merge-recursive: Fix code checking for D/F conflicts still being present

Previously, we were using lstat() to determine if a directory was still
present after a merge (and thus in the way of adding a file).  We should
have been using lstat() only to determine if untracked directories were in
the way (and then only when necessary to check for untracked directories);
we should instead using the index to determine if there is a tracked
directory in the way.  Create a new function to do this and use it to
replace the existing checks for directories being in the way.

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 7757e5f1634c69d20a5537dedeec385d7a44a43b..3515ece55a508068f0eb85f135eeb51cd21c7dab 100644 (file)
--- a/merge-recursive.c
+++ b/merge-recursive.c
@@ -591,6 +591,30 @@ static void flush_buffer(int fd, const char *buf, unsigned long size)
        }
 }
 
+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 would_lose_untracked(const char *path)
 {
        int pos = cache_name_pos(path, strlen(path));
@@ -880,7 +904,6 @@ static void conflict_rename_delete(struct merge_options *o,
 {
        char *dest_name = pair->two->path;
        int df_conflict = 0;
-       struct stat st;
 
        output(o, 1, "CONFLICT (rename/delete): Rename %s->%s in %s "
               "and deleted in %s",
@@ -890,7 +913,7 @@ static void conflict_rename_delete(struct merge_options *o,
                update_stages(dest_name, NULL,
                              rename_branch == o->branch1 ? pair->two : NULL,
                              rename_branch == o->branch1 ? NULL : pair->two);
-       if (lstat(dest_name, &st) == 0 && S_ISDIR(st.st_mode)) {
+       if (dir_in_way(dest_name, !o->call_depth)) {
                dest_name = unique_path(o, dest_name, rename_branch);
                df_conflict = 1;
        }
@@ -912,13 +935,12 @@ static void conflict_rename_rename_1to2(struct merge_options *o,
        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)) {
+       if (dir_in_way(ren1_dst, !o->call_depth)) {
                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);
        }
-       if (lstat(ren2_dst, &st) == 0 && S_ISDIR(st.st_mode)) {
+       if (dir_in_way(ren2_dst, !o->call_depth)) {
                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);
@@ -1078,7 +1100,7 @@ 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)) {
+                               if (dir_in_way(ren1_dst, 0 /*check_wc*/)) {
                                        ren1->dst_entry->processed = 0;
                                        setup_rename_df_conflict_info(RENAME_DELETE,
                                                                      ren1->pair,
@@ -1157,7 +1179,7 @@ static int process_renames(struct merge_options *o,
                                        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)) {
+                               if (dir_in_way(ren1_dst, 0 /*check_wc*/)) {
                                        setup_rename_df_conflict_info(RENAME_NORMAL,
                                                                      ren1->pair,
                                                                      NULL,
@@ -1262,7 +1284,6 @@ static int merge_content(struct merge_options *o,
        const char *reason = "content";
        struct merge_file_info mfi;
        struct diff_filespec one, a, b;
-       struct stat st;
        unsigned df_conflict_remains = 0;
 
        if (!o_sha) {
@@ -1279,7 +1300,7 @@ static int merge_content(struct merge_options *o,
 
        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)) {
+           dir_in_way(path, !o->call_depth)) {
                df_conflict_remains = 1;
        }
 
@@ -1344,8 +1365,7 @@ static int process_entry(struct merge_options *o,
                                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)) {
+               } else if (dir_in_way(path, 0 /*check_wc*/)) {
                        entry->processed = 0;
                        return 1; /* Assume clean until processed */
                } else {
@@ -1368,7 +1388,7 @@ static int process_entry(struct merge_options *o,
                        mode = b_mode;
                        sha = b_sha;
                }
-               if (string_list_has_string(&o->current_directory_set, path)) {
+               if (dir_in_way(path, 0 /*check_wc*/)) {
                        /* Handle D->F conflicts after all subfiles */
                        entry->processed = 0;
                        return 1; /* Assume clean until processed */
@@ -1416,7 +1436,6 @@ static int process_df_entry(struct merge_options *o,
        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) {
@@ -1461,7 +1480,7 @@ static int process_df_entry(struct merge_options *o,
        } else if (o_sha && (!a_sha || !b_sha)) {
                /* Modify/delete; deleted side may have put a directory in the way */
                char *renamed = NULL;
-               if (lstat(path, &st) == 0 && S_ISDIR(st.st_mode)) {
+               if (dir_in_way(path, !o->call_depth)) {
                        renamed = unique_path(o, path, a_sha ? o->branch1 : o->branch2);
                }
                clean_merge = 0;
@@ -1489,7 +1508,7 @@ 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)) {
+               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. "