Push files from Azure function triggered by blobstorage fails on Exception Reference cannot be updated

[istisan]

I use the following code on an Azure function to push files on a github repository when a new file is uploaded to a blobstorage, that trigger the function. But it doesn't work if multiple file are uploaded to blobstorage in a short time interval: only one random file is pushed to github and then the function throw an exception; in the log: Description: The process was terminated due to an unhandled exception. Exception Info: Octokit.ApiValidationException: Reference cannot be updated {"message":"Reference cannot be updated","documentation_url":"https://docs.github.com/rest/reference/git..."}. This is the code:

public static async void PushToGithub(string fileName, Stream myBlob)
    {
        // github variables
        var owner = GITHUB_USER;
        var repo = GITHUB_REPO;
        var token = GITHUB_TOKEN;

        //Create our Client
        var github = new GitHubClient(new ProductHeaderValue("GithubCommit"));
        var tokenAuth = new Credentials(token);

        github.Credentials = tokenAuth;

        var headMasterRef = "heads/master";

        // Get reference of master branch
        var masterReference = await github.Git.Reference.Get(owner, repo, headMasterRef);
        // Get the laster commit of this branch
        var latestCommit = await github.Git.Commit.Get(owner, repo, masterReference.Object.Sha);

        // For image, get image content and convert it to base64
        byte[] bytes;
        using (var memoryStream = new MemoryStream())
        {
            myBlob.Position = 0;
            myBlob.CopyTo(memoryStream);
            bytes = memoryStream.ToArray();
        }

        var pdfBase64 = Convert.ToBase64String(bytes);
        // Create blob
        var pdfBlob = new NewBlob { Encoding = EncodingType.Base64, Content = (pdfBase64) };
        var pdfBlobRef = await github.Git.Blob.Create(owner, repo, pdfBlob);

        // Create new Tree
        var nt = new NewTree { BaseTree = latestCommit.Tree.Sha };
        // Add items based on blobs
        nt.Tree.Add(new NewTreeItem { Path = fileName, Mode = "100644", Type = TreeType.Blob, Sha = pdfBlobRef.Sha });

        var newTree = await github.Git.Tree.Create(owner, repo, nt);

        // Create Commit
        var newCommit = new NewCommit("File update " + DateTime.UtcNow, newTree.Sha, masterReference.Object.Sha);
        var commit = await github.Git.Commit.Create(owner, repo, newCommit);

        // Update HEAD with the commit
        await github.Git.Reference.Update(owner, repo, headMasterRef, new ReferenceUpdate(commit.Sha, true));
    }

How can I solve so it pushes correctly to github all the files that are uploaded on the blobstorage? Thanks in advance, Marco

[shiftkey]

@istisan it's hard to say what the root cause is without a bit more context but I wonder if your master branch has some sort of protection set.

await github.Git.Reference.Update(owner, repo, headMasterRef, new ReferenceUpdate(commit.Sha, true));

The true parameter on the ReferenceUpdate here is to not enforce a "fast-forward" update of the ref, so if the API is rejecting you with a "Reference cannot be updated" message it could be that the repository requires changes to that branch to go through a PR review workflow (or something like that).

[Aarojas3012a]

[istisan]

@Aarojas3012a I can't see the image you attached. @shiftkey so do you think to set the parameter to false? How do I check if there is a sort of protection set on master branch?

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