diff options
authorJunio C Hamano <>2008-06-20 07:17:27 (GMT)
committerJunio C Hamano <>2009-11-30 07:11:46 (GMT)
commit73eb40eeaaebc5ebae283c06286b96b4aea00143 (patch)
parent44148f2daf6e1ac3fe087dd07da2930411b3bcf2 (diff)
git-merge-file --ours, --theirs
Sometimes people want their conflicting merges autoresolved by favouring upstream changes. The standard answer they are given is to run "git diff --name-only | xargs git checkout MERGE_HEAD --" in such a case. This is to accept automerge results for the paths that are fully resolved automatically, while taking their version of the file in full for paths that have conflicts. This is problematic on two counts. One is that this is not exactly what these people want. It discards all changes they did on their branch for any paths that conflicted. They usually want to salvage as much automerge result as possible in a conflicted file, and want to take the upstream change only in the conflicted part. This patch teaches two new modes of operation to the lowest-lever merge machinery, xdl_merge(). Instead of leaving the conflicted lines from both sides enclosed in <<<, ===, and >>> markers, the conflicts are resolved favouring our side or their side of changes. A larger problem is that this tends to encourage a bad workflow by allowing people to record such a mixed up half-merged result as a full commit without auditing. This commit does not tackle this issue at all. In git, we usually give long enough rope to users with strange wishes as long as the risky features are not enabled by default, and this is such a risky feature. Signed-off-by: Avery Pennarun <> Signed-off-by: Junio C Hamano <>
4 files changed, 34 insertions, 10 deletions
diff --git a/Documentation/git-merge-file.txt b/Documentation/git-merge-file.txt
index 3035373..b9d2276 100644
--- a/Documentation/git-merge-file.txt
+++ b/Documentation/git-merge-file.txt
@@ -10,7 +10,8 @@ SYNOPSIS
'git merge-file' [-L <current-name> [-L <base-name> [-L <other-name>]]]
- [-p|--stdout] [-q|--quiet] <current-file> <base-file> <other-file>
+ [--ours|--theirs] [-p|--stdout] [-q|--quiet]
+ <current-file> <base-file> <other-file>
@@ -34,7 +35,9 @@ normally outputs a warning and brackets the conflict with lines containing
>>>>>>> B
If there are conflicts, the user should edit the result and delete one of
-the alternatives.
+the alternatives. When `--ours` or `--theirs` option is in effect, however,
+these conflicts are resolved favouring lines from `<current-file>` or
+lines from `<other-file>` respectively.
The exit value of this program is negative on error, and the number of
conflicts otherwise. If the merge was clean, the exit value is 0.
@@ -62,6 +65,11 @@ OPTIONS
Quiet; do not warn about conflicts.
+ Instead of leaving conflicts in the file, resolve conflicts
+ favouring our (or their) side of the lines.
