ComfyUI updates fail silently because of a PortableGit error

[jennygreene88]

I'm on the Windows build of 2.6.6.

When I click to update ComfyUI, it instantly reports success (without actually checking for updates), and this error is logged:

Error: System.ComponentModel.Win32Exception (267): An error occurred trying to start process 'C:\Users\gal\Downloads\StabilityMatrix-win-x64\Data\PortableGit\bin\git.exe' with working directory 'init'. The directory name is invalid.
   at System.Diagnostics.Process.StartWithCreateProcess(ProcessStartInfo startInfo)
   at StabilityMatrix.Core.Processes.ProcessRunner.StartTrackedProcess(Process process)
   at StabilityMatrix.Core.Processes.ProcessRunner.StartAnsiProcess(String fileName, String arguments, String workingDirectory, Action`1 outputDataReceived, IReadOnlyDictionary`2 environmentVariables)
   at StabilityMatrix.Avalonia.Helpers.WindowsPrerequisiteHelper.RunGit(ProcessArgs args, Action`1 onProcessOutput, String workingDirectory)
   at StabilityMatrix.Core.Models.Packages.BaseGitPackage.Update(InstalledPackage installedPackage, TorchVersion torchVersion, DownloadPackageVersionOptions versionOptions, IProgress`1 progress, Boolean includePrerelease, Action`1 onConsoleOutput)
   at StabilityMatrix.Core.Models.PackageModification.UpdatePackageStep.ExecuteAsync(IProgress`1 progress)
   at StabilityMatrix.Core.Models.PackageModification.PackageModificationRunner.ExecuteSteps(IReadOnlyList`1 steps)

[Sceptero]

Having same issue but with Stable Diffusion WebUI updates:

Error: System.ComponentModel.Win32Exception (267): An error occurred trying to start process 'E:\ai\stabilitymatrix\Data\PortableGit\bin\git.exe' with working directory 'init'. The directory name is invalid.
   at System.Diagnostics.Process.StartWithCreateProcess(ProcessStartInfo startInfo)
   at StabilityMatrix.Core.Processes.ProcessRunner.StartTrackedProcess(Process process)
   at StabilityMatrix.Core.Processes.ProcessRunner.StartAnsiProcess(String fileName, String arguments, String workingDirectory, Action`1 outputDataReceived, IReadOnlyDictionary`2 environmentVariables)
   at StabilityMatrix.Avalonia.Helpers.WindowsPrerequisiteHelper.RunGit(ProcessArgs args, Action`1 onProcessOutput, String workingDirectory)
   at StabilityMatrix.Core.Models.Packages.BaseGitPackage.Update(InstalledPackage installedPackage, TorchVersion torchVersion, DownloadPackageVersionOptions versionOptions, IProgress`1 progress, Boolean includePrerelease, Action`1 onConsoleOutput)
   at StabilityMatrix.Core.Models.PackageModification.UpdatePackageStep.ExecuteAsync(IProgress`1 progress)
   at StabilityMatrix.Core.Models.PackageModification.PackageModificationRunner.ExecuteSteps(IReadOnlyList`1 steps)

Tried removing the PortableGit directory hoping it might get redownloaded, but it only resulted in change of error message to:

An error occurred trying to start process 'E:\ai\stabilitymatrix\Data\PortableGit\bin\git.exe' with working directory 'init'. The system cannot find the file specified.

Perhaps the init working directory is the culprit?

EDIT:
I checked the sources and it seems that the string init is passed to the RunGit function as working directory argument, while it should've been a part of git ... command. I fixed the issue for myself by manually executing following git commands in stabilitymatrix\Data\Packages\Stable Diffusion WebUI directory:

git init
git remote add origin https://github.com/AUTOMATIC1111/stable-diffusion-webui

After that, the updater was able to update my package without any issues.