util/mb/google/hatch: script can take optional bug parameter

When creating a new variant, adding a bug parameter after the name
of the variant will populate the BUG= field in the commit message.
If the parameter is not present, then BUG=None.

Signed-off-by: Paul Fagerburg <pfagerburg@chromium.org>
Change-Id: I3e08df5d80a5684c9f3675e3c0a8346240171cd3
Reviewed-on: https://review.coreboot.org/c/coreboot/+/35606
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Andrew McRae <amcrae@chromium.org>
Reviewed-by: Edward O'Callaghan <quasisec@chromium.org>

util/mainboard/google/hatch/create_coreboot_variant.sh

@@ -15,9 +15,9 @@
 
 export LC_ALL=C
 
-if [[ "$#" -ne 1 ]]; then
-  echo "Usage: $0 variant_name"
-  echo "e.g. $0 kohaku"
+if [[ "$#" -lt 1 ]]; then
+  echo "Usage: $0 variant_name [b:bug_number]"
+  echo "e.g. $0 kohaku b:140261109"
   echo "Adds a new variant of Hatch to Kconfig and Kconfig.name, creates the"
   echo "skeleton files for acpi, ec, and gpio, copies the makefile for"
   echo "SPD sources, and sets up a basic overridetree"
@@ -34,6 +34,10 @@ BASE="hatch"
 VARIANT="${1,,}"
 VARIANT_UPPER="${VARIANT^^}"
 
+# Assign text for the "BUG=" part of the commit, or use "None" if that
+# parameter wasn't specified.
+BUG=${2:-None}
+
 # This script and the templates live in util/mainboard/google/hatch
 # We need to create files in src/mainboard/google/hatch
 pushd "${BASH_SOURCE%/*}" || exit 1
@@ -71,7 +75,7 @@ git add Kconfig Kconfig.name
 # Now commit the files.
 git commit -sm "${BASE}: Create ${VARIANT} variant
 
-BUG=none
+BUG=${BUG}
 TEST=util/abuild/abuild -p none -t google/${BASE} -x -a
 make sure the build includes GOOGLE_${VARIANT_UPPER}"