frontend: add command for managing warning banner

frontend/coprs_frontend/commands/warning_banner.py

@@ -0,0 +1,51 @@
+"""
+Command for managing warning banner on the top of frontend page.
+"""
+
+
+import os
+import sys
+from pathlib import Path
+
+import click
+from jinja2 import Template
+
+from coprs.constants import BANNER_LOCATION
+
+
+@click.command()
+@click.option("--outage_time", "-o", default=None, help="start time of the outage")
+@click.option("--ticket", "-t", default=None, help="fedora infra ticket ID")
+@click.option("--rest", default=None, help="additional code")
+@click.option("--remove", is_flag=True, show_default=True, default=False, help="removes banner")
+def warning_banner(outage_time, ticket, rest, remove):
+    """
+    Adds a banner to Copr's frontend page with outage warning. `outage_time` or `rest` is required.
+
+     In case you need to schedule regular outage, fill in only `outage_time` and `ticket`. In case
+    you need to add something else, please use the `rest` parameter to dump to warning banner
+    some additional information. This can be just some text or html code.
+     `rest` parameter can be used as a standalone option just for showing some warning banner
+    with specific information. It can be also piece of HTML code.
+    """
+    if remove:
+        if outage_time or ticket or rest:
+            print(
+                "Error: can't remove banner with `outage_time` or `ticket` or `rest`",
+                file=sys.stderr,
+            )
+            return
+
+        if os.path.exists(BANNER_LOCATION):
+            os.remove(BANNER_LOCATION)
+            return
+
+    if outage_time is None and rest is None:
+        print("Error: `outage_time` or `rest` should be present.", file=sys.stderr)
+        return
+
+    with open(BANNER_LOCATION, "w", encoding="UTF-8") as banner:
+        banner_path_template = Path(__file__).parent / "../coprs/templates/banner-include.html"
+        with banner_path_template.open() as banner_template:
+            template = Template(banner_template.read())
+            banner.write(template.render(outage_time=outage_time, ticket=ticket, rest=rest))

frontend/coprs_frontend/coprs/constants.py

@@ -0,0 +1,6 @@
+"""
+File which contains only constants. Nothing else.
+"""
+
+
+BANNER_LOCATION = "/var/lib/copr/data/banner-include.html"

frontend/coprs_frontend/coprs/context_processors.py

@@ -2,12 +2,10 @@
 import flask
 
 from coprs import app
+from coprs.constants import BANNER_LOCATION
 from coprs.helpers import current_url
 
 
-BANNER_LOCATION = "/var/lib/copr/banner-include.html"
-
-
 @app.context_processor
 def include_banner():
     if os.path.exists(BANNER_LOCATION):

frontend/coprs_frontend/coprs/templates/banner-include.html

@@ -0,0 +1,16 @@
+<div class="alert alert-danger" role="alert">
+    {% if outage_time %}
+        <b>Warning!</b> Scheduled outage of Copr servers - {{ outage_time }}.
+    {% endif %}
+    {% if ticket %}
+        For more information please refer to
+        <a href="https://pagure.io/fedora-infrastructure/issue/{{ ticket }}">this ticket</a>.
+    {% endif %}
+    <!--
+    Possible rest of short html code. Something like:
+    "Check <a href="#" class="alert-link">this document</a> for details."
+    -->
+    {% if rest %}
+        {{ rest }}
+    {%  endif %}
+</div>

frontend/coprs_frontend/manage.py

@@ -40,6 +40,7 @@
 import commands.delete_orphans
 import commands.fixup_unnoticed_chroots
 import commands.chroots_template
+import commands.warning_banner
 
 from coprs import app
 
@@ -90,6 +91,7 @@
     "clean_old_builds",
     "delete_orphans",
     "delete_dirs",
+    "warning_banner",
 ]