New flag -no-remove for aptly snapshot pull.

system/t05_snapshot/PullSnapshot11Test_gold

@@ -0,0 +1,15 @@
+Dependencies would be pulled into snapshot:
+    [snap1]: Snapshot from mirror [wheezy-main]: http://mirror.yandex.ru/debian/ wheezy
+from snapshot:
+    [snap2]: Snapshot from mirror [wheezy-backports]: http://mirror.yandex.ru/debian/ wheezy-backports
+and result would be saved as new snapshot snap3.
+Loading packages (59249)...
+Building indexes...
+[+] rsyslog_7.4.4-1~bpo70+1_amd64 added
+[+] libestr0_0.1.9-1~bpo70+1_amd64 added
+[+] init-system-helpers_1.11~bpo70.1_all added
+[+] rsyslog_7.4.4-1~bpo70+1_i386 added
+[+] libestr0_0.1.9-1~bpo70+1_i386 added
+
+Snapshot snap3 successfully created.
+You can run 'aptly publish snapshot snap3' to publish snapshot as Debian repository.

system/t05_snapshot/pull.py

@@ -175,3 +175,23 @@ class PullSnapshot10Test(BaseTest):
 
         self.check_output()
         self.check_cmd_output("aptly snapshot show --with-packages snap3", "snapshot_show", match_prepare=remove_created_at)
+
+
+class PullSnapshot11Test(BaseTest):
+    """
+    pull snapshot: -no-remove
+    """
+    fixtureDB = True
+    fixtureCmds = [
+        "aptly snapshot create snap1 from mirror wheezy-main",
+        "aptly snapshot create snap2 from mirror wheezy-backports",
+    ]
+    runCmd = "aptly snapshot pull -no-remove snap1 snap2 snap3 'rsyslog (>= 7.4.4)'"
+    outputMatchPrepare = lambda _, output: "\n".join(sorted(output.split("\n")))
+
+    def check(self):
+        def remove_created_at(s):
+            return re.sub(r"Created At: [0-9:A-Za-z -]+\n", "", s)
+
+        self.check_output()
+        self.check_cmd_output("aptly snapshot show -with-packages snap3", "snapshot_show", match_prepare=remove_created_at)