diff options
Diffstat (limited to 'merge-recursive.c')
| -rw-r--r-- | merge-recursive.c | 1079 |
1 files changed, 695 insertions, 384 deletions
diff --git a/merge-recursive.c b/merge-recursive.c index 0804eb44e7..6bbc4512a9 100644 --- a/merge-recursive.c +++ b/merge-recursive.c @@ -66,10 +66,12 @@ static int sha_eq(const unsigned char *a, const unsigned char *b) enum rename_type { RENAME_NORMAL = 0, RENAME_DELETE, - RENAME_ONE_FILE_TO_TWO + RENAME_ONE_FILE_TO_ONE, + RENAME_ONE_FILE_TO_TWO, + RENAME_TWO_FILES_TO_ONE }; -struct rename_df_conflict_info { +struct rename_conflict_info { enum rename_type rename_type; struct diff_filepair *pair1; struct diff_filepair *pair2; @@ -77,6 +79,8 @@ struct rename_df_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; }; /* @@ -88,34 +92,54 @@ struct stage_data { unsigned mode; unsigned char sha[20]; } stages[4]; - struct rename_df_conflict_info *rename_df_conflict_info; + struct rename_conflict_info *rename_conflict_info; unsigned processed:1; }; -static inline void setup_rename_df_conflict_info(enum rename_type rename_type, - struct diff_filepair *pair1, - struct diff_filepair *pair2, - const char *branch1, - const char *branch2, - struct stage_data *dst_entry1, - struct stage_data *dst_entry2) +static inline void setup_rename_conflict_info(enum rename_type rename_type, + struct diff_filepair *pair1, + struct diff_filepair *pair2, + const char *branch1, + const char *branch2, + struct stage_data *dst_entry1, + struct stage_data *dst_entry2, + struct merge_options *o, + struct stage_data *src_entry1, + struct stage_data *src_entry2) { - struct rename_df_conflict_info *ci = xcalloc(1, sizeof(struct rename_df_conflict_info)); + struct rename_conflict_info *ci = xcalloc(1, sizeof(struct rename_conflict_info)); ci->rename_type = rename_type; ci->pair1 = pair1; ci->branch1 = branch1; ci->branch2 = branch2; ci->dst_entry1 = dst_entry1; - dst_entry1->rename_df_conflict_info = ci; + dst_entry1->rename_conflict_info = ci; dst_entry1->processed = 0; assert(!pair2 == !dst_entry2); if (dst_entry2) { ci->dst_entry2 = dst_entry2; ci->pair2 = pair2; - dst_entry2->rename_df_conflict_info = ci; - dst_entry2->processed = 0; + 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; } } @@ -230,7 +254,7 @@ struct tree *write_tree_from_memory(struct merge_options *o) for (i = 0; i < active_nr; i++) { struct cache_entry *ce = active_cache[i]; if (ce_stage(ce)) - fprintf(stderr, "BUG: %d %.*s", ce_stage(ce), + fprintf(stderr, "BUG: %d %.*s\n", ce_stage(ce), (int)ce_namelen(ce), ce->name); } die("Bug in merge-recursive.c"); @@ -333,44 +357,90 @@ static struct string_list *get_unmerged(void) return unmerged; } -static void make_room_for_directories_of_df_conflicts(struct merge_options *o, - struct string_list *entries) +static int string_list_df_name_compare(const void *a, const void *b) { - /* If there are D/F conflicts, and the paths currently exist - * in the working copy as a file, we want to remove them to - * make room for the corresponding directory. Such paths will - * later be processed in process_df_entry() at the end. If - * the corresponding directory ends up being removed by the - * merge, then the file will be reinstated at that time; - * otherwise, if the file is not supposed to be removed by the - * merge, the contents of the file will be placed in another - * unique filename. + const struct string_list_item *one = a; + const struct string_list_item *two = b; + int onelen = strlen(one->string); + int twolen = strlen(two->string); + /* + * Here we only care that entries for D/F conflicts are + * adjacent, in particular with the file of the D/F conflict + * appearing before files below the corresponding directory. + * The order of the rest of the list is irrelevant for us. * - * NOTE: This function relies on the fact that entries for a - * D/F conflict will appear adjacent in the index, with the - * entries for the file appearing before entries for paths - * below the corresponding directory. + * To achieve this, we sort with df_name_compare and provide + * the mode S_IFDIR so that D/F conflicts will sort correctly. + * We use the mode S_IFDIR for everything else for simplicity, + * since in other cases any changes in their order due to + * sorting cause no problems for us. + */ + int cmp = df_name_compare(one->string, onelen, S_IFDIR, + two->string, twolen, S_IFDIR); + /* + * Now that 'foo' and 'foo/bar' compare equal, we have to make sure + * that 'foo' comes before 'foo/bar'. */ + if (cmp) + return cmp; + return onelen - twolen; +} + +static void record_df_conflict_files(struct merge_options *o, + struct string_list *entries) +{ + /* If there is a D/F conflict and the file for such a conflict + * currently exist in the working copy, we want to allow it to be + * removed to make room for the corresponding directory if needed. + * The files underneath the directories of such D/F conflicts will + * be processed before the corresponding file involved in the D/F + * conflict. If the D/F directory ends up being removed by the + * merge, then we won't have to touch the D/F file. If the D/F + * directory needs to be written to the working copy, then the D/F + * file will simply be removed (in make_room_for_path()) to make + * room for the necessary paths. Note that if both the directory + * and the file need to be present, then the D/F file will be + * reinstated with a new unique name at the time it is processed. + */ + struct string_list df_sorted_entries; const char *last_file = NULL; int last_len = 0; int i; + /* + * If