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https://github.com/NixOS/nixpkgs.git
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ci: Add review request scripts
Also post a comment in case base branch is wrong This guides newcomers in how to smoothly handle the potentially scary situation of having thousands of commits listed in a PR. While CI shows the same, people might not even look at CI if the PR looks botched.
This commit is contained in:
Silvan Mosberger
parent
1700d00588
commit
369cfa02da
@ -24,4 +24,5 @@ let
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in
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{
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inherit pkgs;
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requestReviews = pkgs.callPackage ./request-reviews { };
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}
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43
ci/request-reviews/default.nix
Normal file
43
ci/request-reviews/default.nix
Normal file
@ -0,0 +1,43 @@
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{
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lib,
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stdenvNoCC,
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makeWrapper,
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coreutils,
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codeowners,
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jq,
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curl,
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github-cli,
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gitMinimal,
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}:
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stdenvNoCC.mkDerivation {
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name = "request-reviews";
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src = lib.fileset.toSource {
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root = ./.;
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fileset = lib.fileset.unions [
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./get-reviewers.sh
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./request-reviews.sh
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./verify-base-branch.sh
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./dev-branches.txt
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];
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};
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nativeBuildInputs = [ makeWrapper ];
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dontBuild = true;
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installPhase = ''
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mkdir -p $out/bin
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mv dev-branches.txt $out/bin
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for bin in *.sh; do
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mv "$bin" "$out/bin"
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wrapProgram "$out/bin/$bin" \
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--set PATH ${
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lib.makeBinPath [
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coreutils
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codeowners
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jq
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curl
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github-cli
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gitMinimal
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]
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}
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done
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'';
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}
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7
ci/request-reviews/dev-branches.txt
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7
ci/request-reviews/dev-branches.txt
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@ -0,0 +1,7 @@
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# Trusted development branches:
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# These generally require PRs to update and are built by Hydra.
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master
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staging
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release-*
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staging-*
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haskell-updates
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87
ci/request-reviews/get-reviewers.sh
Executable file
87
ci/request-reviews/get-reviewers.sh
Executable file
@ -0,0 +1,87 @@
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#!/usr/bin/env bash
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# Get the code owners of the files changed by a PR,
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# suitable to be consumed by the API endpoint to request reviews:
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# https://docs.github.com/en/rest/pulls/review-requests?apiVersion=2022-11-28#request-reviewers-for-a-pull-request
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set -euo pipefail
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log() {
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echo "$@" >&2
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}
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if (( "$#" < 5 )); then
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log "Usage: $0 GIT_REPO BASE_REF HEAD_REF OWNERS_FILE PR_AUTHOR"
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exit 1
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fi
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gitRepo=$1
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baseRef=$2
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headRef=$3
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ownersFile=$4
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prAuthor=$5
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tmp=$(mktemp -d)
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trap 'rm -rf "$tmp"' exit
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git -C "$gitRepo" diff --name-only --merge-base "$baseRef" "$headRef" > "$tmp/touched-files"
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readarray -t touchedFiles < "$tmp/touched-files"
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log "This PR touches ${#touchedFiles[@]} files"
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# Get the owners file from the base, because we don't want to allow PRs to
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# remove code owners to avoid pinging them
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git -C "$gitRepo" show "$baseRef":"$ownersFile" > "$tmp"/codeowners
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# Associative arrays with the team/user as the key for easy deduplication
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declare -A teams users
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for file in "${touchedFiles[@]}"; do
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result=$(codeowners --file "$tmp"/codeowners "$file")
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read -r file owners <<< "$result"
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if [[ "$owners" == "(unowned)" ]]; then
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log "File $file is unowned"
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continue
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fi
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log "File $file is owned by $owners"
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# Split up multiple owners, separated by arbitrary amounts of spaces
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IFS=" " read -r -a entries <<< "$owners"
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for entry in "${entries[@]}"; do
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# GitHub technically also supports Emails as code owners,
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# but we can't easily support that, so let's not
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if [[ ! "$entry" =~ @(.*) ]]; then
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warn -e "\e[33mCodeowner \"$entry\" for file $file is not valid: Must start with \"@\"\e[0m" >&2
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# Don't fail, because the PR for which this script runs can't fix it,
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# it has to be fixed in the base branch
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continue
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fi
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# The first regex match is everything after the @
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entry=${BASH_REMATCH[1]}
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if [[ "$entry" =~ .*/(.*) ]]; then
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# Teams look like $org/$team, where we only need $team for the API
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# call to request reviews from teams
