103 lines
3.6 KiB
Bash
Executable File
103 lines
3.6 KiB
Bash
Executable File
#!/usr/bin/env sh
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# Copyright (c) Tailscale Inc & AUTHORS
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# SPDX-License-Identifier: BSD-3-Clause
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#
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# gocross-wrapper.sh is a wrapper that can be aliased to 'go', which
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# transparently builds gocross using a "bootstrap" Go toolchain, and
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# then invokes gocross.
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set -eu
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if [ "${CI:-}" = "true" ]; then
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set -x
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fi
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# Locate a bootstrap toolchain and (re)build gocross if necessary. We run all of
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# this in a subshell because posix shell semantics make it very easy to
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# accidentally mutate the input environment that will get passed to gocross at
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# the bottom of this script.
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(
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repo_root="$(dirname $0)/../.."
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# Figuring out if gocross needs a rebuild, as well as the rebuild itself, need
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# to happen with CWD inside this repo. Since we're in a subshell entirely
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# dedicated to wrangling gocross and toolchains, cd over now before doing
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# anything further so that the rest of this logic works the same if gocross is
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# being invoked from somewhere else.
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cd "$repo_root"
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toolchain="$HOME/.cache/tailscale-go"
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if [ -d "$toolchain" ]; then
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# A toolchain exists, but is it recent enough to compile gocross? If not,
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# wipe it out so that the next if block fetches a usable one.
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want_go_minor=$(egrep '^go ' "$repo_root/go.mod" | cut -f2 -d'.')
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have_go_minor=$(cut -f2 -d'.' <$toolchain/VERSION)
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if [ -z "$have_go_minor" -o "$have_go_minor" -lt "$want_go_minor" ]; then
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rm -rf "$toolchain" "$toolchain.extracted"
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fi
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fi
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if [ ! -d "$toolchain" ]; then
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mkdir -p "$HOME/.cache"
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# We need any Go toolchain to build gocross, but the toolchain also has to
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# be reasonably recent because we upgrade eagerly and gocross might not
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# build with Go N-1. So, if we have no cached tailscale toolchain at all,
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# fetch the initial one in shell. Once gocross is built, it'll manage
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# updates.
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read -r REV <$repo_root/go.toolchain.rev
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case "$REV" in
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/*)
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toolchain="$REV"
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;;
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*)
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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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HOST_OS=$(uname -s | tr A-Z a-z)
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HOST_ARCH="$(uname -m)"
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if [ "$HOST_ARCH" = "aarch64" ]; then
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# Go uses the name "arm64".
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HOST_ARCH="arm64"
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elif [ "$HOST_ARCH" = "x86_64" ]; then
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# Go uses the name "amd64".
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HOST_ARCH="amd64"
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fi
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rm -rf "$toolchain" "$toolchain.extracted"
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curl -f -L -o "$toolchain.tar.gz" "https://github.com/tailscale/go/releases/download/build-${REV}/${HOST_OS}-${HOST_ARCH}.tar.gz"
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mkdir -p "$toolchain"
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(cd "$toolchain" && tar --strip-components=1 -xf "$toolchain.tar.gz")
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echo "$REV" >"$toolchain.extracted"
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rm -f "$toolchain.tar.gz"
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;;
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esac
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fi
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# Binaries run with `gocross run` can reinvoke gocross, resulting in a
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# potentially fancy build that invokes external linkers, might be
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# cross-building for other targets, and so forth. In one hilarious
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# case, cmd/cloner invokes go with GO111MODULE=off at some stage.
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#
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# Anyway, build gocross in a stripped down universe.
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gocross_path="$repo_root/gocross"
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gocross_ok=0
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wantver="$(git rev-parse HEAD)"
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if [ -x "$gocross_path" ]; then
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gotver="$($gocross_path gocross-version 2>/dev/null || echo '')"
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if [ "$gotver" = "$wantver" ]; then
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gocross_ok=1
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fi
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fi
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if [ "$gocross_ok" = "0" ]; then
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unset GOOS
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unset GOARCH
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unset GO111MODULE
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unset GOROOT
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export CGO_ENABLED=0
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"$toolchain/bin/go" build -o "$gocross_path" -ldflags "-X tailscale.com/version.gitCommitStamp=$wantver" tailscale.com/tool/gocross
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fi
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) # End of the subshell execution.
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exec "$(dirname $0)/../../gocross" "$@"
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