{"action":"created","comment":{"url":"https://api.github.com/repos/keybase/kbfs/pulls/comments/85213529","pull_request_review_id":5942000,"id":85213529,"diff_hunk":"@@ -101,27 +101,124 @@ func checkFileBlock(ctx context.Context, config libkbfs.Config,\n \treturn nil\n }\n \n-func mdCheckOne(ctx context.Context, config libkbfs.Config,\n-\tinput string, rmd libkbfs.ImmutableRootMetadata, verbose bool) error {\n-\tdata := rmd.Data()\n+// mdCheckChain checks that the given MD object is a valid successor\n+// of the previous revision, and so on all the way back to the given\n+// revision. Along the way, it also checks that the root blocks that\n+// haven't been garbage-collected are present. It returns a list of MD\n+// objects with valid roots, in reverse revision order. If multiple MD\n+// objects have the same root (which are assumed to all be adjacent),\n+// the most recent one is returned.\n+func mdCheckChain(ctx context.Context, config libkbfs.Config,\n+\tirmd libkbfs.ImmutableRootMetadata,\n+\tminRevision libkbfs.MetadataRevision, verbose bool) (\n+\tirmdsWithRoots []libkbfs.ImmutableRootMetadata, err error) {\n+\tfmt.Printf(\"Checking chain from rev %d to %d...\\n\",\n+\t\tminRevision, irmd.Revision())\n+\tgcUnrefs := make(map[libkbfs.BlockRef]bool)\n+\tfor irmd.Revision() > minRevision {\n+\t\trootPtr := irmd.Data().Dir.BlockPointer\n+\t\tif !rootPtr.Ref().IsValid() 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this in a comment?","created_at":"2016-10-26T20:31:50Z","updated_at":"2016-10-26T20:31:50Z","html_url":"https://github.com/keybase/kbfs/pull/464#discussion_r85213529","pull_request_url":"https://api.github.com/repos/keybase/kbfs/pulls/464","_links":{"self":{"href":"https://api.github.com/repos/keybase/kbfs/pulls/comments/85213529"},"html":{"href":"https://github.com/keybase/kbfs/pull/464#discussion_r85213529"},"pull_request":{"href":"https://api.github.com/repos/keybase/kbfs/pulls/464"}}},"pull_request":{"url":"https://api.github.com/repos/keybase/kbfs/pulls/464","id":90918186,"html_url":"https://github.com/keybase/kbfs/pull/464","diff_url":"https://github.com/keybase/kbfs/pull/464.diff","patch_url":"https://github.com/keybase/kbfs/pull/464.patch","issue_url":"https://api.github.com/repos/keybase/kbfs/issues/464","number":464,"state":"open","locked":false,"title":"[KBFS-1599] Enhance md check tool to check 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