How to find if a branch is merged into another branch?

[shinkathe]

Is this sort of feature already implemented into libgit2sharp?

This is basically git branch --merged

[norek]

Hi below is my solution it seems to work:

using (var repo = new Repository(@"repoPath"))
{
     //Get reference of head
     var headRef = repo.Refs.Where(r => r.CanonicalName == repo.Head.CanonicalName);

      //get only local branches
      foreach (var branch in repo.Branches.Where(d => !d.IsRemote))
      {
           //check if local branch tip is rechable from HEAD
           var refs = repo.Refs.ReachableFrom(headRef, new[] { branch.Tip });

           if (refs.Any())
           {
               //This branch was merged
           }
      }
}

Can anyone can look at it? Maybe i should create PR for documentation update?

[wan-liyang]

how about to find the source branch tip.sha in target branch commits ?

string sourceSha = sourceBranch.Tip.Sha; var commit = targetBranch.Commits.Where(p => p.Sha.Equals(sourceSha, StringComparison.OrdinalIgnoreCase)).FirstOrDefault(); if (commit != null) { return true; } return false;

[chrismoutray]

@norek I found this really slow to execute until I added ToList() onto the end of the line that gets the ref of the head.
var headRef = repo.Refs.Where(r => r.CanonicalName == repo.Head.CanonicalName).ToList();

[robertsynoradzki]

To check if, for example, a feature was merged to main, do this:

var repo = new Repository(@"YOUR REPO PATH");
var main = repo.Branches["origin/main"];
var feat = repo.Branches["YOUR FEATURE BRANCH NAME"];

var isMerged = repo.Refs
    .ReachableFrom(new[] { main.Reference }, new[] { feat.Tip })
    .Any();

⚠️ Don't use:

var isMerged = main.Commits.Any(commit => commit == feat.Tip);

because even though it also works, it's much less efficient, and the efficiency will get even slower with growing number of commits in main. For example, in my repository with 525 commits .Any() was already 50 times (!) slower than .ReachableFrom().

[hrcprog]

Hi below is my solution it seems to work:

using (var repo = new Repository(@"repoPath"))
{
     //Get reference of head
     var headRef = repo.Refs.Where(r => r.CanonicalName == repo.Head.CanonicalName);

      //get only local branches
      foreach (var branch in repo.Branches.Where(d => !d.IsRemote))
      {
           //check if local branch tip is rechable from HEAD
           var refs = repo.Refs.ReachableFrom(headRef, new[] { branch.Tip });

           if (refs.Any())
           {
               //This branch was merged
           }
      }
}

Can anyone can look at it? Maybe i should create PR for documentation update?

this worked for me and Ok.