ci/request-reviews/request-reviews.sh

   1 #!/usr/bin/env bash
   2
   3 # Requests reviews for a PR after verifying that the base branch is correct
   4
   5 set -euo pipefail
   6 tmp=$(mktemp -d)
   7 trap 'rm -rf "$tmp"' exit
   8 SCRIPT_DIR=$(dirname "$0")
   9
  10 log() {
  11     echo "$@" >&2
  12 }
  13
  14 effect() {
  15     if [[ -n "${DRY_MODE:-}" ]]; then
  16         log "Skipping in dry mode:" "${@@Q}"
  17     else
  18         "$@"
  19     fi
  20 }
  21
  22 if (( $# < 3 )); then
  23     log "Usage: $0 GITHUB_REPO PR_NUMBER OWNERS_FILE"
  24     exit 1
  25 fi
  26 baseRepo=$1
  27 prNumber=$2
  28 ownersFile=$3
  29
  30 log "Fetching PR info"
  31 prInfo=$(gh api \
  32   -H "Accept: application/vnd.github+json" \
  33   -H "X-GitHub-Api-Version: 2022-11-28" \
  34   "/repos/$baseRepo/pulls/$prNumber")
  35
  36 baseBranch=$(jq -r .base.ref <<< "$prInfo")
  37 log "Base branch: $baseBranch"
  38 prRepo=$(jq -r .head.repo.full_name <<< "$prInfo")
  39 log "PR repo: $prRepo"
  40 prBranch=$(jq -r .head.ref <<< "$prInfo")
  41 log "PR branch: $prBranch"
  42 prAuthor=$(jq -r .user.login <<< "$prInfo")
  43 log "PR author: $prAuthor"
  44
  45 extraArgs=()
  46 if pwdRepo=$(git rev-parse --show-toplevel 2>/dev/null); then
  47     # Speedup for local runs
  48     extraArgs+=(--reference-if-able "$pwdRepo")
  49 fi
  50
  51 log "Fetching Nixpkgs commit history"
  52 # We only need the commit history, not the contents, so we can do a tree-less clone using tree:0
  53 # https://github.blog/open-source/git/get-up-to-speed-with-partial-clone-and-shallow-clone/#user-content-quick-summary
  54 git clone --bare --filter=tree:0 --no-tags --origin upstream "${extraArgs[@]}" https://github.com/"$baseRepo".git "$tmp"/nixpkgs.git
  55
  56 log "Fetching the PR commit history"
  57 # Fetch the PR
  58 git -C "$tmp/nixpkgs.git" remote add fork https://github.com/"$prRepo".git
  59 # This remote config is the same as --filter=tree:0 when cloning
  60 git -C "$tmp/nixpkgs.git" config remote.fork.partialclonefilter tree:0
  61 git -C "$tmp/nixpkgs.git" config remote.fork.promisor true
  62
  63 git -C "$tmp/nixpkgs.git" fetch --no-tags fork "$prBranch"
  64 headRef=$(git -C "$tmp/nixpkgs.git" rev-parse refs/remotes/fork/"$prBranch")
  65
  66 log "Checking correctness of the base branch"
  67 if ! "$SCRIPT_DIR"/verify-base-branch.sh "$tmp/nixpkgs.git" "$headRef" "$baseRepo" "$baseBranch" "$prRepo" "$prBranch" | tee "$tmp/invalid-base-error" >&2; then
  68     log "Posting error as comment"
  69     if ! response=$(effect gh api \
  70         --method POST \
  71         -H "Accept: application/vnd.github+json" \
  72         -H "X-GitHub-Api-Version: 2022-11-28" \
  73         "/repos/$baseRepo/issues/$prNumber/comments" \
  74         -F "body=@$tmp/invalid-base-error"); then
  75         log "Failed to post the comment: $response"
  76     fi
  77     exit 1
  78 fi
  79
  80 log "Getting code owners to request reviews from"
  81 "$SCRIPT_DIR"/get-reviewers.sh "$tmp/nixpkgs.git" "$ownersFile" "$baseRepo" "$baseBranch" "$headRef" "$prNumber" "$prAuthor" > "$tmp/reviewers.json"
  82
  83 log "Requesting reviews from: $(<"$tmp/reviewers.json")"
  84
  85 if ! response=$(effect gh api \
  86     --method POST \
  87     -H "Accept: application/vnd.github+json" \
  88     -H "X-GitHub-Api-Version: 2022-11-28" \
  89     "/repos/$baseRepo/pulls/$prNumber/requested_reviewers" \
  90     --input "$tmp/reviewers.json"); then
  91     log "Failed to request reviews: $response"
  92     exit 1
  93 fi
  94
  95 log "Successfully requested reviews"