pull.c

   1 #include "pull.h"
   2
   3 #include "cache.h"
   4 #include "commit.h"
   5 #include "tree.h"
   6
   7 int get_tree = 0;
   8 int get_history = 0;
   9 int get_delta = 1;
  10 int get_all = 0;
  11 int get_verbosely = 0;
  12 static unsigned char current_commit_sha1[20];
  13
  14 static const char commitS[] = "commit";
  15 static const char treeS[] = "tree";
  16 static const char blobS[] = "blob";
  17
  18 void pull_say(const char *fmt, const char *hex) {
  19         if (get_verbosely)
  20                 fprintf(stderr, fmt, hex);
  21 }
  22
  23 static void report_missing(const char *what, const unsigned char *missing)
  24 {
  25         char missing_hex[41];
  26
  27         strcpy(missing_hex, sha1_to_hex(missing));;
  28         fprintf(stderr,
  29                 "Cannot obtain needed %s %s\nwhile processing commit %s.\n",
  30                 what, missing_hex, sha1_to_hex(current_commit_sha1));
  31 }
  32
  33 static int make_sure_we_have_it(const char *what, unsigned char *sha1)
  34 {
  35         int status;
  36         if (has_sha1_file(sha1))
  37                 return 0;
  38         status = fetch(sha1);
  39         if (status && what)
  40                 report_missing(what, sha1);
  41         if (get_delta) {
  42                 char delta_sha1[20];
  43                 status = sha1_delta_base(sha1, delta_sha1);
  44                 if (0 < status)
  45                         status = make_sure_we_have_it(what, delta_sha1);
  46         }
  47         return status;
  48 }
  49
  50 static int process_tree(unsigned char *sha1)
  51 {
  52         struct tree *tree = lookup_tree(sha1);
  53         struct tree_entry_list *entries;
  54
  55         if (parse_tree(tree))
  56                 return -1;
  57
  58         for (entries = tree->entries; entries; entries = entries->next) {
  59                 const char *what = entries->directory ? treeS : blobS;
  60                 if (make_sure_we_have_it(what, entries->item.tree->object.sha1))
  61                         return -1;
  62                 if (entries->directory) {
  63                         if (process_tree(entries->item.tree->object.sha1))
  64                                 return -1;
  65                 }
  66         }
  67         return 0;
  68 }
  69
  70 static int process_commit(unsigned char *sha1)
  71 {
  72         struct commit *obj = lookup_commit(sha1);
  73
  74         if (make_sure_we_have_it(commitS, sha1))
  75                 return -1;
  76
  77         if (parse_commit(obj))
  78                 return -1;
  79
  80         if (get_tree) {
  81                 if (make_sure_we_have_it(treeS, obj->tree->object.sha1))
  82                         return -1;
  83                 if (process_tree(obj->tree->object.sha1))
  84                         return -1;
  85                 if (!get_all)
  86                         get_tree = 0;
  87         }
  88         if (get_history) {
  89                 struct commit_list *parents = obj->parents;
  90                 for (; parents; parents = parents->next) {
  91                         if (has_sha1_file(parents->item->object.sha1))
  92                                 continue;
  93                         if (make_sure_we_have_it(NULL,
  94                                                  parents->item->object.sha1)) {
  95                                 /* The server might not have it, and
  96                                  * we don't mind.
  97                                  */
  98                                 continue;
  99                         }
 100                         if (process_commit(parents->item->object.sha1))
 101                                 return -1;
 102                         memcpy(current_commit_sha1, sha1, 20);
 103                 }
 104         }
 105         return 0;
 106 }
 107
 108 int pull(char *target)
 109 {
 110         int retval;
 111         unsigned char sha1[20];
 112         retval = get_sha1_hex(target, sha1);
 113         if (retval)
 114                 return retval;
 115         retval = make_sure_we_have_it(commitS, sha1);
 116         if (retval)
 117                 return retval;
 118         memcpy(current_commit_sha1, sha1, 20);
 119         return process_commit(sha1);
 120 }