The consistency checks for loose objects are hosted by "builtin/fsck.c".
These checks are obviously specific to the "loose" backend.
Move the logic into `odb_source_loose_fsck()`. Introduce a new "verbose"
flag so that we can properly retain semantics around whether or not we
want to print some status messages.
Note that this fixes a bug as a side effect: the progress meter was
captured in the callback data before `start_progress()` was even called,
so the per-subdirectory progress updates always operated on a NULL
pointer and the meter jumped straight from 0 to 256 upon completion. The
new code only sets up the callback data's progress meter after it has
been created, so the progress display now advances incrementally again.
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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