Cannot find native library.

[phrohdoh]

No matter where I put the native library libgit2sharp refuses to fine it.
The tiny project can be found here.

using System;
using System.IO;
using System.Linq;
using LibGit2Sharp;

namespace GitSharp
{
    class MainClass
    {
        public static void Main(string[] args)
        {
            if (args.Length < 2)
            {
                Console.WriteLine("Usage:");
                Console.WriteLine("\targ1: output dir\n\targ2: repo http url");
                return;
            }

            var outputDir = Path.Combine(Environment.CurrentDirectory, args[0]);

            if (!Directory.Exists(outputDir))
                Directory.CreateDirectory(outputDir);

            Console.WriteLine("Output: {0}", outputDir);

            var repoSource = args[1];
            Console.WriteLine("Repo: {0}", repoSource);

            var native = File.Exists("git2-90befde.dll");
            Console.WriteLine("Native exist: {0}", native);

            var path = Repository.Clone(repoSource, outputDir);

            using (var repo = new Repository(path))
            {
                Console.WriteLine("Branches {0}.", repo.Branches.Count());
            }
        }
    }
}

$ mono --debug GitSharp.exe out https://github.com/Phrohdoh/libdrs
crashes with

Unhandled Exception:
System.TypeInitializationException: An exception was thrown by the type initializer for LibGit2Sharp.Core.NativeMethods ---> System.DllNotFoundException: git2-90befde
  at (wrapper managed-to-native) LibGit2Sharp.Core.NativeMethods:git_threads_init ()
  at LibGit2Sharp.Core.NativeMethods+LibraryLifetimeObject..ctor () [0x00000] in <filename unknown>:0 
  at LibGit2Sharp.Core.NativeMethods..cctor () [0x00000] in <filename unknown>:0 
  --- End of inner exception stack trace ---
  at LibGit2Sharp.Core.Proxy.git_clone (System.String url, System.String workdir, LibGit2Sharp.Core.GitCloneOptions& opts) [0x00000] in <filename unknown>:0 
  at LibGit2Sharp.Repository.Clone (System.String sourceUrl, System.String workdirPath, LibGit2Sharp.CloneOptions options) [0x00000] in <filename unknown>:0 
  at GitSharp.MainClass.Main (System.String[] args) [0x00067] in /Users/thill/Projects/GitSharpTest/GitSharp/GitSharp/Program.cs:31 
[ERROR] FATAL UNHANDLED EXCEPTION: System.TypeInitializationException: An exception was thrown by the type initializer for LibGit2Sharp.Core.NativeMethods ---> System.DllNotFoundException: git2-90befde
  at (wrapper managed-to-native) LibGit2Sharp.Core.NativeMethods:git_threads_init ()
  at LibGit2Sharp.Core.NativeMethods+LibraryLifetimeObject..ctor () [0x00000] in <filename unknown>:0 
  at LibGit2Sharp.Core.NativeMethods..cctor () [0x00000] in <filename unknown>:0 
  --- End of inner exception stack trace ---
  at LibGit2Sharp.Core.Proxy.git_clone (System.String url, System.String workdir, LibGit2Sharp.Core.GitCloneOptions& opts) [0x00000] in <filename unknown>:0 
  at LibGit2Sharp.Repository.Clone (System.String sourceUrl, System.String workdirPath, LibGit2Sharp.CloneOptions options) [0x00000] in <filename unknown>:0 
  at GitSharp.MainClass.Main (System.String[] args) [0x00067] in /Users/thill/Projects/GitSharpTest/GitSharp/GitSharp/Program.cs:31

iMac:Debug thill$ ls
./                ../               GitSharp.exe*     GitSharp.exe.mdb  LibGit2Sharp.dll  git2-90befde.dll  out/

I've included binaries in that repo in hopes of resolving this easier.
Sorry if this is too long / unhelpful issue.

[nulltoken]

The binaries included in the NuGet package are Windows only ones.

In order to make this work on Linux/MacOSX, you'll have to build libgit2 by yourself and include the path to the compiled binary in [DY]LD_LIBRARY_PATH.

See the build.libgit2sharp.sh script that's being used by Travis to build and run tests on Linux/MacOSX for more gory details.

[DavidKarlas]

Maybe this will be helpful... https://github.com/mono/libgit-binary which is used here: https://github.com/mono/monodevelop/tree/libgit2ftw to make quick test

[phrohdoh]

I was able to build libgit2 then when attempting to build libgit2sharp I am given:
http://pastebin.com/AjVYdi8n.

