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tool/gocross: bootstrap correctly on an older toolchain

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Sometimes, our cached toolchain ends up being an older version of
Go, older than our go.mod allows. In that scenario, gocross-wrapper.sh
would find a usable toolchain, but then fail to compile gocross.

This change makes the wrapper script check that the cached toolchain's
minor version is good enough to build tailscale.com, and re-bootstraps
in shell if not.

Signed-off-by: David Anderson <danderson@tailscale.com>
This commit is contained in:
David Anderson 2023-02-27 14:08:28 -08:00 committed by Dave Anderson
parent 97b6d3e917
commit df3996cae3
1 changed files with 9 additions and 0 deletions
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9
tool/gocross/gocross-wrapper.sh
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@ -21,6 +21,15 @@ repo_root="$(dirname $0)/../.."
toolchain="$HOME/.cache/tailscale-go" toolchain="$HOME/.cache/tailscale-go"
if [ -d "$toolchain" ]; then
# A toolchain exists, but is it recent enough to compile gocross? If not,
# wipe it out so that the next if block fetches a usable one.
want_go_minor=$(egrep '^go ' "$repo_root/go.mod" | cut -f2 -d'.')
have_go_minor=$(cut -f2 -d'.' <$toolchain/VERSION)
if [ -z "$have_go_minor" -o "$have_go_minor" -lt "$want_go_minor" ]; then
rm -rf "$toolchain" "$toolchain.extracted"
fi
fi
if [ ! -d "$toolchain" ]; then if [ ! -d "$toolchain" ]; then
mkdir -p "$HOME/.cache" mkdir -p "$HOME/.cache"