Visual Studio Code/OmniSharp on Ubuntu 18.04: DllNotFoundException

Visual Studio Code/OmniSharp fails to properly load .csproj projects which contain a reference to NerdBank.GitVersioning. I’ve tried with the latest version of the 3.0 series of nbgv, both from NuGet and the CI feed.

Don’t have much time to deep dive into this at the moment. Here are a couple of things I’ve noticed:

• Compiling using dotnet build works properly.
• I’m a bit confused by the lib/ part in the path (lib/linux-x64/libgit2-572e4d8.so)
• linux-x64/libgit2-572e4d8.so should load fine on my platform, see the ldd output below.

Here’s the full stack error:

[fail]: OmniSharp.MSBuild.ProjectLoader
        The "Nerdbank.GitVersioning.Tasks.GetBuildVersion" task failed unexpectedly.
System.TypeInitializationException: The type initializer for 'LibGit2Sharp.Core.NativeMethods' threw an exception. ---> System.DllNotFoundException: lib/linux-x64/libgit2-572e4d8.so assembly:<unknown assembly> type:<unknown type> member:(null)
  at (wrapper managed-to-native) LibGit2Sharp.Core.NativeMethods.git_libgit2_init()
  at LibGit2Sharp.Core.NativeMethods.InitializeNativeLibrary () [0x00002] in <5eedf8e7a87843a29f618ebab30cacf5>:0 
  at LibGit2Sharp.Core.NativeMethods..cctor () [0x00045] in <5eedf8e7a87843a29f618ebab30cacf5>:0 
   --- End of inner exception stack trace ---
  at LibGit2Sharp.Core.Proxy.git_libgit2_opts_set_search_path (LibGit2Sharp.ConfigurationLevel level, System.String path) [0x00000] in <5eedf8e7a87843a29f618ebab30cacf5>:0 
  at LibGit2Sharp.GlobalSettings.SetConfigSearchPaths (LibGit2Sharp.ConfigurationLevel level, System.String[] paths) [0x0001a] in <5eedf8e7a87843a29f618ebab30cacf5>:0 
  at Nerdbank.GitVersioning.GitExtensions.OpenGitRepo (System.String pathUnderGitRepo, System.Boolean useDefaultConfigSearchPaths) [0x00025] in <e6b3f9410fa9409c8eeff285038f1773>:0 
  at Nerdbank.GitVersioning.VersionOracle.Create (System.String projectDirectory, System.String gitRepoDirectory, Nerdbank.GitVersioning.ICloudBuild cloudBuild, System.Nullable`1[T] overrideBuildNumberOffset, System.String projectPathRelativeToGitRepoRoot) [0x00017] in <e6b3f9410fa9409c8eeff285038f1773>:0 
  at Nerdbank.GitVersioning.Tasks.GetBuildVersion.ExecuteInner () [0x000c5] in <0c993f0ed37445e28de1993f9f821a67>:0 
  at MSBuildExtensionTask.ContextAwareTask.Execute () [0x0005e] in <0c993f0ed37445e28de1993f9f821a67>:0 
  at Microsoft.Build.BackEnd.TaskExecutionHost.Microsoft.Build.BackEnd.ITaskExecutionHost.Execute () [0x00029] in <b695b16788dd418cbe8b4d98f7a92ff3>:0 
  at Microsoft.Build.BackEnd.TaskBuilder.ExecuteInstantiatedTask (Microsoft.Build.BackEnd.ITaskExecutionHost taskExecutionHost, Microsoft.Build.BackEnd.Logging.TaskLoggingContext taskLoggingContext, Microsoft.Build.BackEnd.TaskHost taskHost, Microsoft.Build.BackEnd.ItemBucket bucket, Microsoft.Build.BackEnd.TaskExecutionMode howToExecuteTask) [0x002a9] in <b695b16788dd418cbe8b4d98f7a92ff3>:0 

Here’s the ldd output:

$ ldd ~/.nuget/packages/nerdbank.gitversioning/3.0.41/build/runtimes/linux-x64/native/libgit2-572e4d8.so 
	linux-vdso.so.1 (0x00007fffb69b1000)
	librt.so.1 => /lib/x86_64-linux-gnu/librt.so.1 (0x00007f7ee672a000)
	libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007f7ee650b000)
	libssl.so.1.0.0 => /usr/lib/x86_64-linux-gnu/libssl.so.1.0.0 (0x00007f7ee62a3000)
	libcrypto.so.1.0.0 => /usr/lib/x86_64-linux-gnu/libcrypto.so.1.0.0 (0x00007f7ee5e60000)
	libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f7ee5a6f000)
	/lib64/ld-linux-x86-64.so.2 (0x00007f7ee6c5d000)
	libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007f7ee586b000)

Leaving this here in case anyone else sees a similar problem (or even better, knows how to fix it).

[bradwilson]

Or maybe should we be poking Omnisharp to move to .NET Core instead of Mono?

[bradwilson]

Yep, this basically breaks using VS Code for C# projects that use GitVersioning, because the project load failure means no Intellisense, no F12, etc.