From: Elijah Newren <newren@gmail.com>
To: git@vger.kernel.org
Cc: jrnieder@gmail.com, Elijah Newren <newren@gmail.com>
Subject: [RFC PATCH 4/7] merge-recursive: fix assumption that head tree being merged is HEAD
Date: Sat, 2 Jun 2018 23:58:07 -0700 [thread overview]
Message-ID: <20180603065810.23841-5-newren@gmail.com> (raw)
In-Reply-To: <20180603065810.23841-1-newren@gmail.com>
`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.
We modify index_has_changes() to take an extra argument specifying the
tree to compare the index to. 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@gmail.com>
---
I'm really unsure where the index_has_changes() declaration should go;
I stuck it in tree.h, but is there a better spot?
builtin/am.c | 6 +++---
cache.h | 8 --------
merge-recursive.c | 2 +-
merge.c | 10 ++++++----
t/t6044-merge-unrelated-index-changes.sh | 2 +-
tree.h | 8 ++++++++
6 files changed, 19 insertions(+), 17 deletions(-)
diff --git a/builtin/am.c b/builtin/am.c
index 2fc2d1e82c..c5b76cd095 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(&sb)) {
+ if (index_has_changes(&sb, NULL)) {
write_state_bool(state, "dirtyindex", 1);
die(_("Dirty index: cannot apply patches (dirty: %s)"), sb.buf);
}
@@ -1820,7 +1820,7 @@ 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(NULL)) {
+ if (!apply_status && !index_has_changes(NULL, NULL)) {
say(state, stdout, _("No changes -- Patch already applied."));
goto next;
}
@@ -1878,7 +1878,7 @@ static void am_resolve(struct am_state *state)
say(state, stdout, _("Applying: %.*s"), linelen(state->msg), state->msg);
- if (!index_has_changes(NULL)) {
+ if (!index_has_changes(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 89a107a7f7..439b9d9f6e 100644
--- a/cache.h
+++ b/cache.h
@@ -634,14 +634,6 @@ extern int discard_index(struct index_state *);
extern void move_index_extensions(struct index_state *dst, struct index_state *src);
extern int unmerged_index(const struct index_state *);
-/**
- * Returns 1 if the index differs from HEAD, 0 otherwise. When on an unborn
- * branch, returns 1 if there are entries in the index, 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(struct strbuf *sb);
-
extern int verify_path(const char *path, unsigned mode);
extern int strcmp_offset(const char *s1, const char *s2, size_t *first_change);
extern int index_dir_exists(struct index_state *istate, const char *name, int namelen);
diff --git a/merge-recursive.c b/merge-recursive.c
index b3deb7b182..762aa087d0 100644
--- a/merge-recursive.c
+++ b/merge-recursive.c
@@ -3263,7 +3263,7 @@ 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(&sb)) {
+ if (!o->call_depth && index_has_changes(&sb, head)) {
err(o, _("Your local changes to the following files would be overwritten by merge:\n %s"),
sb.buf);
return -1;
diff --git a/merge.c b/merge.c
index 0783858739..965d287646 100644
--- a/merge.c
+++ b/merge.c
@@ -14,19 +14,21 @@ static const char *merge_argument(struct commit *commit)
return oid_to_hex(commit ? &commit->object.oid : the_hash_algo->empty_tree);
}
-int index_has_changes(struct strbuf *sb)
+int index_has_changes(struct strbuf *sb, struct tree *tree)
{
- struct object_id head;
+ struct object_id cmp;
int i;
- 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 3876cfa4fa..1d43712c52 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 &&
diff --git a/tree.h b/tree.h
index e2a80be4ef..2e1d8ea720 100644
--- a/tree.h
+++ b/tree.h
@@ -37,4 +37,12 @@ extern int read_tree_recursive(struct tree *tree,
extern int read_tree(struct tree *tree, int stage, struct pathspec *pathspec,
struct index_state *istate);
+/**
+ * Returns 1 if the index differs from tree, 0 otherwise. If tree is NULL,
+ * compares to HEAD. If tree is NULL and on an unborn branch, returns 1 if
+ * there are entries in the index, 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(struct strbuf *sb, struct tree *tree);
+
#endif /* TREE_H */
--
2.18.0.rc0.49.g3c08dc0fef
next prev parent reply other threads:[~2018-06-03 6:58 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-06-03 6:58 [RFC PATCH 0/7] merge requirement: index matches head Elijah Newren
2018-06-03 6:58 ` [RFC PATCH 1/7] t6044: verify that merges expected to abort actually abort Elijah Newren
2018-06-03 6:58 ` [RFC PATCH 2/7] t6044: add a testcase for index matching head, when head doesn't match HEAD Elijah Newren
2018-06-03 6:58 ` [RFC PATCH 3/7] merge-recursive: make sure when we say we abort that we actually abort Elijah Newren
2018-06-03 6:58 ` Elijah Newren [this message]
2018-06-03 13:52 ` [RFC PATCH 4/7] merge-recursive: fix assumption that head tree being merged is HEAD Ramsay Jones
2018-06-03 23:37 ` brian m. carlson
2018-06-04 2:26 ` Ramsay Jones
2018-06-04 3:19 ` Junio C Hamano
2018-06-05 7:14 ` Elijah Newren
2018-06-11 16:15 ` Elijah Newren
2018-06-03 6:58 ` [RFC PATCH 5/7] t6044: add more testcases with staged changes before a merge is invoked Elijah Newren
2018-06-03 6:58 ` [RFC PATCH 6/7] merge-recursive: enforce rule that index matches head before merging Elijah Newren
2018-06-03 6:58 ` [RFC PATCH 7/7] merge: fix misleading pre-merge check documentation Elijah Newren
2018-06-07 5:27 ` Elijah Newren
2018-07-01 1:24 ` [PATCH v2 0/9] Fix merge issues with index not matching HEAD Elijah Newren
2018-07-01 1:24 ` [PATCH v2 1/9] read-cache.c: move index_has_changes() from merge.c Elijah Newren
2018-07-01 1:24 ` [PATCH v2 2/9] index_has_changes(): avoid assuming operating on the_index Elijah Newren
2018-07-03 19:44 ` Junio C Hamano
2018-07-01 1:24 ` [PATCH v2 3/9] t6044: verify that merges expected to abort actually abort Elijah Newren
2018-07-01 1:24 ` [PATCH v2 4/9] t6044: add a testcase for index matching head, when head doesn't match HEAD Elijah Newren
2018-07-10 20:39 ` SZEDER Gábor
2018-07-11 3:09 ` [RFC PATCH 2/7] " Elijah Newren
2018-07-01 1:24 ` [PATCH v2 5/9] merge-recursive: make sure when we say we abort that we actually abort Elijah Newren
2018-07-01 1:25 ` [PATCH v2 6/9] merge-recursive: fix assumption that head tree being merged is HEAD Elijah Newren
2018-07-03 19:57 ` Junio C Hamano
2018-07-01 1:25 ` [PATCH v2 7/9] t6044: add more testcases with staged changes before a merge is invoked Elijah Newren
2018-07-01 1:25 ` [PATCH v2 8/9] merge-recursive: enforce rule that index matches head before merging Elijah Newren
2018-07-03 20:05 ` Junio C Hamano
2018-07-01 1:25 ` [PATCH v2 9/9] merge: fix misleading pre-merge check documentation Elijah Newren
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