fix: [postgres] don't rely on host.

We were using ``lsof`` and ``pgm`` on host for some managing purpose. As
we want to be able to use ``compose`` from a docker container, these
got removed in favor of portable solutions.

postgres/build/Dockerfile

@@ -0,0 +1,40 @@
+## is a simple copy of postgres:10-alpine
+FROM docker.0k.io/postgres:10-alpine as common
+
+
+FROM common AS builder
+
+
+RUN apk -U add alpine-sdk curl
+RUN adduser -D packager && addgroup packager abuild
+
+ENV MBUFFER_APKBUILD_URL=https://git.alpinelinux.org/cgit/aports/plain/testing/mbuffer/APKBUILD?id=026cabf316eb477b2ae3e26dadc3e9c30ff26626
+
+
+USER packager
+
+RUN mkdir -p /tmp/build && \
+    curl -L "${MBUFFER_APKBUILD_URL}" > /tmp/build/APKBUILD
+
+RUN cd /tmp/build && \
+    sed -ri 's/^(\s+make -j1 check.*)/#\1/g' APKBUILD && \
+    abuild-keygen -a -i && \
+    abuild -r
+
+USER root
+
+RUN apk add curl
+
+RUN curl -L https://github.com/0k/pgm/raw/master/bin/pgm > /bin/pgm && \
+    chmod +x /bin/pgm
+
+FROM common
+
+RUN apk -U add pv python file
+
+COPY --from=builder /home/packager/packages/tmp/x86_64/*.apk /tmp/
+COPY --from=builder /bin/pgm /bin
+
+RUN apk add /tmp/mbuffer-2018*.apk --allow-untrusted
+
+RUN ln -sf /usr/bin/mbuffer /usr/bin/buffer

postgres/lib/common

@@ -8,27 +8,7 @@ export DB_PASSFILE=/root/.pgpass
 
 
 is_db_locked() {
-    require lsof || apt-get install -y lsof </dev/null || {
-            err "Couldn't install command 'lsof'."
-            return 1
-        }
-
-    # "$lsof" +D "$host_db_working_dir" || true
-
-    ## We need:
-    ##  1- to protect against set -e
-    ##  2- to detect if errorlevel 1 because lsof failed for good reason: permissions error, directory not found
-    ##  3- to detect if errorlevel 1 because no process found
-
-    [ -d "$host_db_working_dir" ] || {
-        err "Directory '$host_db_working_dir' not found. Might be normal at this stage."
-        return 1
-    }
-
-    ## We choose to ignore (2), and use stdout emptyness to ensure (3)
-    open_files=$(lsof +D "$host_db_working_dir") || true
-
-    [ "$open_files" ]
+    is_volume_used "$DATASTORE/${SERVICE_NAME}"
 }
 
 
@@ -102,19 +82,25 @@ db_change_password() {
     ddb < <(echo "ALTER USER $user WITH PASSWORD '$password';")
 }
 
+
+PGM() {
+    ensure_db_docker_running </dev/null || return 1
+
+    ## XXXvlab: Here we should have been able to use this, but
+    ## pgm requires the ``prefix_pg_local_command=' '`` hack. As
+    ## soon this is fixed, we can re
+    #dcmd /bin/sh pgm "$@"
+    echo docker run -i --rm \
+           $db_docker_opts -e prefix_pg_local_command=' ' \
+           --entrypoint pgm "$DOCKER_BASE_IMAGE" $db_cmd_opts "$@" >&2
+
+    docker run -i --rm \
+           $db_docker_opts -e prefix_pg_local_command=' ' \
+           --entrypoint pgm "$DOCKER_BASE_IMAGE" $db_cmd_opts "$@"
+
+}
+
 db_grant_rights () {
     local dbname="$1" user="$2"
-    require psql || apt-get install -y postgresql-client </dev/null
-    require pgm || {
-        (
-            cd /opt/apps
-            git clone https://github.com/0k/pgm.git
-            ln -sf /opt/apps/pgm/bin/* /usr/local/bin/
-            apt-get install -y --force-yes pv buffer < /dev/null
-            # cd /opt/apps/0k-docker
-            # git checkout master
-        )
-    }
-    debug PGHOST="$DOCKER_IP" PGUSER=postgres pgm chown "$user" "$dbname"
-    PGHOST="$DOCKER_IP" PGUSER=postgres prefix_pg_local_command=" " pgm chown "$user" "$dbname"
+    PGM chown "$user" "$dbname"
 }

postgres/metadata.yml

@@ -1,5 +1,4 @@
 summary: "Postgres server"
 maintainer: "Valentin Lab <valentin.lab@kalysto.org>"
-docker-image: docker.0k.io/postgres:10-alpine
 data-resources:
   - /var/lib/postgresql/data