mirror of
https://github.com/tailscale/tailscale.git
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89 lines
2.4 KiB
Plaintext
89 lines
2.4 KiB
Plaintext
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#!/bin/sh
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#
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# This script acts like the "go" command, but uses Tailscale's
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# currently-desired version from https://github.com/tailscale/go,
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# downloading it first if necessary.
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set -eu
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log() {
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echo "$@" >&2
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}
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DEFAULT_TOOLCHAIN_DIR="${HOME}/.cache/tailscale-go"
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TOOLCHAIN="${TOOLCHAIN-${DEFAULT_TOOLCHAIN_DIR}}"
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TOOLCHAIN_GO="${TOOLCHAIN}/bin/go"
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read -r REV < "$(dirname "$0")/../go.toolchain.rev"
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# Fast, quiet path, when Tailscale is already current.
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if [ -e "${TOOLCHAIN_GO}" ]; then
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short_hash=$("${TOOLCHAIN_GO}" version | sed 's/.*-ts//; s/ .*//')
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case $REV in
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"$short_hash"*)
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unset GOROOT
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exec "${TOOLCHAIN_GO}" "$@"
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esac
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fi
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# This works for linux and darwin, which is sufficient
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# (we do not build tailscale-go for other targets).
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GOOS=$(uname -s | tr A-Z a-z)
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ARCH="$(uname -m)"
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if [ "$ARCH" = "aarch64" ]; then
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# Go uses the name "arm64".
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ARCH="arm64"
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elif [ "$ARCH" = "x86_64" ]; then
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# Go uses the name "amd64".
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ARCH="amd64"
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fi
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get_cached() {
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if [ ! -d "$TOOLCHAIN" ]; then
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mkdir -p "$TOOLCHAIN"
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fi
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archive="$TOOLCHAIN-$REV.tar.gz"
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mark="$TOOLCHAIN.extracted"
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extracted=
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[ ! -e "$mark" ] || read -r extracted junk <$mark
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if [ "$extracted" = "$REV" ] && [ -e "${TOOLCHAIN_GO}" ]; then
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# already ok
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log "Go toolchain '$REV' already extracted."
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return 0
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fi
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rm -f "$archive.new" "$TOOLCHAIN.extracted"
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if [ ! -e "$archive" ]; then
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log "Need to download go '$REV'."
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if [ "$ARCH" = "amd64" ]; then
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# For historic reasons, the tailscale/go amd64 release artifacts don't
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# have the arch in their name.
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BUILD="$GOOS"
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else
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BUILD="$GOOS-$ARCH"
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fi
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curl -f -L -o "$archive.new" "https://github.com/tailscale/go/releases/download/build-${REV}/${BUILD}.tar.gz"
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rm -f "$archive"
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mv "$archive.new" "$archive"
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fi
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log "Extracting tailscale/go rev '$REV'" >&2
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log " into '$TOOLCHAIN'." >&2
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rm -rf "$TOOLCHAIN"
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mkdir -p "$TOOLCHAIN"
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(cd "$TOOLCHAIN" && tar --strip-components=1 -xf "$archive")
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echo "$REV" >$mark
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}
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if [ "${REV}" = "SKIP" ] ||
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[ "${GOOS}" != "darwin" -a "${GOOS}" != "linux" ] ||
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[ "${ARCH}" != "amd64" -a "${ARCH}" != "arm64" ]; then
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# Use whichever go is available
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exec go "$@"
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else
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get_cached
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fi
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unset GOROOT
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exec "${TOOLCHAIN_GO}" "$@"
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