#update-release
    -// Merge dev branch to release
    @{
        Parallel.ForEach(GetAllRepos(), CloneOrUpdate);

        Log.Info("************************************* Checking repos for diffs *************************");

        foreach (var repo in GetAllRepos())
        {
            Log.Info("Checking repo: " + repo);
            // Check if the repo previously had a release branch
            try
            {
                GitCommand(repo, "rev-parse --verify --quiet origin/release");
            }
            catch
            {
                Log.Info("Repository " + repo + " does not have a release branch.");
                continue;
            }

            try
            {
                GitCommand(repo, "log -1 --exit-code origin/dev..origin/release");
            }
            catch
            {
                Log.Warn("Unmerged changes in repository " + repo);
                GitCommand(repo, "log origin/dev..origin/release");
                throw;
            }
        }

        Log.Info("No conflicts in repos, continuing with creating release branch.");

        foreach (var repo in GetAllRepos())
        {
            GitCommand(repo, "checkout origin/dev -B release");
            var filesChanged = false;

            // Update NuGet.Config
            var nugetConfigPath = Path.Combine(repo, "NuGet.config");
            if (File.Exists(nugetConfigPath))
            {
                var original = File.ReadAllText(nugetConfigPath);
                var modified = original
                    .Replace("https://dotnet.myget.org/F/aspnetcore-ci-dev", "https://dotnet.myget.org/F/aspnetcore-ci-release");

                if (!string.Equals(original, modified, StringComparison.Ordinal))
                {
                    File.WriteAllText(nugetConfigPath, modified);
                    GitCommand(repo, "add NuGet.config");
                    filesChanged = true;
                }
            }

            var buildPs1Path = Path.Combine(repo, "build.ps1");
            if (File.Exists(buildPs1Path))
            {
                var original = File.ReadAllText(buildPs1Path);
                var modified = original
                    .Replace("https://github.com/aspnet/KoreBuild/archive/dev.zip", "https://github.com/aspnet/KoreBuild/archive/release.zip");

                if (!string.Equals(original, modified, StringComparison.Ordinal))
                {
                    File.WriteAllText(buildPs1Path, modified);
                    GitCommand(repo, "add build.ps1");
                    filesChanged = true;
                }
            }

            var buildShPath = Path.Combine(repo, "build.sh");
            if (File.Exists(buildShPath))
            {
                var original = File.ReadAllText(buildShPath);
                var modified = original
                    .Replace("https://github.com/aspnet/KoreBuild/archive/dev.zip", "https://github.com/aspnet/KoreBuild/archive/release.zip");

                if (!string.Equals(original, modified, StringComparison.Ordinal))
                {
                    File.WriteAllText(buildShPath, modified);
                    GitCommand(repo, "add build.sh");
                    filesChanged = true;
                }
            }

            if (filesChanged)
            {
                GitCommand(repo, "commit -m \"Updating to release.\"");
            }

            GitCommand(repo, "push origin release:release");
            GitCommand(repo, "checkout origin/dev -B dev");
            GitCommand(repo, "merge release -s ours");
            GitCommand(repo, "push origin dev:dev");
        }
    }

#update-master .pull-all
    -// Merge release branch to master
    -// Pin versions of packages in project.json and updated project.lock.json
    -// More information https://github.com/aspnet/Universe/wiki/%23pin-version-:-Pinning-package-version-for-a-particular-release-in-project.json
    @{
        var koreBuildTag = GetEnvironmentParameter("KOREBUILD_TAG");
        var coherenceFeed = GetEnvironmentParameter("COHERENCE_FEED");

        if (string.IsNullOrEmpty(coherenceFeed))
        {
            throw new Exception("COHERENCE_FEED not specified. Usually this is Packages-NoTimestamp directory of Coherence-Signed.");
        }

        if (string.IsNullOrEmpty(koreBuildTag))
        {
            throw new Exception("KOREBUILD_TAG environment variable is not specified.");
        }

        var excludeReposForJson = new[]
        {
          "Coherence",
          "Coherence-Signed",
          "dnvm",
          "Entropy",
          "Setup",
          "libuv-build",
        };

        Exec("dotnet", "restore", "tools/PinVersion");

        foreach (var repo in GetAllRepos())
        {
            GitCommand(repo, "checkout origin/release -B master");

            if (File.Exists(Path.Combine(repo, "NuGet.config")))
            {
                File.Copy(Path.Combine("build-template", "NuGet.master.config"),
                      Path.Combine(repo, "NuGet.config"),
                      overwrite: true);
                GitCommand(repo, "add NuGet.*");
                GitCommand(repo, "commit -m \"Updating NuGet.config\"");
            }
        }

        var reposToPin = GetAllRepos().Except(excludeReposForJson);
        var repositoryNamesFile = Path.GetTempFileName();

        File.WriteAllLines(repositoryNamesFile, reposToPin.Select(r => Path.Combine(Directory.GetCurrentDirectory(), r)));
        var pinToolsArgs = string.Format(@"run -p tools/PinVersion ""{0}"" ""{1}"" ""{2}""",
            coherenceFeed,
            koreBuildTag,
            repositoryNamesFile);
        Exec("dotnet", pinToolsArgs, "");
        try
        {
            File.Delete(repositoryNamesFile);
        }
        catch
        {
        }

        foreach (var repo in reposToPin)
        {
            var repoPath = Path.Combine(Directory.GetCurrentDirectory(), repo);
            try
            {
                GitCommand(repo, "commit -am \"Updating json files to pin versions and build files to pin KoreBuild\"");
            }
            catch
            {
                // Don't fail if there was nothing to add.
            }
        }

        foreach (var repo in GetAllRepos())
        {
            GitCommand(repo, "push origin +master:master");
        }

        CallTarget("update-prerelease-tags");
    }

#update-prerelease-tags
    -// Update tags on each repo to have the latest release tag
    @{
        var preReleaseTag = GetEnvironmentParameter("PRERELEASETAG");
        if (string.IsNullOrEmpty(preReleaseTag))
        {
            throw new Exception("PRERELEASETAG tag not defined");
        }

        var versionFile = "version.txt";

        foreach (var repo in GetAllRepos())
        {
            GitCommand(repo, "pull --tags");
            string version = null;

            try
            {
                GitCommand(repo, string.Format("describe --tags > ..\\{0}", versionFile));
            }
            catch
            {
                version = "1.0.0-" + preReleaseTag;
                Log.Warn(string.Format("{0} repo not tagged. Using default version {1}.", repo, version));
            }

            if (version == null)
            {
                version = File.ReadAllText(versionFile);
                File.Delete(versionFile);
            }

            Log.Info(string.Format("Current version on repo {0} is {1}", repo, version));

            var majorVersion = version.Split(new string[]{"-"}, StringSplitOptions.None)[0];

            var newVersion = majorVersion + string.Format("-{0}", preReleaseTag);

            Log.Info(string.Format("New version for repo is {0}", newVersion));

            GitCommand(repo, string.Format("tag -f -a {0} -m \"Tag for new release {0}\"", newVersion));

            GitCommand(repo, "push origin --tags +" + newVersion);
        }
    }

functions
    @{
        IEnumerable<string> GetAllRepos()
        {
            var nonDefaultRepos = new[]
            {
              "CoreCLR",
              "Coherence",
              "Coherence-Signed",
              "KoreBuild",
              "Universe",
              "libuv-build",
            };

            return Enumerable.Concat(nonDefaultRepos, repositories);
        }
    }