Add is_fedora and exit_distro_not_supported functions

Between is_fedora, is_ubuntu and is_suse, we can make the code a bit
simpler to read. We also use exit_distro_not_supported to identify
places where we need implementation details for new distros.

As "/sbin/service --skip-redirect" is Fedora-specific, guard this with a
is_fedora test too.

Change-Id: Ic77c0697ed9be0dbb5df8e73da93463e76025f0c

lib/databases/mysql

@@ -23,22 +23,28 @@ function configure_database_mysql {
     if is_ubuntu; then
         MY_CONF=/etc/mysql/my.cnf
         MYSQL=mysql
-    else
+    elif is_fedora; then
         MY_CONF=/etc/my.cnf
-        if is_suse; then
-            MYSQL=mysql
-        else
-            MYSQL=mysqld
-        fi
+        MYSQL=mysqld
+    elif is_suse; then
+        MY_CONF=/etc/my.cnf
+        MYSQL=mysql
+    else
+        exit_distro_not_supported "mysql configuration"
     fi
 
     # Start mysql-server
-    if [[ "$os_PACKAGE" = "rpm" ]]; then
-        # RPM doesn't start the service
+    if is_fedora || is_suse; then
+        # service is not started by default
         start_service $MYSQL
-        # Set the root password - only works the first time
+    fi
+
+    # Set the root password - only works the first time. For Ubuntu, we already
+    # did that with debconf before installing the package.
+    if ! is_ubuntu; then
         sudo mysqladmin -u root password $DATABASE_PASSWORD || true
     fi
+
     # Update the DB to give user ‘$DATABASE_USER’@’%’ full control of the all databases:
     sudo mysql -uroot -p$DATABASE_PASSWORD -h127.0.0.1 -e "GRANT ALL PRIVILEGES ON *.* TO '$DATABASE_USER'@'%' identified by '$DATABASE_PASSWORD';"
 
@@ -84,10 +90,12 @@ EOF
         chmod 0600 $HOME/.my.cnf
     fi
     # Install mysql-server
-    if is_suse; then
+    if is_ubuntu || is_fedora; then
+        install_package mysql-server
+    elif is_suse; then
         install_package mysql-community-server
     else
-        install_package mysql-server
+        exit_distro_not_supported "mysql installation"
     fi
 }
 

lib/databases/postgresql

@@ -20,7 +20,7 @@ function recreate_database_postgresql {
 
 function configure_database_postgresql {
     echo_summary "Configuring and starting PostgreSQL"
-    if [[ "$os_PACKAGE" = "rpm" ]]; then
+    if is_fedora || is_suse; then
         PG_HBA=/var/lib/pgsql/data/pg_hba.conf
         PG_CONF=/var/lib/pgsql/data/postgresql.conf
         sudo [ -e $PG_HBA ] || sudo postgresql-setup initdb
@@ -53,10 +53,12 @@ EOF
     else
         sed -i "s/:root:\w\+/:root:$DATABASE_PASSWORD/" $PGPASS
     fi
-    if [[ "$os_PACKAGE" = "rpm" ]]; then
+    if is_ubuntu; then
+        install_package postgresql
+    elif is_fedora || is_suse; then
         install_package postgresql-server
     else
-        install_package postgresql
+        exit_distro_not_supported "postgresql installation"
     fi
 }