`git merge-recursive` does a three-way merge between user-specified trees
base, head, and remote. Since the user is allowed to specify head, we can
not necesarily assume that head == HEAD.
Modify index_has_changes() to take an extra argument specifying the tree
to compare against. If NULL, it will compare to HEAD. We then use this
from merge-recursive to make sure we compare to the user-specified head.
Signed-off-by: Elijah Newren <newren@xxxxxxxxx>
---
builtin/am.c | 7 ++++---
cache.h | 11 +++++++----
merge-recursive.c | 2 +-
read-cache.c | 12 ++++++++----
t/t6044-merge-unrelated-index-changes.sh | 2 +-
5 files changed, 21 insertions(+), 13 deletions(-)
diff --git a/builtin/am.c b/builtin/am.c
index 24ad3e435..cb8e2b960 100644
--- a/builtin/am.c
+++ b/builtin/am.c
@@ -1763,7 +1763,7 @@ static void am_run(struct am_state *state, int resume)
refresh_and_write_cache();
- if (index_has_changes(&the_index, &sb)) {
+ if (index_has_changes(&the_index, NULL, &sb)) {
write_state_bool(state, "dirtyindex", 1);
die(_("Dirty index: cannot apply patches (dirty: %s)"), sb.buf);
}
@@ -1820,7 +1820,8 @@ static void am_run(struct am_state *state, int resume)
* Applying the patch to an earlier tree and merging
* the result may have produced the same tree as ours.
*/
- if (!apply_status && !index_has_changes(&the_index, NULL)) {
+ if (!apply_status &&
+ !index_has_changes(&the_index, NULL, NULL)) {
say(state, stdout, _("No changes -- Patch already applied."));
goto next;
}
@@ -1874,7 +1875,7 @@ static void am_resolve(struct am_state *state)
say(state, stdout, _("Applying: %.*s"), linelen(state->msg), state->msg);
- if (!index_has_changes(&the_index, NULL)) {
+ if (!index_has_changes(&the_index, NULL, NULL)) {
printf_ln(_("No changes - did you forget to use 'git add'?\n"
"If there is nothing left to stage, chances are that something else\n"
"already introduced the same changes; you might want to skip this patch."));
diff --git a/cache.h b/cache.h
index 125f2767a..b5a75806e 100644
--- a/cache.h
+++ b/cache.h
@@ -218,6 +218,7 @@ struct cache_entry {
/* Forward structure decls */
struct pathspec;
struct child_process;
+struct tree;
/*
* Copy the sha1 and stat state of a cache entry from one to
@@ -635,12 +636,14 @@ extern void move_index_extensions(struct index_state *dst, struct index_state *s
extern int unmerged_index(const struct index_state *);
/**
- * Returns 1 if istate differs from HEAD, 0 otherwise. When on an unborn
- * branch, returns 1 if there are entries in istate, 0 otherwise. If an
- * strbuf is provided, the space-separated list of files that differ will
- * be appended to it.
+ * Returns 1 if istate differs from tree, 0 otherwise. If tree is NULL,
+ * compares istate to HEAD. If tree is NULL and on an unborn branch,
+ * returns 1 if there are entries in istate, 0 otherwise. If an strbuf is
+ * provided, the space-separated list of files that differ will be appended
+ * to it.
*/
extern int index_has_changes(const struct index_state *istate,
+ struct tree *tree,
struct strbuf *sb);
extern int verify_path(const char *path, unsigned mode);
diff --git a/merge-recursive.c b/merge-recursive.c
index 9c0699be5..855ca39ca 100644
--- a/merge-recursive.c
+++ b/merge-recursive.c
@@ -3266,7 +3266,7 @@ int merge_trees(struct merge_options *o,
if (oid_eq(&common->object.oid, &merge->object.oid)) {
struct strbuf sb = STRBUF_INIT;
- if (!o->call_depth && index_has_changes(&the_index, &sb)) {
+ if (!o->call_depth && index_has_changes(&the_index, head, &sb)) {
err(o, _("Your local changes to the following files would be overwritten by merge:\n %s"),
sb.buf);
return -1;
diff --git a/read-cache.c b/read-cache.c
index ad3102083..acc8c390a 100644
--- a/read-cache.c
+++ b/read-cache.c
@@ -1986,22 +1986,26 @@ int unmerged_index(const struct index_state *istate)
return 0;
}
-int index_has_changes(const struct index_state *istate, struct strbuf *sb)
+int index_has_changes(const struct index_state *istate,
+ struct tree *tree,
+ struct strbuf *sb)
{
- struct object_id head;
+ struct object_id cmp;
int i;
if (istate != &the_index) {
BUG("index_has_changes cannot yet accept istate != &the_index; do_diff_cache needs updating first.");
}
- if (!get_oid_tree("HEAD", &head)) {
+ if (tree)
+ cmp = tree->object.oid;
+ if (tree || !get_oid_tree("HEAD", &cmp)) {
struct diff_options opt;
diff_setup(&opt);
opt.flags.exit_with_status = 1;
if (!sb)
opt.flags.quick = 1;
- do_diff_cache(&head, &opt);
+ do_diff_cache(&cmp, &opt);
diffcore_std(&opt);
for (i = 0; sb && i < diff_queued_diff.nr; i++) {
if (i)
diff --git a/t/t6044-merge-unrelated-index-changes.sh b/t/t6044-merge-unrelated-index-changes.sh
index 3876cfa4f..1d43712c5 100755
--- a/t/t6044-merge-unrelated-index-changes.sh
+++ b/t/t6044-merge-unrelated-index-changes.sh
@@ -126,7 +126,7 @@ test_expect_success 'recursive, when merge branch matches merge base' '
test_path_is_missing .git/MERGE_HEAD
'
-test_expect_failure 'merge-recursive, when index==head but head!=HEAD' '
+test_expect_success 'merge-recursive, when index==head but head!=HEAD' '
git reset --hard &&
git checkout C^0 &&
--
2.18.0.137.g2a11d05a6.dirty
