Implement new command aptly repo create ... from snapshot ...

system/t09_repo/CreateRepo7Test_gold

@@ -0,0 +1,3 @@
+
+Local repo [repo2] successfully added.
+You can run 'aptly repo add repo2 ...' to add packages to repository.

system/t09_repo/CreateRepo7Test_repo_show

@@ -0,0 +1,9 @@
+Name: repo2
+Comment: 
+Default Distribution: 
+Default Component: main
+Number of packages: 3
+Packages:
+  libboost-program-options-dev_1.49.0.1_i386
+  pyspi_0.6.1-1.3_source
+  pyspi_0.6.1-1.4_source

system/t09_repo/CreateRepo8Test_gold

@@ -0,0 +1 @@
+ERROR: unable to load source snapshot: snapshot with name snap-missing not found

system/t09_repo/create.py

@@ -63,3 +63,27 @@ class CreateRepo6Test(BaseTest):
     runCmd = "aptly repo create -uploaders-file=${changes}/uploaders-not-found.json repo6"
     expectedCode = 1
     outputMatchPrepare = changesRemove
+
+
+class CreateRepo7Test(BaseTest):
+    """
+    create local repo: from snapshot
+    """
+    fixtureCmds = [
+        "aptly repo create repo1",
+        "aptly repo add repo1 ${files}",
+        "aptly snapshot create snap1 from repo repo1",
+    ]
+    runCmd = "aptly repo create repo2 from snapshot snap1"
+
+    def check(self):
+        self.check_output()
+        self.check_cmd_output("aptly repo show -with-packages repo2", "repo_show")
+
+
+class CreateRepo8Test(BaseTest):
+    """
+    create local repo: from missing snapshot
+    """
+    runCmd = "aptly repo create repo2 from snapshot snap-missing"
+    expectedCode = 1