From a44b7e7f5c114c9a48131abbeef88422f28669d1 Mon Sep 17 00:00:00 2001
From: Phil Christensen <pchristensen@logicworks.net>
Date: Fri, 9 Feb 2018 14:49:40 -0500
Subject: [PATCH] implementing mockable EBS snapshot copies

---
 moto/ec2/models.py                        |  9 +++++++++
 moto/ec2/responses/elastic_block_store.py | 14 ++++++++++++--
 2 files changed, 21 insertions(+), 2 deletions(-)

diff --git a/moto/ec2/models.py b/moto/ec2/models.py
index c94752ef6..31bfb4839 100755
--- a/moto/ec2/models.py
+++ b/moto/ec2/models.py
@@ -1971,6 +1971,15 @@ class EBSBackend(object):
             matches = generic_filter(filters, matches)
         return matches
 
+    def copy_snapshot(self, source_snapshot_id, source_region, description=None):
+        source_snapshot = ec2_backends[source_region].describe_snapshots(
+            snapshot_ids=[source_snapshot_id])[0]
+        snapshot_id = random_snapshot_id()
+        snapshot = Snapshot(self, snapshot_id, volume=source_snapshot.volume,
+            description=description, encrypted=source_snapshot.encrypted)
+        self.snapshots[snapshot_id] = snapshot
+        return snapshot
+
     def get_snapshot(self, snapshot_id):
         snapshot = self.snapshots.get(snapshot_id, None)
         if not snapshot:
diff --git a/moto/ec2/responses/elastic_block_store.py b/moto/ec2/responses/elastic_block_store.py
index cdc5b18e9..aa0d7f73b 100644
--- a/moto/ec2/responses/elastic_block_store.py
+++ b/moto/ec2/responses/elastic_block_store.py
@@ -16,9 +16,14 @@ class ElasticBlockStore(BaseResponse):
             return template.render(attachment=attachment)
 
     def copy_snapshot(self):
+        source_snapshot_id = self._get_param('SourceSnapshotId')
+        source_region = self._get_param('SourceRegion')
+        description = self._get_param('Description')
         if self.is_not_dryrun('CopySnapshot'):
-            raise NotImplementedError(
-                'ElasticBlockStore.copy_snapshot is not yet implemented')
+            snapshot = self.ec2_backend.copy_snapshot(
+                source_snapshot_id, source_region, description)
+            template = self.response_template(COPY_SNAPSHOT_RESPONSE)
+            return template.render(snapshot=snapshot)
 
     def create_snapshot(self):
         volume_id = self._get_param('VolumeId')
@@ -248,6 +253,11 @@ CREATE_SNAPSHOT_RESPONSE = """<CreateSnapshotResponse xmlns="http://ec2.amazonaw
   </tagSet>
 </CreateSnapshotResponse>"""
 
+COPY_SNAPSHOT_RESPONSE = """<CopySnapshotResponse xmlns="http://ec2.amazonaws.com/doc/2016-11-15/">
+  <requestId>59dbff89-35bd-4eac-99ed-be587EXAMPLE</requestId>
+  <snapshotId>{{ snapshot.id }}</snapshotId>
+</CopySnapshotResponse>"""
+
 DESCRIBE_SNAPSHOTS_RESPONSE = """<DescribeSnapshotsResponse xmlns="http://ec2.amazonaws.com/doc/2013-10-15/">
    <requestId>59dbff89-35bd-4eac-99ed-be587EXAMPLE</requestId>
    <snapshotSet>