we're merging merge-bases, we don't want to bother with + * any working directory changes. + */ + if (o->call_depth) + return; + + /* Ensure D/F conflicts are adjacent in the entries list. */ + memset(&df_sorted_entries, 0, sizeof(struct string_list)); for (i = 0; i < entries->nr; i++) { - const char *path = entries->items[i].string; + struct string_list_item *next = &entries->items[i]; + string_list_append(&df_sorted_entries, next->string)->util = + next->util; + } + qsort(df_sorted_entries.items, entries->nr, sizeof(*entries->items), + string_list_df_name_compare); + + string_list_clear(&o->df_conflict_file_set, 1); + for (i = 0; i < df_sorted_entries.nr; i++) { + const char *path = df_sorted_entries.items[i].string; int len = strlen(path); - struct stage_data *e = entries->items[i].util; + struct stage_data *e = df_sorted_entries.items[i].util; /* * Check if last_file & path correspond to a D/F conflict; * i.e. whether path is last_file+'/'+<something>. - * If so, remove last_file to make room for path and friends. + * If so, record that it's okay to remove last_file to make + * room for path and friends if needed. */ if (last_file && len > last_len && memcmp(path, last_file, last_len) == 0 && path[last_len] == '/') { - output(o, 3, "Removing %s to make room for subdirectory; may re-add later.", last_file); - unlink(last_file); + string_list_insert(&o->df_conflict_file_set, last_file); } /* @@ -386,6 +456,7 @@ static void make_room_for_directories_of_df_conflicts(struct merge_options *o, last_file = NULL; } } + string_list_clear(&df_sorted_entries, 0); } struct rename { @@ -461,10 +532,21 @@ static struct string_list *get_renames(struct merge_options *o, return renames; } -static int update_stages_options(const char *path, struct diff_filespec *o, - struct diff_filespec *a, struct diff_filespec *b, - int clear, int options) +static int update_stages(const char *path, const struct diff_filespec *o, + const struct diff_filespec *a, + const struct diff_filespec *b) { + + /* + * NOTE: It is usually a bad idea to call update_stages on a path + * before calling update_file on that same path, since it can + * sometimes lead to spurious "refusing to lose untracked file..." + * messages from update_file (via make_room_for path via + * would_lose_untracked). Instead, reverse the order of the calls + * (executing update_file first and then update_stages). + */ + int clear = 1; + int options = ADD_CACHE_OK_TO_ADD | ADD_CACHE_SKIP_DFCHECK; if (clear) if (remove_file_from_cache(path)) return -1; @@ -480,23 +562,11 @@ static int update_stages_options(const char *path, struct diff_filespec *o, return 0; } -static int update_stages(const char *path, struct diff_filespec *o, - struct diff_filespec *a, struct diff_filespec *b, - int clear) +static void update_entry(struct stage_data *entry, + struct diff_filespec *o, + struct diff_filespec *a, + struct diff_filespec *b) { - int options = ADD_CACHE_OK_TO_ADD | ADD_CACHE_OK_TO_REPLACE; - return update_stages_options(path, o, a, b, clear, options); -} - -static int update_stages_and_entry(const char *path, - struct stage_data *entry, - struct diff_filespec *o, - struct diff_filespec *a, - struct diff_filespec *b, - int clear) -{ - int options; - entry->processed = 0; entry->stages[1].mode = o->mode; entry->stages[2].mode = a->mode; @@ -504,8 +574,6 @@ static int update_stages_and_entry(const char *path, hashcpy(entry->stages[1].sha, o->sha1); hashcpy(entry->stages[2].sha, a->sha1); hashcpy(entry->stages[3].sha, b->sha1); - options = ADD_CACHE_OK_TO_ADD | ADD_CACHE_SKIP_DFCHECK; - return update_stages_options(path, o, a, b, clear, options); } static int remove_file(struct merge_options *o, int clean, @@ -563,7 +631,31 @@ static void flush_buffer(int fd, const char *buf, unsigned long size) } } -static int would_lose_untracked(const char *path) +static int dir_in_way(const char *path, int check_working_copy) +{ + int pos, pathlen = strlen(path); + char *dirpath = xmalloc(pathlen + 2); + struct stat st; + + strcpy(dirpath, path); + dirpath[pathlen] = '/'; + dirpath[pathlen+1] = '\0'; + + pos = cache_name_pos(dirpath, pathlen+1); + + if (pos < 0) + pos = -1 - pos; + if (pos < active_nr && + !strncmp(dirpath, active_cache[pos]->name, pathlen+1)) { + free(dirpath); + return 1; + } + + free(dirpath); + return check_working_copy && !lstat(path, &st) && S_ISDIR(st.st_mode); +} + +static int was_tracked(const char *path) { int pos = cache_name_pos(path, strlen(path)); @@ -580,18 +672,42 @@ static int would_lose_untracked(const char *path) switch (ce_stage(active_cache[pos])) { case 0: case 2: - return 0; + return 1; } pos++; } - return file_exists(path); + return 0; } -static int make_room_for_path(const char *path) +static int would_lose_untracked(const char *path) { - int status; + return !was_tracked(path) && file_exists(path); +} + +static int make_room_for_path(struct merge_options *o, const char *path) +{ + int status, i; const char *msg = "failed to create path '%s'%s"; + /* Unlink any D/F conflict files that are in the way */ + for (i = 0; i < o->df_conflict_file_set.nr; i++) { + const char *df_path = o->df_conflict_file_set.items[i].string; + size_t pathlen = strlen(path); + size_t df_pathlen = strlen(df_path); + if (df_pathlen < pathlen && + path[df_pathlen] == '/' && + strncmp(path, df_path, df_pathlen) == 0) { + output(o, 3, + "Removing %s to make room for subdirectory\n", + df_path); + unlink(df_path); + unsorted_string_list_delete_item(&o->df_conflict_file_set, + i, 0); + break; + } + } + + /* Make sure leading