Added checks on install

.github/workflows/versioning.yml

@@ -1,6 +1,8 @@
 name: Update version file
 
-on: push
+on:
+  push:
+    branches: [ master ]
 
 jobs:
   update-version:

checks.py

@@ -0,0 +1,33 @@
+"""Checks to be performed before any install or upgrade"""
+
+import sys
+from urllib.request import urlopen
+
+from modoboa_installer import utils
+
+
+def check_version():
+    local_version = ""
+    with open("version.txt", "r") as version:
+        local_version = version.readline()
+    remote_version = ""
+    with urlopen("https://raw.githubusercontent.com/modoboa/modoboa-installer/master/version.txt") as r_version:
+        remote_version = r_version.read().decode()
+    if local_version == "" or remote_version == "":
+        utils.printcolor("Could not check that your installer is up to date: "
+              f"local version: {local_version}, "
+              f"remote version: {remote_version}",
+              utils.YELLOW)
+    if remote_version != local_version:
+        utils.error("Your installer seems outdated.\n"
+            "Check the README for instruction on how to update.\n"
+            "No support will be provided without an up to date installer!")
+        answer = utils.user_input("Continue anyway? (Y/n) ")
+        if not answer.lower().startswith("y"):
+            sys.exit(0)
+    else:
+        utils.success("Installer seems up to date!")
+
+
+def handle():
+    check_version()

run.py

@@ -11,6 +11,7 @@ except ImportError:
     import ConfigParser as configparser
 import sys
 
+import checks
 from modoboa_installer import compatibility_matrix
 from modoboa_installer import constants
 from modoboa_installer import package
@@ -168,7 +169,10 @@ def main(input_args):
         "--restore", type=str, metavar="path",
         help="Restore a previously backup up modoboa instance on a NEW machine. "
         "You MUST provide backup directory"
-    )
+    ),
+    parser.add_argument(
+        "--skip-checks"; action="store_true", default=False,
+        help="Skip the checks the installer performs initially")
     parser.add_argument("domain", type=str,
                         help="The main domain of your future mail server")
     args = parser.parse_args(input_args)
@@ -189,6 +193,12 @@ def main(input_args):
 
     utils.success("Welcome to Modoboa installer!\n")
 
+    # Checks
+    if not args.skip_checks:
+        utils.printcolor("Checking the installer...", utils.BLUE)
+        checks.handle()
+        utils.success("Checks complete")
+
     is_config_file_available, outdate_config = utils.check_config_file(
         args.configfile, args.interactive, args.upgrade, args.backup, is_restoring)