diff --git a/builtin-merge-file.c b/builtin-merge-file.c
index afd2ea7..1efc4e0 100644
--- a/builtin-merge-file.c
+++ b/builtin-merge-file.c
@@ -27,13 +27,18 @@ int cmd_merge_file(int argc, const char **argv, const char *prefix)
mmbuffer_t result = {NULL, 0};
xpparam_t xpp = {XDF_NEED_MINIMAL};
int ret = 0, i = 0, to_stdout = 0;
- int merge_level = XDL_MERGE_ZEALOUS_ALNUM;
- int merge_style = 0, quiet = 0;
+ int style = 0, quiet = 0;
+ int favor = 0;
int nongit;
struct option options[] = {
OPT_BOOLEAN('p', "stdout", &to_stdout, "send results to standard output"),
- OPT_SET_INT(0, "diff3", &merge_style, "use a diff3 based merge", XDL_MERGE_DIFF3),
+ OPT_SET_INT(0, "diff3", &style, "use a diff3 based merge", XDL_MERGE_DIFF3),
+ OPT_SET_INT(0, "ours", &favor, "for conflicts, use our version",
+ OPT_SET_INT(0, "theirs", &favor, "for conflicts, use their version",
OPT_CALLBACK('L', NULL, names, "name",
"set labels for file1/orig_file/file2", &label_cb),
@@ -45,7 +50,7 @@ int cmd_merge_file(int argc, const char **argv, const char *prefix)
/* Read the configuration file */
git_config(git_xmerge_config, NULL);
if (0 <= git_xmerge_style)
- merge_style = git_xmerge_style;
+ style = git_xmerge_style;
argc = parse_options(argc, argv, prefix, options, merge_file_usage, 0);
@@ -68,7 +73,7 @@ int cmd_merge_file(int argc, const char **argv, const char *prefix)
ret = xdl_merge(mmfs + 1, mmfs + 0, names[0], mmfs + 2, names[2],
- &xpp, merge_level | merge_style, &result);
+ &xpp, XDL_MERGE_FLAGS(level, style, favor), &result);
for (i = 0; i < 3; i++)
diff --git a/xdiff/xdiff.h b/xdiff/xdiff.h
index 4da052a..8a0efed 100644
--- a/xdiff/xdiff.h
+++ b/xdiff/xdiff.h
@@ -58,6 +58,12 @@ extern "C" {
+/* merge favor modes */
+#define XDL_MERGE_FAVOR(flags) (((flags)>>4) & 3)
+#define XDL_MERGE_FLAGS(level, style, favor) ((level)|(style)|((favor)<<4))
/* merge output styles */
#define XDL_MERGE_DIFF3 0x8000
#define XDL_MERGE_STYLE_MASK 0x8000
@@ -110,7 +116,7 @@ int xdl_diff(mmfile_t *mf1, mmfile_t *mf2, xpparam_t const *xpp,
int xdl_merge(mmfile_t *orig, mmfile_t *mf1, const char *name1,
mmfile_t *mf2, const char *name2,
- xpparam_t const *xpp, int level, mmbuffer_t *result);
+ xpparam_t const *xpp, int flags, mmbuffer_t *result);
#ifdef __cplusplus
diff --git a/xdiff/xmerge.c b/xdiff/xmerge.c
index 1cb65a9..b2ddc75 100644
--- a/xdiff/xmerge.c
+++ b/xdiff/xmerge.c
@@ -214,11 +214,15 @@ static int fill_conflict_hunk(xdfenv_t *xe1, const char *name1,
static int xdl_fill_merge_buffer(xdfenv_t *xe1, const char *name1,
xdfenv_t *xe2, const char *name2,
+ int favor,
xdmerge_t *m, char *dest, int style)
int size, i;
for (size = i = 0; m; m = m->next) {
+ if (favor && !m->mode)
+ m->mode = favor;
if (m->mode == 0)
size = fill_conflict_hunk(xe1, name1, xe2, name2,
size, i, style, m, dest);
@@ -391,6 +395,7 @@ static int xdl_do_merge(xdfenv_t *xe1, xdchange_t *xscr1, const char *name1,
int i0, i1, i2, chg0, chg1, chg2;
int level = flags & XDL_MERGE_LEVEL_MASK;
int style = flags & XDL_MERGE_STYLE_MASK;
+ int favor = XDL_MERGE_FAVOR(flags);
if (style == XDL_MERGE_DIFF3) {
@@ -523,14 +528,14 @@ static int xdl_do_merge(xdfenv_t *xe1, xdchange_t *xscr1, const char *name1,
/* output */
if (result) {
int size = xdl_fill_merge_buffer(xe1, name1, xe2, name2,
- changes, NULL, style);
+ favor, changes, NULL, style);
result->ptr = xdl_malloc(size);
if (!result->ptr) {
return -1;
result->size = size;
- xdl_fill_merge_buffer(xe1, name1, xe2, name2, changes,
+ xdl_fill_merge_buffer(xe1, name1, xe2, name2, favor, changes,
result->ptr, style);
return xdl_cleanup_merge(changes);