directories are created */ status = safe_create_leading_directories_const(path); if (status) { if (status == -3) { @@ -659,7 +775,7 @@ static void update_file_flags(struct merge_options *o, } } - if (make_room_for_path(path) < 0) { + if (make_room_for_path(o, path) < 0) { update_wd = 0; free(buf); goto update_index; @@ -712,9 +828,9 @@ struct merge_file_info { static int merge_3way(struct merge_options *o, mmbuffer_t *result_buf, - struct diff_filespec *one, - struct diff_filespec *a, - struct diff_filespec *b, + const struct diff_filespec *one, + const struct diff_filespec *a, + const struct diff_filespec *b, const char *branch1, const char *branch2) { @@ -771,12 +887,12 @@ static int merge_3way(struct merge_options *o, return merge_status; } -static struct merge_file_info merge_file(struct merge_options *o, - struct diff_filespec *one, - struct diff_filespec *a, - struct diff_filespec *b, - const char *branch1, - const char *branch2) +static struct merge_file_info merge_file_1(struct merge_options *o, + const struct diff_filespec *one, + const struct diff_filespec *a, + const struct diff_filespec *b, + const char *branch1, + const char *branch2) { struct merge_file_info result; result.merge = 0; @@ -845,94 +961,303 @@ static struct merge_file_info merge_file(struct merge_options *o, return result; } +static struct merge_file_info +merge_file_special_markers(struct merge_options *o, + const struct diff_filespec *one, + const struct diff_filespec *a, + const struct diff_filespec *b, + const char *branch1, + const char *filename1, + const char *branch2, + const char *filename2) +{ + char *side1 = NULL; + char *side2 = NULL; + struct merge_file_info mfi; + + if (filename1) { + side1 = xmalloc(strlen(branch1) + strlen(filename1) + 2); + sprintf(side1, "%s:%s", branch1, filename1); + } + if (filename2) { + side2 = xmalloc(strlen(branch2) + strlen(filename2) + 2); + sprintf(side2, "%s:%s", branch2, filename2); + } + + mfi = merge_file_1(o, one, a, b, + side1 ? side1 : branch1, side2 ? side2 : branch2); + free(side1); + free(side2); + return mfi; +} + +static struct merge_file_info merge_file(struct merge_options *o, + const char *path, + const unsigned char *o_sha, int o_mode, + const unsigned char *a_sha, int a_mode, + const unsigned char *b_sha, int b_mode, + const char *branch1, + const char *branch2) +{ + struct diff_filespec one, a, b; + + one.path = a.path = b.path = (char *)path; + hashcpy(one.sha1, o_sha); + one.mode = o_mode; + hashcpy(a.sha1, a_sha); + a.mode = a_mode; + hashcpy(b.sha1, b_sha); + b.mode = b_mode; + return merge_file_1(o, &one, &a, &b, branch1, branch2); +} + +static void handle_change_delete(struct merge_options *o, + const char *path, + const unsigned char *o_sha, int o_mode, + const unsigned char *a_sha, int a_mode, + const unsigned char *b_sha, int b_mode, + const char *change, const char *change_past) +{ + char *renamed = NULL; + if (dir_in_way(path, !o->call_depth)) { + renamed = unique_path(o, path, a_sha ? o->branch1 : o->branch2); + } + + if (o->call_depth) { + /* + * We cannot arbitrarily accept either a_sha or b_sha as + * correct; since there is no true "middle point" between + * them, simply reuse the base version for virtual merge base. + */ + remove_file_from_cache(path); + update_file(o, 0, o_sha, o_mode, renamed ? renamed : path); + } else if (!a_sha) { + output(o, 1, "CONFLICT (%s/delete): %s deleted in %s " + "and %s in %s. Version %s of %s left in tree%s%s.", + change, path, o->branch1, + change_past, o->branch2, o->branch2, path, + NULL == renamed ? "" : " at ", + NULL == renamed ? "" : renamed); + update_file(o, 0, b_sha, b_mode, renamed ? renamed : path); + } else { + output(o, 1, "CONFLICT (%s/delete): %s deleted in %s " + "and %s in %s. Version %s of %s left in tree%s%s.", + change, path, o->branch2, + change_past, o->branch1, o->branch1, path, + NULL == renamed ? "" : " at ", + NULL == renamed ? "" : renamed); + if (renamed) + update_file(o, 0, a_sha, a_mode, renamed); + /* + * No need to call update_file() on path when !renamed, since + * that would needlessly touch path. We could call + * update_file_flags() with update_cache=0 and update_wd=0, + * but that's a no-op. + */ + } + free(renamed); +} + static void conflict_rename_delete(struct merge_options *o, struct diff_filepair *pair, const char *rename_branch, const char *other_branch) { - char *dest_name = pair->two->path; - int df_conflict = 0; - struct stat st; + const struct diff_filespec *orig = pair->one; + const struct diff_filespec *dest = pair->two; + const unsigned char *a_sha = NULL; + const unsigned char *b_sha = NULL; + int a_mode = 0; + int b_mode = 0; + + if (rename_branch == o->branch1) { + a_sha = dest->sha1; + a_mode = dest->mode; + } else { + b_sha = dest->sha1; + b_mode = dest->mode; + } - output(o, 1, "CONFLICT (rename/delete): Rename %s->%s in %s " - "and deleted in %s", - pair->one->path, pair->two->path, rename_branch, - other_branch); - if (!o->call_depth) - update_stages(dest_name, NULL, - rename_branch == o->branch1 ? pair->two : NULL, - rename_branch == o->branch1 ? NULL : pair->two, - 1); - if (lstat(dest_name, &st) == 0 && S_ISDIR(st.st_mode)) { - dest_name = unique_path(o, dest_name, rename_branch); - df_conflict = 1; + handle_change_delete(o, + o->call_depth ? orig->path : dest->path, + orig->sha1, orig->mode, + a_sha, a_mode, + b_sha, b_mode, + "rename", "renamed"); + + if (o->call_depth) { + remove_file_from_cache(dest->path); + } else { + update_stages(dest->path, NULL, + rename_branch == o->branch1 ? dest : NULL, + rename_branch == o->branch1 ? NULL : dest); } - update_file(o, 0, pair->two->sha1, pair->two->mode, dest_name); - if (df_conflict) - free(dest_name); + } -static void conflict_rename_rename_1to2(struct merge_options *o, - struct diff_filepair *pair1, - const char *branch1, - struct diff_filepair *pair2, - const char *branch2) +static struct diff_filespec *filespec_from_entry(struct diff_filespec *target, + struct stage_data *entry, + int stage) { - /* One file was renamed in both branches, but to different names. */ - char *del[2]; - int delp = 0; - const char *ren1_dst = pair1->two->path; - const char *ren2_dst = pair2->two->path; - const char *dst_name1 = ren1_dst; - const char *dst_name2 = ren2_dst; - struct stat st; - if (lstat(ren1_dst, &st) == 0 && S_ISDIR(st.st_mode)) { - dst_name1 = del[delp++] = unique_path(o, ren1_dst, branch1); - output(o, 1, "%s is a directory in %s adding as %s instead", - ren1_dst, branch2, dst_name1); + unsigned char *sha = entry->stages[stage].sha; + unsigned mode = entry->stages[stage].mode; + if (mode == 0 || is_null_sha1(sha)) + return NULL; + hashcpy(target->sha1, sha); + target->mode = mode; + return target; +} + +static void handle_file(struct merge_options *o, + struct diff_filespec *rename, + int stage, + struct rename_conflict_info *ci) +{ + char *dst_name = rename->path; + struct stage_data *dst_entry; + const char *cur_branch, *other_branch; + struct diff_filespec other; + struct diff_filespec *add; + + if (stage == 2) { + dst_entry = ci->dst_entry1; + cur_branch = ci->branch1; + other_branch = ci->branch2; + } else { + dst_entry = ci->dst_entry2; + cur_branch = ci->branch2; + other_branch = ci->branch1; } - if (lstat(ren2_dst, &st) == 0 && S_ISDIR(st.st_mode)) { - dst_name2 = del[delp++] = unique_path(o, ren2_dst, branch2); - output(o, 1, "%s is a directory in %s adding as %s instead", - ren2_dst, branch1, dst_name2); + + add = filespec_from_entry(&other, dst_entry, stage ^ 1); + if (add) { + char *add_name = unique_path(o, rename->path, other_branch); + update_file(o, 0, add->sha1, add->mode, add_name); + + remove_file(o, 0, rename->path, 0); + dst_name = unique_path(o, rename->path, cur_branch); + } else { + if (dir_in_way(rename->path, !o->call_depth)) { + dst_name = unique_path(o, rename->path, cur_branch); + output(o, 1, "%s is a directory in %s adding as %s instead", + rename->path, other_branch, dst_name); + } } + update_file(o, 0, rename->sha1, rename->mode, dst_name); + if (stage == 2) + update_stages(rename->path, NULL, rename, add); + else + update_stages(rename->path, NULL, add, rename); + + if (dst_name != rename->path) + free(dst_name); +} + +static void conflict_rename_rename_1to2(struct merge_options *o, + struct rename_conflict_info *ci) +{ + /* One file was renamed in both branches, but to different names. */ + struct diff_filespec *one = ci->pair1->one; + struct diff_filespec *a = ci->pair1->two; + struct diff_filespec *b = ci->pair2->two; + + output(o, 1, "CONFLICT (rename/rename): " + "Rename \"%s\"->\"%s\" in branch \"%s\" " + "rename \"%s\"->\"%s\" in \"%s\"%s", + one->path, a->path, ci->branch1, + one->path, b->path, ci->branch2, + o->call_depth ? " (left unresolved)" : ""); if (o->call_depth) { - remove_file_from_cache(dst_name1); - remove_file_from_cache(dst_name2); + struct merge_file_info mfi; + struct diff_filespec other; + struct diff_filespec *add; + mfi = merge_file(o, one->path, + one->sha1, one->mode, + a->sha1, a->mode, + b->sha1, b->mode, + ci->branch1, ci->branch2); /* - * Uncomment to leave the conflicting names in the resulting tree - * - * update_file(o, 0, pair1->two->sha1, pair1->two->mode, dst_name1); - * update_file(o, 0, pair2->two->sha1, pair2->two->mode, dst_name2); + * FIXME: For rename/add-source conflicts (if we could detect + * such), this is wrong. We should instead find a unique + * pathname and then either rename the add-source file to that + * unique path, or use that unique path instead of src here. */ - } else { - update_stages(ren1_dst, NULL, pair1->two, NULL, 1); - update_stages(ren2_dst, NULL, NULL, pair2->two, 1); + update_file(o, 0, mfi.sha, mfi.mode, one->path); - update_file(o, 0, pair1->two->sha1, pair1->two->mode, dst_name1); - update_file(o, 0, pair2->two->sha1, pair2->two->mode, dst_name2); + /* + * Above, we put the merged content at the merge-base's + * path. Now we usually need to delete both a->path and + * b->path. However, the rename on each side of the merge + * could also be involved in a rename/add conflict. In + * such cases, we should keep the added file around, + * resolving the conflict at that path in its favor. + */ + add = filespec_from_entry(&other, ci->dst_entry1, 2 ^ 1); + if (add) + update_file(o, 0, add->sha1, add->mode, a->path); + else + remove_file_from_cache(a->path); + add = filespec_from_entry(&other, ci->dst_entry2, 3 ^ 1); + if (add) + update_file(o, 0, add->sha1, add->mode, b->path); + else + remove_file_from_cache(b->path); + } else { + handle_file(o, a, 2, ci); + handle_file(o, b, 3, ci); } - while (delp--) - free(del[delp]); } static void conflict_rename_rename_2to1(struct merge_options *o, - struct rename *ren1, - const char *branch1, - struct rename *ren2, - const char *branch2) + struct rename_conflict_info *ci) { - /* Two files were renamed to the same thing. */ - char *new_path1 = unique_path(o, ren1->pair->two->path, branch1); - char *new_path2 = unique_path(o, ren2->pair->two->path, branch2); - output(o, 1, "Renaming %s to %s and %s to %s