fast-import: prevent producing bad delta

diff --git a/tree-diff.c b/tree-diff.c
index 76f83fcc27e50b12ddbc8f72badd8d29f5b4230d..b3cc2e4753447d4734ed08a70e3396771257dced 100644 (file)
--- a/tree-diff.c
+++ b/tree-diff.c
@@ -64,23 +64,17 @@ static int compare_tree_entry(struct tree_desc *t1, struct tree_desc *t2,
 static void show_tree(struct diff_options *opt, const char *prefix,
                      struct tree_desc *desc, struct strbuf *base)
 {
-       int all_interesting = 0;
-       while (desc->size) {
-               int show;
-
-               if (all_interesting)
-                       show = 1;
-               else {
-                       show = tree_entry_interesting(&desc->entry, base, 0,
-                                                     &opt->pathspec);
-                       if (show == 2)
-                               all_interesting = 1;
+       int match = 0;
+       for (; desc->size; update_tree_entry(desc)) {
+               if (match != 2) {
+                       match = tree_entry_interesting(&desc->entry, base, 0,
+                                                      &opt->pathspec);
+                       if (match < 0)
+                               break;
+                       if (match == 0)
+                               continue;
                }
-               if (show < 0)
-                       break;
-               if (show)
-                       show_entry(opt, prefix, desc, base);
-               update_tree_entry(desc);
+               show_entry(opt, prefix, desc, base);
        }
 }
 
@@ -120,20 +114,16 @@ static void show_entry(struct diff_options *opt, const char *prefix,
 }
 
 static void skip_uninteresting(struct tree_desc *t, struct strbuf *base,
-                              struct diff_options *opt, int *all_interesting)
+                              struct diff_options *opt, int *match)
 {
        while (t->size) {
-               int show = tree_entry_interesting(&t->entry, base, 0, &opt->pathspec);
-               if (show == 2)
-                       *all_interesting = 1;
-               if (!show) {
-                       update_tree_entry(t);
-                       continue;
+               *match = tree_entry_interesting(&t->entry, base, 0, &opt->pathspec);
+               if (*match) {
+                       if (*match < 0)
+                               t->size = 0;
+                       break;
                }
-               /* Skip it all? */
-               if (show < 0)
-                       t->size = 0;
-               return;
+               update_tree_entry(t);
        }
 }
 
@@ -142,8 +132,7 @@ int diff_tree(struct tree_desc *t1, struct tree_desc *t2,
 {
        struct strbuf base;
        int baselen = strlen(base_str);
-       int all_t1_interesting = 0;
-       int all_t2_interesting = 0;
+       int t1_match = 0, t2_match = 0;
 
        /* Enable recursion indefinitely */
        opt->pathspec.recursive = DIFF_OPT_TST(opt, RECURSIVE);
@@ -153,14 +142,11 @@ int diff_tree(struct tree_desc *t1, struct tree_desc *t2,
        strbuf_add(&base, base_str, baselen);
 
        for (;;) {
-               if (DIFF_OPT_TST(opt, QUICK) &&
-                   DIFF_OPT_TST(opt, HAS_CHANGES))
+               if (diff_can_quit_early(opt))
                        break;
                if (opt->pathspec.nr) {
-                       if (!all_t1_interesting)
-                               skip_uninteresting(t1, &base, opt, &all_t1_interesting);
-                       if (!all_t2_interesting)
-                               skip_uninteresting(t2, &base, opt, &all_t2_interesting);
+                       skip_uninteresting(t1, &base, opt, &t1_match);
+                       skip_uninteresting(t2, &base, opt, &t2_match);
                }
                if (!t1->size) {
                        if (!t2->size)