diff --git a/README.md b/README.md index bc061aee..cc40f161 100644 --- a/README.md +++ b/README.md @@ -106,3 +106,57 @@ Kubernetes releases: CSI_PROW_KUBERNETES_VERSION=1.13.3 ./.prow.sh CSI_PROW_KUBERNETES_VERSION=latest ./.prow.sh + +Dependencies and vendoring +-------------------------- + +Most projects will (eventually) use `go mod` to manage +dependencies. `dep` is also still supported by `csi-release-tools`, +but not documented here because it's not recommended anymore. + +The usual instructions for using [go +modules](https://github.com/golang/go/wiki/Modules) apply. Here's a cheat sheet +for some of the relevant commands: +- list available updates: `GO111MODULE=on go list -u -m all` +- update or add a single dependency: `GO111MODULE=on go get ` +- update all dependencies to their next minor or patch release: + `GO111MODULE=on go get ./...` (add `-u=patch` to limit to patch + releases) +- lock onto a specific version: `GO111MODULE=on go get @` +- clean up `go.mod`: `GO111MODULE=on go mod tidy` +- update vendor directory: `GO111MODULE=on go mod vendor` + +`GO111MODULE=on` can be left out when using Go >= 1.13 or when the +source is checked out outside of `$GOPATH`. + +`go mod tidy` must be used to ensure that the listed dependencies are +really still needed. Changing import statements or a tentative `go +get` can result in stale dependencies. + +The `test-vendor` verifies that it was used when run locally or in a +pre-merge CI job. If a `vendor` directory is present, it will also +verify that it's content is up-to-date. + +The `vendor` directory is optional. It is still present in projects +because it avoids downloading sources during CI builds. If this is no +longer deemed necessary, then a project can also remove the directory. + +When using packages that are part of the Kubernetes source code, the +commands above are not enough because the [lack of semantic +versioning](https://github.com/kubernetes/kubernetes/issues/72638) +prevents `go mod` from finding newer releases. Importing directly from +`kubernetes/kubernetes` also needs `replace` statements to override +the fake `v0.0.0` versions +(https://github.com/kubernetes/kubernetes/issues/79384). The +`go-get-kubernetes.sh` script can be used to update all packages in +lockstep to a different Kubernetes version. It takes a single version +number like "1.16.0". + +Conversion of a repository that uses `dep` to `go mod` can be done with: + + GO111MODULE=on go mod init + release-tools/go-get-kubernetes.sh + GO111MODULE=on go mod tidy + GO111MODULE=on go mod vendor + git rm -f Gopkg.toml Gopkg.lock + git add go.mod go.sum vendor diff --git a/build.make b/build.make index 8d715e49..cbf6d455 100644 --- a/build.make +++ b/build.make @@ -130,6 +130,26 @@ test-fmt: # - the fabricated merge commit leaves go.mod, go.sum and vendor dir unchanged # - release-tools also didn't change (changing rules or Go version might lead to # a different result and thus must be tested) +# - import statements not changed (because if they change, go.mod might have to be updated) +# +# "git diff" is intelligent enough to annotate changes inside the "import" block in +# the start of the diff hunk: +# +# diff --git a/rpc/common.go b/rpc/common.go +# index bb4a5c4..5fa4271 100644 +# --- a/rpc/common.go +# +++ b/rpc/common.go +# @@ -21,7 +21,6 @@ import ( +# "fmt" +# "time" +# +# - "google.golang.org/grpc" +# "google.golang.org/grpc/codes" +# "google.golang.org/grpc/status" +# +# We rely on that to find such changes. +# +# Vendoring is optional when using go.mod. .PHONY: test-vendor test: test-vendor test-vendor: @@ -140,22 +160,37 @@ test-vendor: *v0.[56789]*) dep check && echo "vendor up-to-date" || false;; \ *) echo "skipping check, dep >= 0.5 required";; \ esac; \ - else \ - echo "Repo uses 'go mod' for vendoring."; \ + elif [ -f go.mod ]; then \ + echo "Repo uses 'go mod'."; \ if [ "$${JOB_NAME}" ] && \ ( [ "$${JOB_TYPE}" != "presubmit" ] || \ - [ $$(git diff "${PULL_BASE_SHA}..HEAD" -- go.mod go.sum vendor release-tools | wc -l) -eq 0 ] ); then \ - echo "Skipping vendor check because the Prow pre-submit job does not change vendoring."; \ - elif ! GO111MODULE=on go mod vendor; then \ + [ $$( (git diff "${PULL_BASE_SHA}..HEAD" -- go.mod go.sum vendor release-tools; \ + git diff "${PULL_BASE_SHA}..HEAD" | grep -e '^@@.