Add merge.ff flag to support turning off fast-forward merges by default.
This flag is overridden if any branch.x.mergeoptions turn it back on.
Documentation/merge-config.txt | 6 ++++++
builtin/merge.c | 3 +++
2 files changed, 9 insertions(+), 0 deletions(-)
Signed-off-by: Junio C Hamano <gitster@xxxxxxxxx>
Reported-by: Michael Grubb <devel@xxxxxxxxxxxxx>
---
Documentation/merge-config.txt | 6 ++++++
builtin/merge.c | 3 +++
t/t7600-merge.sh | 23 +++++++++++++++++++++++
3 files changed, 32 insertions(+), 0 deletions(-)
diff --git a/Documentation/merge-config.txt b/Documentation/merge-config.txt
index 8920258..2aa4408 100644
--- a/Documentation/merge-config.txt
+++ b/Documentation/merge-config.txt
@@ -16,6 +16,12 @@ merge.defaultToUpstream::
to their corresponding remote tracking branches, and the tips of
these tracking branches are merged.
+merge.ff::
+ Do not generate a merge commit if the merge resolved as a
+ fast-forward; only update the branch pointer instead. Setting
+ this to `false` would be equivalent to giving `--no-ff` from
+ the command line.
+
merge.log::
In addition to branch names, populate the log message with at
most the specified number of one-line descriptions from the
diff --git a/builtin/merge.c b/builtin/merge.c
index d171c63..5194f04 100644
--- a/builtin/merge.c
+++ b/builtin/merge.c
@@ -541,6 +541,9 @@ static int git_merge_config(const char *k, const char *v, void *cb)
if (is_bool && shortlog_len)
shortlog_len = DEFAULT_MERGE_LOG_LEN;
return 0;
+ } else if (!strcmp(k, "merge.ff")) {
+ allow_fast_forward = git_config_bool(k, v);
+ return 0;
} else if (!strcmp(k, "merge.defaulttoupstream")) {
default_to_upstream = git_config_bool(k, v);
return 0;
diff --git a/t/t7600-merge.sh b/t/t7600-merge.sh
index e84e822..21c25d4 100755
--- a/t/t7600-merge.sh
+++ b/t/t7600-merge.sh
@@ -415,6 +415,29 @@ test_expect_success 'merge c0 with c1 (no-ff)' '
test_debug 'git log --graph --decorate --oneline --all'
+test_expect_success 'merge c0 with c1 (merge.ff=false)' '
+ git reset --hard c0 &&
+ git config merge.ff false &&
+ test_tick &&
+ git merge c1 &&
+ git config --remove-section merge &&
+ verify_merge file result.1 &&
+ verify_parents $c0 $c1
+'
+test_debug 'git log --graph --decorate --oneline --all'
+
+test_expect_success 'combine branch.master.mergeoptions with merge.ff' '
+ git reset --hard c0 &&
+ git config branch.master.mergeoptions --ff
+ git config merge.ff false
+ test_tick &&
+ git merge c1 &&
+ git config --remove-section "branch.master" &&
+ git config --remove-section "merge" &&
+ verify_merge file result.1 &&
+ verify_parents "$c0"
+'
+
test_expect_success 'combining --squash and --no-ff is refused' '
test_must_fail git merge --squash --no-ff c1 &&
test_must_fail git merge --no-ff --squash c1
--
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