how to checkout from head_sha ( github check_run )

System information

• node version: 10.15.3
• npm or yarn version: 6.9.0
• OS/version/architecture: Ubuntu 18.04.2 LTS / 4.15.0-47-generic / x64
• Applicable nodegit version: 0.24.1
• @types/nodegit version: 0.24.6

hi.
i'm porting below code to nodegit

Creating CI tests with the Checks API > Step 2.2. Cloning the repository

# Clones the repository to the current working directory, updates the
# contents using Git pull, and checks out the ref.
#
# full_repo_name  - The owner and repo. Ex: octocat/hello-world
# repository      - The repository name
# ref             - The branch, commit SHA, or tag to check out
def clone_repository(full_repo_name, repository, ref)
  @git = Git.clone("https://x-access-token:#{@installation_token.to_s}@github.com/#{full_repo_name}.git", repository)
  pwd = Dir.getwd()
  Dir.chdir(repository)
  @git.pull
  @git.checkout(ref)
  Dir.chdir(pwd)
end

# ***** RUN A CI TEST *****
full_repo_name = @payload['repository']['full_name']
repository     = @payload['repository']['name']
head_sha       = @payload['check_run']['head_sha']

clone_repository(full_repo_name, repository, head_sha)

but, can not checkout from 'commit SHA (head_sha)'

github check_run payload
{
"payload": {
  "check_run": {
    "head_sha": "002a9d7011784e9f77359611a0139deecb8d17f7",

Repository#checkoutBranch /
Repository#checkoutRef /
Commit.lookup > Commit#getTree > Checkout.tree
not working.

how can i do?

thanks.

Start with the linked Repository#checkoutBranch and Repository#checkoutRef documentation, then review the Commit.lookup, Commit#getTree, and Checkout.tree references. Reproduce the checkout using the supplied head_sha and capture the failure details. Done means identifying a documented NodeGit checkout path for that commit SHA or clarifying the missing usage information.