Don't crash fast-import if the marks cannot be exported.
[gitweb.git] / merge-base.c
index 0b99598f305593de5d48e6cbafcbdea359349c45..385f4ba386ada3e43f962d9051cf4b651320fcd3 100644 (file)
@@ -1,95 +1,53 @@
-#include <stdlib.h>
 #include "cache.h"
 #include "commit.h"
 
-static struct commit *process_list(struct commit_list **list_p, int this_mark,
-                                  int other_mark)
-{
-       struct commit_list *parent, *temp;
-       struct commit_list *posn = *list_p;
-       *list_p = NULL;
-       while (posn) {
-               parse_commit(posn->item);
-               if (posn->item->object.flags & this_mark) {
-                       /*
-                         printf("%d already seen %s %x\n",
-                         this_mark
-                         sha1_to_hex(posn->parent->sha1),
-                         posn->parent->flags);
-                       */
-                       /* do nothing; this indicates that this side
-                        * split and reformed, and we only need to
-                        * mark it once.
-                        */
-               } else if (posn->item->object.flags & other_mark) {
-                       return posn->item;
-               } else {
-                       /*
-                         printf("%d based on %s\n",
-                         this_mark,
-                         sha1_to_hex(posn->parent->sha1));
-                       */
-                       posn->item->object.flags |= this_mark;
-                       
-                       parent = posn->item->parents;
-                       while (parent) {
-                               temp = malloc(sizeof(struct commit_list));
-                               temp->next = *list_p;
-                               temp->item = parent->item;
-                               *list_p = temp;
-                               parent = parent->next;
-                       }
-               }
-               posn = posn->next;
-       }
-       return NULL;
-}
+static int show_all;
 
-struct commit *common_ancestor(struct commit *rev1, struct commit *rev2)
+static int merge_base(struct commit *rev1, struct commit *rev2)
 {
-       struct commit_list *rev1list = malloc(sizeof(struct commit_list));
-       struct commit_list *rev2list = malloc(sizeof(struct commit_list));
+       struct commit_list *result = get_merge_bases(rev1, rev2, 0);
 
-       rev1list->item = rev1;
-       rev1list->next = NULL;
-
-       rev2list->item = rev2;
-       rev2list->next = NULL;
+       if (!result)
+               return 1;
 
-       while (rev1list || rev2list) {
-               struct commit *ret;
-               ret = process_list(&rev1list, 0x1, 0x2);
-               if (ret) {
-                       /* XXXX free lists */
-                       return ret;
-               }
-               ret = process_list(&rev2list, 0x2, 0x1);
-               if (ret) {
-                       /* XXXX free lists */
-                       return ret;
-               }
+       while (result) {
+               printf("%s\n", sha1_to_hex(result->item->object.sha1));
+               if (!show_all)
+                       return 0;
+               result = result->next;
        }
-       return NULL;
+
+       return 0;
 }
 
+static const char merge_base_usage[] =
+"git-merge-base [--all] <commit-id> <commit-id>";
+
 int main(int argc, char **argv)
 {
-       struct commit *rev1, *rev2, *ret;
+       struct commit *rev1, *rev2;
        unsigned char rev1key[20], rev2key[20];
 
-       if (argc != 3 ||
-           get_sha1_hex(argv[1], rev1key) ||
-           get_sha1_hex(argv[2], rev2key)) {
-               usage("merge-base <commit-id> <commit-id>");
+       setup_git_directory();
+       git_config(git_default_config);
+
+       while (1 < argc && argv[1][0] == '-') {
+               char *arg = argv[1];
+               if (!strcmp(arg, "-a") || !strcmp(arg, "--all"))
+                       show_all = 1;
+               else
+                       usage(merge_base_usage);
+               argc--; argv++;
        }
-       rev1 = lookup_commit(rev1key);
-       rev2 = lookup_commit(rev2key);
-       ret = common_ancestor(rev1, rev2);
-       if (ret) {
-               printf("%s\n", sha1_to_hex(ret->object.sha1));
-               return 0;
-       } else {
+       if (argc != 3)
+               usage(merge_base_usage);
+       if (get_sha1(argv[1], rev1key))
+               die("Not a valid object name %s", argv[1]);
+       if (get_sha1(argv[2], rev2key))
+               die("Not a valid object name %s", argv[2]);
+       rev1 = lookup_commit_reference(rev1key);
+       rev2 = lookup_commit_reference(rev2key);
+       if (!rev1 || !rev2)
                return 1;
-       }
-       
+       return merge_base(rev1, rev2);
 }