porting 7.6-rc1 into 8

src/Umbraco.Core/Deploy/IDeployContext.cs

@@ -0,0 +1,42 @@
+using System;
+using System.Collections.Generic;
+
+namespace Umbraco.Core.Deploy
+{
+    /// <summary>
+    /// Represents a deployment context.
+    /// </summary>
+    public interface IDeployContext
+    {
+        /// <summary>
+        /// Gets the unique identifier of the deployment.
+        /// </summary>
+        Guid SessionId { get; }
+
+        /// <summary>
+        /// Gets the file source.
+        /// </summary>
+        /// <remarks>The file source is used to obtain files from the source environment.</remarks>
+        IFileSource FileSource { get; }
+
+        /// <summary>
+        /// Gets the next number in a numerical sequence.
+        /// </summary>
+        /// <returns>The next sequence number.</returns>
+        /// <remarks>Can be used to uniquely number things during a deployment.</remarks>
+        int NextSeq();
+
+        /// <summary>
+        /// Gets items.
+        /// </summary>
+        IDictionary<string, object> Items { get; }
+
+        /// <summary>
+        /// Gets item.
+        /// </summary>
+        /// <typeparam name="T">The type of the item.</typeparam>
+        /// <param name="key">The key of the item.</param>
+        /// <returns>The item with the specified key and type, if any, else null.</returns>
+        T Item<T>(string key) where T : class;
+    }
+}