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git-submodule.sh: try harder to fetch a submodule

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This is the logical continuum of fb43e31f2b (submodule: try harder to
fetch needed sha1 by direct fetching sha1, 2016-02-23) and fixes it as
some assumptions were not correct.

The commit states:
> If $sha1 was not part of the default fetch ... fail ourselves here
> assumes that the fetch_in_submodule only fails when the serverside does
> not support fetching by sha1.

There are other failures, why such a fetch may fail, such as
    fatal: Couldn't find remote ref HEAD
which can happen if the remote side doesn't advertise HEAD and we do not
have a local fetch refspec.

Not advertising HEAD is allowed by the protocol spec and would happen,
if HEAD points at an unborn branch for example.

Not having a local fetch refspec can happen when submodules are fetched
shallowly, as then git-clone doesn't setup a fetch refspec.

So do try even harder for a submodule by ignoring the exit code of the
first fetch and rather relying on the following is_tip_reachable to
see if we try fetching again.

Signed-off-by: Stefan Beller <sbeller@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Stefan Beller 2018-05-15 12:40:54 -07:00 committed by Junio C Hamano
parent 468165c1d8
commit e30d833671
1 changed files with 1 additions and 1 deletions
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2
git-submodule.sh
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@ -614,7 +614,7 @@ cmd_update()
# is not reachable from a ref.
is_tip_reachable "$sm_path" "$sha1" ||
fetch_in_submodule "$sm_path" $depth ||
die "$(eval_gettext "Unable to fetch in submodule path '\$displaypath'")"
say "$(eval_gettext "Unable to fetch in submodule path '\$displaypath'")"
# Now we tried the usual fetch, but $sha1 may
# not be reachable from any of the refs