private Branch GetMainline(Commit baseVersionSource)
{
var mainlineBranchConfigs = context.FullConfiguration.Branches.Where(b => b.Value.IsMainline == true).ToList();
var mainlineBranches = repositoryMetadataProvider.GetMainlineBranches(context.CurrentCommit, mainlineBranchConfigs);
var allMainlines = mainlineBranches.Values.SelectMany(branches => branches.Select(b => b.FriendlyName));
log.Info("Found possible mainline branches: " + string.Join(", ", allMainlines));
// Find closest mainline branch
var firstMatchingCommit = context.CurrentBranch.Commits.First(c => mainlineBranches.ContainsKey(c.Sha));
var possibleMainlineBranches = mainlineBranches[firstMatchingCommit.Sha];
if (possibleMainlineBranches.Count == 1)
{
var mainlineBranch = possibleMainlineBranches[0];
log.Info("Mainline for current branch is " + mainlineBranch.FriendlyName);
return(mainlineBranch);
}
// prefer current branch, if it is a mainline branch
if (possibleMainlineBranches.Any(context.CurrentBranch.IsSameBranch))
{
log.Info($"Choosing {context.CurrentBranch.FriendlyName} as mainline because it is the current branch");
return(context.CurrentBranch);
}
// prefer a branch on which the merge base was a direct commit, if there is such a branch
var firstMatchingCommitBranch = possibleMainlineBranches.FirstOrDefault(b => repositoryMetadataProvider.GetMatchingCommitBranch(baseVersionSource, b, firstMatchingCommit));
if (firstMatchingCommitBranch != null)
{
var message = string.Format(
"Choosing {0} as mainline because {1}'s merge base was a direct commit to {0}",
firstMatchingCommitBranch.FriendlyName,
context.CurrentBranch.FriendlyName);
log.Info(message);
return(firstMatchingCommitBranch);
}
var chosenMainline = possibleMainlineBranches[0];
log.Info($"Multiple mainlines ({string.Join(", ", possibleMainlineBranches.Select(b => b.FriendlyName))}) have the same merge base for the current branch, choosing {chosenMainline.FriendlyName} because we found that branch first...");
return(chosenMainline);
}
