GitException thrown in ZLibStream (Invalid ZLIB header?)

[WildCard65]

C:\Users\lollo\.nuget\packages\nerdbank.gitversioning\3.4.216\build\Nerdbank.GitVersioning.Inner.targets(17,5): error MSB4018: The "Nerdbank.GitVersioning.Tasks.GetBuildVersion" task failed unexpectedly.
C:\Users\lollo\.nuget\packages\nerdbank.gitversioning\3.4.216\build\Nerdbank.GitVersioning.Inner.targets(17,5): error MSB4018: Nerdbank.GitVersioning.GitException: Exception of type 'Nerdbank.GitVersioning.GitException' was thrown.
C:\Users\lollo\.nuget\packages\nerdbank.gitversioning\3.4.216\build\Nerdbank.GitVersioning.Inner.targets(17,5): error MSB4018:    at Nerdbank.GitVersioning.ManagedGit.ZLibStream..ctor(Stream stream, Int64 length) in NerdBank.GitVersioning.dll:token 0x600022e+0x5b
C:\Users\lollo\.nuget\packages\nerdbank.gitversioning\3.4.216\build\Nerdbank.GitVersioning.Inner.targets(17,5): error MSB4018:    at Nerdbank.GitVersioning.ManagedGit.GitObjectStream..ctor(Stream stream, String objectType) in NerdBank.GitVersioning.dll:token 0x6000176+0x0
C:\Users\lollo\.nuget\packages\nerdbank.gitversioning\3.4.216\build\Nerdbank.GitVersioning.Inner.targets(17,5): error MSB4018:    at Nerdbank.GitVersioning.ManagedGit.GitRepository.TryGetObjectByPath(GitObjectId sha, String objectType, Stream& value) in NerdBank.GitVersioning.dll:token 0x6000201+0x61
C:\Users\lollo\.nuget\packages\nerdbank.gitversioning\3.4.216\build\Nerdbank.GitVersioning.Inner.targets(17,5): error MSB4018:    at Nerdbank.GitVersioning.ManagedGit.GitRepository.TryGetObjectBySha(GitObjectId sha, String objectType, Stream& value) in NerdBank.GitVersioning.dll:token 0x60001fd+0x3b
C:\Users\lollo\.nuget\packages\nerdbank.gitversioning\3.4.216\build\Nerdbank.GitVersioning.Inner.targets(17,5): error MSB4018:    at Nerdbank.GitVersioning.ManagedGit.GitRepository.GetObjectBySha(GitObjectId sha, String objectType) in NerdBank.GitVersioning.dll:token 0x60001fc+0xf
C:\Users\lollo\.nuget\packages\nerdbank.gitversioning\3.4.216\build\Nerdbank.GitVersioning.Inner.targets(17,5): error MSB4018:    at Nerdbank.GitVersioning.ManagedGit.GitRepository.GetCommit(GitObjectId sha, Boolean readAuthor) in NerdBank.GitVersioning.dll:token 0x60001f8+0x0
C:\Users\lollo\.nuget\packages\nerdbank.gitversioning\3.4.216\build\Nerdbank.GitVersioning.Inner.targets(17,5): error MSB4018:    at Nerdbank.GitVersioning.ManagedGit.GitRepository.GetHeadCommit(Boolean readAuthor) in NerdBank.GitVersioning.dll:token 0x60001f7+0x1e
C:\Users\lollo\.nuget\packages\nerdbank.gitversioning\3.4.216\build\Nerdbank.GitVersioning.Inner.targets(17,5): error MSB4018:    at Nerdbank.GitVersioning.Managed.ManagedGitContext..ctor(String workingDirectory, String dotGitPath, String committish) in NerdBank.GitVersioning.dll:token 0x6000125+0x59
C:\Users\lollo\.nuget\packages\nerdbank.gitversioning\3.4.216\build\Nerdbank.GitVersioning.Inner.targets(17,5): error MSB4018:    at Nerdbank.GitVersioning.GitContext.Create(String path, String committish, Boolean writable) in NerdBank.GitVersioning.dll:token 0x6000048+0x11
C:\Users\lollo\.nuget\packages\nerdbank.gitversioning\3.4.216\build\Nerdbank.GitVersioning.Inner.targets(17,5): error MSB4018:    at Nerdbank.GitVersioning.Tasks.GetBuildVersion.ExecuteInner() in Nerdbank.GitVersioning.Tasks.dll:token 0x600009e+0x10d

[WildCard65]

LibGIT2 works (only via nbgv.exe, dotnet build fails with a DLL load error)

[AArnott]

My first guess would have been a corrupted file, but that would presumably prevent libgit2 from working. Any ideas, @qmfrederik?

The dotnet build failure with libgit2 is also concerning, and should be tracked in a separate issue that includes the exact error message. Can you file that, @WildCard65 ?

[WildCard65]

@AArnott The dotnet build failure with libgit2 is fairly simple, PInvoke is failing to find the native DLL, I managed to "solve" it by copying the DLL from MSBuildFull/lib/win32/x64 to MSBuildCore

[rhodosaur]

I am getting the same exception in certain repos from here:

Nerdbank.GitVersioning/src/NerdBank.GitVersioning/ManagedGit/ZLibStream.cs

Line 59 in 163380e

if (zlibHeader[0] != 0x78 || (zlibHeader[1] != 0x01 && zlibHeader[1] != 0x9C))

To me it looks like the zlib header check is just missing a couple of compression level settings. I dug up this table:

Level | Header
1     | 78 01
2     | 78 5E 
3     | 78 5E 
4     | 78 5E 
5     | 78 5E 
6     | 78 9C
7     | 78 DA
8     | 78 DA
9     | 78 DA

I'm getting a value of 78 5E for my repo and therefore it fails. Adding a check for 5E seems to solve the issue for me, but don't know of a way to change the compression level of a git repo, so haven't verified if the same thing works for levels 7-9.

[WildCard65]

core.compression -1:9

[qmfrederik]

@AArnott It looks like a couple of users are impacted by this.
You've merged #621 which should contain a fix.
Any chance you can push a new 3.4 version to NuGet?

[AArnott]

v3.4.220 releasing to nuget.org now.

[WildCard65]

@AArnott @qmfrederik I can confirm v3.4.220 fixes the issue.