git-add--interactive: Improve behavior on bogus input

diff --git a/builtin-rm.c b/builtin-rm.c
index 4a0bd93c8b3b644fb86ce05686b09d79b180bffc..9a808c1bf96ec52d836b0a69816f6118f0291a45 100644 (file)
--- a/builtin-rm.c
+++ b/builtin-rm.c
@@ -46,7 +46,7 @@ static int remove_file(const char *name)
        return ret;
 }
 
-static int check_local_mod(unsigned char *head)
+static int check_local_mod(unsigned char *head, int index_only)
 {
        /* items in list are already sorted in the cache order,
         * so we could do this a lot more efficiently by using
@@ -65,6 +65,8 @@ static int check_local_mod(unsigned char *head)
                const char *name = list.name[i];
                unsigned char sha1[20];
                unsigned mode;
+               int local_changes = 0;
+               int staged_changes = 0;
 
                pos = cache_name_pos(name, strlen(name));
                if (pos < 0)
@@ -87,14 +89,32 @@ static int check_local_mod(unsigned char *head)
                        continue;
                }
                if (ce_match_stat(ce, &st, 0))
-                       errs = error("'%s' has local modifications "
-                                    "(hint: try -f)", ce->name);
+                       local_changes = 1;
                if (no_head
                     || get_tree_entry(head, name, sha1, &mode)
                     || ce->ce_mode != create_ce_mode(mode)
                     || hashcmp(ce->sha1, sha1))
-                       errs = error("'%s' has changes staged in the index "
-                                    "(hint: try -f)", name);
+                       staged_changes = 1;
+
+               if (local_changes && staged_changes)
+                       errs = error("'%s' has staged content different "
+                                    "from both the file and the HEAD\n"
+                                    "(use -f to force removal)", name);
+               else if (!index_only) {
+                       /* It's not dangerous to git-rm --cached a
+                        * file if the index matches the file or the
+                        * HEAD, since it means the deleted content is
+                        * still available somewhere.
+                        */
+                       if (staged_changes)
+                               errs = error("'%s' has changes staged in the index\n"
+                                            "(use --cached to keep the file, "
+                                            "or -f to force removal)", name);
+                       if (local_changes)
+                               errs = error("'%s' has local modifications\n"
+                                            "(use --cached to keep the file, "
+                                            "or -f to force removal)", name);
+               }
        }
        return errs;
 }
@@ -192,7 +212,7 @@ int cmd_rm(int argc, const char **argv, const char *prefix)
                unsigned char sha1[20];
                if (get_sha1("HEAD", sha1))
                        hashclr(sha1);
-               if (check_local_mod(sha1))
+               if (check_local_mod(sha1, index_only))
                        exit(1);
        }