dockerfile - if - 根据不同环境变量执行不同命令

IF 语法

RUN if [条件] ; then 命令 ; [else 命令 ;] fi

dockerfile

FROM nginx
ARG GIT_BRANCH="develop"
RUN if [ "$GIT_BRANCH" = "develop" ] ; then echo 'develop' ; fi
RUN if [ "$GIT_BRANCH" = "develop" ] ; then echo 'develop' ; else echo 'unknown'; fi

示例

RUN if [ "$GIT_BRANCH" = "develop" ]; then \
    echo "yarn build:dev" \
    yarn build:dev; \
  else \
    echo "yarn build" \
    yarn build; \
  fi