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tailscale/tool/wasm-opt

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#!/bin/sh
#
# This script acts like the "wasm-opt" command from the Binaryen toolchain, but
# uses Tailscale's currently-desired version, downloading it first if necessary.
set -eu
BINARYEN_DIR="$HOME/.cache/tailscale-binaryen"
read -r BINARYEN_REV < "$(dirname "$0")/binaryen.rev"
# This works for Linux and Darwin, which is sufficient
# (we do not build for other targets).
OS=$(uname -s | tr A-Z a-z)
if [ "$OS" = "darwin" ]; then
# Binaryen uses the name "macos".
OS="macos"
fi
ARCH="$(uname -m)"
if [ "$ARCH" = "aarch64" ]; then
# Binaryen uses the name "arm64".
ARCH="arm64"
fi
install_binaryen() {
BINARYEN_URL="https://github.com/WebAssembly/binaryen/releases/download/version_${BINARYEN_REV}/binaryen-version_${BINARYEN_REV}-${ARCH}-${OS}.tar.gz"
install_tool "wasm-opt" $BINARYEN_REV $BINARYEN_DIR $BINARYEN_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
echo ""
rm -f "$archive.new" "$TOOLCHAIN.extracted"
if [ ! -e "$archive" ]; then
log "Need to download $TOOL '$REV' from $URL."
curl -f -L -o "$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 [ "${BINARYEN_DIR}" = "SKIP" ] ||
[ "${OS}" != "macos" -a "${OS}" != "linux" ] ||
[ "${ARCH}" != "x86_64" -a "${ARCH}" != "arm64" ]; then
log "Unsupported OS (${OS}) and architecture (${ARCH}) combination."
log "Using existing wasm-opt (`which wasm-opt`)."
exec wasm-opt "$@"
fi
install_binaryen
"$BINARYEN_DIR/bin/wasm-opt" "$@"