/// <summary>
/// Updates the target of a reference.
/// </summary>
/// <param name = "name">The canonical name of the reference.</param>
/// <param name = "canonicalRefNameOrObjectish">The target which can be either the canonical name of a reference or a revparse spec.</param>
/// <param name = "refsColl">The <see cref="ReferenceCollection"/> being worked with.</param>
/// <param name="logMessage">The optional message to log in the <see cref="ReflogCollection"/> of the <paramref name="name"/> reference.</param>
/// <returns>A new <see cref = "Reference" />.</returns>
public static Reference UpdateTarget(this ReferenceCollection refsColl, string name, string canonicalRefNameOrObjectish, string logMessage = null)
{
Ensure.ArgumentNotNullOrEmptyString(name, "name");
Ensure.ArgumentNotNullOrEmptyString(canonicalRefNameOrObjectish, "canonicalRefNameOrObjectish");
if (name == "HEAD")
{
return refsColl.Add("HEAD", canonicalRefNameOrObjectish, true);
}
Reference reference = refsColl[name];
var directReference = reference as DirectReference;
if (directReference != null)
{
return refsColl.UpdateTarget(directReference, canonicalRefNameOrObjectish, logMessage);
}
var symbolicReference = reference as SymbolicReference;
if (symbolicReference != null)
{
Reference targetRef;
RefState refState = TryResolveReference(out targetRef, refsColl, canonicalRefNameOrObjectish);
if (refState == RefState.DoesNotLookValid)
{
throw new ArgumentException(String.Format(CultureInfo.InvariantCulture, "The reference specified by {0} is a Symbolic reference, you must provide a reference canonical name as the target.", name), "canonicalRefNameOrObjectish");
}
return refsColl.UpdateTarget(symbolicReference, targetRef, logMessage);
}
throw new LibGit2SharpException(string.Format(CultureInfo.InvariantCulture, "Reference '{0}' has an unexpected type ('{1}').", name, reference.GetType()));
}
/// <summary>
/// Updates the target of a direct reference.
/// </summary>
/// <param name="directRef">The direct reference which target should be updated.</param>
/// <param name="objectish">The revparse spec of the target.</param>
/// <param name="refsColl">The <see cref="ReferenceCollection"/> being worked with.</param>
/// <param name="logMessage">The optional message to log in the <see cref="ReflogCollection"/> of the <paramref name="directRef"/> reference.</param>
/// <returns>A new <see cref="Reference"/>.</returns>
public static Reference UpdateTarget(this ReferenceCollection refsColl, Reference directRef, string objectish, string logMessage = null)
{
Ensure.ArgumentNotNull(directRef, "directRef");
Ensure.ArgumentNotNull(objectish, "objectish");
GitObject target = refsColl.repo.Lookup(objectish);
Ensure.GitObjectIsNotNull(target, objectish);
return(refsColl.UpdateTarget(directRef, target.Id, logMessage));
}