launcher: avoid crash when executing out of checkout
When developing repo itself, it helps to run repo directly out of it and to run bisection tools. The current _SetDefaultsTo logic fails in that situation though as it wants a branch, but the source isn't checked out to one. Now that we support tracking commits via the --repo-rev setting, fall back to using the current HEAD commit. Change-Id: I37d79fd9f7bea87d212421ebed6c8267ec95145f Reviewed-on: https://gerrit-review.googlesource.com/c/git-repo/+/260192 Tested-by: Mike Frysinger <vapier@google.com> Reviewed-by: Jonathan Nieder <jrn@google.com>
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e257d566
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