pull.c

   1 #include "pull.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 static const char commitS[] = "commit";
  21 static const char treeS[] = "tree";
  22 static const char blobS[] = "blob";
  23
  24 void pull_say(const char *fmt, const char *hex) {
  25         if (get_verbosely)
  26                 fprintf(stderr, fmt, hex);
  27 }
  28
  29 static void report_missing(const char *what, const unsigned char *missing)
  30 {
  31         char missing_hex[41];
  32
  33         strcpy(missing_hex, sha1_to_hex(missing));;
  34         fprintf(stderr,
  35                 "Cannot obtain needed %s %s\nwhile processing commit %s.\n",
  36                 what, missing_hex, sha1_to_hex(current_commit_sha1));
  37 }
  38
  39 static int make_sure_we_have_it(const char *what, unsigned char *sha1)
  40 {
  41         int status = 0;
  42
  43         if (!has_sha1_file(sha1)) {
  44                 status = fetch(sha1);
  45                 if (status && what)
  46                         report_missing(what, sha1);
  47         }
  48         return status;
  49 }
  50
  51 static int process_unknown(unsigned char *sha1);
  52
  53 static int process_tree(unsigned char *sha1)
  54 {
  55         struct tree *tree = lookup_tree(sha1);
  56         struct tree_entry_list *entries;
  57
  58         if (parse_tree(tree))
  59                 return -1;
  60
  61         for (entries = tree->entries; entries; entries = entries->next) {
  62                 const char *what = entries->directory ? treeS : blobS;
  63                 if (make_sure_we_have_it(what, entries->item.tree->object.sha1))
  64                         return -1;
  65                 if (entries->directory) {
  66                         if (process_tree(entries->item.tree->object.sha1))
  67                                 return -1;
  68                 }
  69         }
  70         return 0;
  71 }
  72
  73 static int process_commit(unsigned char *sha1)
  74 {
  75         struct commit *obj = lookup_commit(sha1);
  76
  77         if (make_sure_we_have_it(commitS, sha1))
  78                 return -1;
  79
  80         if (parse_commit(obj))
  81                 return -1;
  82
  83         if (get_tree) {
  84                 if (make_sure_we_have_it(treeS, obj->tree->object.sha1))
  85                         return -1;
  86                 if (process_tree(obj->tree->object.sha1))
  87                         return -1;
  88                 if (!get_all)
  89                         get_tree = 0;
  90         }
  91         if (get_history) {
  92                 struct commit_list *parents = obj->parents;
  93                 for (; parents; parents = parents->next) {
  94                         if (has_sha1_file(parents->item->object.sha1))
  95                                 continue;
  96                         if (make_sure_we_have_it(NULL,
  97                                                  parents->item->object.sha1)) {
  98                                 /* The server might not have it, and
  99                                  * we don't mind.
 100                                  */
 101                                 continue;
 102                         }
 103                         if (process_commit(parents->item->object.sha1))
 104                                 return -1;
 105                         memcpy(current_commit_sha1, sha1, 20);
 106                 }
 107         }
 108         return 0;
 109 }
 110
 111 static int process_tag(unsigned char *sha1)
 112 {
 113         struct tag *obj = lookup_tag(sha1);
 114
 115         if (parse_tag(obj))
 116                 return -1;
 117         return process_unknown(obj->tagged->sha1);
 118 }
 119
 120 static int process_unknown(unsigned char *sha1)
 121 {
 122         struct object *obj;
 123         if (make_sure_we_have_it("object", sha1))
 124                 return -1;
 125         obj = parse_object(sha1);
 126         if (!obj)
 127                 return error("Unable to parse object %s", sha1_to_hex(sha1));
 128         if (obj->type == commit_type)
 129                 return process_commit(sha1);
 130         if (obj->type == tree_type)
 131                 return process_tree(sha1);
 132         if (obj->type == blob_type)
 133                 return 0;
 134         if (obj->type == tag_type)
 135                 return process_tag(sha1);
 136         return error("Unable to determine requirement of type %s for %s",
 137                      obj->type, sha1_to_hex(sha1));
 138 }
 139
 140 static int interpret_target(char *target, unsigned char *sha1)
 141 {
 142         if (!get_sha1_hex(target, sha1))
 143                 return 0;
 144         if (!check_ref_format(target)) {
 145                 if (!fetch_ref(target, sha1)) {
 146                         return 0;
 147                 }
 148         }
 149         return -1;
 150 }
 151
 152
 153 int pull(char *target)
 154 {
 155         unsigned char sha1[20];
 156         int fd = -1;
 157
 158         if (write_ref && current_ref) {
 159                 fd = lock_ref_sha1(write_ref, current_ref);
 160                 if (fd < 0)
 161                         return -1;
 162         }
 163
 164         if (interpret_target(target, sha1))
 165                 return error("Could not interpret %s as something to pull",
 166                              target);
 167         if (process_unknown(sha1))
 168                 return -1;
 169
 170         if (write_ref) {
 171                 if (current_ref) {
 172                         write_ref_sha1(write_ref, fd, sha1);
 173                 } else {
 174                         write_ref_sha1_unlocked(write_ref, sha1);
 175                 }
 176         }
 177         return 0;
 178 }