diff --git a/legacy.constraints b/legacy.constraints
new file mode 100644
index 0000000..ad683cf
--- /dev/null
+++ b/legacy.constraints
@@ -0,0 +1,9 @@
+# These constraints are applied during testing with python2.
+# Old versions of libraries can be added here if you want to
+# ensure pubtools-quay works with those.
+PyYAML < 5.1
+jsonschema==2.3.0
+pluggy==0.5.2
+
+# For compatibility with old pluggy
+pytest-cov<2
diff --git a/pubtools/iib/iib_ops.py b/pubtools/iib/iib_ops.py
index ddf4455..10d522d 100644
--- a/pubtools/iib/iib_ops.py
+++ b/pubtools/iib/iib_ops.py
@@ -125,6 +125,13 @@
         "required": False,
         "type": bool,
     },
+    ("--build-tag",): {
+        "group": "IIB service",
+        "help": "extra tags to apply on built index image in temp namespace",
+        "required": False,
+        "type": str,
+        "action": "append",
+    },
 }
 
 ADD_CMD_ARGS = CMD_ARGS.copy()
@@ -237,6 +244,9 @@ def _iib_op_main(args, operation=None, items_final_state="PUSHED"):
     if args.overwrite_from_index_token:
         extra_args["overwrite_from_index_token"] = args.overwrite_from_index_token
 
+    if args.build_tag:
+        extra_args["build_tags"] = args.build_tag
+
     build_details = bundle_op(
         args.index_image,
         args.bundle if operation == "add_bundles" else args.operator,
diff --git a/tests/test_iib_ops.py b/tests/test_iib_ops.py
index ed38ca1..2b913de 100644
--- a/tests/test_iib_ops.py
+++ b/tests/test_iib_ops.py
@@ -155,6 +155,10 @@ def fixture_common_iib_op_args():
         "example@REALM",
         "--iib-insecure",
         "--overwrite-from-index",
+        "--build-tag",
+        "extra-tag-1",
+        "--build-tag",
+        "extra-tag-2",
     ]
 
 
@@ -174,6 +178,7 @@ def add_bundles_mock_calls_tester(
         overwrite_from_index=True,
         overwrite_from_index_token="overwrite_from_index_token",
         deprecation_list=["bundle1"],
+        build_tags=["extra-tag-1", "extra-tag-2"],
     )
     fixture_iib_client.assert_called_once_with(
         "iib-server", auth=fixture_iib_krb_auth.return_value, ssl_verify=False
@@ -198,6 +203,7 @@ def add_bundles_mock_calls_tester_empty_deprecation_list(
         binary_image="binary-image",
         overwrite_from_index=True,
         overwrite_from_index_token="overwrite_from_index_token",
+        build_tags=["extra-tag-1", "extra-tag-2"],
     )
     fixture_iib_client.assert_called_once_with(
         "iib-server", auth=fixture_iib_krb_auth.return_value, ssl_verify=False
@@ -223,6 +229,7 @@ def add_bundles_mock_calls_tester_deprecation_bundles(
         overwrite_from_index=True,
         overwrite_from_index_token="overwrite_from_index_token",
         deprecation_list=["bundle1", "bundle2"],
+        build_tags=["extra-tag-1", "extra-tag-2"],
     )
     fixture_iib_client.assert_called_once_with(
         "iib-server", auth=fixture_iib_krb_auth.return_value, ssl_verify=False
@@ -247,6 +254,7 @@ def add_bundles_mock_calls_tester_not_called(
         binary_image="binary-image",
         overwrite_from_index=True,
         overwrite_from_index_token="overwrite_from_index_token",
+        build_tags=["extra-tag-1", "extra-tag-2"],
     )
     fixture_iib_client.assert_called_once_with(
         "iib-server", auth=fixture_iib_krb_auth.return_value, ssl_verify=False
@@ -271,6 +279,7 @@ def remove_operators_mock_calls_tester_not_called(
         binary_image="binary-image",
         overwrite_from_index=True,
         overwrite_from_index_token="overwrite_from_index_token",
+        build_tags=["extra-tag-1", "extra-tag-2"],
     )
     fixture_pulplib_repo_sync.assert_not_called()
     fixture_pulplib_repo_publish.assert_not_called()
@@ -292,6 +301,7 @@ def remove_operators_mock_calls_tester(
         binary_image="binary-image",
         overwrite_from_index=True,
         overwrite_from_index_token="overwrite_from_index_token",
+        build_tags=["extra-tag-1", "extra-tag-2"],
     )
     fixture_pulplib_repo_sync.assert_called_once()
     assert fixture_pulplib_repo_sync.mock_calls[0].args[0].feed == "https://feed.com"
@@ -451,6 +461,7 @@ def test_add_bundles_py(
         binary_image="binary-image",
         overwrite_from_index=True,
         overwrite_from_index_token="overwrite_from_index_token",
+        build_tags=["extra-tag-1", "extra-tag-2"],
     )
     fixture_pulplib_repo_sync.assert_called_once()
     assert fixture_pulplib_repo_sync.mock_calls[0].args[0].feed == "https://feed.com"
@@ -508,6 +519,7 @@ def test_add_bundles_py_multiple_bundles(
         binary_image="binary-image",
         overwrite_from_index=True,
         overwrite_from_index_token="overwrite_from_index_token",
+        build_tags=["extra-tag-1", "extra-tag-2"],
     )
     fixture_pulplib_repo_sync.assert_called_once()
     assert fixture_pulplib_repo_sync.mock_calls[0].args[0].feed == "https://feed.com"
diff --git a/tests/utils.py b/tests/utils.py
index 699bb69..a7a0324 100644
--- a/tests/utils.py
+++ b/tests/utils.py
@@ -22,6 +22,7 @@ def setup_task(
         state_seq=("in_progress", "finished"),
         op_type="add",
         deprecation_list=None,
+        build_tags=None,
     ):
         tid = self._gen_task_id()
         self.task_state_seq[tid] = list(state_seq)
diff --git a/tox.ini b/tox.ini
index 8d90c48..96d2aa9 100644
--- a/tox.ini
+++ b/tox.ini
@@ -27,6 +27,7 @@ exclude=.svn,CVS,.bzr,.hg,.git,__pycache__,.tox,setup.py,docs
 [testenv:py27]
 deps=
     {[py]deps}
+    -c legacy.constraints
 basepython = python2.7
 commands = python -m pytest -v --cov=pubtools --cov-report=html