addon-has-changes-matrix.sh

#!/bin/bash
# assumptions
# - will run each changed addon as a separate testgrid run. Testing two addon updates simultaneously in a TestGrid run is not supported.

set -eo pipefail

function require() {
   if [ -z "$2" ]; then
       echo "validation failed: $1 unset"
       exit 1
   fi
}

function join_array_by {
  local d=${1-} f=${2-}
  if shift 2; then
    printf %s "$f" "${@/#/$d}"
  fi
}

function modified_versions() {
  local addon=$1

  # Get the version that's changed (filter out templates and build-images)
  local versions=
  versions=$(git diff --dirstat=files,0 "origin/${GITHUB_BASE_REF}" -- "addons/${addon}" "origin/${GITHUB_BASE_REF}" -- "addons/${addon}" | sed 's/^[ 0-9.]\+% addons\///g' | grep -v template | grep -v build-images | cut -f2 -d"/" | uniq |  sort -r )

  echo "$versions"
}

function check_addon() {
  local addon=$1

  # Get the version that's changed (filter out templates and build-images)
  local versions=
  versions=$(modified_versions "$addon")

  local prefix=
  prefix="pr-$(echo "$GITHUB_REF" | cut -d"/" -f3)-${GITHUB_SHA:0:7}"

  # check if there is a valid version (files in the root don't count) & template files
  for version in $versions
  do
    shopt -s nullglob
    if compgen -G "./addons/$addon/template/testgrid/*.yaml" > /dev/null; then
      ADDONS_AVAILBLE+=('{"addon":"'"$addon"'","version":"'"$version"'","prefix":"'"$prefix"'"}')

      echo "Found Modified Addon: $addon-$version"
    fi
    shopt -u nullglob
  done
}

# These addons aren't part of the spec. (containerd doesn't use addon.sh)
ADDON_DENY_LIST="aws calico nodeless"

# Checks if there is an update to a addon that meets all of the right criteria and reports to the action
# - Not an update to the template or build-images
# - Not an update to a readme
# - Not a addon in the ADDON_DENY_LIST (not part of the spec)
ADDONS_AVAILBLE=()
function main() {
  # Defaults from GH Action
  require GITHUB_BASE_REF "${GITHUB_BASE_REF}"
  require GITHUB_REF "${GITHUB_REF}"
  require GITHUB_SHA "${GITHUB_SHA}"

  PR_NUMBER="$(echo "$GITHUB_REF" | cut -d"/" -f3)"

  echo "Checking PR#${PR_NUMBER}..."

  # Take the base branch and figure out which addons changed. Verify each.
  for addon in $(git diff --dirstat=files,0 "origin/${GITHUB_BASE_REF}" -- addons/ "origin/${GITHUB_BASE_REF}" -- addons/ | sed 's/^[ 0-9.]\+% addons\///g' | grep -v template | grep -v build-images | cut -f -1 -d"/" | uniq )
  do
    if ! [[ " $ADDON_DENY_LIST " =~ .*\ $addon\ .* ]]; then
      check_addon "$addon"
    fi
  done

  if [ "${#ADDONS_AVAILBLE[@]}" -gt "0" ]; then
    echo "Modified addons detected. Continuing with action..."
    echo "addons={\"include\":[$(join_array_by ',' "${ADDONS_AVAILBLE[@]}")]}" >> "$GITHUB_OUTPUT"
  else
    echo "No changed addons detected, addon is currently in the ADDON_DENY_LIST, or addon does not have a TestGrid template."
  fi
}

main "$@"