fetch.c

   1 #include "fetch.h"
   2
   3 #include "cache.h"
   4 #include "commit.h"
   5 #include "tree.h"
   6 #include "tag.h"
   7 #include "blob.h"
   8 #include "refs.h"
   9
  10 const char *write_ref = NULL;
  11
  12 const unsigned char *current_ref = NULL;
  13
  14 int get_tree = 0;
  15 int get_history = 0;
  16 int get_all = 0;
  17 int get_verbosely = 0;
  18 static unsigned char current_commit_sha1[20];
  19
  20 void pull_say(const char *fmt, const char *hex)
  21 {
  22         if (get_verbosely)
  23                 fprintf(stderr, fmt, hex);
  24 }
  25
  26 static void report_missing(const char *what, const unsigned char *missing)
  27 {
  28         char missing_hex[41];
  29
  30         strcpy(missing_hex, sha1_to_hex(missing));;
  31         fprintf(stderr,
  32                 "Cannot obtain needed %s %s\nwhile processing commit %s.\n",
  33                 what, missing_hex, sha1_to_hex(current_commit_sha1));
  34 }
  35
  36 static int make_sure_we_have_it(const char *what, unsigned char *sha1)
  37 {
  38         int status = 0;
  39
  40         if (!has_sha1_file(sha1)) {
  41                 status = fetch(sha1);
  42                 if (status && what)
  43                         report_missing(what, sha1);
  44         }
  45         return status;
  46 }
  47
  48 static int process(unsigned char *sha1, const char *type);
  49
  50 static int process_tree(struct tree *tree)
  51 {
  52         struct tree_entry_list *entries;
  53
  54         if (parse_tree(tree))
  55                 return -1;
  56
  57         for (entries = tree->entries; entries; entries = entries->next) {
  58                 if (process(entries->item.any->sha1,
  59                             entries->directory ? tree_type : blob_type))
  60                         return -1;
  61         }
  62         return 0;
  63 }
  64
  65 struct commit_list *complete = NULL;
  66
  67 static int process_commit(struct commit *commit)
  68 {
  69         if (parse_commit(commit))
  70                 return -1;
  71
  72         while (complete && complete->item->date >= commit->date) {
  73                 pop_most_recent_commit(&complete, 1);
  74         }
  75
  76
  77         if (commit->object.flags & 1)
  78                 return 0;
  79
  80         memcpy(current_commit_sha1, commit->object.sha1, 20);
  81
  82         if (get_tree) {
  83                 if (process(commit->tree->object.sha1, tree_type))
  84                         return -1;
  85                 if (!get_all)
  86                         get_tree = 0;
  87         }
  88         if (get_history) {
  89                 struct commit_list *parents = commit->parents;
  90                 for (; parents; parents = parents->next) {
  91                         if (process(parents->item->object.sha1,
  92                                     commit_type))
  93                                 return -1;
  94                 }
  95         }
  96         return 0;
  97 }
  98
  99 static int process_tag(struct tag *tag)
 100 {
 101         if (parse_tag(tag))
 102                 return -1;
 103         return process(tag->tagged->sha1, NULL);
 104 }
 105
 106 static struct object_list *process_queue = NULL;
 107 static struct object_list **process_queue_end = &process_queue;
 108
 109 static int process_object(struct object *obj)
 110 {
 111         if (obj->type == commit_type) {
 112                 if (process_commit((struct commit *)obj))
 113                         return -1;
 114                 return 0;
 115         }
 116         if (obj->type == tree_type) {
 117                 if (process_tree((struct tree *)obj))
 118                         return -1;
 119                 return 0;
 120         }
 121         if (obj->type == blob_type) {
 122                 return 0;
 123         }
 124         if (obj->type == tag_type) {
 125                 if (process_tag((struct tag *)obj))
 126                         return -1;
 127                 return 0;
 128         }
 129         return error("Unable to determine requirements "
 130                      "of type %s for %s",
 131                      obj->type, sha1_to_hex(obj->sha1));
 132 }
 133
 134 static int process(unsigned char *sha1, const char *type)
 135 {
 136         struct object *obj = lookup_object_type(sha1, type);
 137
 138         if (has_sha1_file(sha1)) {
 139                 parse_object(sha1);
 140                 /* We already have it, so we should scan it now. */
 141                 return process_object(obj);
 142         }
 143         if (object_list_contains(process_queue, obj))
 144                 return 0;
 145         object_list_insert(obj, process_queue_end);
 146         process_queue_end = &(*process_queue_end)->next;
 147
 148         //fprintf(stderr, "prefetch %s\n", sha1_to_hex(sha1));
 149         prefetch(sha1);
 150
 151         return 0;
 152 }
 153
 154 static int loop(void)
 155 {
 156         while (process_queue) {
 157                 struct object *obj = process_queue->item;
 158                 /*
 159                 fprintf(stderr, "%d objects to pull\n",
 160                         object_list_length(process_queue));
 161                 */
 162                 process_queue = process_queue->next;
 163                 if (!process_queue)
 164                         process_queue_end = &process_queue;
 165
 166                 //fprintf(stderr, "fetch %s\n", sha1_to_hex(obj->sha1));
 167
 168                 if (make_sure_we_have_it(obj->type ? obj->type : "object",
 169                                          obj->sha1))
 170                         return -1;
 171                 if (!obj->type)
 172                         parse_object(obj->sha1);
 173                 if (process_object(obj))
 174                         return -1;
 175         }
 176         return 0;
 177 }
 178
 179 static int interpret_target(char *target, unsigned char *sha1)
 180 {
 181         if (!get_sha1_hex(target, sha1))
 182                 return 0;
 183         if (!check_ref_format(target)) {
 184                 if (!fetch_ref(target, sha1)) {
 185                         return 0;
 186                 }
 187         }
 188         return -1;
 189 }
 190
 191 static int mark_complete(const char *path, const unsigned char *sha1)
 192 {
 193         struct object *obj = parse_object(sha1);
 194         while (obj->type == tag_type) {
 195                 obj = ((struct tag *) obj)->tagged;
 196                 parse_object(obj->sha1);
 197         }
 198         if (obj->type == commit_type) {
 199                 obj->flags |= 1;
 200                 insert_by_date((struct commit *) obj, &complete);
 201         }
 202         return 0;
 203 }
 204
 205 int pull(char *target)
 206 {
 207         unsigned char sha1[20];
 208         int fd = -1;
 209
 210         if (write_ref && current_ref) {
 211                 fd = lock_ref_sha1(write_ref, current_ref);
 212                 if (fd < 0)
 213                         return -1;
 214         }
 215
 216         for_each_ref(mark_complete);
 217
 218         if (interpret_target(target, sha1))
 219                 return error("Could not interpret %s as something to pull",
 220                              target);
 221         if (process(sha1, NULL))
 222                 return -1;
 223         if (loop())
 224                 return -1;
 225
 226         if (write_ref) {
 227                 if (current_ref) {
 228                         write_ref_sha1(write_ref, fd, sha1);
 229                 } else {
 230                         write_ref_sha1_unlocked(write_ref, sha1);
 231                 }
 232         }
 233         return 0;
 234 }