86 lines
2.7 KiB
Bash
86 lines
2.7 KiB
Bash
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#!/bin/bash
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set -x
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deforg="$1"
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defrepo="$2"
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defbranch="$3"
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rm -r "$defrepo" || true
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# figure out where to look for pull requests:
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# - We may have been told an explicit repo via the PR_ORG/PR_REPO/PR_NUMBER env vars
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# - otherwise, check the $GITHUB_ env vars which are set by Github Actions
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# - failing that, fall back to the element-hq/element-web repo.
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#
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# in ether case, the PR_NUMBER variable must be set explicitly.
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default_org_repo=${GITHUB_REPOSITORY:-"element-hq/element-web"}
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PR_ORG=${PR_ORG:-${default_org_repo%%/*}}
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PR_REPO=${PR_REPO:-${default_org_repo##*/}}
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# A function that clones a branch of a repo based on the org, repo and branch
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clone() {
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org=$1
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repo=$2
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branch=$3
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if [ -n "$branch" ]
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then
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echo "Trying to use $org/$repo#$branch"
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# Disable auth prompts: https://serverfault.com/a/665959
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GIT_TERMINAL_PROMPT=0 git clone https://github.com/$org/$repo.git $repo --branch "$branch" --depth 1 && exit 0
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fi
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}
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# A function that gets info about a PR from the GitHub API based on its number
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getPRInfo() {
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number=$1
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if [ -n "$number" ]; then
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echo "Getting info about a PR with number $number"
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apiEndpoint="https://api.github.com/repos/$PR_ORG/$PR_REPO/pulls/$number"
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head=$(curl $apiEndpoint | jq -r '.head.label')
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fi
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}
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# Some CIs don't give us enough info, so we just get the PR number and ask the
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# GH API for more info - "fork:branch". Some give us this directly.
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if [ -n "$BUILDKITE_BRANCH" ]; then
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# BuildKite
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head=$BUILDKITE_BRANCH
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elif [ -n "$PR_NUMBER" ]; then
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# GitHub
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getPRInfo $PR_NUMBER
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elif [ -n "$REVIEW_ID" ]; then
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# Netlify
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getPRInfo $REVIEW_ID
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fi
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# for forks, $head will be in the format "fork:branch", so we split it by ":"
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# into an array. On non-forks, this has the effect of splitting into a single
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# element array given ":" shouldn't appear in the head - it'll just be the
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# branch name. Based on the results, we clone.
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BRANCH_ARRAY=(${head//:/ })
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TRY_ORG=$deforg
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TRY_BRANCH=${BRANCH_ARRAY[0]}
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if [[ "$head" == *":"* ]]; then
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# ... but only match that fork if it's a real fork
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if [ "${BRANCH_ARRAY[0]}" != "$PR_ORG" ]; then
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TRY_ORG=${BRANCH_ARRAY[0]}
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fi
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TRY_BRANCH=${BRANCH_ARRAY[1]}
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fi
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clone ${TRY_ORG} $defrepo ${TRY_BRANCH}
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# Try the target branch of the push or PR.
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if [ -n "$GITHUB_BASE_REF" ]; then
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clone $deforg $defrepo $GITHUB_BASE_REF
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elif [ -n "$BUILDKITE_PULL_REQUEST_BASE_BRANCH" ]; then
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clone $deforg $defrepo $BUILDKITE_PULL_REQUEST_BASE_BRANCH
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fi
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# Try HEAD which is the branch name in Netlify (not BRANCH which is pull/xxxx/head for PR builds)
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clone $deforg $defrepo $HEAD
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# Use the default branch as the last resort.
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clone $deforg $defrepo $defbranch
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