private static Commit LookUpCommit(IRepository repository, string committish)
{
GitObject obj = repository.Lookup(committish);
Ensure.GitObjectIsNotNull(obj, committish);
return(obj.Peel <Commit>(true));
}
/// <summary>
/// Checkout the specified <see cref="Branch"/>, reference or SHA.
/// <para>
/// If the committishOrBranchSpec parameter resolves to a branch name, then the checked out HEAD will
/// will point to the branch. Otherwise, the HEAD will be detached, pointing at the commit sha.
/// </para>
/// </summary>
/// <param name="repository">The repository to act on</param>
/// <param name="committishOrBranchSpec">A revparse spec for the commit or branch to checkout.</param>
/// <param name="options"><see cref="CheckoutOptions"/> controlling checkout behavior.</param>
/// <returns>The <see cref="Branch"/> that was checked out.</returns>
public static Branch Checkout(IRepository repository, string committishOrBranchSpec, CheckoutOptions options)
{
Ensure.ArgumentNotNull(repository, "repository");
Ensure.ArgumentNotNullOrEmptyString(committishOrBranchSpec, "committishOrBranchSpec");
Ensure.ArgumentNotNull(options, "options");
Reference reference = null;
GitObject obj = null;
Branch branch = null;
try
{
repository.RevParse(committishOrBranchSpec, out reference, out obj);
}
catch (NotFoundException)
{
// If committishOrBranchSpec is not a local branch but matches a tracking branch
// in exactly one remote, use it. This is the "git checkout" command's default behavior.
// https://git-scm.com/docs/git-checkout#Documentation/git-checkout.txt-emgitcheckoutemltbranchgt
var remoteBranches = repository.Network.Remotes
.SelectMany(r => repository.Branches.Where(b =>
b.IsRemote &&
b.CanonicalName == $"refs/remotes/{r.Name}/{committishOrBranchSpec}"))
.ToList();
if (remoteBranches.Count == 1)
{
branch = repository.CreateBranch(committishOrBranchSpec, remoteBranches[0].Tip);
repository.Branches.Update(branch, b => b.TrackedBranch = remoteBranches[0].CanonicalName);
return(Checkout(repository, branch, options));
}
if (remoteBranches.Count > 1)
{
throw new AmbiguousSpecificationException($"'{committishOrBranchSpec}' matched multiple ({remoteBranches.Count}) remote tracking branches");
}
throw;
}
if (reference != null && reference.IsLocalBranch)
{
branch = repository.Branches[reference.CanonicalName];
return(Checkout(repository, branch, options));
}
Commit commit = obj.Peel <Commit>(true);
Checkout(repository, commit.Tree, options, committishOrBranchSpec);
return(repository.Head);
}