Re: [PATCH 1/1] fast-import: checkpoint: dump branches/tags/marks even if object_count==0

"Eric Rannaud" [off-list ref] writes:

+# The commands in input_file should not produce any output on the file
+# descriptor set with --cat-blob-fd (or stdout if unspecified).

Thanks for documenting this.  Swapping the order of starting
fast-import and feeding its input (which is one change in this
version relative to the previous one) alone would not help, because
in the updated order in this patch, nobody is reading from
fast-import until the parent process finishes feeding it.