.NET Core 3.1 Docker - Win32Exception: Exec format error

[Paweł Sydorów]

Hi,
I build and run my application on Docker.
I added this code to startup.cs

     services.AddJsReport(new LocalReporting()
        .UseBinary(JsReportBinary.GetBinary())
        .AsUtility()
        .Create());

And use in controller:

    [MiddlewareFilter(typeof(JsReportPipeline))]
    public async Task<IActionResult> ReportClient(int id)
    {
        var order = await _context.Orders.FirstOrDefaultAsync(m => m.Id == id);
        var orderViewModel = order.MapperToViewModel();
            HttpContext.JsReportFeature().Recipe(Recipe.ChromePdf);

            return View(orderViewModel);
    }

When I try to open my page in PDF I threw the error:

Win32Exception: Exec format error
System.Diagnostics.Process.ForkAndExecProcess(string filename, string[] argv, string[] envp, string cwd, bool redirectStdin, bool redirectStdout, bool redirectStderr, bool setCredentials, uint userId, uint groupId, uint[] groups, out int stdinFd, out int stdoutFd, out int stderrFd, bool usesTerminal, bool throwOnNoExec)
System.Diagnostics.Process.StartCore(ProcessStartInfo startInfo)
System.Diagnostics.Process.Start()
jsreport.Local.Internal.BinaryProcess.InnerExecute(string cmd, bool waitForExit)
jsreport.Local.Internal.BinaryProcess.ExecuteExe(string cmd, bool waitForExit)
jsreport.Local.Internal.LocalUtilityReportingService.RenderAsync(string requestString, CancellationToken ct)
jsreport.AspNetCore.JsReportMiddleware.Invoke(HttpContext context)
Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeNextResourceFilter>g__Awaited|24_0(ResourceInvoker invoker, Task lastTask, State next, Scope scope, object state, bool isCompleted)
Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.Rethrow(ResourceExecutedContextSealed context)
Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.Next(ref State next, ref Scope scope, ref object state, ref bool isCompleted)
Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeFilterPipelineAsync>g__Awaited|19_0(ResourceInvoker invoker, Task lastTask, State next, Scope scope, object state, bool isCompleted)
Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeAsync>g__Awaited|17_0(ResourceInvoker invoker, Task task, IDisposable scope)
Microsoft.AspNetCore.Routing.EndpointMiddleware.<Invoke>g__AwaitRequestTask|6_0(Endpoint endpoint, Task requestTask, ILogger logger)
Microsoft.AspNetCore.Authorization.AuthorizationMiddleware.Invoke(HttpContext context)
Microsoft.AspNetCore.Authentication.AuthenticationMiddleware.Invoke(HttpContext context)
Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware.Invoke(HttpContext context)

Can you help me?

Best regards
Pawel

[jan_blaha]

Hi,

do you use the right binary? Please check the following
https://jsreport.net/learn/dotnet-local#windows-linux-mac
And also the next chapter mentioning docker.

[Paweł Sydorów]

Hi Jan,

Thanks for quick response.
I added some lines in my dockerfile. It is the same result.
Please look:

#See https://aka.ms/containerfastmode to understand how Visual Studio uses this Dockerfile to build your images for faster debugging.

FROM mcr.microsoft.com/dotnet/core/aspnet:3.1-buster-slim AS base
WORKDIR /app
EXPOSE 80
EXPOSE 443

FROM mcr.microsoft.com/dotnet/core/aspnet:3.1-buster-slim AS base
RUN apt-get update && \
apt-get install -y gnupg libgconf-2-4 wget &&
wget -q -O - https://dl-ssl.google.com/linux/linux_signing_key.pub | apt-key add - &&
sh -c 'echo "deb [arch=amd64] http://dl.google.com/linux/chrome/deb/ stable main" >> /etc/apt/sources.list.d/google.list' &&
apt-get update &&
apt-get install -y google-chrome-unstable --no-install-recommends

ENV chrome:launchOptions:args --no-sandbox

FROM mcr.microsoft.com/dotnet/core/sdk:3.1-buster AS build
WORKDIR /src
COPY ["AppMcKapka/AppMcKapka.csproj", "AppMcKapka/"]
RUN dotnet restore "AppMcKapka/AppMcKapka.csproj"
COPY . .
WORKDIR "/src/AppMcKapka"
RUN dotnet build "AppMcKapka.csproj" -c Release -o /app/build