instead", - ren1->pair->one->path, new_path1, - ren2->pair->one->path, new_path2); - remove_file(o, 0, ren1->pair->two->path, 0); - update_file(o, 0, ren1->pair->two->sha1, ren1->pair->two->mode, new_path1); - update_file(o, 0, ren2->pair->two->sha1, ren2->pair->two->mode, new_path2); - free(new_path2); - free(new_path1); + /* Two files, a & b, were renamed to the same thing, c. */ + struct diff_filespec *a = ci->pair1->one; + struct diff_filespec *b = ci->pair2->one; + struct diff_filespec *c1 = ci->pair1->two; + struct diff_filespec *c2 = ci->pair2->two; + char *path = c1->path; /* == c2->path */ + struct merge_file_info mfi_c1; + struct merge_file_info mfi_c2; + + output(o, 1, "CONFLICT (rename/rename): " + "Rename %s->%s in %s. " + "Rename %s->%s in %s", + a->path, c1->path, ci->branch1, + b->path, c2->path, ci->branch2); + + remove_file(o, 1, a->path, would_lose_untracked(a->path)); + remove_file(o, 1, b->path, would_lose_untracked(b->path)); + + mfi_c1 = merge_file_special_markers(o, a, c1, &ci->ren1_other, + o->branch1, c1->path, + o->branch2, ci->ren1_other.path); + mfi_c2 = merge_file_special_markers(o, b, &ci->ren2_other, c2, + o->branch1, ci->ren2_other.path, + o->branch2, c2->path); + + if (o->call_depth) { + /* + * If mfi_c1.clean && mfi_c2.clean, then it might make + * sense to do a two-way merge of those results. But, I + * think in all cases, it makes sense to have the virtual + * merge base just undo the renames; they can be detected + * again later for the non-recursive merge. + */ + remove_file(o, 0, path, 0); + update_file(o, 0, mfi_c1.sha, mfi_c1.mode, a->path); + update_file(o, 0, mfi_c2.sha, mfi_c2.mode, b->path); + } else { + char *new_path1 = unique_path(o, path, ci->branch1); + char *new_path2 = unique_path(o, path, ci->branch2); + output(o, 1, "Renaming %s to %s and %s to %s instead", + a->path, new_path1, b->path, new_path2); + remove_file(o, 0, path, 0); + update_file(o, 0, mfi_c1.sha, mfi_c1.mode, new_path1); + update_file(o, 0, mfi_c2.sha, mfi_c2.mode, new_path2); + free(new_path2); + free(new_path1); + } } static int process_renames(struct merge_options *o, @@ -947,12 +1272,12 @@ static int process_renames(struct merge_options *o, for (i = 0; i < a_renames->nr; i++) { sre = a_renames->items[i].util; string_list_insert(&a_by_dst, sre->pair->two->path)->util - = sre->dst_entry; + = (void *)sre; } for (i = 0; i < b_renames->nr; i++) { sre = b_renames->items[i].util; string_list_insert(&b_by_dst, sre->pair->two->path)->util - = sre->dst_entry; + = (void *)sre; } for (i = 0, j = 0; i < a_renames->nr || j < b_renames->nr;) { @@ -960,6 +1285,7 @@ static int process_renames(struct merge_options *o, struct rename *ren1 = NULL, *ren2 = NULL; const char *branch1, *branch2; const char *ren1_src, *ren1_dst; + struct string_list_item *lookup; if (i >= a_renames->nr) { ren2 = b_renames->items[j++].util; @@ -991,44 +1317,82 @@ static int process_renames(struct merge_options *o, ren1 = tmp; } - ren1->dst_entry->processed = 1; - ren1->src_entry->processed = 1; - if (ren1->processed) continue; ren1->processed = 1; + ren1->dst_entry->processed = 1; + /* BUG: We should only mark src_entry as processed if we + * are not dealing with a rename + add-source case. + */ + ren1->src_entry->processed = 1; ren1_src = ren1->pair->one->path; ren1_dst = ren1->pair->two->path; if (ren2) { + /* One file renamed on both sides */ const char *ren2_src = ren2->pair->one->path; const char *ren2_dst = ren2->pair->two->path; - /* Renamed in 1 and renamed in 2 */ + enum rename_type rename_type; if (strcmp(ren1_src, ren2_src) != 0) - die("ren1.src != ren2.src"); + die("ren1_src != ren2_src"); ren2->dst_entry->processed = 1; ren2->processed = 1; if (strcmp(ren1_dst, ren2_dst) != 0) { - setup_rename_df_conflict_info(RENAME_ONE_FILE_TO_TWO, - ren1->pair, - ren2->pair, - branch1, - branch2, - ren1->dst_entry, - ren2->dst_entry); + rename_type = RENAME_ONE_FILE_TO_TWO; + clean_merge = 0; } else { + rename_type = RENAME_ONE_FILE_TO_ONE; + /* BUG: We should only remove ren1_src in + * the base stage (think of rename + + * add-source cases). + */ remove_file(o, 1, ren1_src, 1); - update_stages_and_entry(ren1_dst, - ren1->dst_entry, - ren1->pair->one, - ren1->pair->two, - ren2->pair->two, - 1 /* clear */); + update_entry(ren1->dst_entry, + ren1->pair->one, + ren1->pair->two, + ren2->pair->two); } + setup_rename_conflict_info(rename_type, + ren1->pair, + ren2->pair, + branch1, + branch2, + ren1->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; + ren2 = lookup->util; + ren2_dst = ren2->pair->two->path; + if (strcmp(ren1_dst, ren2_dst) != 0) + die("ren1_dst != ren2_dst"); + + clean_merge = 0; + ren2->processed = 1; + /* + * BUG: We should only mark src_entry as processed + * if we are not dealing with a rename + add-source + * case. + */ + ren2->src_entry->processed = 1; + + setup_rename_conflict_info(RENAME_TWO_FILES_TO_ONE, + ren1->pair, + ren2->pair, + branch1, + branch2, + ren1->dst_entry, + ren2->dst_entry, + o, + ren1->src_entry, + ren2->src_entry); + } else { /* Renamed in 1, maybe changed in 2 */ - struct string_list_item *item; /* we only use sha1 and mode of these */ struct diff_filespec src_other, dst_other; int try_merge; @@ -1042,7 +1406,12 @@ static int process_renames(struct merge_options *o, int renamed_stage = a_renames == renames1 ? 2 : 3; int other_stage = a_renames == renames1 ? 