PosixPostWriteHandler.cs

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using Microsoft.Extensions.Logging;
using Mono.Unix;
using Mono.Unix.Native;
using System;

namespace Tgstation.Server.Host.IO
{
    sealed class PosixPostWriteHandler : IPostWriteHandler
    {
        readonly ILogger<PosixPostWriteHandler> logger;

        public PosixPostWriteHandler(ILogger<PosixPostWriteHandler> logger)
        {
            this.logger = logger ?? throw new ArgumentNullException(nameof(logger));
        }

        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))
            {
                logger.LogTrace("{0} already +x", filePath);
                return;
            }

            logger.LogTrace("Setting +x on {0}", filePath);
            if (Syscall.chmod(filePath, stat.st_mode | FilePermissions.S_IXUSR) != 0)
                throw new UnixIOException(Stdlib.GetLastError());
        }
    }
}