If "git pull --recurse-submodules --rebase" is invoked when the current
branch and its corresponding remote-tracking branch have no merge base,
a "bad object" fatal error occurs. This issue was introduced with commit
a6d7eb2c7a ("pull: optionally rebase submodules (remote submodule
changes only)", 2017-06-23), which also introduced this feature.This is because cmd_pull() in builtin/pull.c thus invokes submodule_touches_in_range() with a null OID as the first parameter. Ensure that this case works, and document what happens in this case. Signed-off-by: Jonathan Tan <[email protected]> --- submodule.c | 6 ++++-- submodule.h | 5 ++++- t/t5572-pull-submodule.sh | 21 +++++++++++++++++++++ 3 files changed, 29 insertions(+), 3 deletions(-) diff --git a/submodule.c b/submodule.c index 74d35b2577..49def93dd9 100644 --- a/submodule.c +++ b/submodule.c @@ -1169,8 +1169,10 @@ int submodule_touches_in_range(struct object_id *excl_oid, argv_array_push(&args, "--"); /* args[0] program name */ argv_array_push(&args, oid_to_hex(incl_oid)); - argv_array_push(&args, "--not"); - argv_array_push(&args, oid_to_hex(excl_oid)); + if (!is_null_oid(excl_oid)) { + argv_array_push(&args, "--not"); + argv_array_push(&args, oid_to_hex(excl_oid)); + } collect_changed_submodules(&subs, &args); ret = subs.nr; diff --git a/submodule.h b/submodule.h index e5526f6aaa..1fd7111f60 100644 --- a/submodule.h +++ b/submodule.h @@ -94,7 +94,10 @@ extern int merge_submodule(struct object_id *result, const char *path, const struct object_id *a, const struct object_id *b, int search); -/* Checks if there are submodule changes in a..b. */ +/* + * Checks if there are submodule changes in a..b. If a is the null OID, + * checks b and all its ancestors instead. + */ extern int submodule_touches_in_range(struct object_id *a, struct object_id *b); extern int find_unpushed_submodules(struct oid_array *commits, diff --git a/t/t5572-pull-submodule.sh b/t/t5572-pull-submodule.sh index 321bd37deb..f916729a12 100755 --- a/t/t5572-pull-submodule.sh +++ b/t/t5572-pull-submodule.sh @@ -132,4 +132,25 @@ test_expect_success 'pull rebase recursing fails with conflicts' ' test_i18ngrep "locally recorded submodule modifications" err ' +test_expect_success 'branch has no merge base with remote-tracking counterpart' ' + rm -rf parent child && + + test_create_repo a-submodule && + test_commit -C a-submodule foo && + + test_create_repo parent && + git -C parent submodule add "$(pwd)/a-submodule" && + git -C parent commit -m foo && + + git clone parent child && + + # Reset master so that it has no merge base with + # refs/remotes/origin/master. + OTHER=$(git -C child commit-tree -m bar \ + $(git -C child rev-parse HEAD^{tree})) && + git -C child reset --hard "$OTHER" && + + git -C child pull --recurse-submodules --rebase +' + test_done -- 2.17.0.768.g1526ddbba1.dirty
