new: [monujo] prioritize between explicit and implicit options and check for mandatory option

- enforce specifying lokapi-db in a way or another
- explicit options have priority
- add documentation on the topic and examples

Signed-off-by: Valentin Lab <valentin.lab@kalysto.org>

monujo/README.org

@@ -0,0 +1,145 @@
+# -*- ispell-local-dictionary: "english" -*-
+
+#+TITLE: Monujo charm
+
+* Usage
+
+=monujo= service needs to know how to reach it's administrative backend.
+So either you specify one by yourself:
+
+#+begin_src yaml
+monujo:
+  options:
+    lokapi-host: http://admin.mycur.org
+    #lokapi-db: odoo ## Default: 'odoo'
+
+#+end_src
+
+Either you can provide in sibling services an =odoo-server= providing
+service. It'll then discover it and use it by default as administrative
+backend.
+
+#+begin_src yaml
+monujo:
+
+odoo:
+#+end_src
+
+Note that =monujo= charm is describing a subordinate service, meaning
+that it'll run in an existing service providing =publish-dir= relation
+(creating one if not available).
+
+By default, =lokapi-db= if not set will be infered from option =dbname=
+in the relation =odoo-server=, or default database from =odoo-server=.
+
+So all these are equivalent:
+
+#+begin_src yaml
+monujo:
+  options:
+    lokapi-db: foo
+
+odoo:
+#+end_src
+
+#+begin_src yaml
+monujo:
+  relations:
+    odoo-server:
+      odoo:
+        dbname: foo
+
+odoo:
+#+end_src
+
+
+#+begin_src yaml
+monujo:
+
+odoo:
+  relations:
+    postgres-database:
+      postgres:
+        dbname: foo
+#+end_src
+
+
+** Map
+
+=monujo= optionaly can add a link to a map. If you want to do so, either
+add it explicitly, or add it automatically. This is the explicit way:
+
+#+begin_src yaml
+monujo:
+  options:
+    map-url: http://map.mycur.org
+
+#+end_src
+
+The map will be added automatically if a =map-server= provider is
+found (=gogocarto= charm creates services that provides =map-server=
+relations).
+
+#+begin_src yaml
+monujo:
+
+gogocarto:
+
+#+end_src
+
+
+** Theming
+
+This charm allows to write all the =config.json=, here's the default
+fully valued options as of version =1.0.0-rc.3= of monujo:
+
+#+begin_src yaml
+monujo:
+  options:
+    lokapi-host: example.org
+    lokapi-db: odoo
+    map-url: https://carte.example.org
+    help-url: https://help.com
+    cgu-url: https://cgu.com
+    local-password-retention-time: 900
+    logo-url: https://example.com/img/logo.png
+    login-logo-url: https://example.com/img/logo-2.png
+    theme:
+      color-1: "#e4f2f1"
+      color-2: "#009688"
+      top-menu-background-color: "#fefefe"
+      top-menu-link-color: "#4a4a4a"
+      top-menu-link-background-color: white
+      top-menu-link-background-color-bg: white
+      top-menu-link-hover-color: "#777777"
+      top-menu-link-hover-color-bg: "#848484"
+      top-menu-link-hover-background-color: whitesmoke
+      top-menu-dropdown-divider-color: whitesmoke
+      btn-payer-text-color: "#ffffff"
+      btn-payer-border-color: $color-2
+      btn-payer-background-color: $color-2
+      btn-recevoir-text-color: "#ffffff"
+      btn-recevoir-border-color: $color-2
+      btn-recevoir-background-color: $color-2
+      btn-recharger-text-color: $color-2
+      btn-recharger-border-color: $color-2
+      btn-recharger-background-color: "#ffffff"
+      btn-login-text-color: "#ffffff"
+      btn-login-border-color: $color-2
+      btn-login-background-color: $color-2
+      inner-card-background-color: "#f0faf9"
+      inner-card-border-color: "#f0faf9"
+      inner-card-text-color: "#4a4a4a"
+      inner-card-text-color-backend: "#242424"
+      inner-card-label-background-color: transparent
+      inner-card-label-text-color: "#4a4a4a"
+      inner-card-alt-text-color: "#009688"
+      body-size: 14px
+      tabs-border-bottom-color: white
+      tabs-border-bottom-width: 4px
+      tabs-link-hover-border-bottom-color: $color-2
+      tabs-link-active-color: rgba(0 0 0 0.8)
+      tabs-link-active-border-bottom-color: $color-2
+      tabs-link-color: rgba(0 0 0 0.6)
+      navbar-fixed-z: 50
+#+end_src

monujo/hooks/pre_deploy

@@ -5,25 +5,44 @@
 
 set -e
 
-if service:traverse "${SERVICE_NAME}":odoo-server >/dev/null; then
+if ! admin_backend=$(options-get "lokapi-host" 2>/dev/null) || [ -z "$admin_backend" ]; then
+
+    if ! service:traverse "${SERVICE_NAME}":odoo-server >/dev/null; then
+        err "Monujo requires either a ${WHITE}lokapi-host${NORMAL} option set,"
+        echo "  or a ${DARKCYAN}odoo-server${NORMAL} relation satisfied." >&2
+        exit 1
+    fi
     if ! url=$(relation:get "${SERVICE_NAME}":odoo-server:web-proxy url); then
         err "Monujo doesn't support odoo-server not having a web-proxy yet."
         exit 1
     fi
-    if ! dbname=$(relation:get "${SERVICE_NAME}":odoo-server:postgres-database dbname); then
-        err "Can't find db name of our odoo-server relation."
+
+    monujo:config_merge "{
+        \"lokapiHost\": \"$url\"
+    }"
+
+    if ! dbname=$(options-get "lokapi-db" 2>/dev/null) || [ -z "$dbname" ]; then
+        if ! dbname=$(relation:get "${SERVICE_NAME}":odoo-server dbname) || [ -z "$dbname" ]; then
+            err "Can't find db name of our ${DARKCYAN}odoo-server${NORMAL} relation."
+            if ! dbname=$(relation:get "${SERVICE_NAME}":odoo-server:postgres-database dbname) || [ -z "$dbname" ]; then
+                err "Can't find db name of ${DARKCYAN}odoo-server${NORMAL}-->${DARKCYAN}postgres-database${NORMAL} relation."
                 exit 1
             fi
+        fi
         monujo:config_merge "{
-      \"lokapiHost\": \"$url\",
             \"lokapiDb\": \"$dbname\"
         }"
+
+    fi
+
 fi
 
 
+if ! map_url=$(options-get "map-url" 2>/dev/null) || [ -z "$map_url" ] ; then
 
     if map_url=$(relation:get "${SERVICE_NAME}":map-server:publish-dir url); then
         monujo:config_merge "{
           \"mapUrl\": \"$map_url\"
         }"
     fi
+fi