in teamcity-premerge-agent/src/main/java/jetbrains/buildServer/premerge/PremergeBranchSupportImpl.java [74:78]
protected AgentGitFacade getFacade(String repoRelativePath) {
GitFactory gitFactory = myProcess.getGitMetaFactory().createFactory(myProcess.getSshService(),
new BuildContext(myProcess.getBuild(), myConfig, mySshKnownHostsManager));
return gitFactory.create(new File(myProcess.getBuild().getCheckoutDirectory().getAbsolutePath() + "/" + repoRelativePath));
}