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