Fix password setting using chpasswd -R and improve screen wake lock

iridium_installer/backend/os_install.py

@@ -239,21 +239,6 @@ UUID={efi_uuid} /boot vfat defaults 0 2
             # Ensure changes to /etc/passwd and /etc/shadow are flushed
             run_command(["sync"])
             
-            # Set password using passwd --stdin
-            try:
-                logger.info("Setting user password...")
-                p = subprocess.run(
-                    ["chroot", mount_root, "passwd", "--stdin", user_info["username"]],
-                    input=f"{user_info['password']}\n",
-                    text=True,
-                    check=True,
-                    stdout=subprocess.PIPE,
-                    stderr=subprocess.PIPE
-                )
-            except subprocess.CalledProcessError as e:
-                logger.error(f"Failed to set password: {e.stderr}")
-                raise e
-            
             # Ensure wheel group has sudo privileges
             sudoers_dir = os.path.join(mount_root, "etc/sudoers.d")
             os.makedirs(sudoers_dir, exist_ok=True)
@@ -261,6 +246,21 @@ UUID={efi_uuid} /boot vfat defaults 0 2
                 f.write("%wheel ALL=(ALL) ALL\n")
             os.chmod(os.path.join(sudoers_dir, "wheel"), 0o440)
 
+            # Set user and root password using chpasswd -R (from host side)
+            try:
+                logger.info(f"Setting passwords for {user_info['username']} and root...")
+                # We set both to the same password for convenience in this minimal install
+                pass_data = f"{user_info['username']}:{user_info['password']}\nroot:{user_info['password']}\n"
+                subprocess.run(
+                    ["chpasswd", "-R", mount_root],
+                    input=pass_data,
+                    text=True,
+                    check=True
+                )
+            except subprocess.CalledProcessError as e:
+                logger.error("Failed to set passwords using chpasswd -R")
+                raise e
+
             # Set hostname
             with open(os.path.join(mount_root, "etc/hostname"), "w") as f:
                 f.write(user_info["hostname"] + "\n")