zulip/scripts/lib/install-yarn

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#!/usr/bin/env bash
set -euo pipefail
version=1.22.19
sha256=732620bac8b1690d507274f025f3c6cfdc3627a84d9642e38a07452cc00e0f2e
tarball="yarn-$version.tgz"
check_version() {
# Reading the version of Yarn from its package.json is much faster
# than running yarn --version.
current_version="$(jq -r '.version' /srv/zulip-yarn/package.json)" \
&& [ "$current_version" = "$version" ]
}
if ! check_version; then
tmpdir="$(mktemp -d)"
trap 'rm -r "$tmpdir"' EXIT
cd "$tmpdir"
curl -fLO --retry 3 "https://registry.npmjs.org/yarn/-/$tarball"
sha256sum -c <<<"$sha256 $tarball"
rm -rf /srv/zulip-yarn
mkdir /srv/zulip-yarn
tar -xzf "$tarball" --no-same-owner --strip-components=1 -C /srv/zulip-yarn
check_version
fi