zulip/tools/cache-zulip-git-version

#!/usr/bin/env bash
set -eu

cd "$(dirname "$0")/.."
remote="$(git config zulip.zulipRemote)" || remote=upstream
{
    git describe --always --tags --match='[0-9]*'
    branches="$(git for-each-ref --format='%(objectname)' "refs/remotes/$remote/master" "refs/remotes/$remote/*.x")"
    mapfile -t branches <<<"$branches"
    if merge_base="$(git merge-base -- HEAD "${branches[@]}")"; then
        git describe --always --tags --match='[0-9]*' -- "$merge_base"
    fi
} >zulip-git-version