action: add support for user-defined environment variables

action.yml

@@ -63,4 +63,5 @@ runs:
  INPUT_PASSWORD: ${{ inputs.password }}
  INPUT_DOCKER_NETWORK: ${{ inputs.docker_network }}
  INPUT_PLATFORM: ${{ inputs.platform }}
+ INPUT_ACTIONS_ENV: ${{ toJson(env) }}
  run: "$GITHUB_ACTION_PATH/entrypoint.sh"

entrypoint.sh

@@ -8,6 +8,10 @@ main() {
  local COLOR_RED="\e[0;31m"
  local COLOR_RESET="\e[0m"
 
+ declare -A env_vars=(
+ [HOME]=1 [CI]=1 [GITHUB_ACTIONS]=1 [GITHUB_WORKSPACE]=1 [GITHUB_EVENT_PATH]=1 [GITHUB_OUTPUT]=1
+ [GITHUB_ENV]=1 [GITHUB_STATE]=1 [GITHUB_STEP_SUMMARY]=1 [GITHUB_PATH]=1
+ )
  local script
  IFS=" " read -r -a argv <<< "$INPUT_OPTIONS"
  IFS=" " read -r -a run_args <<< "$INPUT_RUN_ARGS"
@@ -37,15 +41,40 @@ main() {
  argv+=(--platform "$INPUT_PLATFORM")
  fi
 
- # load all environment variables
- for prefix in GITHUB_ RUNNER_ ACTIONS_; do
- while IFS= read -r env; do
+ # add important environment variables that mustn't be overriden
+ argv+=(
+ -e "HOME=/github/home"
+ -e "CI=true"
+ -e "GITHUB_ACTIONS=true"
+ -e "GITHUB_WORKSPACE=/github/workspace"
+ -e "GITHUB_EVENT_PATH=${GITHUB_EVENT_PATH/#$RUNNER_TEMP//github/workflow}"
+ -e "GITHUB_OUTPUT=${GITHUB_OUTPUT/#$RUNNER_TEMP//github/file_commands}"
+ -e "GITHUB_ENV=${GITHUB_ENV/#$RUNNER_TEMP//github/file_commands}"
+ -e "GITHUB_STATE=${GITHUB_STATE/#$RUNNER_TEMP//github/file_commands}"
+ -e "GITHUB_STEP_SUMMARY=${GITHUB_STEP_SUMMARY/#$RUNNER_TEMP//github/file_commands}"
+ -e "GITHUB_PATH=${GITHUB_PATH/#$RUNNER_TEMP//github/file_commands}"
+ )
+
+ # load user set environment variables
+ while IFS= read -r env; do
+ # insert if it doesn't override important variables that can't be overriden
+ if ! [[ -v env_vars["$env"] ]]; then
  argv+=(-e "$env")
- done <<< "$(env | grep -o "^${prefix}[^=]*")"
- done
+ env_vars["$env"]=1
+ fi
+ done <<< "$(jq -r 'keys | .[]' <<< "$INPUT_ACTIONS_ENV")"
 
- # load extra environment variables
- argv+=(-e HOME -e CI=true -e GITHUB_ACTIONS=true)
+ # load GHA environment variables
+ while IFS= read -r env; do
+ # insert if it doesn't override important variables that can't be overriden
+ if [[ "$env" = GITHUB_* ]] \
+ || [[ "$env" = RUNNER_* ]] \
+ || [[ "$env" = ACTIONS_* ]] \
+ && ! [[ -v env_vars["$env"] ]]; then
+ argv+=(-e "$env")
+ env_vars["$env"]=1
+ fi
+ done <<< "$(env | grep -o "^[^=]*")"
 
  # add important volumes
  # some directories here are taken from action steps that uses docker:// protocols