PosixPostWriteHandler.cs

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using Mono.Unix;
using Mono.Unix.Native;
using System;

namespace Tgstation.Server.Host.IO
{
    sealed class PosixPostWriteHandler : IPostWriteHandler
    {
        public void HandleWrite(string filePath)
        {
            if (filePath == null)
                throw new ArgumentNullException(nameof(filePath));

            //set executable bit every time, don't want people calling me when their uploaded "sl" binary doesn't work
            if (Syscall.stat(filePath, out var stat) != 0)
                throw new UnixIOException(Stdlib.GetLastError());

            if (stat.st_mode.HasFlag(FilePermissions.S_IXUSR))
                return;

            if (Syscall.chmod(filePath, stat.st_mode | FilePermissions.S_IXUSR) != 0)
                throw new UnixIOException(Stdlib.GetLastError());
        }
    }
}