@@ -34,7 +34,7 @@ endif::git-diff[]
endif::git-format-patch[]
ifdef::git-log[]
---diff-merges=(off|none|on|first-parent|1|separate|m|combined|c|dense-combined|cc)::
+--diff-merges=(off|none|on|first-parent|1|separate|m|combined|c|dense-combined|cc|remerge|r)::
--no-diff-merges::
Specify diff format to be used for merge commits. Default is
{diff-merges-default} unless `--first-parent` is in use, in which case
@@ -64,6 +64,14 @@ ifdef::git-log[]
each of the parents. Separate log entry and diff is generated
for each parent.
+
+--diff-merges=remerge:::
+--diff-merges=r:::
+--remerge-diff:::
+ With this option, two-parent merge commits are remerged to
+ create a temporary tree object -- potentially containing files
+ with conflict markers and such. A diff is then shown between
+ that temporary tree and the actual merge commit.
++
--diff-merges=combined:::
--diff-merges=c:::
-c:::
@@ -35,6 +35,7 @@
#include "repository.h"
#include "commit-reach.h"
#include "range-diff.h"
+#include "tmp-objdir.h"
#define MAIL_DEFAULT_WRAP 72
#define COVER_FROM_AUTO_MAX_SUBJECT_LEN 100
@@ -406,6 +407,14 @@ static int cmd_log_walk(struct rev_info *rev)
struct commit *commit;
int saved_nrl = 0;
int saved_dcctc = 0;
+ struct tmp_objdir *remerge_objdir = NULL;
+
+ if (rev->remerge_diff) {
+ remerge_objdir = tmp_objdir_create("remerge-diff");
+ if (!remerge_objdir)
+ die(_("unable to create temporary object directory"));
+ tmp_objdir_replace_primary_odb(remerge_objdir, 1);
+ }
if (rev->early_output)
setup_early_output();
@@ -449,6 +458,9 @@ static int cmd_log_walk(struct rev_info *rev)
rev->diffopt.no_free = 0;
diff_free(&rev->diffopt);
+ if (rev->remerge_diff)
+ tmp_objdir_destroy(remerge_objdir);
+
if (rev->diffopt.output_format & DIFF_FORMAT_CHECKDIFF &&
rev->diffopt.flags.check_failed) {
return 02;
@@ -1943,6 +1955,8 @@ int cmd_format_patch(int argc, const char **argv, const char *prefix)
die(_("--name-status does not make sense"));
if (rev.diffopt.output_format & DIFF_FORMAT_CHECKDIFF)
die(_("--check does not make sense"));
+ if (rev.remerge_diff)
+ die(_("--remerge-diff does not make sense"));
if (!use_patch_format &&
(!rev.diffopt.output_format ||
@@ -17,6 +17,7 @@ static void suppress(struct rev_info *revs)
revs->combined_all_paths = 0;
revs->merges_imply_patch = 0;
revs->merges_need_diff = 0;
+ revs->remerge_diff = 0;
}
static void set_separate(struct rev_info *revs)
@@ -45,6 +46,12 @@ static void set_dense_combined(struct rev_info *revs)
revs->dense_combined_merges = 1;
}
+static void set_remerge_diff(struct rev_info *revs)
+{
+ suppress(revs);
+ revs->remerge_diff = 1;
+}
+
static diff_merges_setup_func_t func_by_opt(const char *optarg)
{
if (!strcmp(optarg, "off") || !strcmp(optarg, "none"))
@@ -57,6 +64,8 @@ static diff_merges_setup_func_t func_by_opt(const char *optarg)
return set_combined;
else if (!strcmp(optarg, "cc") || !strcmp(optarg, "dense-combined"))
return set_dense_combined;
+ else if (!strcmp(optarg, "r") || !strcmp(optarg, "remerge"))
+ return set_remerge_diff;
else if (!strcmp(optarg, "m") || !strcmp(optarg, "on"))
return set_to_default;
return NULL;
@@ -110,6 +119,9 @@ int diff_merges_parse_opts(struct rev_info *revs, const char **argv)
} else if (!strcmp(arg, "--cc")) {
set_dense_combined(revs);
revs->merges_imply_patch = 1;
+ } else if (!strcmp(arg, "--remerge-diff")) {
+ set_remerge_diff(revs);
+ revs->merges_imply_patch = 1;
} else if (!strcmp(arg, "--no-diff-merges")) {
suppress(revs);
} else if (!strcmp(arg, "--combined-all-paths")) {
@@ -1,4 +1,5 @@
#include "cache.h"
+#include "commit-reach.h"
#include "config.h"
#include "diff.h"
#include "object-store.h"
@@ -7,6 +8,7 @@
#include "tag.h"
#include "graph.h"
#include "log-tree.h"
+#include "merge-ort.h"
#include "reflog-walk.h"
#include "refs.h"
#include "string-list.h"
@@ -902,6 +904,51 @@ static int do_diff_combined(struct rev_info *opt, struct commit *commit)
return !opt->loginfo;
}
+static int do_remerge_diff(struct rev_info *opt,
+ struct commit_list *parents,
+ struct object_id *oid,
+ struct commit *commit)
+{
+ struct merge_options o;
+ struct commit_list *bases;
+ struct merge_result res = {0};
+ struct pretty_print_context ctx = {0};
+ struct commit *parent1 = parents->item;
+ struct commit *parent2 = parents->next->item;
+ struct strbuf parent1_desc = STRBUF_INIT;
+ struct strbuf parent2_desc = STRBUF_INIT;
+
+ /* Setup merge options */
+ init_merge_options(&o, the_repository);
+ o.show_rename_progress = 0;
+
+ ctx.abbrev = DEFAULT_ABBREV;
+ format_commit_message(parent1, "%h (%s)", &parent1_desc, &ctx);
+ format_commit_message(parent2, "%h (%s)", &parent2_desc, &ctx);
+ o.branch1 = parent1_desc.buf;
+ o.branch2 = parent2_desc.buf;
+
+ /* Parse the relevant commits and get the merge bases */
+ parse_commit_or_die(parent1);
+ parse_commit_or_die(parent2);
+ bases = get_merge_bases(parent1, parent2);
+
+ /* Re-merge the parents */
+ merge_incore_recursive(&o, bases, parent1, parent2, &res);
+
+ /* Show the diff */
+ diff_tree_oid(&res.tree->object.oid, oid, "", &opt->diffopt);
+ log_tree_diff_flush(opt);
+
+ /* Cleanup */
+ strbuf_release(&parent1_desc);
+ strbuf_release(&parent2_desc);
+ merge_finalize(&o, &res);
+ /* TODO: clean up the temporary object directory */
+
+ return !opt->loginfo;
+}
+
/*
* Show the diff of a commit.
