new: [mongo] new charm

mongo/build/Dockerfile

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+## Note: alpine version >= 3.9 is required to get mongodb version 4
+## is a simple copy of alpine:3.9
+FROM docker.0k.io/alpine:3.9 as common
+
+RUN apk add --no-cache mongodb
+
+RUN mkdir -p /var/lib/mongod
+RUN chown -R mongodb:mongodb /var/lib/mongod
+
+VOLUME ["/var/lib/mongodb"]
+EXPOSE 27017 28017
+
+USER mongodb
+
+ENTRYPOINT [ "mongod", "--config", "/etc/mongod.conf" ]
+
+

mongo/hooks/init

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+#!/bin/bash
+
+## Init is run on host
+## For now it is run every time the script is launched, but
+## it should be launched only once after build.
+
+## Accessible variables are:
+## - SERVICE_NAME        Name of current service
+## - DOCKER_BASE_IMAGE   Base image from which this service might be built if any
+## - SERVICE_DATASTORE           Location on host of the DATASTORE of this service
+## - SERVICE_CONFIGSTORE         Location on host of the CONFIGSTORE of this service
+
+. lib/common
+
+set -e
+
+uid=$(docker_get_uid "$SERVICE_NAME" "mongodb")
+
+CONFIG=$SERVICE_CONFIGSTORE/etc/mongod.conf
+
+mkdir -p "$(dirname "$CONFIG")"
+## XXXvlab: replication here is hardwired and not handled at all
+cat <<EOF > "$CONFIG"
+storage:
+  dbPath: /var/lib/mongodb
+net:
+  bindIp: 0.0.0.0
+replication:
+  oplogSizeMB: 128
+  replSetName: rs01
+EOF
+chown -v "$uid" "$CONFIG"
+
+
+dirs=(/var/{log,lib}/mongodb )
+host_dirs=()
+for dir in "${dirs[@]}"; do
+    host_dirs+=("$SERVICE_DATASTORE$dir")
+done
+
+mkdir -p "${host_dirs[@]}"
+find "${host_dirs[@]}" \! -user "$uid" \
+     -exec chown -v "$uid" {} + || true
+
+
+config_hash=$(cat "$CONFIG" | md5_compat) || exit 1
+init-config-add "
+$MASTER_BASE_SERVICE_NAME:
+  labels:
+    - compose.config_hash=$config_hash
+"

mongo/hooks/mongo_database-relation-joined

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+#!/bin/bash
+
+. lib/common
+
+set -e
+
+DBNAME=$(relation-get dbname) || {
+    DBNAME="${BASE_SERVICE_NAME//\./_}"
+    relation-set dbname "$DBNAME"
+}
+
+
+cmd="rs.initiate({ _id: 'rs01', members: [ { _id: 0, host: '$TARGET_SERVICE_NAME:27017' } ]})"
+debug "${WHITE}running:$NORMAL $cmd"
+
+out=$(ddb < <(echo "use $DBNAME";
+              echo "$cmd"))
+
+if [[ "$out" == *"\"codeName\" : \"AlreadyInitialized\""* ]]; then
+    exit 0
+fi
+
+if [[ "$out" == *"\"ok\" : 1"* ]]; then
+    exit 0
+fi
+
+err Replicate Set initialisation failed
+echo "$out" >&2
+

mongo/lib/common

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+# -*- mode: shell-script -*-
+
+include pretty
+
+export DB_NAME="$SERVICE_NAME"                          ## general type of database (ie: postgres/mysql...)
+export DB_DATADIR=/var/lib/mongodb
+
+export DATA_DIR=$SERVICE_DATASTORE$DB_DATADIR
+
+
+is_db_locked() {
+    is_volume_used "$DATASTORE/${SERVICE_NAME}"
+}
+
+
+_set_server_db_params() {
+    server_docker_opts+=("-v" "${SERVICE_CONFIGSTORE}/etc/mongod.conf:/etc/mongod.conf"
+                         "--add-host" "${SERVICE_NAME}:127.0.0.1")
+}
+
+_set_db_params() {
+    local docker_ip="$1" docker_network="$2"
+
+    db_docker_opts+=("--network" "$docker_network")
+
+    db_cmd_opts+=("--host" "$docker_ip")
+    check_command="db.serverStatus().ok"
+}
+
+ddb () { dcmd mongo "$@"; }

mongo/metadata.yml

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+summary: "MongoDB server"
+maintainer: "Valentin Lab <valentin.lab@kalysto.org>"
+data-resources:
+  - /var/lib/mongodb
+config-resources:
+  - /etc/mongod.conf
+provides:
+  mongo-database: