Print helpful error message when updating depot_tools on Windows
The depot_tools directory may get into a state in which its no longer a git repo, in which case we can't update it. On Windows this would cause the update_depot_tools.bat script to fail with a somewhat confusing error message, this CL fixes that to inform the user what happened and what they should do about it. Bug: 1333997 Change-Id: I2c60fc46f1fae7811ff6610e25380d08010d0597 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/3718926Reviewed-by:Bruce Dawson <brucedawson@chromium.org> Commit-Queue: Will Cassella <cassew@chromium.org> Reviewed-by:
Brian Sheedy <bsheedy@chromium.org> Reviewed-by:
Aravind Vasudevan <aravindvasudev@google.com>
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