*
@@ -936,6 +983,18 @@ static int log_tree_diff(struct rev_info *opt, struct commit *commit, struct log
}
if (is_merge) {
+ int octopus = (parents->next->next != NULL);
+
+ if (opt->remerge_diff) {
+ if (octopus) {
+ show_log(opt);
+ fprintf(opt->diffopt.file,
+ "diff: warning: Skipping remerge-diff "
+ "for octopus merges.\n");
+ return 1;
+ }
+ return do_remerge_diff(opt, parents, oid, commit);
+ }
if (opt->combine_merges)
return do_diff_combined(opt, commit);
if (opt->separate_merges) {
@@ -195,7 +195,8 @@ struct rev_info {
combine_merges:1,
combined_all_paths:1,
dense_combined_merges:1,
- first_parent_merges:1;
+ first_parent_merges:1,
+ remerge_diff:1;
/* Format info */
int show_notes;
new file mode 100755
@@ -0,0 +1,90 @@
+#!/bin/sh
+
+test_description='remerge-diff handling'
+
+. ./test-lib.sh
+
+# This test is ort-specific
+test "${GIT_TEST_MERGE_ALGORITHM:-ort}" = ort || {
+ skip_all="GIT_TEST_MERGE_ALGORITHM != ort"
+ test_done
+}
+
+test_expect_success 'setup basic merges' '
+ test_write_lines 1 2 3 4 5 6 7 8 9 >numbers &&
+ git add numbers &&
+ git commit -m base &&
+
+ git branch feature_a &&
+ git branch feature_b &&
+ git branch feature_c &&
+
+ git branch ab_resolution &&
+ git branch bc_resolution &&
+
+ git checkout feature_a &&
+ test_write_lines 1 2 three 4 5 6 7 eight 9 >numbers &&
+ git commit -a -m change_a &&
+
+ git checkout feature_b &&
+ test_write_lines 1 2 tres 4 5 6 7 8 9 >numbers &&
+ git commit -a -m change_b &&
+
+ git checkout feature_c &&
+ test_write_lines 1 2 3 4 5 6 7 8 9 10 >numbers &&
+ git commit -a -m change_c &&
+
+ git checkout bc_resolution &&
+ git merge --ff-only feature_b &&
+ # no conflict
+ git merge feature_c &&
+
+ git checkout ab_resolution &&
+ git merge --ff-only feature_a &&
+ # conflicts!
+ test_must_fail git merge feature_b &&
+ # Resolve conflict...and make another change elsewhere
+ test_write_lines 1 2 drei 4 5 6 7 acht 9 >numbers &&
+ git add numbers &&
+ git merge --continue
+'
+
+test_expect_success 'remerge-diff on a clean merge' '
+ git log -1 --oneline bc_resolution >expect &&
+ git show --oneline --remerge-diff bc_resolution >actual &&
+ test_cmp expect actual
+'
+
+test_expect_success 'remerge-diff with both a resolved conflict and an unrelated change' '
+ git log -1 --oneline ab_resolution >tmp &&
+ cat <<-EOF >>tmp &&
+ diff --git a/numbers b/numbers
+ index a1fb731..6875544 100644
+ --- a/numbers
+ +++ b/numbers
+ @@ -1,13 +1,9 @@
+ 1
+ 2
+ -<<<<<<< b0ed5cb (change_a)
+ -three
+ -=======
+ -tres
+ ->>>>>>> 6cd3f82 (change_b)
+ +drei
+ 4
+ 5
+ 6
+ 7
+ -eight
+ +acht
+ 9
+ EOF
+ # Hashes above are sha1; rip them out so test works with sha256
+ sed -e "s/[0-9a-f]\{7,\}/HASH/g" tmp >expect &&
+
+ git show --oneline --remerge-diff ab_resolution >tmp &&
+ sed -e "s/[0-9a-f]\{7,\}/HASH/g" tmp >actual &&
+ test_cmp expect actual
+'
+
+test_done