add: schema migration scripts

Dockerfile

@@ -8,6 +8,7 @@ RUN apt-get update -yqq \
     && locale-gen en_US.UTF-8 \
     && cd /opt/ \
     && wget -qO- https://repo1.maven.org/maven2/org/flywaydb/flyway-commandline/6.0.0/flyway-commandline-6.0.0-linux-x64.tar.gz | tar xvz \
+    && sudo chmod +x /opt/flyway-6.0.0/flyway \
     && sudo ln -s /opt/flyway-6.0.0/flyway /usr/local/bin
 
 ENV LANG=en_US.UTF-8 \

schema_migration.sh

@@ -0,0 +1,24 @@
+#!/usr/bin/env bash
+
+sqlite_return=$(sqlite3 core.sqlite "SELECT version_num FROM meta LIMIT 1;" 2>/dev/null);
+
+if ! [[ $sqlite_return =~ ^-?[0-9]+$ ]]
+then
+  echo "No version number found. Initiating database."
+  sqlite_return=0;
+fi;
+
+version_num=$sqlite_return;
+
+while [ -f sql/migration_$version_num.sql ]
+do
+  sqlite3 core.sqlite < sql/migration_$version_num.sql;
+  ((version_num++));
+done;
+
+if [ $sqlite_return -eq 0 ]
+then
+  sqlite3 core.sqlite "INSERT INTO meta (version_num) VALUES ($version_num); ";
+else
+  sqlite3 core.sqlite "UPDATE meta SET version_num=$version_num;";
+fi

sql/migration_0.sql

@@ -0,0 +1,38 @@
+create table meta
+(
+    version_num int not null
+);
+
+create table controllers
+(
+    id          VARCHAR(33) not null
+        primary key
+        unique,
+    name        VARCHAR(128),
+    ip          VARCHAR(16),
+    port        INTEGER,
+    relay_count INTEGER,
+    active      BOOLEAN     not null
+);
+
+create table relays
+(
+    id                 INTEGER     not null
+        primary key
+        unique,
+    name               VARCHAR(128),
+    number             INTEGER     not null,
+    controller_id      VARCHAR(33) not null
+        references controllers (id),
+    active_schedule_id VARCHAR(33)
+        references schedules
+);
+
+create table schedules
+(
+    id      VARCHAR(33) not null
+        primary key
+        unique,
+    name    VARCHAR(128),
+    periods BLOB
+);