Add setup script

The container setup script copies the Roundcube configuration files in
place, from the /etc/roundcube directory, and runs database migrations
if necessary.

Dockerfile

@@ -3,6 +3,7 @@ FROM bitnami/minideb:stretch
 COPY conf /tmp/conf
 COPY build/src /var/www/webmail
 COPY build.sh /tmp/build.sh
+COPY start.sh /start.sh
 #COPY install-roundcube /tmp/install-roundcube
 RUN /tmp/build.sh && rm -fr /tmp/build.sh /tmp/conf
 

conf/apache2/sites-available/webmail.conf

 <VirtualHost *:84>
 
-        ServerName webmail.${DOMAIN}
-        ServerAlias *.webmail.${DOMAIN}
+        ServerName ${SHARD_ID}.webmail.${DOMAIN}
 
         DocumentRoot /var/www/webmail
 

conf/chaperone.d/chaperone.conf

+apache2_setup.service: {
+    type: oneshot,
+    stdout: inherit,
+    service_groups: INIT,
+    process_timeout: 600,
+    command: "/start.sh",
+}
+
 apache2.service: {
     command: "bash -c 'source /etc/apache2/envvars && exec /usr/sbin/apache2 -DFOREGROUND'",
-    kill_signal: SIGWINCH
+    kill_signal: SIGWINCH,
+    exit_kills: true,
 }
 
 fpm.service: {
-    command: "/usr/sbin/php-fpm7.0 --force-stderr --nodaemonize"
+    command: "/usr/sbin/php-fpm7.0 --force-stderr --nodaemonize",
+    exit_kills: true,
 }
 
-#fakemail.service: {
-#    command: "python3 -m smtpd -n -c DebuggingServer 0.0.0.0:25",
-#    env_set: {
-#        'PYTHONUNBUFFERED': '1'
-#    }
-#}
-
 console.logging: {
     selector: '*.warn',
     stdout: true,

start.sh

@@ -34,7 +34,7 @@ install_config() {
 
 setup_database() {
     # The current Roundcube version is stored in the database.
-    local cur_version=$(mysql -NBe 'select version from rc_version' ${MYSQL_DB} 2>/dev/null)
+    cur_version=$(mysql -NBe 'select version from rc_version' ${MYSQL_DB} 2>/dev/null)
 
     # If cur_version is empty, it means that the database has not been
     # initialized yet.
@@ -53,6 +53,17 @@ setup_database() {
 set -e
 set -u
 
+# Abort if some fundamental environment variables are not defined.
+# This is nicer than having Apache die with an error.
+if [ -z "${DOMAIN}" ]; then
+    echo "ERROR: The 'DOMAIN' environment variable is not defined" >&2
+    exit 1
+fi
+if [ -z "${SHARD_ID}" ]; then
+    echo "ERROR: The 'SHARD_ID' environment variable is not defined" >&2
+    exit 1
+fi
+
 install_config
 setup_database