Introduce --base=auto to record the base commit info automatically, the
base_commit will be the merge base of tip commit of the upstream branch
and revision-range specified in cmdline.
Helped-by: Junio C Hamano <gitster@xxxxxxxxx>
Helped-by: Wu Fengguang <fengguang.wu@xxxxxxxxx>
Signed-off-by: Xiaolong Ye <xiaolong.ye@xxxxxxxxx>
---
Documentation/git-format-patch.txt | 6 ++++++
builtin/log.c | 27 ++++++++++++++++++++++++---
t/t4014-format-patch.sh | 15 +++++++++++++++
3 files changed, 45 insertions(+), 3 deletions(-)
diff --git a/Documentation/git-format-patch.txt b/Documentation/git-format-patch.txt
index 1d790f1..bdeecd5 100644
--- a/Documentation/git-format-patch.txt
+++ b/Documentation/git-format-patch.txt
@@ -575,6 +575,12 @@ You can also use `git format-patch --base=P -3 C` to generate patches
for A, B and C, and the identifiers for P, X, Y, Z are appended at the
end of the first message.
+If set `--base=auto` in cmdline, it will track base commit automatically,
+the base commit will be the merge base of tip commit of the remote-tracking
+branch and revision-range specified in cmdline.
+For a local branch, you need to track a remote branch by `git branch
+--set-upstream-to` before using this option.
+
EXAMPLES
--------
diff --git a/builtin/log.c b/builtin/log.c
index ee332ab..7851d20 100644
--- a/builtin/log.c
+++ b/builtin/log.c
@@ -1205,9 +1205,30 @@ static struct commit *get_base_commit(const char *base_commit,
struct commit **rev;
int i = 0, rev_nr = 0;
- base = lookup_commit_reference_by_name(base_commit);
- if (!base)
- die(_("Unknown commit %s"), base_commit);
+ if (!strcmp(base_commit, "auto")) {
+ struct branch *curr_branch = branch_get(NULL);
+ const char *upstream = branch_get_upstream(curr_branch, NULL);
+ if (upstream) {
+ unsigned char sha1[20];
+ if (get_sha1(upstream, sha1))
+ die(_("Failed to resolve '%s' as a valid ref."), upstream);
+ struct commit *commit = lookup_commit_or_die(sha1, "upstream base");
+ struct commit_list *base_list = get_merge_bases_many(commit, total, list);
+ /* There should be one and only one merge base. */
+ if (!base_list || base_list->next)
+ die(_("Could not find exact merge base."));
+ base = base_list->item;
+ free_commit_list(base_list);
+ } else {
+ die(_("Failed to get upstream, if you want to record base commit automatically,\n"
+ "please use git branch --set-upstream-to to track a remote branch.\n"
+ "Or you could specify base commit by --base=<base-commit-id> manually."));
+ }
+ } else {
+ base = lookup_commit_reference_by_name(base_commit);
+ if (!base)
+ die(_("Unknown commit %s"), base_commit);
+ }
ALLOC_ARRAY(rev, total);
for (i = 0; i < total; i++)
diff --git a/t/t4014-format-patch.sh b/t/t4014-format-patch.sh
index a6ce727..afcf8b8 100755
--- a/t/t4014-format-patch.sh
+++ b/t/t4014-format-patch.sh
@@ -1475,4 +1475,19 @@ test_expect_success 'format-patch --base error handling' '
! git format-patch --base=HEAD~ -3
'
+test_expect_success 'format-patch --base=auto' '
+ git checkout -b new master &&
+ git branch --set-upstream-to=master &&
+ echo "A" >>file &&
+ git add file &&
+ git commit -m "New change #A" &&
+ echo "B" >>file &&
+ git add file &&
+ git commit -m "New change #B" &&
+ git format-patch --stdout --base=auto -2 >patch &&
+ grep -e "^base-commit:" patch >actual &&
+ echo "base-commit: $(git rev-parse master)" >expected &&
+ test_cmp expected actual
+'
+
test_done
--
2.8.1.221.ga4c6ba7
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