zulip/scripts/lib/install-yarn

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#!/usr/bin/env bash
set -euo pipefail
version=1.22.17
sha256=267982c61119a055ba2b23d9cf90b02d3d16c202c03cb0c3a53b9633eae37249
tarball="yarn-$version.tgz"
check_version() {
# Reading the version of Yarn from its package.json is much faster
# than running yarn --version.
link="$(command -v yarn)" \
&& bin="$(readlink -f "$link")" \
&& [ "$bin" = /srv/zulip-yarn/bin/yarn ] \
&& current_version="$(jq -r '.version' /srv/zulip-yarn/package.json)" \
&& [ "$current_version" = "$version" ]
}
if ! check_version; then
tmpdir="$(mktemp -d)"
trap 'rm -r "$tmpdir"' EXIT
cd "$tmpdir"
curl -fLO "https://registry.npmjs.org/yarn/-/$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
ln -nsf /srv/zulip-yarn/bin/yarn /usr/bin/yarn
check_version
fi