Starting work on backup system

modoboa_installer/scripts/__init__.py

@@ -6,11 +6,16 @@ import sys
 from .. import utils
 
 
-def install(appname, config, upgrade):
+def install(appname, config, upgrade, backup):
     """Install an application."""
     if (config.has_option(appname, "enabled") and
             not config.getboolean(appname, "enabled")):
         return
+    if backup:
+        utils.printcolor("Starting up backup...", utils.MAGENTA)
+        script = importlib.import_module("modoboa_installer.backup")
+        getattr(script, Backup())(config).run()
+        return
     utils.printcolor("Installing {}".format(appname), utils.MAGENTA)
     try:
         script = importlib.import_module(

modoboa_installer/scripts/backup.py

@@ -0,0 +1,114 @@
+"""Backup script for pre-installed instance"""
+
+import shutil
+import utils
+import os
+
+#TODO: have version of each modoboa componenent saved into the config file to restore the same version  
+
+class Backup():
+
+
+    def __init__(self, config):
+        self.config = config
+        self.destinationPath = ""
+        self.BACKUPDIRECTORY = ["mails", "custom", "databases"]
+
+
+    def preparePath(self):
+        for dir in self.BACKUPDIRECTORY:
+            os.mkdir(self.destinationPath + dir)
+
+
+    def validatePath(self, path):
+        """Check basic condition for backup directory"""
+
+        if os.path.isfile(path):
+            print("Error, you provided a file instead of a directory!")
+            return False
+
+        if not os.path.exists(path):
+            createDir = input(f"\"{path}\" doesn't exists, would you like to create it ? [Y/n]\n").lower()
+
+            if createDir == "y" or createDir == "yes":
+                os.mkdir(path)
+            else:
+                return False
+
+        if len(os.listdir(path)) != 0:
+            delDir = input("Warning : backup folder is not empty, it will be purged if you continue... [Y/n]").lower()
+            if delDir == "y" or delDir == "yes":
+                shutil.rmtree(path)
+            else:
+                return False
+
+        self.destinationPath = path
+
+        if self.destinationPath[-1] != "/":
+            self.destinationPath += "/"
+
+        self.preparePath()
+        return True
+
+
+    def setPath(self):
+        """Setup backup directory"""
+        user_value = None
+        while (user_value != '' and not self.validatePath(user_value)):
+            print("Enter backup path, please provide an empty folder.")
+            user_value = utils.user_input("-> ")
+    
+
+    def backupConfigFile(self):
+        utils.copy_file("installer.cfg", self.destinationPath)
+
+
+    def backupMails(self):
+
+        utils.printcolor("Backing up mails", utils.MAGENTA)
+
+        home_path = self.config.get("dovecot", "home_dir")
+
+        if not os.path.exists(home_path) or os.path.isfile(home_path):
+            utils.printcolor("Error backing up Email, provided path "
+            f" ({home_path}) seems not right...", utils.RED)
+        
+        else:
+            shutil.copytree(home_path, self.destinationPath+"mails/")
+            utils.printcolor("Mail backup complete!", utils.GREEN)
+
+
+    def backupCustomConfig(self):
+        """Custom config :
+        - Amavis : /etc/amavis/conf.d/99-custom
+        - Postscreen : /etc/postfix/custom_whitelist.cidr
+        Feel free to suggest to add others!"""
+        utils.printcolor("Backing up some custom configuration...", utils.MAGENTA)
+
+        custom_path = self.destinationPath+"custom/"
+
+        """AMAVIS"""
+        amavis_custom = "/etc/amavis/conf.d/99-custom"
+        if os.path.isfile(amavis_custom):
+            utils.copy_file(amavis_custom, custom_path)
+            utils.printcolor("Amavis custom configuration saved!", utils.GREEN)
+
+        """POSTSCREEN"""
+        postscreen_custom = "/etc/postfix/custom_whitelist.cidr"
+        if os.path.isfile(postscreen_custom):
+            utils.copy_file(postscreen_custom, custom_path)
+            utils.printcolor("Postscreen whitelist custom configuration saved!", utils.GREEN)
+
+
+    def backupDBs(self):
+        """Backing up databases"""
+
+
+    def run(self):
+        self.setPath()
+        self.backupConfigFile()
+        self.backupMails()
+        self.backupCustomConfig()
+        self.backupDBs()
+
+        

modoboa_installer/utils.py

@@ -163,19 +163,26 @@ def copy_from_template(template, dest, context):
         fp.write(ConfigFileTemplate(buf).substitute(context))
 
 
-def check_config_file(dest, interactive=False, upgrade=False):
+def check_config_file(dest, interactive=False, upgrade=False, backup=False):
     """Create a new installer config file if needed."""
+    isPresent = True
     if os.path.exists(dest):
-        return
+        return isPresent
     if upgrade:
         printcolor(
             "You cannot upgrade an existing installation without a "
             "configuration file.", RED)
         sys.exit(1)
+    elif backup:
+        isPresent = False
+        printcolor(
+            "Your configuration file hasn't been found. A new one will be generated. "
+            "Please edit it with correct password for the databases !", RED)
     printcolor(
         "Configuration file {} not found, creating new one."
         .format(dest), YELLOW)
     gen_config(dest, interactive)
+    return isPresent
 
 
 def has_colours(stream):

run.py

@@ -44,6 +44,13 @@ def upgrade_disclaimer(config):
         " will be impacted:", utils.BLUE
     )
 
+def backup_disclamer():
+    """Display backup disclamer. """
+    utils.printcolor(
+        "Your mail server will be backed up (messages and databases) locally."
+        " !! You should really transfer the backup somewhere else..."
+        " Custom configuration (like to postfix) won't be saved.", utils.BLUE)
+
 
 def main(input_args):
     """Install process."""
@@ -51,6 +58,8 @@ def main(input_args):
     versions = (
         ["latest"] + list(compatibility_matrix.COMPATIBILITY_MATRIX.keys())
     )
+    parser.add_argument("--backup", action="store_true", default=False,
+                        help="Backing up previously installed instance")
     parser.add_argument("--debug", action="store_true", default=False,
                         help="Enable debug output")
     parser.add_argument("--force", action="store_true", default=False,
@@ -79,8 +88,8 @@ def main(input_args):
     if args.debug:
         utils.ENV["debug"] = True
     utils.printcolor("Welcome to Modoboa installer!\n", utils.GREEN)
-    utils.check_config_file(args.configfile, args.interactive, args.upgrade)
-    if args.stop_after_configfile_check:
+    wasConfigFileAlreadyThere = utils.check_config_file(args.configfile, args.interactive, args.upgrade, args.backup)
+    if args.stop_after_configfile_check or (not wasConfigFileAlreadyThere and args.backup):
         return
     config = configparser.ConfigParser()
     with open(args.configfile) as fp:
@@ -92,10 +101,13 @@ def main(input_args):
     config.set("modoboa", "version", args.version)
     config.set("modoboa", "install_beta", str(args.beta))
     # Display disclaimer python 3 linux distribution
-    if not args.upgrade:
-        installation_disclaimer(args, config)
-    else:
+    if args.upgrade:
         upgrade_disclaimer(config)
+    elif args.backup:
+        backup_disclamer()
+    else:
+        installation_disclaimer(args, config)
+        
     # Show concerned components
     components = []
     for section in config.sections():