Add function to add user to dialout/uucp

REVHubInterface/__main__.py

@@ -16,7 +16,11 @@
 #     print(platform.system)
 #     tkinter.messagebox.showerror('Drivers Not Detected', 'Please verify the correct drivers are installed.  Without the correct dirvers, firmware update functionality will be unavailable.\n\n - Windows 10 and above should automatically install the correct drivers when the Expansion Hub is plugged in.\n\n - Windows 7 requires a manual install. Please see this link for the correct driver (FTDI D2xx): https://www.ftdichip.com/Drivers/CDM/CDM21228_Setup.zip\n\n - On macOS, install libftdi via Homebrew: "brew install libftdi"\n\n - On Linux, install libftdi.  On Debian/Ubuntu-based systems, install it via "sudo apt install libftdi1"\n\nException Message:\n' + str(e))
 if not serialaccess.hasAccess(): 
-    tkinter.messagebox.showerror("User does not have serial access", "Your user does not have access to serial. Switch to a user that does, or add your user to a group that has serial access.\nhttps://github.com/unofficial-rev-port/REVHubInterface/blob/main/README.md#access-to-serial-on-linux")
+    if tkinter.messagebox.askyesno("User does not have serial access", "Your user likely does not have access to serial.  Switch to a user that does, or add your user to a group that has serial access.  For more details, see our documentation:\n\nhttps://github.com/unofficial-rev-port/REVHubInterface/blob/main/README.md#access-to-serial-on-linux\n\nWould you like to configure your user to have serial access?"):
+        try:
+            serialaccess.getAccess()
+        except Exception as e:
+            tkinter.messagebox.showerror(message = "Failed to add the user to the group!  Please report this error to the developers:\n\n" + str(e))
 
 def error(windowName: str, error: Exception) -> None:
     errName = str(error)

REVHubInterface/serialaccess.py

@@ -10,3 +10,28 @@ def hasAccess():
         except KeyError:
             return False
     else: return True
+
+def getAccess():
+    # Get all groups that exist on the system
+    all_groups = grp.getgrall()
+
+    # Check if 'dialout' or 'uucp' is in any of the available group names, and set it as the group to use if so
+    group_to_use = 'unknown'
+    for group in all_groups:
+        if 'dialout' in group.gr_name.lower():
+            group_to_use = 'dialout'
+            break
+        if 'uucp' in group.gr_name.lower():
+            group_to_use = 'uucp'
+            break
+
+    if group_to_use == 'unknown':
+        raise Exception("Neither dialout or uucp seem to exist.")
+
+    if os.path.exists("/usr/bin/flatpak-spawn"):
+        command_result = os.system("/usr/bin/flatpak-spawn --host pkexec usermod $USER -a -G dialout")
+    else:
+        command_result = os.system("pkexec usermod $USER -a -G dialout")
+
+    if command_result != 0:
+        raise Exception("Unexpected command exit code: " + str(command_result))