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 #define COMPLETE        1U
  66 static struct commit_list *complete = NULL;
  67
  68 static int process_commit(struct commit *commit)
  69 {
  70         if (parse_commit(commit))
  71                 return -1;
  72
  73         while (complete && complete->item->date >= commit->date) {
  74                 pop_most_recent_commit(&complete, COMPLETE);
  75         }
  76
  77
  78         if (commit->object.flags & COMPLETE)
  79                 return 0;
  80
  81         memcpy(current_commit_sha1, commit->object.sha1, 20);
  82
  83         if (get_tree) {
  84                 if (process(commit->tree->object.sha1, tree_type))
  85                         return -1;
  86                 if (!get_all)
  87                         get_tree = 0;
  88         }
  89         if (get_history) {
  90                 struct commit_list *parents = commit->parents;
  91                 for (; parents; parents = parents->next) {
  92                         if (process(parents->item->object.sha1,
  93                                     commit_type))
  94                                 return -1;
  95                 }
  96         }
  97         return 0;
  98 }
  99
 100 static int process_tag(struct tag *tag)
 101 {
 102         if (parse_tag(tag))
 103                 return -1;
 104         return process(tag->tagged->sha1, NULL);
 105 }
 106
 107 static struct object_list *process_queue = NULL;
 108 static struct object_list **process_queue_end = &process_queue;
 109
 110 static int process_object(struct object *obj)
 111 {
 112         if (obj->type == commit_type) {
 113                 if (process_commit((struct commit *)obj))
 114                         return -1;
 115                 return 0;
 116         }
 117         if (obj->type == tree_type) {
 118                 if (process_tree((struct tree *)obj))
 119                         return -1;
 120                 return 0;
 121         }
 122         if (obj->type == blob_type) {
 123                 return 0;
 124         }
 125         if (obj->type == tag_type) {
 126                 if (process_tag((struct tag *)obj))
 127                         return -1;
 128                 return 0;
 129         }
 130         return error("Unable to determine requirements "
 131                      "of type %s for %s",
 132                      obj->type, sha1_to_hex(obj->sha1));
 133 }
 134
 135 static int process(unsigned char *sha1, const char *type)
 136 {
 137         struct object *obj = lookup_object_type(sha1, type);
 138
 139         if (has_sha1_file(sha1)) {
 140                 parse_object(sha1);
 141                 /* We already have it, so we should scan it now. */
 142                 return process_object(obj);
 143         }
 144         if (object_list_contains(process_queue, obj))
 145                 return 0;
 146         object_list_insert(obj, process_queue_end);
 147         process_queue_end = &(*process_queue_end)->next;
 148
 149         //fprintf(stderr, "prefetch %s\n", sha1_to_hex(sha1));
 150         prefetch(sha1);
 151
 152         return 0;
 153 }
 154
 155 static int loop(void)
 156 {
 157         while (process_queue) {
 158                 struct object *obj = process_queue->item;
 159                 /*
 160                 fprintf(stderr, "%d objects to pull\n",
 161                         object_list_length(process_queue));
 162                 */
 163                 process_queue = process_queue->next;
 164                 if (!process_queue)
 165                         process_queue_end = &process_queue;
 166
 167                 //fprintf(stderr, "fetch %s\n", sha1_to_hex(obj->sha1));
 168
 169                 if (make_sure_we_have_it(obj->type ? obj->type : "object",
 170                                          obj->sha1))
 171                         return -1;
 172                 if (!obj->type)
 173                         parse_object(obj->sha1);
 174                 if (process_object(obj))
 175                         return -1;
 176         }
 177         return 0;
 178 }
 179
 180 static int interpret_target(char *target, unsigned char *sha1)
 181 {
 182         if (!get_sha1_hex(target, sha1))
 183                 return 0;
 184         if (!check_ref_format(target)) {
 185                 if (!fetch_ref(target, sha1)) {
 186                         return 0;
 187                 }
 188         }
 189         return -1;
 190 }
 191
 192 static int mark_complete(const char *path, const unsigned char *sha1)
 193 {
 194         struct commit *commit = lookup_commit_reference_gently(sha1, 1);
 195         if (commit) {
 196                 commit->object.flags |= COMPLETE;
 197                 insert_by_date(commit, &complete);
 198         }
 199         return 0;
 200 }
 201
 202 int pull(char *target)
 203 {
 204         unsigned char sha1[20];
 205         int fd = -1;
 206
 207         save_commit_buffer = 0;
 208         if (write_ref && current_ref) {
 209                 fd = lock_ref_sha1(write_ref, current_ref);
 210                 if (fd < 0)
 211                         return -1;
 212         }
 213
 214         for_each_ref(mark_complete);
 215
 216         if (interpret_target(target, sha1))
 217                 return error("Could not interpret %s as something to pull",
 218                              target);
 219         if (process(sha1, NULL))
 220                 return -1;
 221         if (loop())
 222                 return -1;
 223
 224         if (write_ref) {
 225                 if (current_ref) {
 226                         write_ref_sha1(write_ref, fd, sha1);
 227                 } else {
 228                         write_ref_sha1_unlocked(write_ref, sha1);
 229                 }
 230         }
 231         return 0;
 232 }