Brad Fitzpatrick d5341fd60c tailscaleroot: add test that tsgo rev is in Go build cache keys ...

Verify that GODEBUG=gocachehash=1 output from ./tool/go includes the
git revision from go.toolchain.rev, ensuring that bumping the Tailscale
Go fork (without a Go version number change) properly invalidates the
build cache.

The test only runs in CI or when the current Go binary is the Tailscale
toolchain (GOROOT contains /.cache/tsgo/), so open source contributors
using stock Go aren't forced to download tsgo.

Fixes tailscale/corp#36589

Change-Id: Ia98d3a3aa8c7fa67f9a0293066fa02a1997dcb95
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>

2026-04-13 10:17:22 -07:00

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