``` mkdir -p $GO_PROJECT_FOLDER && git clone #{gita} $GO_PROJECT_FOLDER && cd $GO_PROJECT_FOLDER if [[ -n $branch && -z $tag ]] then echo "branch is $branch and tag is $tag" echo "start branch..." git fetch git checkout $branch git pull touch .buildinfo git rev-parse HEAD >> .buildinfo git rev-parse --abbrev-ref HEAD >> .buildinfo git branch -a echo "print git info:" cat .buildinfo if [[ $? -ne 0 ]] then echo "git checkout version error" exit 250 fi ``` ``` elif [[ -n $tag && -z $branch ]] then echo "branch is $branch and tag is $tag" echo "starting tag" git fetch git checkout $tag touch .buildinfo git rev-parse HEAD >> .buildinfo git rev-parse --abbrev-ref HEAD >> .buildinfo git branch -a echo "print git info:" cat .buildinfo echo "checkout done" if [[ $? -ne 0 ]] then echo "git checkout version error" exit 250 fi else echo "git checkout version error" exit 250 fi ```