*@@ import (' -e '^[+-]import') | \ + wc -l) -eq 0 ] ); then \ + echo "Skipping vendor check because the Prow pre-submit job does not affect dependencies."; \ + elif ! GO111MODULE=on go mod tidy; then \ echo "ERROR: vendor check failed."; \ false; \ - elif [ $$(git status --porcelain -- vendor | wc -l) -gt 0 ]; then \ - echo "ERROR: vendor directory *not* up-to-date, it did get modified by 'GO111MODULE=on go mod vendor':"; \ - git status -- vendor; \ - git diff -- vendor; \ + elif [ $$(git status --porcelain -- go.mod go.sum | wc -l) -gt 0 ]; then \ + echo "ERROR: go module files *not* up-to-date, they did get modified by 'GO111MODULE=on go mod tidy':"; \ + git diff -- go.mod go.sum; \ false; \ + elif [ -d vendor ]; then \ + if ! GO111MODULE=on go mod vendor; then \ + echo "ERROR: vendor check failed."; \ + false; \ + elif [ $$(git status --porcelain -- vendor | wc -l) -gt 0 ]; then \ + echo "ERROR: vendor directory *not* up-to-date, it did get modified by 'GO111MODULE=on go mod vendor':"; \ + git status -- vendor; \ + git diff -- vendor; \ + false; \ + else \ + echo "Go dependencies and vendor directory up-to-date."; \ + fi; \ + else \ + echo "Go dependencies up-to-date."; \ fi; \ - fi; + fi .PHONY: test-subtree test: test-subtree diff --git a/go-get-kubernetes.sh b/go-get-kubernetes.sh new file mode 100755 index 00000000..8c4e3024 --- /dev/null +++ b/go-get-kubernetes.sh @@ -0,0 +1,104 @@ +#!/usr/bin/env bash + +# Copyright 2019 The Kubernetes Authors. +# +# Licensed under the Apache License, Version 2.0 (the "License"); +# you may not use this file except in compliance with the License. +# You may obtain a copy of the License at +# +# http://www.apache.org/licenses/LICENSE-2.0 +# +# Unless required by applicable law or agreed to in writing, software +# distributed under the License is distributed on an "AS IS" BASIS, +# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +# See the License for the specific language governing permissions and +# limitations under the License. +# +# This script can be used while converting a repo from "dep" to "go mod" +# by calling it after "go mod init" or to update the Kubernetes packages +# in a repo that has already been converted. Only packages that are +# part of kubernetes/kubernetes and thus part of a Kubernetes release +# are modified. Other k8.io packages (like k8s.io/klog, k8s.io/utils) +# need to be updated separately. + +set -o pipefail + +cmd=$0 + +function help () { + echo "$cmd - update all components from kubernetes/kubernetes to that version" +} + +if [ $# -ne 1 ]; then + help + exit 1 +fi +case "$1" in -h|--help|help) help; exit 0;; esac + +die () { + echo >&2 "$@" + exit 1 +} + +k8s="$1" + +# If the repo imports k8s.io/kubernetes (directly or indirectly), then +# "go mod" will try to find "v0.0.0" versions because +# k8s.io/kubernetes has those in it's go.mod file +# (https://github.com/kubernetes/kubernetes/blob/2bd9643cee5b3b3a5ecbd3af49d09018f0773c77/go.mod#L146-L157). +# (https://github.com/kubernetes/kubernetes/issues/79384). +# +# We need to replicate the replace statements to override those fake +# versions also in our go.mod file (idea and some code from +# https://github.com/kubernetes/kubernetes/issues/79384#issuecomment-521493597). +mods=$( (set -x; curl --silent --show-error --fail "https://raw.githubusercontent.com/kubernetes/kubernetes/v${k8s}/go.mod") | + sed -n 's|.*k8s.io/\(.*\) => ./staging/src/k8s.io/.*|k8s.io/\1|p' + ) || die "failed to determine Kubernetes staging modules" +for mod in $mods; do + # The presence of a potentially incomplete go.mod file affects this command, + # so move elsewhere. + modinfo=$(set -x; cd /; env GO111MODULE=on go mod download -json "$mod@kubernetes-${k8s}") || + die "failed to determine version of $mod: $modinfo" + v=$(echo "$modinfo" | sed -n 's|.*"Version": "\(.*\)".*|\1|p') + (set -x; env GO111MODULE=on go mod edit "-replace=$mod=$mod@$v") || die "'go mod edit' failed" +done + +packages= + +# Beware that we have to work with packages, not modules (i.e. no -m +# flag), because some modules trigger a "no Go code except tests" +# error. Getting their packages works. +if ! packages=$( (set -x; env GO111MODULE=on go list all) | grep ^k8s.io/ | sed -e 's; *;;'); then + cat >&2 <&2 <" go.mod; then + deps="$deps $(echo "$package" | sed -e "s;\$;@kubernetes-$k8s;" -e 's;^k8s.io/kubernetes\(/.*\)@kubernetes-;k8s.io/kubernetes\1@v;')" + fi +done + +# shellcheck disable=SC2086 +(set -x; env GO111MODULE=on go get $deps 2>&1) || die "go get failed" +echo "SUCCESS"