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teams[${BASH_REMATCH[1]}]=
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else
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# Everything else is a user
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users[$entry]=
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fi
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done
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done
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# Cannot request a review from the author
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if [[ -v users[$prAuthor] ]]; then
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log "One or more files are owned by the PR author, ignoring"
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unset 'users[$prAuthor]'
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fi
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# Turn it into a JSON for the GitHub API call to request PR reviewers
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jq -n \
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--arg users "${!users[*]}" \
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--arg teams "${!teams[*]}" \
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'{
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reviewers: $users | split(" "),
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team_reviewers: $teams | split(" ")
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}'
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97
ci/request-reviews/request-reviews.sh
Executable file
97
ci/request-reviews/request-reviews.sh
Executable file
@ -0,0 +1,97 @@
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#!/usr/bin/env bash
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# Requests reviews for a PR after verifying that the base branch is correct
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set -euo pipefail
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tmp=$(mktemp -d)
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trap 'rm -rf "$tmp"' exit
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SCRIPT_DIR=$(dirname "$0")
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log() {
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echo "$@" >&2
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}
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effect() {
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if [[ -n "${DRY_MODE:-}" ]]; then
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log "Skipping in dry mode:" "${@@Q}"
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else
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"$@"
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fi
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}
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if (( $# < 3 )); then
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log "Usage: $0 GITHUB_REPO PR_NUMBER OWNERS_FILE"
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exit 1
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fi
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baseRepo=$1
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prNumber=$2
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ownersFile=$3
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log "Fetching PR info"
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prInfo=$(gh api \
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-H "Accept: application/vnd.github+json" \
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-H "X-GitHub-Api-Version: 2022-11-28" \
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"/repos/$baseRepo/pulls/$prNumber")
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baseBranch=$(jq -r .base.ref <<< "$prInfo")
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log "Base branch: $baseBranch"
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prRepo=$(jq -r .head.repo.full_name <<< "$prInfo")
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log "PR repo: $prRepo"
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prBranch=$(jq -r .head.ref <<< "$prInfo")
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log "PR branch: $prBranch"
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prAuthor=$(jq -r .user.login <<< "$prInfo")
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log "PR author: $prAuthor"
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extraArgs=()
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if pwdRepo=$(git rev-parse --show-toplevel 2>/dev/null); then
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# Speedup for local runs
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extraArgs+=(--reference-if-able "$pwdRepo")
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fi
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log "Fetching Nixpkgs commit history"
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# We only need the commit history, not the contents, so we can do a tree-less clone using tree:0
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# https://github.blog/open-source/git/get-up-to-speed-with-partial-clone-and-shallow-clone/#user-content-quick-summary
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git clone --bare --filter=tree:0 --no-tags --origin upstream "${extraArgs[@]}" https://github.com/"$baseRepo".git "$tmp"/nixpkgs.git
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log "Fetching the PR commit history"
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# Fetch the PR
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git -C "$tmp/nixpkgs.git" remote add fork https://github.com/"$prRepo".git
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# This remote config is the same as --filter=tree:0 when cloning
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git -C "$tmp/nixpkgs.git" config remote.fork.partialclonefilter tree:0
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git -C "$tmp/nixpkgs.git" config remote.fork.promisor true
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# This should not conflict with any refs in Nixpkgs
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headRef=refs/remotes/fork/pr
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# Only fetch into a remote ref, because the local ref namespace is used by Nixpkgs, don't want any conflicts
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git -C "$tmp/nixpkgs.git" fetch --no-tags fork "$prBranch":"$headRef"
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log "Checking correctness of the base branch"
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if ! "$SCRIPT_DIR"/verify-base-branch.sh "$tmp/nixpkgs.git" "$headRef" "$baseRepo" "$baseBranch" "$prRepo" "$prBranch" | tee "$tmp/invalid-base-error" >&2; then
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log "Posting error as comment"
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if ! response=$(effect gh api \
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--method POST \
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-H "Accept: application/vnd.github+json" \
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-H "X-GitHub-Api-Version: 2022-11-28" \
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"/repos/$baseRepo/issues/$prNumber/comments" \
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-F "body=@$tmp/invalid-base-error"); then
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log "Failed to post the comment: $response"
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fi
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exit 1
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fi
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log "Getting code owners to request reviews from"
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"$SCRIPT_DIR"/get-reviewers.sh "$tmp/nixpkgs.git" "$baseBranch" "$headRef" "$ownersFile" "$prAuthor" > "$tmp/reviewers.json"
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log "Requesting reviews from: $(<"$tmp/reviewers.json")"
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if ! response=$(effect gh api \
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--method POST \
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-H "Accept: application/vnd.github+json" \
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-H "X-GitHub-Api-Version: 2022-11-28" \
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"/repos/$baseRepo/pulls/$prNumber/requested_reviewers" \
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--input "$tmp/reviewers.json"); then
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log "Failed to request reviews: $response"
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exit 1
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fi
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log "Successfully requested reviews"
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103
ci/request-reviews/verify-base-branch.sh
Executable file
103
ci/request-reviews/verify-base-branch.sh
Executable file
@ -0,0 +1,103 @@
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#!/usr/bin/env bash
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# Check that a PR doesn't include commits from other development branches.