Is there a directory I need to create before compilation?

@DavidKarlas, thanks I'll look into that!
My only problem is needing this to run the same across OS X/Linux/Windows, but that may be a good temporary fix.

Edit:

So I found out that the invalid path expands (via some csproj magic) to:
"$(MSBuildProjectDirectory)\..\Lib\NativeBinaries\**\*.*"
which is in fact a real/existing directory.
Because of this I have no idea what is preventing the dylib/so from being built successfully.

[nulltoken]

Is there a directory I need to create before compilation?

@phrohdoh Every required directory should be automatically created.

"$(MSBuildProjectDirectory)\..\Lib\NativeBinaries\**\*.*" is the directory that contains the Win32 builds. The build recipe expects it to exists and will copy the dependencies although they're not required on Linux/Mac.

The error seems to occur while copying those native dependencies (/Users/thill/Projects/libgit2sharp/LibGit2Sharp/CopyNativeDependencies.targets: error : Error executing task CreateItem: Invalid path).

• Could you please tweak the call to xbuild to make it run in verbose mode?
• What's the output when performing a fresh clone, then launching build.libgit2sharp.sh ?

[phrohdoh]

Sorry for the late response, and thank you for the help so far.

A fresh clone would not have libgit2 to work with. This is a fresh libgit2sharp with a built libgit2.
I set /verbosity:diagnostic hoping to get the most amount of debug info:
http://pastebin.com/1rhM0JKG.

[nulltoken]

A fresh clone would not have libgit2 to work with. This is a fresh libgit2sharp with a built libgit2.

Actually the full request was "What's the output when performing a fresh clone, then launching build.libgit2sharp.sh?". The last step takes care of building libgit2.

Could you perform the whole task (fresh clone + launch the shell script) and share with us the result?

[phrohdoh]

Oh, right, sorry about that misunderstanding!
Here is the result of that: http://pastebin.com/X5bYz3nJ

[nulltoken]

Here is the result of that: http://pastebin.com/X5bYz3nJ

Thanks for that. In the log we can see "/Library/Frameworks/Mono.framework/Versions/3.4.0/lib/mono/4.5/Microsoft.Common.targets"

@Therzok pointed this out in #733.

Two options :

• Either downgrade or upgrade. It passes against both Mono 2.10 and 3.6.
• Help use and it work under 3.4. If you feel like diving into MSBuild and can find a way to make CopyNativeDependencies under Mono 3.4, we'd very interested. 😉

[phrohdoh]

TL;DR this output, git2-091165c.dll cannot be found (but it does exist).
This is from a fresh clone and a ./build.libgit2sharp.sh after upgrading to Mono 3.6.1
on OS X 10.9.3, not sure why it is still requesting these win32 dlls.

[Just1n]

I'm meeting the same prob System.DllNotFoundException : git2-091165c when run build.libgit2sharp.sh in Ubuntu.

[Therzok]

@phrohdoh it's not looking for the .dll, but the actual compiled library through the shell script.

[phrohdoh]

Still no resolution after fresh cloning and updating libgit2sharp + mono.
Closing.

[nulltoken]

@Therzok Does it make any sense to you that @phrohdoh wasn't able to make it work? Have we missed something obvious?

[nulltoken]

/cc @carlosmn

[Therzok]

The DYLD_LIBRARY_PATH isn't set for finding the native binaries. That means it will never resolve them. It doesn't matter if they're in the same directory or in a different directory. DYLD_LIBRARY_PATH must specify the location of the native libraries.

Also, it's not requesting the .dlls. It's requesting libraries which it can map.

[phrohdoh]

Building libgit2sharp does not result in anything other than new .dlls; there is nothing to map.
Also setting DYLD_LIBRARY_PATH for my system will not help on the client end.

Is there an obvious step I am overthinking?

[Therzok]

Building libgit2sharp does result in files /libgit2/build.

[phrohdoh]

Wow, thank you so much! I don't know how I never saw those dylibs.

It is partially working now, though I am getting some conflicting reports; in general libgit2sharp is working now.

Sorry for the trouble and again thank you for the help!

[Therzok]

It's not your fault. It's all hidden in the testing script for LibGit2Sharp. We need to make the Unix experience slightly more delightful.

[nulltoken]

Agreed. Logged in #837