from repo 's help, I found following information:

The -d/--detach option can be used to switch specified projects back to the manifest revision. This option is especially helpful if the project is currently on a topic branch, but the manifest revision is temporarily needed.

1 Can someone tell me what the situation to use the -d option?

2 Does it means I can get a working repo exactly the same as remote repository, no matter what topic you are working on.

android-source repository
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