Remove apt-ostree component

If some Debian package is corrupted inside apt-ostree repo, it can
not be deleted by name.
To fix it this commit adds the option to remove the component with
all packages inside it.

Test-Plan:
PASS: run 'sudo apt-ostree repo remove --feed=<pkgs_feed> \
      --release=bullseye --component=<component>' to remove the
      component
PASS: see in the logs 'Component removed successfully'
PASS: Check in <pkgs_feed>/conf/distributions if the component is
      not there.

Story: 2010676
Task: 51067

Change-Id: I77ae8047a757ead1f96f72b0935dea878a9bc434
Signed-off-by: Lindley Vieira <lindley.vieira@windriver.com>

apt_ostree/cmd/options.py

@@ -249,7 +249,7 @@ def packages_option(f):
         "packages",
         nargs=-1,
         callback=callback,
-        required=True,
+        required=False,
     )(f)
 
 

apt_ostree/repo.py

@@ -119,21 +119,35 @@ class Repo:
             self.console.print(table)
 
     def remove(self):
-        """Remove a Debian package from a component."""
+        """Remove Debian packages or a component."""
+
         component = self.state.component or self.state.origin
 
-        for pkg in self.state.packages:
-            self.logging.info(f"Removing {pkg}.")
-            r = utils.run_command(
-                ["reprepro", "-b", str(self.repo), "-C", component,
-                 "remove", self.state.release, pkg],
-                check=True)
-            if r.returncode == 0:
-                self.logging.info(
-                    f"Successfully removed {pkg} from component {component}\n")
+        if self.state.packages:
+            # delete package by package
+            for pkg in self.state.packages:
+                self.logging.info(f"Removing {pkg}.")
+                r = utils.run_command(
+                    ["reprepro", "-b", str(self.repo), "-C", component,
+                     "remove", self.state.release, pkg],
+                    check=True)
+                if r.returncode == 0:
+                    self.logging.info(
+                        f"Removed {pkg} from component {component}\n")
+                else:
+                    self.logging.error(
+                        f"Failed to remove {pkg} from component {component}\n")
+        else:
+            # delete the entire component
+            config = self.repo.joinpath("conf/distributions")
+
+            if utils.remove_component_from_config(config, component):
+                utils.run_command(
+                    ["reprepro", "-b", str(self.repo), "clearvanished"],
+                    check=True)
+                self.logging.info(f"Removed component {component}\n")
             else:
-                self.logging.error(
-                    f"Failed to remove {pkg} from component {component}\n")
+                self.logging.error(f"Failed to remove component {component}\n")
 
     def disable_repo(self):
         """Disable Debian feed via apt-add-repository."""

apt_ostree/utils.py

@@ -100,3 +100,39 @@ def check_and_append_component(config_path, component):
 
     with open(config_path, 'w') as file:
         file.writelines(lines)
+
+
+def remove_component_from_config(config_path, component):
+    try:
+        with open(config_path, 'r') as file:
+            lines = file.readlines()
+    except FileNotFoundError:
+        msg = "The file %s does not exist." % config_path
+        LOG.error(msg)
+        return False
+
+    updated_lines = []
+    component_found = False
+    for line in lines:
+        if line.startswith("Components:"):
+            components = line.split()[1:]
+            if component in components:
+                components.remove(component)
+                component_found = True
+
+                updated_line = "Components: " + " ".join(components) + "\n"
+                updated_lines.append(updated_line)
+        else:
+            updated_lines.append(line)
+
+    if not component_found:
+        msg = "Component %s not found in the configuration." % component
+        LOG.error(msg)
+        return False
+
+    with open(config_path, 'w') as file:
+        file.writelines(updated_lines)
+
+    LOG.info("Component %s removed from %s successfully"
+             % (component, config_path))
+    return True