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tailscale/tool/yarn

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#!/bin/sh
#
# This script acts like the "yarn" command, but uses Tailscale's
# currently-desired version, downloading it (and node) first if necessary.
set -eu
NODE_DIR="$HOME/.cache/tailscale-node"
read -r YARN_REV < "$(dirname "$0")/yarn.rev"
YARN_DIR="$HOME/.cache/tailscale-yarn"
# This works for linux and darwin, which is sufficient
# (we do not build for other targets).
OS=$(uname -s | tr A-Z a-z)
ARCH="$(uname -m)"
if [ "$ARCH" = "aarch64" ]; then
# Go uses the name "arm64".
ARCH="arm64"
elif [ "$ARCH" = "x86_64" ]; then
# Go uses the name "amd64".
ARCH="amd64"
fi
install_node() {
read -r NODE_REV < "$(dirname "$0")/node.rev"
NODE_URL="https://nodejs.org/dist/v${NODE_REV}/node-v${NODE_REV}-${OS}-${ARCH}.tar.gz"
install_tool "node" $NODE_REV $NODE_DIR $NODE_URL
}
install_yarn() {
YARN_URL="https://github.com/yarnpkg/yarn/releases/download/v$YARN_REV/yarn-v$YARN_REV.tar.gz"
install_tool "yarn" $YARN_REV $YARN_DIR $YARN_URL
}
install_tool() {
TOOL=$1
REV=$2
TOOLCHAIN=$3
URL=$4
archive="$TOOLCHAIN-$REV.tar.gz"
mark="$TOOLCHAIN.extracted"
extracted=
[ ! -e "$mark" ] || read -r extracted junk <$mark
if [ "$extracted" = "$REV" ] && [ -e "$TOOLCHAIN/bin/$TOOL" ]; then
# Already extracted, continue silently
return 0
fi
rm -f "$archive.new" "$TOOLCHAIN.extracted"
if [ ! -e "$archive" ]; then
log "Need to download $TOOL '$REV'."
curl -f -L -o "$archive.new" $URL
rm -f "$archive"
mv "$archive.new" "$archive"
fi
log "Extracting $TOOL '$REV' into '$TOOLCHAIN'." >&2
rm -rf "$TOOLCHAIN"
mkdir -p "$TOOLCHAIN"
(cd "$TOOLCHAIN" && tar --strip-components=1 -xf "$archive")
echo "$REV" >$mark
}
log() {
echo "$@" >&2
}
if [ "${YARN_REV}" = "SKIP" ] ||
[ "${OS}" != "darwin" -a "${OS}" != "linux" ] ||
[ "${ARCH}" != "amd64" -a "${ARCH}" != "arm64" ]; then
log "Using existing yarn (`which yarn`)."
exec yarn "$@"
fi
install_node
install_yarn
exec /usr/bin/env PATH="$NODE_DIR/bin:$PATH" "$YARN_DIR/bin/yarn" "$@"