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pull: check for local submodule modifications with the right range

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Ever since 'git pull' learned '--recurse-submodules' in a6d7eb2c7a
(pull: optionally rebase submodules (remote submodule changes only),
2017-06-23), we check if there are local submodule modifications by
checking the revision range 'curr_head --not rebase_fork_point'.

The goal of this check is to abort the pull if there are submodule
modifications in the local commits being rebased, since this scenario is
not supported.

However, the actual range of commits being rebased is not
'rebase_fork_point..curr_head', as the logic in
'get_rebase_newbase_and_upstream' reveals, it is 'upstream..curr_head'.

If the 'git merge-base --fork-point' invocation in
'get_rebase_fork_point' fails to find a fork point between the current
branch and the remote-tracking branch we are pulling from,
'rebase_fork_point' is null and since 4d36f88be7 (submodule: do not pass
null OID to setup_revisions, 2018-05-24), 'submodule_touches_in_range'
checks 'curr_head' and all its ancestors for submodule modifications.

Since it is highly likely that there are submodule modifications in this
range (which is in effect the whole history of the current branch), this
prevents 'git pull --rebase --recurse-submodules' from succeeding if no
fork point exists between the current branch and the remote-tracking
branch being pulled. This can happen, for example, when the current
branch was forked from a commit which was never recorded in the reflog
of the remote-tracking branch we are pulling, as the last two paragraphs
of the "Discussion on fork-point mode" section in git-merge-base(1)
explain.

Fix this bug by passing 'upstream' instead of 'rebase_fork_point' as the
'excl_oid' argument to 'submodule_touches_in_range'.

Reported-by: Brice Goglin <bgoglin@free.fr>
Signed-off-by: Philippe Blain <levraiphilippeblain@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Philippe Blain 2020-11-14 00:34:45 +00:00 committed by Junio C Hamano
parent f260c6b46c
commit 5176f20ffe
2 changed files with 30 additions and 1 deletions
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2
builtin/pull.c
View File

@ -1037,7 +1037,7 @@ int cmd_pull(int argc, const char **argv, const char *prefix)
if ((recurse_submodules == RECURSE_SUBMODULES_ON ||
recurse_submodules == RECURSE_SUBMODULES_ON_DEMAND) &&
submodule_touches_in_range(the_repository, &rebase_fork_point, &curr_head))
submodule_touches_in_range(the_repository, &upstream, &curr_head))
die(_("cannot rebase with locally recorded submodule modifications"));
if (!autostash) {
struct commit_list *list = NULL;

29
t/t5572-pull-submodule.sh
View File

@ -144,6 +144,35 @@ test_expect_success 'pull --rebase --recurse-submodules fails if both sides reco
test_i18ngrep "locally recorded submodule modifications" err
'
test_expect_success 'pull --rebase --recurse-submodules (no submodule changes, no fork-point)' '
# This tests the following scenario :
# - local submodule does not have new commits
# - local superproject has new commits that *do not* change the submodule pointer
# - upstream superproject has new commits that *do not* change the submodule pointer
# - local superproject branch has no fork-point with its remote-tracking counter-part
# create upstream superproject
test_create_repo submodule &&
test_commit -C submodule first_in_sub &&
test_create_repo superprojet &&
test_commit -C superprojet first_in_super &&
git -C superprojet submodule add ../submodule &&
git -C superprojet commit -m "add submodule" &&
test_commit -C superprojet third_in_super &&
# clone superproject
git clone --recurse-submodules superprojet superclone &&
# add commits upstream
test_commit -C superprojet fourth_in_super &&
# create topic branch in clone, not based on any remote-tracking branch
git -C superclone checkout -b feat HEAD~1 &&
test_commit -C superclone first_on_feat &&
git -C superclone pull --rebase --recurse-submodules origin master
'
# NOTE:
#
# This test is particular because there is only a single commit in the upstream superproject