apply: get rid of --index-info in favor of --build-fake-ancestor

diff --git a/builtin-apply.c b/builtin-apply.c
index 86d89a4a7e9240a75e1500bba524acdcec7f14d2..6777231c665044a486c16fd7fb11b53ed83a0474 100644 (file)
--- a/builtin-apply.c
+++ b/builtin-apply.c
@@ -41,7 +41,7 @@ static int apply_in_reverse;
 static int apply_with_reject;
 static int apply_verbosely;
 static int no_add;
-static int show_index_info;
+static const char *fake_ancestor;
 static int line_termination = '\n';
 static unsigned long p_context = ULONG_MAX;
 static const char apply_usage[] =
@@ -2248,9 +2248,12 @@ static int get_current_sha1(const char *path, unsigned char *sha1)
        return 0;
 }
 
-static void show_index_list(struct patch *list)
+/* Build an index that contains the just the files needed for a 3way merge */
+static void build_fake_ancestor(struct patch *list, const char *filename)
 {
        struct patch *patch;
+       struct index_state result = { 0 };
+       int fd;
 
        /* Once we start supporting the reverse patch, it may be
         * worth showing the new sha1 prefix, but until then...
@@ -2258,11 +2261,12 @@ static void show_index_list(struct patch *list)
        for (patch = list; patch; patch = patch->next) {
                const unsigned char *sha1_ptr;
                unsigned char sha1[20];
+               struct cache_entry *ce;
                const char *name;
 
                name = patch->old_name ? patch->old_name : patch->new_name;
                if (0 < patch->is_new)
-                       sha1_ptr = null_sha1;
+                       continue;
                else if (get_sha1(patch->old_sha1_prefix, sha1))
                        /* git diff has no index line for mode/type changes */
                        if (!patch->lines_added && !patch->lines_deleted) {
@@ -2277,13 +2281,16 @@ static void show_index_list(struct patch *list)
                else
                        sha1_ptr = sha1;
 
-               printf("%06o %s ",patch->old_mode, sha1_to_hex(sha1_ptr));
-               if (line_termination && quote_c_style(name, NULL, NULL, 0))
-                       quote_c_style(name, NULL, stdout, 0);
-               else
-                       fputs(name, stdout);
-               putchar(line_termination);
+               ce = make_cache_entry(patch->old_mode, sha1_ptr, name, 0, 0);
+               if (add_index_entry(&result, ce, ADD_CACHE_OK_TO_ADD))
+                       die ("Could not add %s to temporary index", name);
        }
+
+       fd = open(filename, O_WRONLY | O_CREAT, 0666);
+       if (fd < 0 || write_index(&result, fd) || close(fd))
+               die ("Could not write temporary index to %s", filename);
+
+       discard_index(&result);
 }
 
 static void stat_patch_list(struct patch *patch)
@@ -2803,8 +2810,8 @@ static int apply_patch(int fd, const char *filename, int inaccurate_eof)
        if (apply && write_out_results(list, skipped_patch))
                exit(1);
 
-       if (show_index_info)
-               show_index_list(list);
+       if (fake_ancestor)
+               build_fake_ancestor(list, fake_ancestor);
 
        if (diffstat)
                stat_patch_list(list);
@@ -2912,9 +2919,11 @@ int cmd_apply(int argc, const char **argv, const char *unused_prefix)
                        apply = 1;
                        continue;
                }
-               if (!strcmp(arg, "--index-info")) {
+               if (!strcmp(arg, "--build-fake-ancestor")) {
                        apply = 0;
-                       show_index_info = 1;
+                       if (++i >= argc)
+                               die ("need a filename");
+                       fake_ancestor = argv[i];
                        continue;
                }
                if (!strcmp(arg, "-z")) {