cmd/go: skip tests using Git on Plan 9

TestScript/get_unicode, TestScript/get_dotfiles and
TestScript/get_brace are failing on Plan 9 since they
expect a full-featured git command, while the git tool
has been emulated as a simple rc script on Plan 9.

This change skips tests using Git on Plan 9.

Fixes #29640.

Change-Id: Id7f6fdca552167f4631fe401f63167e5653daafa
Reviewed-on: https://go-review.googlesource.com/c/157119
Run-TryBot: David du Colombier <0intro@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

diff --git a/src/cmd/go/script_test.go b/src/cmd/go/script_test.go
index 4aa92625dde3cce13fea67ee05d6b5f061af524b..c56c1fd3e42a13db956a458ade78f9e53118deea 100644 (file)
--- a/src/cmd/go/script_test.go
+++ b/src/cmd/go/script_test.go
@@ -283,6 +283,11 @@ Script:
                                if strings.HasPrefix(cond, "exec:") {
                                        prog := cond[len("exec:"):]
                                        ok = execCache.Do(prog, func() interface{} {
+                                               if runtime.GOOS == "plan9" && prog == "git" {
+                                                       // The Git command is usually not the real Git on Plan 9.
+                                                       // See https://golang.org/issues/29640.
+                                                       return false
+                                               }
                                                _, err := exec.LookPath(prog)
                                                return err == nil
                                        }).(bool)