tree bea386790b96b4f6af551cbeb4b44b51d627f8ef
parent 2f0768f8d89d96de7e497ec5afa86c921659bc5c
author Dmitri Shuralyov <dmitshur@golang.org> 1560464939 -0400
committer Dmitri Shuralyov <dmitshur@golang.org> 1560715962 +0000

cmd/makemac: check slice length in isFileSystemReadOnly before access

This is a followup to CL 181217 to address a minor code review comment.
Check the slice length before access, to prevent a possible panic on
unexpected input.

Also improve error string to not end with punctuation, per style guide
entry at golang.org/s/style#error-strings.

Change-Id: I220f6744396740b0e7f92705367be56c83ee23da
Reviewed-on: https://go-review.googlesource.com/c/build/+/182337
Run-TryBot: Dmitri Shuralyov <dmitshur@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Alexander Rakoczy <alex@golang.org>
Reviewed-by: Andrew Bonventre <andybons@golang.org>