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 <jonathantanmy@xxxxxxxxxx>
---
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
