Apply bugfix source help (#46)

* Update help strings

* Update with correct source helpstring, and examples

* Update changelog

Author: paulo-cisco

CHANGELOG.md

@@ -5,6 +5,10 @@
 
 The v1 release supports Cisco IOS-XR release versions 7.7.1 and above.
 
+### v1.1.20 (2025-05-09)
+
+- Updated help for apply-bugfixes
+
 ### v1.1.19 (2025-04-22)
 
 - Added Dockerfile.host-check to the release tarball

scripts/apply-bugfixes

@@ -28,11 +28,21 @@ Create a new XRd image with bugfixes installed on top of a base image.
 
 Required arguments:
   IMAGE            Loaded container image to install bugfixes on top of
-  SOURCE           Bugfix source to install from
+  SOURCE           Path to source to install packages from - a directory
+                   or tarball containing the rpm(s) to install.
 
 Optional arguments:
-  --new-packages   Install new packages if included in the bugfix source
-  ...              Args passed through to 'docker build'
+  --new-packages   Install new packages if included in the bugfix source. By
+                   default, only packages that are already installed in the
+                   base image will be updated, so this should be passed if
+                   any new packages are present in SOURCE.
+  ...              Additional args passed through to 'docker build' (such as
+                   --tag).
+
+Example invocations:
+  $(basename "$0") ios-xr/xrd-vrouter:25.1.1 /path/to/bugfixes.tar.gz --tag bugfix
+  $(basename "$0") ios-xr/xrd-vrouter:25.1.1 /path/to/rpm-dir/ --tag bugfix
+
 "
 }