shallow.c

   1 #include "cache.h"
   2 #include "commit.h"
   3 #include "tag.h"
   4
   5 static int is_shallow = -1;
   6
   7 int register_shallow(const unsigned char *sha1)
   8 {
   9         struct commit_graft *graft =
  10                 xmalloc(sizeof(struct commit_graft));
  11         struct commit *commit = lookup_commit(sha1);
  12
  13         hashcpy(graft->sha1, sha1);
  14         graft->nr_parent = -1;
  15         if (commit && commit->object.parsed)
  16                 commit->parents = NULL;
  17         return register_commit_graft(graft, 0);
  18 }
  19
  20 int is_repository_shallow()
  21 {
  22         FILE *fp;
  23         char buf[1024];
  24
  25         if (is_shallow >= 0)
  26                 return is_shallow;
  27
  28         fp = fopen(git_path("shallow"), "r");
  29         if (!fp) {
  30                 is_shallow = 0;
  31                 return is_shallow;
  32         }
  33         is_shallow = 1;
  34
  35         while (fgets(buf, sizeof(buf), fp)) {
  36                 unsigned char sha1[20];
  37                 if (get_sha1_hex(buf, sha1))
  38                         die("bad shallow line: %s", buf);
  39                 register_shallow(sha1);
  40         }
  41         fclose(fp);
  42         return is_shallow;
  43 }
  44
  45 struct commit_list *get_shallow_commits(struct object_array *heads, int depth,
  46                 int shallow_flag, int not_shallow_flag)
  47 {
  48         int i = 0, cur_depth = 0;
  49         struct commit_list *result = NULL;
  50         struct object_array stack = {0, 0, NULL};
  51         struct commit *commit = NULL;
  52
  53         while (commit || i < heads->nr || stack.nr) {
  54                 struct commit_list *p;
  55                 if (!commit) {
  56                         if (i < heads->nr) {
  57                                 commit = (struct commit *)
  58                                         deref_tag(heads->objects[i++].item, NULL, 0);
  59                                 if (commit->object.type != OBJ_COMMIT) {
  60                                         commit = NULL;
  61                                         continue;
  62                                 }
  63                                 if (!commit->util)
  64                                         commit->util = xmalloc(sizeof(int));
  65                                 *(int *)commit->util = 0;
  66                                 cur_depth = 0;
  67                         } else {
  68                                 commit = (struct commit *)
  69                                         stack.objects[--stack.nr].item;
  70                                 cur_depth = *(int *)commit->util;
  71                         }
  72                 }
  73                 parse_commit(commit);
  74                 commit->object.flags |= not_shallow_flag;
  75                 cur_depth++;
  76                 for (p = commit->parents, commit = NULL; p; p = p->next) {
  77                         if (!p->item->util) {
  78                                 int *pointer = xmalloc(sizeof(int));
  79                                 p->item->util = pointer;
  80                                 *pointer =  cur_depth;
  81                         } else {
  82                                 int *pointer = p->item->util;
  83                                 if (cur_depth >= *pointer)
  84                                         continue;
  85                                 *pointer = cur_depth;
  86                         }
  87                         if (cur_depth < depth) {
  88                                 if (p->next)
  89                                         add_object_array(&p->item->object,
  90                                                         NULL, &stack);
  91                                 else {
  92                                         commit = p->item;
  93                                         cur_depth = *(int *)commit->util;
  94                                 }
  95                         } else {
  96                                 commit_list_insert(p->item, &result);
  97                                 p->item->object.flags |= shallow_flag;
  98                         }
  99                 }
 100         }
 101
 102         return result;
 103 }
 104