merge-recursive: Record more data needed for merging with dual renames

When two different files are renamed to one, we need to be able to do
three-way merges for both of those files.  To do that, we need to record
the sha1sum of the (possibly modified) file on the unrenamed side.  Modify
setup_rename_conflict_info() to take this extra information and record it
when the rename_type is RENAME_TWO_FILES_TO_ONE.

Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/merge-recursive.c b/merge-recursive.c
index ccb934356371f38ea989cb8912e6c3afb81cc8fb..27714c5bd7dc5060273400a25be0a5d67de59c49 100644 (file)
--- a/merge-recursive.c
+++ b/merge-recursive.c
@@ -79,6 +79,8 @@ struct rename_conflict_info {
        const char *branch2;
        struct stage_data *dst_entry1;
        struct stage_data *dst_entry2;
+       struct diff_filespec ren1_other;
+       struct diff_filespec ren2_other;
 };
 
 /*
@@ -100,7 +102,10 @@ static inline void setup_rename_conflict_info(enum rename_type rename_type,
                                              const char *branch1,
                                              const char *branch2,
                                              struct stage_data *dst_entry1,
-                                             struct stage_data *dst_entry2)
+                                             struct stage_data *dst_entry2,
+                                             struct merge_options *o,
+                                             struct stage_data *src_entry1,
+                                             struct stage_data *src_entry2)
 {
        struct rename_conflict_info *ci = xcalloc(1, sizeof(struct rename_conflict_info));
        ci->rename_type = rename_type;
@@ -118,6 +123,24 @@ static inline void setup_rename_conflict_info(enum rename_type rename_type,
                ci->pair2 = pair2;
                dst_entry2->rename_conflict_info = ci;
        }
+
+       if (rename_type == RENAME_TWO_FILES_TO_ONE) {
+               /*
+                * For each rename, there could have been
+                * modifications on the side of history where that
+                * file was not renamed.
+                */
+               int ostage1 = o->branch1 == branch1 ? 3 : 2;
+               int ostage2 = ostage1 ^ 1;
+
+               ci->ren1_other.path = pair1->one->path;
+               hashcpy(ci->ren1_other.sha1, src_entry1->stages[ostage1].sha);
+               ci->ren1_other.mode = src_entry1->stages[ostage1].mode;
+
+               ci->ren2_other.path = pair2->one->path;
+               hashcpy(ci->ren2_other.sha1, src_entry2->stages[ostage2].sha);
+               ci->ren2_other.mode = src_entry2->stages[ostage2].mode;
+       }
 }
 
 static int show(struct merge_options *o, int v)
@@ -1158,7 +1181,10 @@ static int process_renames(struct merge_options *o,
                                                   branch1,
                                                   branch2,
                                                   ren1->dst_entry,
-                                                  ren2->dst_entry);
+                                                  ren2->dst_entry,
+                                                  o,
+                                                  NULL,
+                                                  NULL);
                } else if ((lookup = string_list_lookup(renames2Dst, ren1_dst))) {
                        /* Two different files renamed to the same thing */
                        char *ren2_dst;
@@ -1182,7 +1208,11 @@ static int process_renames(struct merge_options *o,
                                                   branch1,
                                                   branch2,
                                                   ren1->dst_entry,
-                                                  ren2->dst_entry);
+                                                  ren2->dst_entry,
+                                                  o,
+                                                  ren1->src_entry,
+                                                  ren2->src_entry);
+
                } else {
                        /* Renamed in 1, maybe changed in 2 */
                        /* we only use sha1 and mode of these */
@@ -1218,6 +1248,9 @@ static int process_renames(struct merge_options *o,
                                                           branch1,
                                                           branch2,
                                                           ren1->dst_entry,
+                                                          NULL,
+                                                          o,
+                                                          NULL,
                                                           NULL);
                        } else if ((dst_other.mode == ren1->pair->two->mode) &&
                                   sha_eq(dst_other.sha1, ren1->pair->two->sha1)) {
@@ -1269,6 +1302,9 @@ static int process_renames(struct merge_options *o,
                                                           branch1,
                                                           NULL,
                                                           ren1->dst_entry,
+                                                          NULL,
+                                                          o,
+                                                          NULL,
                                                           NULL);
                        }
                }