Add images printtag command

CHANGELOG.md

@@ -4,6 +4,7 @@ Note: Breaking changes between versions are indicated by "💥".
 
 ## Unreleased
 
+- [Feature] Add ``images printtag`` command
 - [Improvement] Make it possible to override individual contact email addresses with plugins
 - [Bugfix] Replace "no-reply@LMS_BASE" email address by regular contact email address
 - [Bugfix] Disable learner records globally by default

tutor/commands/images.py

@@ -20,7 +20,7 @@ def images_command():
     short_help="Build docker images",
     help="Build the docker images necessary for an Open edX platform.",
 )
-@click.argument("image", nargs=-1)
+@click.argument("image_names", metavar="image", nargs=-1)
 @click.option(
     "--no-cache", is_flag=True, help="Do not use cache when building the image"
 )
@@ -38,7 +38,7 @@ def images_command():
     help="Set a custom host-to-IP mapping (host:ip).",
 )
 @click.pass_obj
-def build(context, image, no_cache, build_args, add_hosts):
+def build(context, image_names, no_cache, build_args, add_hosts):
     config = tutor_config.load(context.root)
     command_args = []
     if no_cache:
@@ -47,26 +47,38 @@ def build(context, image, no_cache, build_args, add_hosts):
         command_args += ["--build-arg", build_arg]
     for add_host in add_hosts:
         command_args += ["--add-host", add_host]
-    for i in image:
-        build_image(context.root, config, i, *command_args)
+    for image in image_names:
+        build_image(context.root, config, image, *command_args)
 
 
 @click.command(short_help="Pull images from the Docker registry")
-@click.argument("image", nargs=-1)
+@click.argument("image_names", metavar="image", nargs=-1)
 @click.pass_obj
-def pull(context, image):
+def pull(context, image_names):
     config = tutor_config.load(context.root)
-    for i in image:
+    for image in image_names:
         pull_image(config, i)
 
 
 @click.command(short_help="Push images to the Docker registry")
-@click.argument("image", nargs=-1)
+@click.argument("image_names", metavar="image", nargs=-1)
 @click.pass_obj
-def push(context, image):
+def push(context, image_names):
     config = tutor_config.load(context.root)
-    for i in image:
-        push_image(config, i)
+    for image in image_names:
+        push_image(config, image)
+
+
+@click.command(short_help="Print tag associated to a Docker image")
+@click.argument("image_names", metavar="image", nargs=-1)
+@click.pass_obj
+def printtag(context, image_names):
+    config = tutor_config.load(context.root)
+    for image in image_names:
+        for _img, tag in iter_images(config, image, BASE_IMAGE_NAMES):
+            print(tag)
+        for _img, tag in iter_plugin_images(config, image, "build-image"):
+            print(tag)
 
 
 def build_image(root, config, image, *args):
@@ -139,3 +151,4 @@ def vendor_image_names(config):
 images_command.add_command(build)
 images_command.add_command(pull)
 images_command.add_command(push)
+images_command.add_command(printtag)