3 : 2; - remove_file(o, 1, ren1_src, o->call_depth || renamed_stage == 2); + /* BUG: We should only remove ren1_src in the base + * stage and in other_stage (think of rename + + * add-source case). + */ + remove_file(o, 1, ren1_src, + renamed_stage == 2 || !was_tracked(ren1_src)); hashcpy(src_other.sha1, ren1->src_entry->stages[other_stage].sha); src_other.mode = ren1->src_entry->stages[other_stage].mode; @@ -1051,27 +1420,33 @@ static int process_renames(struct merge_options *o, try_merge = 0; if (sha_eq(src_other.sha1, null_sha1)) { - if (string_list_has_string(&o->current_directory_set, ren1_dst)) { - ren1->dst_entry->processed = 0; - setup_rename_df_conflict_info(RENAME_DELETE, - ren1->pair, - NULL, - branch1, - branch2, - ren1->dst_entry, - NULL); - } else { - clean_merge = 0; - conflict_rename_delete(o, ren1->pair, branch1, branch2); - } + setup_rename_conflict_info(RENAME_DELETE, + ren1->pair, + NULL, + 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)) { - /* Added file on the other side - identical to the file being - renamed: clean merge */ - update_file(o, 1, ren1->pair->two->sha1, ren1->pair->two->mode, ren1_dst); + /* + * Added file on the other side identical to + * the file being renamed: clean merge. + * Also, there is no need to overwrite the + * file already in the working copy, so call + * update_file_flags() instead of + * update_file(). + */ + update_file_flags(o, + ren1->pair->two->sha1, + ren1->pair->two->mode, + ren1_dst, + 1, /* update_cache */ + 0 /* update_wd */); } else if (!sha_eq(dst_other.sha1, null_sha1)) { - const char *new_path; clean_merge = 0; try_merge = 1; output(o, 1, "CONFLICT (rename/add): Rename %s->%s in %s. " @@ -1080,40 +1455,19 @@ static int process_renames(struct merge_options *o, ren1_dst, branch2); if (o->call_depth) { struct merge_file_info mfi; - struct diff_filespec one, a, b; - - one.path = a.path = b.path = - (char *)ren1_dst; - hashcpy(one.sha1, null_sha1); - one.mode = 0; - hashcpy(a.sha1, ren1->pair->two->sha1); - a.mode = ren1->pair->two->mode; - hashcpy(b.sha1, dst_other.sha1); - b.mode = dst_other.mode; - mfi = merge_file(o, &one, &a, &b, - branch1, - branch2); + mfi = merge_file(o, ren1_dst, null_sha1, 0, + ren1->pair->two->sha1, ren1->pair->two->mode, + dst_other.sha1, dst_other.mode, + branch1, branch2); output(o, 1, "Adding merged %s", ren1_dst); - update_file(o, 0, - mfi.sha, - mfi.mode, - ren1_dst); + update_file(o, 0, mfi.sha, mfi.mode, ren1_dst); try_merge = 0; } else { - new_path = unique_path(o, ren1_dst, branch2); + char *new_path = unique_path(o, ren1_dst, branch2); output(o, 1, "Adding as %s instead", new_path); update_file(o, 0, dst_other.sha1, dst_other.mode, new_path); + free(new_path); } - } else if ((item = string_list_lookup(renames2Dst, ren1_dst))) { - ren2 = item->util; - clean_merge = 0; - ren2->processed = 1; - output(o, 1, "CONFLICT (rename/rename): " - "Rename %s->%s in %s. " - "Rename %s->%s in %s", - ren1_src, ren1_dst, branch1, - ren2->pair->one->path, ren2->pair->two->path, branch2); - conflict_rename_rename_2to1(o, ren1, branch1, ren2, branch2); } else try_merge = 1; @@ -1129,16 +1483,17 @@ static int process_renames(struct merge_options *o, b = ren1->pair->two; a = &src_other; } - update_stages_and_entry(ren1_dst, ren1->dst_entry, one, a, b, 1); - if (string_list_has_string(&o->current_directory_set, ren1_dst)) { - setup_rename_df_conflict_info(RENAME_NORMAL, - ren1->pair, - NULL, - branch1, - NULL, - ren1->dst_entry, - NULL); - } + update_entry(ren1->dst_entry, one, a, b); + setup_rename_conflict_info(RENAME_NORMAL, + ren1->pair, + NULL, + branch1, + NULL, + ren1->dst_entry, + NULL, + o, + NULL, + NULL); } } } @@ -1200,29 +1555,18 @@ error_return: return ret; } -static void handle_delete_modify(struct merge_options *o, +static void handle_modify_delete(struct merge_options *o, const char *path, - const char *new_path, + unsigned char *o_sha, int o_mode, unsigned char *a_sha, int a_mode, unsigned char *b_sha, int b_mode) { - if (!a_sha) { - output(o, 1, "CONFLICT (delete/modify): %s deleted in %s " - "and modified in %s. Version %s of %s left in tree%s%s.", - path, o->branch1, - o->branch2, o->branch2, path, - path == new_path ? "" : " at ", - path == new_path ? "" : new_path); - update_file(o, 0, b_sha, b_mode, new_path); - } else { - output(o, 1, "CONFLICT (delete/modify): %s deleted in %s " - "and modified in %s. Version %s of %s left in tree%s%s.", - path, o->branch2, - o->branch1, o->branch1, path, - path == new_path ? "" : " at ", - path == new_path ? "" : new_path); - update_file(o, 0, a_sha, a_mode, new_path); - } + handle_change_delete(o, + path, + o_sha, o_mode, + a_sha, a_mode, + b_sha, b_mode, + "modify", "modified"); } static int merge_content(struct merge_options *o, @@ -1230,12 +1574,12 @@ static int merge_content(struct merge_options *o, unsigned char *o_sha, int o_mode, unsigned char *a_sha, int a_mode, unsigned char *b_sha, int b_mode, - const char *df_rename_conflict_branch) + struct rename_conflict_info *rename_conflict_info) { const char *reason = "content"; + const char *path1 = NULL, *path2 = NULL; struct merge_file_info mfi; struct diff_filespec one, a, b; - struct stat st; unsigned df_conflict_remains = 0; if (!o_sha) { @@ -1250,16 +1594,43 @@ static int merge_content(struct merge_options *o, hashcpy(b.sha1, b_sha); b.mode = b_mode; - mfi = merge_file(o, &one, &a, &b, o->branch1, o->branch2); - if (df_rename_conflict_branch && - lstat(path, &st) == 0 && S_ISDIR(st.st_mode)) { - df_conflict_remains = 1; + if (rename_conflict_info) { + struct diff_filepair *pair1 = rename_conflict_info->pair1; + + path1 = (o->branch1 == rename_conflict_info->branch1) ? + pair1->two->path : pair1->one->path; + /* If rename_conflict_info->pair2 != NULL, we