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# Fails with next steps if it does
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set -euo pipefail
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tmp=$(mktemp -d)
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trap 'rm -rf "$tmp"' exit
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SCRIPT_DIR=$(dirname "$0")
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log() {
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echo "$@" >&2
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}
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# Small helper to check whether an element is in a list
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# Usage: `elementIn foo "${list[@]}"`
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elementIn() {
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local e match=$1
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shift
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for e; do
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if [[ "$e" == "$match" ]]; then
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return 0
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fi
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done
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return 1
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}
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if (( $# < 6 )); then
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log "Usage: $0 LOCAL_REPO HEAD_REF BASE_REPO BASE_BRANCH PR_REPO PR_BRANCH"
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exit 1
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fi
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localRepo=$1
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headRef=$2
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baseRepo=$3
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baseBranch=$4
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prRepo=$5
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prBranch=$6
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# All development branches
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devBranchPatterns=()
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while read -r pattern; do
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if [[ "$pattern" != '#'* ]]; then
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devBranchPatterns+=("$pattern")
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fi
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done < "$SCRIPT_DIR/dev-branches.txt"
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git -C "$localRepo" branch --list --format "%(refname:short)" "${devBranchPatterns[@]}" > "$tmp/dev-branches"
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readarray -t devBranches < "$tmp/dev-branches"
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if [[ "$baseRepo" == "$prRepo" ]] && elementIn "$prBranch" "${devBranches[@]}"; then
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log "This PR merges $prBranch into $baseBranch, no commit check necessary"
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exit 0
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fi
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# The current merge base of the PR
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prMergeBase=$(git -C "$localRepo" merge-base "$baseBranch" "$headRef")
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log "The PR's merge base with the base branch $baseBranch is $prMergeBase"
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# This is purely for debugging
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git -C "$localRepo" rev-list --reverse "$baseBranch".."$headRef" > "$tmp/pr-commits"
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log "The PR includes these $(wc -l < "$tmp/pr-commits") commits:"
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cat <"$tmp/pr-commits" >&2
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for testBranch in "${devBranches[@]}"; do
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if [[ -z "$(git -C "$localRepo" rev-list -1 --since="1 month ago" "$testBranch")" ]]; then
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log "Not checking $testBranch, was inactive for the last month"
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continue
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fi
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log "Checking if commits from $testBranch are included in the PR"
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# We need to check for any commits that are in the PR which are also in the test branch.
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# We could check each commit from the PR individually, but that's unnecessarily slow.
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#
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# This does _almost_ what we want: `git rev-list --count headRef testBranch ^baseBranch`,
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# except that it includes commits that are reachable from _either_ headRef or testBranch,
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# instead of restricting it to ones reachable by both
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# Easily fixable though, because we can use `git merge-base testBranch headRef`
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# to get the least common ancestor (aka merge base) commit reachable by both.
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# If the branch being tested is indeed the right base branch,
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# this is then also the commit from that branch that the PR is based on top of.
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testMergeBase=$(git -C "$localRepo" merge-base "$testBranch" "$headRef")
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# And then use the `git rev-list --count`, but replacing the non-working
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# `headRef testBranch` with the merge base of the two.
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extraCommits=$(git -C "$localRepo" rev-list --count "$testMergeBase" ^"$baseBranch")
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if (( extraCommits != 0 )); then
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log -e "\e[33m"
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echo "The PR's base branch is set to $baseBranch, but $extraCommits commits from the $testBranch branch are included. Make sure you know the [right base branch for your changes](https://github.com/NixOS/nixpkgs/blob/master/CONTRIBUTING.md#branch-conventions), then:"
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echo "- If the changes should go to the $testBranch branch, [change the base branch](https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/proposing-changes-to-your-work-with-pull-requests/changing-the-base-branch-of-a-pull-request) to $testBranch"
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echo "- If the changes should go to the $baseBranch branch, rebase your PR onto the merge base with the $testBranch branch:"
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echo " \`\`\`"
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echo " git rebase --onto $prMergeBase $testMergeBase"
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echo " git push --force-with-lease"
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echo " \`\`\`"
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log -e "\e[m"
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exit 1
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fi
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done
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log "Base branch is correct, no commits from development branches are included"
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