cmd/go: convert TestCacheVet to a script

This test was failing when GOROOT was read-only.

(I'm not sure why that was the case, but it's simpler to convert to to
a script than to try to debug the non-script test.)

Updates #28387

Change-Id: I9943e28d990e5d8b01da10e70531f3ab99e319a7
Reviewed-on: https://go-review.googlesource.com/c/go/+/206897
Run-TryBot: Bryan C. Mills <bcmills@google.com>
Reviewed-by: Jay Conrod <jayconrod@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>

1 files changed, 11 insertions, 0 deletions

diff --git a/src/cmd/go/script_test.go b/src/cmd/go/script_test.go
index 942fca85a8..fbe4698ee5 100644
--- a/src/cmd/go/script_test.go
+++ b/src/cmd/go/script_test.go
@@ -292,6 +292,17 @@ Script:
 					}).(bool)
 					break
 				}
+				if strings.HasPrefix(cond.tag, "GODEBUG:") {
+					value := strings.TrimPrefix(cond.tag, "GODEBUG:")
+					parts := strings.Split(os.Getenv("GODEBUG"), ",")
+					for _, p := range parts {
+						if strings.TrimSpace(p) == value {
+							ok = true
+							break
+						}
+					}
+					break
+				}
 				if !imports.KnownArch[cond.tag] && !imports.KnownOS[cond.tag] && cond.tag != "gc" && cond.tag != "gccgo" {
 					ts.fatalf("unknown condition %q", cond.tag)
 				}