Add explanation about ynh_backup, remove progress bars and move mysqldump to the end

scripts/backup

@@ -24,7 +24,7 @@ ynh_abort_if_errors
 #=================================================
 # LOAD SETTINGS
 #=================================================
-ynh_script_progression --message="Loading installation settings..." --time --weight=1
+ynh_print_info --message="Loading installation settings..."
 
 app=$YNH_APP_INSTANCE_NAME
 
@@ -33,41 +33,37 @@ domain=$(ynh_app_setting_get --app=$app --key=domain)
 db_name=$(ynh_app_setting_get --app=$app --key=db_name)
 
 #=================================================
-# STANDARD BACKUP STEPS
+# DECLARE DATA AND CONF FILES TO BACKUP
 #=================================================
 
+ynh_print_info --message="Declaring files to be backuped..."
+
+# N.B. : the following 'ynh_backup' calls are only a *declaration* of what needs
+# to be backuped and not an actual copy of any file. The actual backup that
+# creates and fill the archive with the files happens in the core after this
+# script is called. Hence ynh_backups calls takes basically 0 seconds to run.
+
 #=================================================
 # BACKUP THE APP MAIN DIR
 #=================================================
-ynh_script_progression --message="Backing up the main app directory..." --time --weight=1
 
 ynh_backup --src_path="$final_path"
 
 #=================================================
 # BACKUP THE NGINX CONFIGURATION
 #=================================================
-ynh_script_progression --message="Backing up nginx web server configuration..." --time --weight=1
 
 ynh_backup --src_path="/etc/nginx/conf.d/$domain.d/$app.conf"
 
 #=================================================
 # BACKUP THE PHP-FPM CONFIGURATION
 #=================================================
-ynh_script_progression --message="Backing up php-fpm configuration..." --time --weight=1
 
 ynh_backup --src_path="/etc/php/7.0/fpm/pool.d/$app.conf"
 
-#=================================================
-# BACKUP THE MYSQL DATABASE
-#=================================================
-ynh_script_progression --message="Backing up the MySQL database..." --time --weight=1
-
-ynh_mysql_dump_db --database="$db_name" > db.sql
-
 #=================================================
 # BACKUP FAIL2BAN CONFIGURATION
 #=================================================
-ynh_script_progression --message="Backing up fail2ban configuration..." --time --weight=1
 
 ynh_backup --src_path="/etc/fail2ban/jail.d/$app.conf"
 ynh_backup --src_path="/etc/fail2ban/filter.d/$app.conf"
@@ -77,14 +73,12 @@ ynh_backup --src_path="/etc/fail2ban/filter.d/$app.conf"
 #=================================================
 # BACKUP LOGROTATE
 #=================================================
-ynh_script_progression --message="Backing up logrotate configuration..." --time --weight=1
 
 ynh_backup --src_path="/etc/logrotate.d/$app"
 
 #=================================================
 # BACKUP SYSTEMD
 #=================================================
-ynh_script_progression --message="Backing up systemd configuration..." --time --weight=1
 
 ynh_backup --src_path="/etc/systemd/system/$app.service"
 
@@ -94,8 +88,19 @@ ynh_backup --src_path="/etc/systemd/system/$app.service"
 
 ynh_backup --src_path="/etc/cron.d/$app"
 
+#=================================================
+# BACKUP THE MYSQL DATABASE
+#=================================================
+
+ynh_print_info --message="Backing up the database..."
+
+# (However, things like mysql dumps *do* take some time to run, though the
+# copy of the generated dump to the archive still happens later)
+
+ynh_mysql_dump_db --database="$db_name" > db.sql
+
 #=================================================
 # END OF SCRIPT
 #=================================================
 
-ynh_script_progression --message="Backup script completed for $app. (YunoHost will then actually copy those files to the archive)." --time --last
+ynh_print_info --message="Backup script completed for $app. (YunoHost will then actually copy those files to the archive)." --time --last