLARGS=$@
+
+YOUTUBEDLPGID=${PGID:-1000}
+YOUTUBEDLPUID=${PUID:-1000}
 
 # Create dockeruser user/group
-addgroup -g $PGID dockeruser
+addgroup -g $YOUTUBEDLPGID dockeruser
-adduser -D -u $PUID -G dockeruser -h /home/dockeruser dockeruser
+adduser -D -u $YOUTUBEDLPUID -G dockeruser -h /home/dockeruser dockeruser
-chown $PUID:$PGID /home/dockeruser
+chown $YOUTUBEDLPUID:$YOUTUBEDLPGID /home/dockeruser
-
+export HOME=/home/dockeruser
-# Change ownership of youtube-dl and set sticky bit so youtube-dl runs as dockeruser (rootless operation)
-chown $PUID:$PGID `which youtube-dl`
-chmod u+s,g+s `which youtube-dl`
-
-# Ensure .netrc has correct permissions (if present)
-chown root:root /root/.netrc
 
 # Run youtube-dl with remainder of command line arguments
-youtube-dl $@
+su -m dockeruser <<'EOF'
+youtube-dl $YOUTUBEDLARGS
+EOF