are in + * RENAME_ONE_FILE_TO_ONE case. Otherwise, we have a + * normal rename. + */ + path2 = (rename_conflict_info->pair2 || + o->branch2 == rename_conflict_info->branch1) ? + pair1->two->path : pair1->one->path; + + if (dir_in_way(path, !o->call_depth)) + df_conflict_remains = 1; } + mfi = merge_file_special_markers(o, &one, &a, &b, + o->branch1, path1, + o->branch2, path2); if (mfi.clean && !df_conflict_remains && - sha_eq(mfi.sha, a_sha) && mfi.mode == a.mode) + sha_eq(mfi.sha, a_sha) && mfi.mode == a_mode) { + int path_renamed_outside_HEAD; output(o, 3, "Skipped %s (merged same as existing)", path); - else + /* + * The content merge resulted in the same file contents we + * already had. We can return early if those file contents + * are recorded at the correct path (which may not be true + * if the merge involves a rename). + */ + path_renamed_outside_HEAD = !path2 || !strcmp(path, path2); + if (!path_renamed_outside_HEAD) { + add_cacheinfo(mfi.mode, mfi.sha, path, + 0 /*stage*/, 1 /*refresh*/, 0 /*options*/); + return mfi.clean; + } + } else output(o, 2, "Auto-merging %s", path); if (!mfi.clean) { @@ -1267,16 +1638,34 @@ static int merge_content(struct merge_options *o, reason = "submodule"; output(o, 1, "CONFLICT (%s): Merge conflict in %s", reason, path); + if (rename_conflict_info && !df_conflict_remains) + update_stages(path, &one, &a, &b); } if (df_conflict_remains) { - const char *new_path; - update_file_flags(o, mfi.sha, mfi.mode, path, - o->call_depth || mfi.clean, 0); - new_path = unique_path(o, path, df_rename_conflict_branch); - mfi.clean = 0; + char *new_path; + if (o->call_depth) { + remove_file_from_cache(path); + } else { + if (!mfi.clean) + update_stages(path, &one, &a, &b); + else { + int file_from_stage2 = was_tracked(path); + struct diff_filespec merged; + hashcpy(merged.sha1, mfi.sha); + merged.mode = mfi.mode; + + update_stages(path, NULL, + file_from_stage2 ? &merged : NULL, + file_from_stage2 ? NULL : &merged); + } + + } + new_path = unique_path(o, path, rename_conflict_info->branch1); output(o, 1, "Adding as %s instead", new_path); - update_file_flags(o, mfi.sha, mfi.mode, new_path, 0, 1); + update_file(o, 0, mfi.sha, mfi.mode, new_path); + free(new_path); + mfi.clean = 0; } else { update_file(o, mfi.clean, mfi.sha, mfi.mode, path); } @@ -1301,104 +1690,15 @@ static int process_entry(struct merge_options *o, unsigned char *a_sha = stage_sha(entry->stages[2].sha, a_mode); unsigned char *b_sha = stage_sha(entry->stages[3].sha, b_mode); - if (entry->rename_df_conflict_info) - return 1; /* Such cases are handled elsewhere. */ - - entry->processed = 1; - if (o_sha && (!a_sha || !b_sha)) { - /* Case A: Deleted in one */ - if ((!a_sha && !b_sha) || - (!b_sha && blob_unchanged(o_sha, a_sha, normalize, path)) || - (!a_sha && blob_unchanged(o_sha, b_sha, normalize, path))) { - /* Deleted in both or deleted in one and - * unchanged in the other */ - if (a_sha) - output(o, 2, "Removing %s", path); - /* do not touch working file if it did not exist */ - remove_file(o, 1, path, !a_sha); - } else if (string_list_has_string(&o->current_directory_set, - path)) { - entry->processed = 0; - return 1; /* Assume clean until processed */ - } else { - /* Deleted in one and changed in the other */ - clean_merge = 0; - handle_delete_modify(o, path, path, - a_sha, a_mode, b_sha, b_mode); - } - - } else if ((!o_sha && a_sha && !b_sha) || - (!o_sha && !a_sha && b_sha)) { - /* Case B: Added in one. */ - unsigned mode; - const unsigned char *sha; - - if (a_sha) { - mode = a_mode; - sha = a_sha; - } else { - mode = b_mode; - sha = b_sha; - } - if (string_list_has_string(&o->current_directory_set, path)) { - /* Handle D->F conflicts after all subfiles */ - entry->processed = 0; - return 1; /* Assume clean until processed */ - } else { - output(o, 2, "Adding %s", path); - update_file(o, 1, sha, mode, path); - } - } else if (a_sha && b_sha) { - /* Case C: Added in both (check for same permissions) and */ - /* case D: Modified in both, but differently. */ - clean_merge = merge_content(o, path, - o_sha, o_mode, a_sha, a_mode, b_sha, b_mode, - NULL); - } else if (!o_sha && !a_sha && !b_sha) { - /* - * this entry was deleted altogether. a_mode == 0 means - * we had that path and want to actively remove it. - */ - remove_file(o, 1, path, !a_mode); - } else - die("Fatal merge failure, shouldn't happen."); - - return clean_merge; -} - -/* - * Per entry merge function for D/F (and/or rename) conflicts. In the - * cases we can cleanly resolve D/F conflicts, process_entry() can - * clean out all the files below the directory for us. All D/F - * conflict cases must be handled here at the end to make sure any - * directories that can be cleaned out, are. - * - * Some rename conflicts may also be handled here that don't necessarily - * involve D/F conflicts, since the code to handle them is generic enough - * to handle those rename conflicts with or without D/F conflicts also - * being involved. - */ -static int process_df_entry(struct merge_options *o, - const char *path, struct stage_data *entry) -{ - int clean_merge = 1; - unsigned o_mode = entry->stages[1].mode; - unsigned a_mode = entry->stages[2].mode; - unsigned b_mode = entry->stages[3].mode; - unsigned char *o_sha = stage_sha(entry->stages[1].sha, o_mode); - unsigned char *a_sha = stage_sha(entry->stages[2].sha, a_mode); - unsigned char *b_sha = stage_sha(entry->stages[3].sha, b_mode); - struct stat st; - entry->processed = 1; - if (entry->rename_df_conflict_info) { - struct rename_df_conflict_info *conflict_info = entry->rename_df_conflict_info; - char *src; + if (entry->rename_conflict_info) { + struct rename_conflict_info *conflict_info = entry->rename_conflict_info; switch (conflict_info->rename_type) { case RENAME_NORMAL: + case RENAME_ONE_FILE_TO_ONE: clean_merge = merge_content(o, path, o_sha, o_mode, a_sha, a_mode, b_sha, b_mode, - conflict_info->branch1); + conflict_info); break; case RENAME_DELETE: clean_merge = 0; @@ -1407,39 +1707,39 @@ static int process_df_entry(struct merge_options *o, conflict_info->branch2); break; case RENAME_ONE_FILE_TO_TWO: - src = conflict_info->pair1->one->path; clean_merge = 0; - output(o, 1, "CONFLICT (rename/rename): " - "Rename \"%s\"->\"%s\" in branch \"%s\" " - "rename \"%s\"->\"%s\" in \"%s\"%s", - src, conflict_info->pair1->two->path, conflict_info->branch1, - src, conflict_info->pair2->two->path, conflict_info->branch2, - o->call_depth ? " (left unresolved)" : ""); - if (o->call_depth) { - remove_file_from_cache(src); - update_file(o, 0, conflict_info->pair1->one->sha1, - conflict_info->pair1->one->mode, src); - } - conflict_rename_rename_1to2(o, conflict_info->pair1, - conflict_info->branch1, - conflict_info->pair2, - conflict_info->branch2); - conflict_info->dst_entry2->processed = 1; + conflict_rename_rename_1to2(o, conflict_info); + break; + case RENAME_TWO_FILES_TO_ONE: + clean_merge = 0; + conflict_rename_rename_2to1(o, conflict_info); break; default: entry->processed = 0; break; } } else if (o_sha && (!a_sha || !b_sha)) { - /* Modify/delete; deleted side may have put a directory in the way */ - const char *new_path = path; - if (lstat(path, &st) == 0 && S_ISDIR(st.st_mode)) - new_path = unique_path(o, path, a_sha ? o->branch1 : o->branch2); - clean_merge = 0; - handle_delete_modify(o, path, new_path, - a_sha, a_mode, b_sha, b_mode); - } else if (!o_sha && !!a_sha != !!b_sha) { - /* directory -> (directory, file) */ + /* Case A: Deleted in one */ + if ((!a_sha && !b_sha) || + (!b_sha && blob_unchanged(o_sha, a_sha, normalize, path)) || + (!a_sha && blob_unchanged(o_sha, b_sha, normalize, path))) { + /* Deleted in both or deleted in one and + * unchanged in the other */ + if (a_sha) + output(o, 2, "Removing %s", path); + /* do not touch working file if it did not exist */ + remove_file(o, 1, path, !a_sha); + } else { + /* Modify/delete; deleted side may have put a directory in the way */ + clean_merge = 0; + handle_modify_delete(o, path, o_sha, o_mode, + a_sha, a_mode, b_sha, b_mode); + } + } else if ((!o_sha && a_sha && !b_sha) || + (!o_sha && !a_sha && b_sha)) { + /* Case B: Added in one. */ + /* [nothing|directory] -> ([nothing|directory], file) */ + const char *add_branch; const char *other_branch; unsigned mode; @@ -1459,21 +1759,37 @@ static int process_df_entry(struct merge_options *o, sha = b_sha; conf = "directory/file"; } - if (lstat(path, &st) == 0 && S_ISDIR(st.st_mode)) { - const char *new_path = unique_path(o, path, add_branch); + if (dir_in_way(path, !o->call_depth)) { + char *new_path = unique_path(o, path, add_branch); clean_merge = 0; output(o, 1, "CONFLICT (%s): There is a directory with name %s in %s. " "Adding %s as %s", conf, path, other_branch, path, new_path); + if (o->call_depth) + remove_file_from_cache(path); update_file(o, 0, sha, mode, new_path); + if (o->call_depth) + remove_file_from_cache(path); + free(new_path); } else { output(o, 2, "Adding %s", path); - update_file(o, 1, sha, mode, path); + /* do not overwrite file if already present */ + update_file_flags(o, sha, mode, path, 1, !a_sha); } - } else { - entry->processed = 0; - return 1; /* not handled; assume clean until processed */ - } + } else if (a_sha && b_sha) { + /* Case C: Added in both (check for same permissions) and */ + /* case D: Modified in both, but differently. */ + clean_merge = merge_content(o, path, + o_sha, o_mode, a_sha, a_mode, b_sha, b_mode, + NULL); + } else if (!o_sha && !a_sha && !b_sha) { + /* + * this entry was deleted altogether. a_mode == 0 means + * we had that path and want to actively remove it. + */ + remove_file(o, 1, path, !a_mode); + } else + die("Fatal merge failure, shouldn't happen."); return clean_merge; } @@ -1517,11 +1833,11 @@ int merge_trees(struct merge_options *o, get_files_dirs(o, merge); entries = get_unmerged(); - make_room_for_directories_of_df_conflicts(o, entries); + record_df_conflict_files(o, entries); re_head = get_renames(o, head, common, head, merge, entries); re_merge = get_renames(o, merge, common, head, merge, entries); clean = process_renames(o, re_head, re_merge); - for (i = 0; i < entries->nr; i++) { + for (i = entries->nr-1; 0 <= i; i--) { const char *path = entries->items[i].string; struct stage_data *e = entries->items[i].util; if (!e->processed @@ -1529,13 +1845,6 @@ int merge_trees(struct merge_options *o, clean = 0; } for (i = 0; i < entries->nr; i++) { - const char *path = entries->items[i].string; - struct stage_data *e = entries->items[i].util; - if (!e->processed - && !process_df_entry(o, path, e)) - clean = 0; - } - for (i = 0; i < entries->nr; i++) { struct stage_data *e = entries->items[i].util; if (!e->processed) die("Unprocessed path??? %s", @@ -1741,6 +2050,8 @@ void init_merge_options(struct merge_options *o) o->current_file_set.strdup_strings = 1; memset(&o->current_directory_set, 0, sizeof(struct string_list)); o->current_directory_set.strdup_strings = 1; + memset(&o->df_conflict_file_set, 0, sizeof(struct string_list)); + o->df_conflict_file_set.strdup_strings = 1; } int parse_merge_opt(struct merge_options *o, const char *s) |