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c95583bf4f
If a client was created with "repo init --mirror" then there are no working directories present, and no files checked out. Using a command like "repo status" in this context makes no sense, and actually throws back a Pytyon traceback at the console when the underlying commands fail out. We now tag commands with the MirrorSafeCommand type if they are able to be executed within a mirror directory safely. Using a command in a mirror which lacks this base class results in a useful error letting you know the command isn't supported. Bug: REPO-14 Signed-off-by: Shawn O. Pearce <sop@google.com>