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AdvertisedRequestValidator: fix WantNotValidException caused by race
Fetch with protocol V2 failed under the following conditions - fetch uses bidirectional protocol (git, ssh) which uses a shortcut to determine invalid wants - not all wants are advertised - race condition: wanted ref is updated during fetch by another thread after the thread serving upload-pack determined wants and before it checks not advertised wants Fix this by calling `new ReachableCommitRequestValidator().checkWants(up, wants)` instead of throwing WantNotValidException in [1] if this race happened in the same way like it's done for unidirectional protocols (http) [2]. [1] https://github.com/eclipse-jgit/jgit/blob/stable-6.10/org.eclipse.jgit/src/org/eclipse/jgit/transport/UploadPack.java#L2002 [2] https://github.com/eclipse-jgit/jgit/blob/stable-6.10/org.eclipse.jgit/src/org/eclipse/jgit/transport/UploadPack.java#L2000 Bug: jgit-48 Change-Id: I32f28502923815dc49781aab5d810c9afbe7e7e6
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