Fix crash when running with nohup on Linux due to closed stdin

[Copilot]

When running with nohup or in detached mode on Linux, the application crashes with IOException: Bad file descriptor because stdin is redirected to /dev/null and closed, causing Console.Read() to throw.

Changes

• Command.cs: Wrap Console.Read() in try-catch for IOException when input is redirected
  • Treat IOException as equivalent to -1 (no input available)
  • Continues execution loop with delay instead of propagating exception

// Before
if (Console.IsInputRedirected)
{
    int keyPressed = Console.Read();  // Throws IOException on closed stdin
    ...
}

// After
if (Console.IsInputRedirected)
{
    int keyPressed;
    try
    {
        keyPressed = Console.Read();
    }
    catch (IOException)
    {
        // stdin closed (e.g., nohup, systemd service)
        keyPressed = -1;
    }
    ...
}

This allows the application to run unattended in background/detached scenarios while maintaining normal console input behavior when stdin is available.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• example.com
  • Triggering command: ./OpenDirectoryDownloader --url REDACTED --quit (dns block)
• www.example.com
  • Triggering command: ./OpenDirectoryDownloader --url REDACTED --quit (dns block)
• www.falsedoor.com
  • Triggering command: ./OpenDirectoryDownloader --url REDACTED --quit (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Allow nohup background running</issue_title>
<issue_description>Hello there,

Currently, on Linux, if you try to run ODD in an unattended way, for instance with nohup, it does not work at all, the following message is returned:

Console input is redirect, maybe it is run inside another host. This could mean that no input will be send/processed.
2025-01-10 20:01:43.705 [WRN] Console input is redirect, maybe it is run inside another host. This could mean that no input will be send/processed.
2025-01-10 20:01:43.751 [ERR] Error processing action
System.UnauthorizedAccessException: Access to the path is denied.
 ---> System.IO.IOException: Bad file descriptor
   --- End of inner exception stack trace ---
   at Interop.ThrowExceptionForIoErrno(ErrorInfo, String, Boolean)
   at Interop.CheckIo(Int64, String , Boolean )
   at Interop.CheckIo(Int32, String , Boolean )
   at System.ConsolePal.Read(SafeFileHandle, Span`1)
   at System.ConsolePal.UnixConsoleStream.Read(Span`1)
   at System.IO.ConsoleStream.Read(Byte[], Int32, Int32)
   at System.IO.StreamReader.ReadBuffer()
   at System.IO.StreamReader.Read()
   at System.IO.SyncTextReader.Read()
   at System.Console.Read()
   at OpenDirectoryDownloader.Command.ProcessConsoleInput(OpenDirectoryIndexer openDirectoryIndexer)
Unhandled exception. System.UnauthorizedAccessException: Access to the path is denied.
 ---> System.IO.IOException: Bad file descriptor
   --- End of inner exception stack trace ---
   at Interop.ThrowExceptionForIoErrno(ErrorInfo, String, Boolean)
   at Interop.CheckIo(Int64, String , Boolean )
   at Interop.CheckIo(Int32, String , Boolean )
   at System.ConsolePal.Read(SafeFileHandle, Span`1)
   at System.ConsolePal.UnixConsoleStream.Read(Span`1)
   at System.IO.ConsoleStream.Read(Byte[], Int32, Int32)
   at System.IO.StreamReader.ReadBuffer()
   at System.IO.StreamReader.Read()
   at System.IO.SyncTextReader.Read()
   at System.Console.Read()
   at OpenDirectoryDownloader.Command.ProcessConsoleInput(OpenDirectoryIndexer openDirectoryIndexer)
   at OpenDirectoryDownloader.Program.Main(String[] args)
   at OpenDirectoryDownloader.Program.<Main>(String[] args)

Could you allow such capacity ?

Cheers!</issue_description>

Comments on the Issue (you are @copilot in this section)

@KoalaBear84 Hi,

I have never heard of this. How do you start/use it? What is the purpose?</comment_new>
<comment_new>@KoalaBear84
I've tried reproducing it, but I can't :)

koalabear@DESKTOP-XX:~$ nohup ./OpenDirectoryDownloader --url https://www.falsedoor.com/txt/ &
[1] 27642
koalabear@DESKTOP-XX:~$ nohup: ignoring input and appending output to 'nohup.out'
koalabear@DESKTOP-XX:~$

koalabear@DESKTOP-XXX:~$ cat /etc/os-release
PRETTY_NAME="Ubuntu 22.04.2 LTS"
NAME="Ubuntu"
VERSION_ID="22.04"
VERSION="22.04.2 LTS (Jammy Jellyfish)"
VERSION_CODENAME=jammy
ID=ubuntu
ID_LIKE=debian
HOME_URL="https://www.ubuntu.com/"
SUPPORT_URL="https://help.ubuntu.com/"
BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/"
PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy"
UBUNTU_CODENAME=jammy

What can I try next?</comment_new>

• Fixes Allow nohup background running #147

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