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12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061#!/bin/sh# Retrieve the latest Go toolchain.# Set TS_GO_NEXT=1 to update go.toolchain.next.rev instead.#set -eucd "$(dirname "$0")"
if [ "${TS_GO_NEXT:-}" = "1" ]; then go_toolchain_branch_file="go.toolchain.next.branch" go_toolchain_rev_file="go.toolchain.next.rev"else go_toolchain_branch_file="go.toolchain.branch" go_toolchain_rev_file="go.toolchain.rev"fi
read -r go_branch <"$go_toolchain_branch_file"upstream=$(git ls-remote https://github.com/tailscale/go "$go_branch" | awk '{print $1}')current=$(cat "$go_toolchain_rev_file")if [ "$upstream" != "$current" ]; then echo "$upstream" >"$go_toolchain_rev_file"fi
# When updating the regular (non-next) toolchain, also bump go.toolchain.next.rev# if it has fallen behind on the same branch. This happens when "next" was tracking# a release candidate (e.g. Go 1.26.0rc2) and the regular toolchain later gets# bumped to a newer release (e.g. Go 1.26.2) on the same branch. At that point# the "next" rev shouldn't still point at the older RC.if [ "${TS_GO_NEXT:-}" != "1" ]; then read -r next_branch <go.toolchain.next.branch if [ "$go_branch" = "$next_branch" ]; then next_rev=$(cat go.toolchain.next.rev) new_rev=$(cat go.toolchain.rev) if [ "$next_rev" != "$new_rev" ]; then # Fetch only commit objects (no trees/blobs) with limited depth # to keep this fast — we just need the commit graph for ancestry check. tmpdir="/tmp/tailscale-pull-toolchain-$$" if git clone --bare --filter=tree:0 --depth=20000 --single-branch --branch "$go_branch" \ https://github.com/tailscale/go "$tmpdir" 2>/dev/null; then if git -C "$tmpdir" merge-base --is-ancestor "$next_rev" "$new_rev" 2>/dev/null; then echo "$new_rev" >go.toolchain.next.rev echo "pull-toolchain.sh: also bumped go.toolchain.next.rev to match (was behind on same branch)" >&2 fi fi rm -rf "$tmpdir" fi fifi
# Only update go.toolchain.version and flakehashes.json for the main toolchain,# skipping it if TS_GO_NEXT=1. Those two files are only used by Nix, and as of 2026-01-26# don't yet support TS_GO_NEXT=1 with flake.nix or in our corp CI.if [ "${TS_GO_NEXT:-}" != "1" ]; then ./tool/go version 2>/dev/null | awk '{print $3}' | sed 's/^go//' > go.toolchain.version ./tool/go mod edit -go "$(cat go.toolchain.version)" ./tool/go run ./tool/updateflakesfi
if [ -n "$(git diff-index --name-only HEAD -- "$go_toolchain_rev_file" go.toolchain.next.rev flakehashes.json go.toolchain.version)" ]; then echo "pull-toolchain.sh: changes imported. Use git commit to make them permanent." >&2fi