fetch: control lifecycle of FETCH_HEAD in a single place

There are two different locations where we're appending to FETCH_HEAD:
first when storing updated references, and second when backfilling tags.
Both times we open the file, append to it and then commit it into place,
which is essentially duplicate work.

Improve the lifecycle of updating FETCH_HEAD by opening and committing
it once in `do_fetch()`, where we pass the structure down to the code
which wants to append to it.

Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

0 files changed, 0 insertions, 0 deletions