Add Snyk scan suggestion when building

Signed-off-by: Ulysses Souza <[email protected]>

compose/cli/scan_suggest.py

@@ -0,0 +1,59 @@
+import json
+import logging
+import os
+from distutils.util import strtobool
+
+from docker.constants import IS_WINDOWS_PLATFORM
+from docker.utils.config import find_config_file
+
+
+SCAN_BINARY_NAME = "docker-scan" + (".exe" if IS_WINDOWS_PLATFORM else "")
+
+log = logging.getLogger(__name__)
+
+
+class ScanConfig:
+    def __init__(self, dict):
+        self.optin = False
+        vars(self).update(dict)
+
+
+def display_scan_suggest_msg():
+    if environment_scan_avoid_suggest() or \
+            scan_already_invoked() or \
+            not scan_available():
+        return
+    log.info("Use 'docker scan' to run Snyk tests against images to find vulnerabilities "
+             "and learn how to fix them")
+
+
+def environment_scan_avoid_suggest():
+    return os.getenv('DOCKER_SCAN_SUGGEST', 'true').lower() == 'false'
+
+
+def scan_already_invoked():
+    docker_folder = docker_config_folder()
+    if docker_folder is None:
+        return False
+
+    scan_config_file = os.path.join(docker_folder, 'scan', "config.json")
+    if not os.path.exists(scan_config_file):
+        return False
+
+    data = ''
+    with open(scan_config_file) as f:
+        data = f.read()
+    scan_config = json.loads(data, object_hook=ScanConfig)
+    return scan_config.optin if isinstance(scan_config.optin, bool) else strtobool(scan_config.optin)
+
+
+def scan_available():
+    docker_folder = docker_config_folder()
+    scan_config_file = os.path.join(docker_folder, 'cli-plugins', SCAN_BINARY_NAME)
+    return os.path.isfile(scan_config_file) or os.path.islink(scan_config_file)
+
+
+def docker_config_folder():
+    docker_config_file = find_config_file()
+    return None if not docker_config_file \
+        else os.path.dirname(os.path.abspath(docker_config_file))

compose/project.py

@@ -13,6 +13,7 @@
 
 from . import parallel
 from .cli.errors import UserError
+from .cli.scan_suggest import display_scan_suggest_msg
 from .config import ConfigurationError
 from .config.config import V1
 from .config.sort_services import get_container_name_from_network_mode
@@ -518,6 +519,9 @@ def build_service(service):
             for service in services:
                 build_service(service)
 
+        if services:
+            display_scan_suggest_msg()
+
     def create(
         self,
         service_names=None,
@@ -660,8 +664,15 @@ def up(self,
             service_names,
             include_deps=start_deps)
 
+        must_build = False
         for svc in services:
+            if svc.must_build(do_build=do_build):
+                must_build = True
             svc.ensure_image_exists(do_build=do_build, silent=silent, cli=cli)
+
+        if must_build:
+            display_scan_suggest_msg()
+
         plans = self._get_convergence_plans(
             services,
             strategy,

compose/service.py

@@ -366,6 +366,24 @@ def ensure_image_exists(self, do_build=BuildAction.none, silent=False, cli=False
             "rebuild this image you must use `docker-compose build` or "
             "`docker-compose up --build`.".format(self.name))
 
+    def must_build(self, do_build=BuildAction.none):
+        if self.can_be_built() and do_build == BuildAction.force:
+            return True
+
+        try:
+            self.image()
+            return False
+        except NoSuchImageError:
+            pass
+
+        if not self.can_be_built():
+            return False
+
+        if do_build == BuildAction.skip:
+            return False
+
+        return True
+
     def get_image_registry_data(self):
         try:
             return self.client.inspect_distribution(self.image_name)