feat(golang): convert to v2 tool

src/usr/local/buildpack/tools/v2/golang.sh

@@ -0,0 +1,55 @@
+#!/bin/bash
+
+
+function prepare_tool() {
+
+  # go suggests: git svn bzr mercurial
+  apt_install bzr mercurial
+
+  export_env GOPATH "/go"
+  export_env CGO_ENABLED 0
+  export_env GOSUMDB off
+  export_path "\$GOPATH/bin"
+
+  mkdir -p "$GOPATH/src" "$GOPATH/bin" "$GOPATH/pkg"
+
+  chown -R "${USER_ID}" "$GOPATH"
+  chmod -R g+w "$GOPATH"
+  create_tool_path
+}
+
+function install_tool () {
+  local versioned_tool_path
+  local file
+  local ARCH
+  local GOLANG_FILE_VERSION
+
+  if [[ ! -d "$(find_tool_path)" ]]; then
+    if [[ $(is_root) -ne 0 ]]; then
+      echo "${TOOL_NAME} not prepared"
+      exit 1
+    fi
+    prepare_tool
+  fi
+
+  versioned_tool_path=$(create_versioned_tool_path)
+  ARCH=linux-amd64
+  # fix version
+  GOLANG_FILE_VERSION=${TOOL_VERSION}
+  if [[ "${PATCH}" == "0" ]]; then
+    GOLANG_FILE_VERSION="${MAJOR}.${MINOR}"
+  fi
+
+  file=$(get_from_url "https://dl.google.com/go/go${GOLANG_FILE_VERSION}.${ARCH}.tar.gz")
+  tar --strip 1 -C "${versioned_tool_path}" -xf "${file}"
+}
+
+function link_tool () {
+  local versioned_tool_path
+  versioned_tool_path=$(find_versioned_tool_path)
+
+  shell_wrapper go "${versioned_tool_path}/bin"
+
+  go version
+  go env
+}

test/golang/Dockerfile

@@ -1,4 +1,7 @@
 ARG IMAGE=containerbase/buildpack
+ARG APT_HTTP_PROXY
+ARG BUILDPACK_DEBUG
+
 FROM ${IMAGE} as build
 
 
@@ -13,6 +16,9 @@ WORKDIR /test
 #--------------------------------------
 FROM build as testa
 
+ARG APT_HTTP_PROXY
+ARG BUILDPACK_DEBUG
+
 # renovate: datasource=docker versioning=docker
 RUN install-tool golang 1.19.0
 
@@ -39,6 +45,9 @@ RUN set -ex; cd c; go get -d ./...; cat go.sum
 #--------------------------------------
 FROM build as testb
 
+ARG APT_HTTP_PROXY
+ARG BUILDPACK_DEBUG
+
 # do not update patch version
 RUN install-tool golang 1.11.0
 
@@ -52,10 +61,36 @@ USER 1000
 SHELL [ "/bin/sh", "-c" ]
 RUN go env
 
+#--------------------------------------
+# test: golang (non-root)
+#--------------------------------------
+FROM build as testc
+
+ARG APT_HTTP_PROXY
+ARG BUILDPACK_DEBUG
+
+RUN prepare-tool golang
+
+USER 1000
+
+# renovate: datasource=docker versioning=docker
+RUN install-tool golang 1.19.0
+
+
+RUN set -ex; cd a; go get -d ./...; cat go.sum; go mod tidy; cat go.sum
+
+RUN set -ex; cd b; cat go.sum; go mod tidy; cat go.sum
+
+RUN set -ex; \
+  cd d; \
+  go get -d ./...; \
+  go mod tidy;
+
 #--------------------------------------
 # final
 #--------------------------------------
 FROM build
 
 COPY --from=testa /.dummy /.dummy
 COPY --from=testb /.dummy /.dummy
+COPY --from=testc /.dummy /.dummy