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element-desktop/scripts/branch-match.sh
2025-05-20 14:18:54 +01:00

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#!/bin/bash
# Script for downloading a branch of element-web matching the branch a PR is contributed from
set -x
deforg="element-hq"
defrepo="element-web"
# The PR_NUMBER variable must be set explicitly.
default_org_repo=${GITHUB_REPOSITORY:-"$deforg/$defrepo"}
PR_ORG=${PR_ORG:-${default_org_repo%%/*}}
PR_REPO=${PR_REPO:-${default_org_repo##*/}}
# A function that clones a branch of a repo based on the org, repo and branch
clone() {
org=$1
repo=$2
branch=$3
if [ -n "$branch" ]
then
echo "Trying to use $org/$repo#$branch"
# Disable auth prompts: https://serverfault.com/a/665959
GIT_TERMINAL_PROMPT=0 git clone https://github.com/$org/$repo.git $repo --branch "$branch" --depth 1 && exit 0
fi
}
echo "Getting info about a PR with number $PR_NUMBER"
apiEndpoint="https://api.github.com/repos/$PR_ORG/$PR_REPO/pulls/$PR_NUMBER"
head=$(curl "$apiEndpoint" | jq -r '.head.label')
# for forks, $head will be in the format "fork:branch", so we split it by ":"
# into an array. On non-forks, this has the effect of splitting into a single
# element array given ":" shouldn't appear in the head - it'll just be the
# branch name. Based on the results, we clone.
BRANCH_ARRAY=(${head//:/ })
TRY_ORG=$deforg
TRY_BRANCH=${BRANCH_ARRAY[0]}
if [[ "$head" == *":"* ]]; then
# ... but only match that fork if it's a real fork
if [ "${BRANCH_ARRAY[0]}" != "$PR_ORG" ]; then
TRY_ORG=${BRANCH_ARRAY[0]}
fi
TRY_BRANCH=${BRANCH_ARRAY[1]}
fi
clone "$TRY_ORG" "$defrepo" "$TRY_BRANCH"
exit 1