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Development and debugging

Start by cloning this repository:

git clone https://github.com/microsoft/Git-Credential-Manager-Core

Building

The Git-Credential-Manager.sln solution can be opened and built in Visual Studio, Visual Studio for Mac, Visual Studio Code, or JetBrains Rider.

macOS

To build from inside an IDE, make sure to select the MacDebug or MacRelease solution configurations.

To build from the command line, run:

dotnet build -c MacDebug

You can find a copy of the installer .pkg file in out/osx/Installer.Mac/pkg/Debug.

The flat binaries can also be found in out/osx/Installer.Mac/pkg/Debug/payload.

Windows

To build from inside an IDE, make sure to select the WindowsDebug or WindowsRelease solution configurations.

To build from the command line, run:

msbuild /t:restore /p:Configuration=WindowsDebug
msbuild /p:Configuration=WindowsDebug

You can find a copy of the installer .exe file in out\windows\Installer.Windows\bin\Debug\net461.

The flat binaries can also be found in out\windows\Payload.Windows\bin\Debug\net461\win-x86.

Linux

The two available solution configurations are LinuxDebug and LinuxRelease.

To build from the command line, run:

dotnet build -c LinuxDebug

You can find a copy of the Debian package (.deb) file in out/linux/Packaging.Linux/deb/Debug.

The flat binaries can also be found in out/linux/Packaging.Linux/payload/Debug.

Debugging

To debug from inside an IDE you'll want to set Git-Credential-Manager as the startup project, and specify one of get, store, or erase as a program argument.

To simulate Git interacting with GCM Core, when you start from your IDE of choice, you'll need to enter the following information over standard input:

protocol=http<LF>
host=<HOSTNAME><LF>
<LF>
<LF>

..where <HOSTNAME> is a supported hostname such as github.com, and <LF> is a line feed (or CRLF, we support both!).

You may also include the following optional fields, depending on your scenario:

username=<USERNAME><LF>
password=<PASSWORD><LF>

For more information about how Git interacts with credential helpers, please read Git's documentation.

Attaching to a running process

If you want to debug an already running GCM Core process, set the GCM_DEBUG environment variable to 1 or true. The process will wait on launch for a debugger to attach before continuing.

This is useful when debugging interactions between GCM Core and Git, and you want Git to be the one launching us.

Collect trace output

If you want to debug a release build or installation of GCM Core, you can set the GCM_TRACE environment variable to 1 to print trace information to standard error, or to an absolute file path to write trace information to a file.

For example:

$ GCM_TRACE=1 git-credential-manager-core version
> 18:47:56.526712 ...er/Application.cs:69 trace: [RunInternalAsync] Git Credential Manager version 2.0.124-beta+e1ebbe1517 (macOS, .NET Core 3.1.3) 'version'
> Git Credential Manager version 2.0.124-beta+e1ebbe1517 (macOS, .NET Core 3.1.3)