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pull: should be noop when already-up-to-date

PATCH In review Erwin Villejo via GitGitGadget 2 participants 2 messages Nov 17, 2021 – Nov 18, 2021

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Erwin Villejo via GitGitGadget

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#0 lore raw

PATCH 1/1 pull: should be noop when already-up-to-date

From: Erwin Villejo <[email protected]>

The already-up-to-date pull bug was fixed for --ff-only but it did not include the case where --ff or --ff-only are not specified. This updates the --ff-only fix to include the case where --ff or --ff-only are not specified in command line flags or config.

Signed-off-by Erwin Villejo <[email protected]>

---
pull: should be noop when already-up-to-date

The already-up-to-date pull bug was fixed for --ff-only but it did not include the case where --ff or --ff-only are not specified. This updates the --ff-only fix to include the case where --ff or --ff-only are not specified in command line flags or config.

Signed-off-by Erwin Villejo [email protected]

Published-As: https://github.com/gitgitgadget/git/releases/tag/pr-1078%2Ferwinv%2Fmaster-v1
Fetch-It-Via: git fetch https://github.com/gitgitgadget/git pr-1078/erwinv/master-v1
Pull-Request: https://github.com/gitgitgadget/git/pull/1078

 builtin/pull.c               | 6 ++++--
 t/t7601-merge-pull-config.sh | 6 ++++++
 2 files changed, 10 insertions(+), 2 deletions(-)
builtin/pull.c +4 -2
index 127798ba84e..1cfaf9f3436 100644
@@ -988,6 +988,7 @@ int cmd_pull(int argc, const char **argv, const char *prefix)
 	struct object_id rebase_fork_point;
 	int rebase_unspecified = 0;
 	int can_ff;
+	int divergent;
 
 	if (!getenv("GIT_REFLOG_ACTION"))
 		set_reflog_message(argc, argv);

@@ -1102,15 +1103,16 @@ int cmd_pull(int argc, const char **argv, const char *prefix)
 	}
 
 	can_ff = get_can_ff(&orig_head, &merge_heads);
+	divergent = !can_ff && !already_up_to_date(&orig_head, &merge_heads);
 
 	/* ff-only takes precedence over rebase */
 	if (opt_ff && !strcmp(opt_ff, "--ff-only")) {
-		if (!can_ff && !already_up_to_date(&orig_head, &merge_heads))
+		if (divergent)
 			die_ff_impossible();
 		opt_rebase = REBASE_FALSE;
 	}
 	/* If no action specified and we can't fast forward, then warn. */
-	if (!opt_ff && rebase_unspecified && !can_ff) {
+	if (!opt_ff && rebase_unspecified && divergent) {
 		show_advice_pull_non_ff();
 		die(_("Need to specify how to reconcile divergent branches."));
 	}
t/t7601-merge-pull-config.sh +6 -0
index 6275641b9c2..bd238d89b0c 100755
@@ -387,6 +387,12 @@ test_expect_success 'pull prevents non-fast-forward with "only" in pull.ff' '
 	test_must_fail git pull . c3
 '
 
+test_expect_success 'already-up-to-date pull succeeds with unspecified pull.ff' '
+	git reset --hard c1 &&
+	git pull . c0 &&
+	test "$(git rev-parse HEAD)" = "$(git rev-parse c1)"
+'
+
 test_expect_success 'already-up-to-date pull succeeds with "only" in pull.ff' '
 	git reset --hard c1 &&
 	test_config pull.ff only &&

base-commit: cd3e606211bb1cf8bc57f7d76bab98cc17a150bc

Signature · 1 line
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#1 lore raw
Quoted 19 lines · Erwin Villejo via GitGitGadget

From: Erwin Villejo <[email protected]>

The already-up-to-date pull bug was fixed for --ff-only but it did not include the case where --ff or --ff-only are not specified. This updates the --ff-only fix to include the case where --ff or --ff-only are not specified in command line flags or config.

Signed-off-by Erwin Villejo <[email protected]>

---

builtin/pull.c +1 -1
@@ -1102,15 +1103,16 @@ int cmd_pull(int argc, const char **argv, const char *prefix)
 	}
 
 	can_ff = get_can_ff(&orig_head, &merge_heads);
+	divergent = !can_ff && !already_up_to_date(&orig_head, &merge_heads);
 
 	/* ff-only takes precedence over rebase */
 	if (opt_ff && !strcmp(opt_ff, "--ff-only")) {
-		if (!can_ff && !already_up_to_date(&orig_head, &merge_heads))

builtin/pull.c int cmd_pull(int argc, const char **argv, const char *prefix) · line 1118

Quoted 10 lines
builtin/pull.c +2 -1
+		if (divergent)
 			die_ff_impossible();
 		opt_rebase = REBASE_FALSE;
 	}
 	/* If no action specified and we can't fast forward, then warn. */
-	if (!opt_ff && rebase_unspecified && !can_ff) {
+	if (!opt_ff && rebase_unspecified && divergent) {
 		show_advice_pull_non_ff();
 		die(_("Need to specify how to reconcile divergent branches."));
 	}

Looks correct. I wonder if there is a simplify these two checks, but let's keep the original code structure for now in this step, which is about correctness.

Will apply. Thanks.

Quoted 19 lines
t/t7601-merge-pull-config.sh +6 -0
index 6275641b9c2..bd238d89b0c 100755
@@ -387,6 +387,12 @@ test_expect_success 'pull prevents non-fast-forward with "only" in pull.ff' '
 	test_must_fail git pull . c3
 '
 
+test_expect_success 'already-up-to-date pull succeeds with unspecified pull.ff' '
+	git reset --hard c1 &&
+	git pull . c0 &&
+	test "$(git rev-parse HEAD)" = "$(git rev-parse c1)"
+'
+
 test_expect_success 'already-up-to-date pull succeeds with "only" in pull.ff' '
 	git reset --hard c1 &&
 	test_config pull.ff only &&

base-commit: cd3e606211bb1cf8bc57f7d76bab98cc17a150bc