Bring Host build into separate project

build_projects/shared-build-targets-utils/Utils/BranchInfo.cs

@@ -0,0 +1,47 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Net.Http;
+using System.Text;
+using Microsoft.DotNet.Cli.Build.Framework;
+using Microsoft.WindowsAzure.Storage;
+using Microsoft.WindowsAzure.Storage.Blob;
+
+using static Microsoft.DotNet.Cli.Build.Framework.BuildHelpers;
+
+namespace Microsoft.DotNet.Cli.Build
+{
+    public class BranchInfo
+    {
+        private static readonly string s_branchInfoFileName = "branchinfo.txt";
+
+        private string _repoRoot;
+        private string _branchInfoFile;
+
+        public IDictionary<string, string> Entries { get; set; }
+
+        public BranchInfo(string repoRoot)
+        {
+            _repoRoot = repoRoot;
+            _branchInfoFile = Path.Combine(_repoRoot, s_branchInfoFileName);
+
+            Entries = ReadBranchInfo(_branchInfoFile);
+        }
+
+        private IDictionary<string, string> ReadBranchInfo(string path)
+        {
+            var lines = File.ReadAllLines(path);
+            var dict = new Dictionary<string, string>();
+            foreach (var line in lines)
+            {
+                if (!line.Trim().StartsWith("#") && !string.IsNullOrWhiteSpace(line))
+                {
+                    var splat = line.Split(new[] { '=' }, 2);
+                    dict[splat[0]] = splat[1];
+                }
+            }
+            return dict;
+        }
+    }
+}