public static void CreateFakeBranchPointingAtThePullRequestTip(this IGitRepository repo, ILog log, AuthenticationInfo authentication)
{
var remote = repo.Network.Remotes.Single();
log.Info("Fetching remote refs to see if there is a pull request ref");
var remoteTips = (string.IsNullOrEmpty(authentication.Username) ?
repo.GetRemoteTipsForAnonymousUser(remote) :
repo.GetRemoteTipsUsingUsernamePasswordCredentials(remote, authentication.Username, authentication.Password))
.ToList();
log.Info($"Remote Refs:{System.Environment.NewLine}" + string.Join(System.Environment.NewLine, remoteTips.Select(r => r.CanonicalName)));
var headTipSha = repo.Head.Tip.Sha;
var refs = remoteTips.Where(r => r.TargetIdentifier == headTipSha).ToList();
if (refs.Count == 0)
{
var message = $"Couldn't find any remote tips from remote '{remote.Url}' pointing at the commit '{headTipSha}'.";
throw new WarningException(message);
}
if (refs.Count > 1)
{
var names = string.Join(", ", refs.Select(r => r.CanonicalName));
var message = $"Found more than one remote tip from remote '{remote.Url}' pointing at the commit '{headTipSha}'. Unable to determine which one to use ({names}).";
throw new WarningException(message);
}
var reference = refs[0];
var canonicalName = reference.CanonicalName;
log.Info($"Found remote tip '{canonicalName}' pointing at the commit '{headTipSha}'.");
if (canonicalName.StartsWith("refs/tags"))
{
log.Info($"Checking out tag '{canonicalName}'");
repo.Commands.Checkout(reference.Target.Sha);
return;
}
if (!canonicalName.StartsWith("refs/pull/") && !canonicalName.StartsWith("refs/pull-requests/"))
{
var message = $"Remote tip '{canonicalName}' from remote '{remote.Url}' doesn't look like a valid pull request.";
throw new WarningException(message);
}
var fakeBranchName = canonicalName.Replace("refs/pull/", "refs/heads/pull/").Replace("refs/pull-requests/", "refs/heads/pull-requests/");
log.Info($"Creating fake local branch '{fakeBranchName}'.");
repo.Refs.Add(fakeBranchName, new ObjectId(headTipSha));
log.Info($"Checking local branch '{fakeBranchName}' out.");
repo.Commands.Checkout(fakeBranchName);
}