cmd/go/internal/vcsweb/vcstest: skip bzr test if deps not found

The linux-arm64 trybots are consistently failing with

    vcstest_test.go:155: 2025/01/30 21:50:41 hello.txt:
        > handle bzr
        > env BZR_EMAIL='Russ Cox <[email protected]>'
        > env EMAIL='Russ Cox <[email protected]>'
        > bzr init-repo .
        [stderr]
        brz: ERROR: Couldn't import breezy and dependencies.
        Please check the directory containing breezy is on your PYTHONPATH.

        Error: PyErr { type: <class 'ModuleNotFoundError'>, value: ModuleNotFoundError("No module named 'breezy'"), traceback: None }

    vcstest_test.go:161: hello.txt:6: bzr init-repo .: exit status 1

This seems to be a problem with the builder.

For now, skip the test if we see that error message, just as we already
skip the test if the bzr executable is not found.

For #71504

Change-Id: If8b6d4dea02dc16198ba6067595dff3340a81299
Reviewed-on: https://go-review.googlesource.com/c/go/+/646635
Reviewed-by: Dmitri Shuralyov <[email protected]>
Auto-Submit: Ian Lance Taylor <[email protected]>
Reviewed-by: Carlos Amedee <[email protected]>
Reviewed-by: Ian Lance Taylor <[email protected]>
LUCI-TryBot-Result: Go LUCI <[email protected]>
Reviewed-by: Dmitri Shuralyov <[email protected]>

Author: ianlancetaylor

src/cmd/go/internal/vcweb/vcstest/vcstest_test.go

@@ -158,6 +158,13 @@ func TestScripts(t *testing.T) {
 				if notInstalled := (vcweb.ServerNotInstalledError{}); errors.As(err, &notInstalled) || errors.Is(err, exec.ErrNotFound) {
 					t.Skip(err)
 				}
+
+				// For issue #71504 ignore an error about
+				// bzr not being able to find dependencies.
+				if strings.Contains(buf.String(), "brz: ERROR: Couldn't import breezy and dependencies.") {
+					t.Skip("skipping test due to bzr installation problem")
+				}
+
 				t.Error(err)
 			}
 		})