podman: don't use podman in podman but pass a socket

By setting `CONTAINER_SOCK` prior to running `podman-compose up` the
socket path is passed into the worker container and `CONTAINER_HOST` is
automatically set. The workers then use `podman` to build images instead
of running it *bare metal*. One should set `PUBLIC_PATH`, too, which
points to the place where to store images and json files.

Signed-off-by: Paul Spooren <mail@aparcar.org>

README.md

@@ -75,7 +75,10 @@ Once Podman works, install `podman-compose`:
 
 Now it's possible to run all services via `podman-compose`:
 
-    mkdir -p ./asu-service/public/
+    # where to store images and json files
+    export PUBLIC_PATH=$(pwd)/public
+    # absolute path to podman socket mounted into worker containers
+    export CONTAINER_SOCK=/run/user/1001/podman/podman.sock
     podman-compose up -d
 
 This will start the server, the Podman API container and two workers. The first
@@ -105,6 +108,8 @@ the dependencies:
 
 #### Running a worker
 
+    # podman unix socket (not path), no need to mount anything
+    export CONTAINER_HOST=unix:///run/user/1001/podman/podman.sock
     poetry run rq worker
 ### API
 

podman-compose.yml

@@ -1,60 +1,52 @@
 version: "2"
+
 volumes:
-  podman-sock:
   redis:
+
 services:
   server:
-    image: "localhost/aparcar/asu:latest"
+    image: "asu:latest"
     build:
       context: ./
       dockerfile: Containerfile
     environment:
       - REDIS_URL=redis://redis/
-    volumes:
-      - "./asu-service/public/:/app/public/:rw"
+      - ALLOW_DEFAULTS
+      - PUBLIC_PATH
     ports:
       - "127.0.0.1:8000:8000"
     depends_on:
       - redis
 
   worker:
-    image: "localhost/aparcar/asu:latest"
+    image: "asu:latest"
     build:
       context: ./
       dockerfile: Containerfile
-    command: rqworker --url "redis://redis"
+    command: rqworker
     environment:
-      - CONTAINER_HOST=unix:///tmp/socket/podman.sock
+      - CONTAINER_HOST=unix://$CONTAINER_SOCK
       - REDIS_URL=redis://redis/
     volumes:
-      - ./asu-service/public/:/app/public/:rw
-      - podman-sock:/tmp/socket/:rw
+      - $PUBLIC_PATH:$PUBLIC_PATH:rw
+      - $CONTAINER_SOCK:$CONTAINER_SOCK:rw
     depends_on:
       - redis
-      - podman
 
   worker2:
-    image: "localhost/aparcar/asu:latest"
+    image: "asu:latest"
     build:
       context: ./
       dockerfile: Containerfile
-    command: rqworker --url "redis://redis"
+    command: rqworker
     environment:
-      - CONTAINER_HOST=unix:///tmp/socket/podman.sock
+      - CONTAINER_HOST=unix://$CONTAINER_SOCK
       - REDIS_URL=redis://redis/
     volumes:
-      - ./asu-service/public/:/app/public/:rw
-      - podman-sock:/tmp/socket/:rw
+      - $PUBLIC_PATH:$PUBLIC_PATH:rw
+      - $CONTAINER_SOCK:$CONTAINER_SOCK:rw
     depends_on:
       - redis
-      - podman
-
-  podman:
-    image: quay.io/podman/stable
-    user: podman
-    volumes:
-      - podman-sock:/tmp/socket/
-    command: sh -c "mkdir -p /tmp/socket && podman system service --time=0 unix:///tmp/socket/podman.sock"
 
   redis:
     image: "docker.io/redis:alpine"