fix(pkg): pkg_deb changelog argument handling

pkg/private/deb/deb.bzl

@@ -116,7 +116,7 @@ def _pkg_deb_impl(ctx):
         fail("Neither description_file nor description attribute was specified")
 
     if ctx.attr.changelog:
-        args.append("--changelog" + "@" + ctx.file.changelog.path)
+        args.add("--changelog", "@" + ctx.file.changelog.path)
         files.append(ctx.file.changelog)
 
     # Built using can also be specified by a file or inlined (but is not mandatory)

tests/deb/BUILD

@@ -74,6 +74,7 @@ pkg_deb(
     name = "test_deb",
     breaks = ["oldbrokenpkg"],
     built_using = "some_test_data (0.1.2)",
+    changelog = "changelog",
     conffiles = [
         "/etc/nsswitch.conf",
         "/etc/other",

tests/deb/changelog

@@ -0,0 +1,5 @@
+fizzbuzz (4.5.6) trusty; urgency=low
+
+  * Add changelog coverage.
+
+ -- Some One <someone@somewhere.com>  Thu, 01 Jan 1970 00:00:00 +0000

tests/deb/pkg_deb_test.py

@@ -173,6 +173,7 @@ def test_description(self):
 
   def test_control_files(self):
     expected = [
+        {'name': './changelog', 'mode': 0o644},
         {'name': './conffiles', 'mode': 0o644},
         {'name': './config', 'mode': 0o755},
         {'name': './control', 'mode': 0o644},
@@ -189,6 +190,16 @@ def test_conffiles(self):
         conffiles,
         '/etc/nsswitch.conf\n/etc/other\n')
 
+  def test_changelog(self):
+    changelog = self.deb_file.get_deb_ctl_file('changelog')
+    self.assertEqual(
+        changelog,
+        'fizzbuzz (4.5.6) trusty; urgency=low\n'
+        '\n'
+        '  * Add changelog coverage.\n'
+        '\n'
+        ' -- Some One <someone@somewhere.com>  Thu, 01 Jan 1970 00:00:00 +0000\n')
+
   def test_config(self):
     config = self.deb_file.get_deb_ctl_file('config')
     self.assertEqual(config, '# test config file\n')