FROM build AS publish
RUN dotnet publish "AppMcKapka.csproj" -c Release -o /app/publish

FROM base AS final
WORKDIR /app
COPY --from=publish /app/publish .
ENTRYPOINT ["dotnet", "AppMcKapka.dll"]

[jan_blaha]

The 3.1-buster-slim looks like debian linux/image.
Do you use jsreport linux binary?
https://jsreport.net/learn/dotnet-local#windows-linux-mac

[Paweł Sydorów]

Now I installed new package:
jsreport.AspNetCore(2.0.2)
jsreport.Binary.Linux(2.7.1)
jsreport.Local(2.2.2)

I change my Startup.cs

    services.AddJsReport(new LocalReporting()
         .UseBinary(jsreport.Binary.Linux.JsReportBinary.GetBinary())
         .AsUtility()
         .Create());

Docker file is the same as above.
My error now.

An unhandled exception occurred while processing the request.
JsReportBinaryException: Error rendering report: instance has been daemonized and initialized successfully (pid: 85)rendering has finished with errors:A critical error occurred while trying to execute the render command (2). Failed to launch chrome!/tmp/jsreport/compile/jsreport-2.7.1-Hy6PlIREU/chrome/chrome: error while loading shared libraries: libX11.so.6: cannot open shared object file: No such file or directoryTROUBLESHOOTING: https://github.com/GoogleChrome/puppeteer/blob/master/docs/troubleshooting.md (1). caused by error (2):-> stackError: at onCriticalError (/snapshot/jsreport/node_modules/jsreport-cli/lib/commands/render.js:302:19) at /snapshot/jsreport/node_modules/jsreport-cli/lib/commands/render.js:256:14 at processTicksAndRejections (internal/process/task_queues.js:93:5)caused by error (1):-> stackError: Failed to launch chrome!/tmp/jsreport/compile/jsreport-2.7.1-Hy6PlIREU/chrome/chrome: error while loading shared libraries: libX11.so.6: cannot open shared object file: No such file or directoryTROUBLESHOOTING: https://github.com/GoogleChrome/puppeteer/blob/master/docs/troubleshooting.md at Client.render (/snapshot/jsreport/node_modules/jsreport-client/lib/client.js) at processTicksAndRejections (internal/process/task_queues.js:93:5) at async startRender (/snapshot/jsreport/node_modules/jsreport-cli/lib/commands/render.js:319:24) at async /snapshot/jsreport/node_modules/jsreport-cli/lib/commands/render.js:226:22 at async Commander.executeCommand (/snapshot/jsreport/node_modules/jsreport-cli/lib/commander.js:242:22)Remote stack: Error: Failed to launch chrome!/tmp/jsreport/compile/jsreport-2.7.1-Hy6PlIREU/chrome/chrome: error while loading shared libraries: libX11.so.6: cannot open shared object file: No such file or directoryTROUBLESHOOTING: https://github.com/GoogleChrome/puppeteer/blob/master/docs/troubleshooting.md at onClose (/snapshot/jsreport/node_modules/puppeteer/lib/Launcher.js:348:14) at Interface.<anonymous> (/snapshot/jsreport/node_modules/puppeteer/lib/Launcher.js:337:50) at Interface.emit (events.js:215:7) at Interface.close (readline.js:403:8) at Socket.onend (readline.js:180:10) at Socket.emit (events.js:215:7) at endReadableNT (_stream_readable.js:1184:12) at processTicksAndRejections (internal/process/task_queues.js:80:21)
jsreport.Local.Internal.LocalUtilityReportingService.RenderAsync(string requestString, CancellationToken ct)

[jan_blaha]

This signals the chrome missing dependency that should get installed with that:

RUN apt-get update && \   
    apt-get install -y gnupg  libgconf-2-4 wget && \
    wget -q -O - https://dl-ssl.google.com/linux/linux_signing_key.pub | apt-key add - && \
    sh -c 'echo "deb [arch=amd64] http://dl.google.com/linux/chrome/deb/ stable main" >> /etc/apt/sources.list.d/google.list' && \
    apt-get update && \
    apt-get install -y google-chrome-unstable --no-install-recommends

ENV chrome:launchOptions:args --no-sandbox

It seems you have twice FROM mcr.microsoft.com/dotnet/core/aspnet:3.1-buster-slim AS base in your dockerfile.
It should be there just once. Maybe the apt-get part isn't running actually. Please remove the second FROM declaration and try it again.