Unable to load DLL 'git2': The specified module could not be found

[ChuckSavage]

This is a cross post from http://stackoverflow.com/questions/6313203/unable-to-load-dll-git2-dll-the-specified-module-could-not-be-found/6315033#6315033

I'm using VS2008 and had to create a new solution since the solution and csharp files are .Net 4.0. As far as I could tell its just default parameters that I had to create overloaded methods to handle them to convert to 3.5.

I've copied the git2.dll into every bin folder and have linked it and set copy if newer, but still get the "Unable to load DLL 'git2'" error for

Repository.cs
Line 27: var res = NativeMethods.git_repository_open(out handle, PosixPathHelper.ToPosix(path));

I'm trying to use the library in a ASP.NET website via a custom-controls library.

[nulltoken]

Hey Chuck,

It's really strange. LibGit2Sharp has already successfully been hosted in a web app.
Before diving in the IIS hosting nightmare, can we strike out some quick points?

• Did you downgrade the tests toward VS2008 as well? Have you successfully run them (either through Testdriven.net or the NUnit console)?
• Have you given a try to the VS2010 Express edition?

Some additional info:

• Which commit hash did you build against ?
• What is your development environment (OS, 32/64bits, IIS/Casini/IISExpress/Other, ...)

If you can quickly provide me with a link pointing at a .zip archive of your VS2008 solution, I might take a look at it.

[ChuckSavage]

What is a commit hash? And no I didn't try the tests, I have zero
experience with test code. So wouldn't know what I was looking at. I
attached the zip to this reply, but that may not work. You can get it at
http://media.searisen.com/temp/libgit2-libgit2sharp-v0.2.0-7.zip

That's a good idea on the VS2010 express, I may try that later after some
chores.

ps My environment is Windows-32 vista but will be used on a IIS.

Chuck Savage
http://SeaRisen.com

[nulltoken]

I think I found the root cause of your problem.

You should move the libgit2.dll file one folder upward (eg. suppress the Lib level).

Once the solution is compiled, the two files libgit2.dll and LibGit2Sharp.dll will sit together, next to one another, under the (Lib[Debug|Release]) folder.

Current non working configuration

Fixed configuration

[ChuckSavage]

I moved the git2.dll up to the main project root, it doesn't help. I don't have a libgit2.dll.

I cleaned the project and then rebuilt - still didn't help.

[nulltoken]

I don't have a libgit2.dll.

Sorry. typo. Was meaning git2.dll.

I moved the git2.dll up to the main project root, it doesn't help

Could you please provide a more detailed description?

Is the git2.dll set to be copied to the Output dir?

When the solution is compiled, what are the files generated in the Output dir?

git2.dll and Libgit2Sharp.dll should sit next to one another in order for the binding to work.

[ChuckSavage]

There may be an issue. Using DependencyWalker from DependencyWalker.com, there is a missing DLL that git2.dll is reliant upon, MSVCR100 which apparently is a VS2010 dll. I don't suppose you can remake the git2.dll with VS2008 and send it to me (chuck _at SeaRisen.com). The libgit2 folder in the source is empty or I'd try it myself.

[ChuckSavage]

reply to your comment which I didn't see (had to reload page as I just checked email).

I clean/rebuild the project, the git2.dll is copied and sits next to the LibGit2Sharp.dll and the LibGit2Sharp..pdb. Cleaning and rebuilding the web project, git2.dll is copied in next to the two LibGit2Sharp(.dll and .pdb) files.

Here is the whole error page:

Server Error in '/' Application.

Unable to load DLL 'git2': The specified module could not be found. (Exception from HRESULT: 0x8007007E)
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.DllNotFoundException: Unable to load DLL 'git2': The specified module could not be found. (Exception from HRESULT: 0x8007007E)

Source Error:

Line 25: Ensure.ArgumentNotNullOrEmptyString(path, "path");
Line 26:
Line 27: var res = NativeMethods.git_repository_open(out handle, PosixPathHelper.ToPosix(path));
Line 28: Ensure.Success(res);
Line 29:

Source File: L:\Data\SeaRisen\Code\C#\C#Lib\libgit2-libgit2sharp-v0.2.0-7\LibGit2Sharp\Repository.cs Line: 27

Stack Trace:

[DllNotFoundException: Unable to load DLL 'git2': The specified module could not be found. (Exception from HRESULT: 0x8007007E)]
LibGit2Sharp.Core.NativeMethods.git_repository_open(RepositorySafeHandle& repository, String path) +0
LibGit2Sharp.Repository..ctor(String path) in L:\Data\SeaRisen\Code\C#\C#Lib\libgit2-libgit2sharp-v0.2.0-7\LibGit2Sharp\Repository.cs:27
CommunityLib.db.git.Wiki..ctor(String page) in L:\Data\SeaRisen\Code\C#\CommunityLib\db\git\Wiki.cs:18
CommunityLib.WikiControl.Page_Load(Object sender, EventArgs e) in L:\Data\SeaRisen\Code\C#\CommunityLib\WikiControl.ascx.cs:18
System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) +14
System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +35
System.Web.UI.Control.OnLoad(EventArgs e) +99
System.Web.UI.Control.LoadRecursive() +50
System.Web.UI.Control.LoadRecursive() +141
System.Web.UI.Control.LoadRecursive() +141
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +627

[nulltoken]

Hey Chuck,

Hmmm. I'm thinking you're onto something. Can you google for a version of this MSVCR100.dll and make it copied to the Output dir as well?

If this solves the issue, I will have to come with a more proper fix.

[txdv]

I had the same issue with the missing MSVCR100.DLL.
Took me a long time to determine the cause of the bug, but I downloaded some tool which showed me the dependencies of git.dll and MSVCR100 was one of it.
I have put it even in the readme once.

LibGit2Sharp has already successfully been hosted in a web app.

What web app?

[ChuckSavage]

I got a copy of the MSVCR100.DLL and put it in the debug folder and in the web-project bin folder, that got rid of the dependency warning but not the error of loading the git dll file.

[nulltoken]

So Dependency Walker is happy but LibGi2Sharp refuses to load?

I'm going to prep up a small console project under VS2008 and send it to
you.

[ChuckSavage]

Ok, thanks - and I just tried a new winforms app, put in the program.cs

Repository repo = new Repository("l:\testLibGit2Sharp");

and I get the same error.

[txdv]

nulltoken, are you ignoring me?
Could you please tell me what web app is hosting libgit2sharp?

[ChuckSavage]

Ok, fixed for issue 42 (test cases) and works in winforms and console apps, but I still can't get the web-app to find git2.dll.