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 /* 1 means "get delta", 2 means "really check delta harder */
  17 int get_delta = 1;
  18 int get_all = 0;
  19 int get_verbosely = 0;
  20 static unsigned char current_commit_sha1[20];
  21
  22 static const char commitS[] = "commit";
  23 static const char treeS[] = "tree";
  24 static const char blobS[] = "blob";
  25
  26 void pull_say(const char *fmt, const char *hex) {
  27         if (get_verbosely)
  28                 fprintf(stderr, fmt, hex);
  29 }
  30
  31 static void report_missing(const char *what, const unsigned char *missing)
  32 {
  33         char missing_hex[41];
  34
  35         strcpy(missing_hex, sha1_to_hex(missing));;
  36         fprintf(stderr,
  37                 "Cannot obtain needed %s %s\nwhile processing commit %s.\n",
  38                 what, missing_hex, sha1_to_hex(current_commit_sha1));
  39 }
  40
  41 static int make_sure_we_have_it(const char *what, unsigned char *sha1)
  42 {
  43         int status = 0;
  44
  45         if (!has_sha1_file(sha1)) {
  46                 status = fetch(sha1);
  47                 if (status && what)
  48                         report_missing(what, sha1);
  49         }
  50         else if (get_delta < 2)
  51                 return 0;
  52
  53         if (get_delta) {
  54                 unsigned char delta_sha1[20];
  55                 status = sha1_delta_base(sha1, delta_sha1);
  56                 if (0 < status)
  57                         status = make_sure_we_have_it(what, delta_sha1);
  58         }
  59         return status;
  60 }
  61
  62 static int process_unknown(unsigned char *sha1);
  63
  64 static int process_tree(unsigned char *sha1)
  65 {
  66         struct tree *tree = lookup_tree(sha1);
  67         struct tree_entry_list *entries;
  68
  69         if (parse_tree(tree))
  70                 return -1;
  71
  72         for (entries = tree->entries; entries; entries = entries->next) {
  73                 const char *what = entries->directory ? treeS : blobS;
  74                 if (make_sure_we_have_it(what, entries->item.tree->object.sha1))
  75                         return -1;
  76                 if (entries->directory) {
  77                         if (process_tree(entries->item.tree->object.sha1))
  78                                 return -1;
  79                 }
  80         }
  81         return 0;
  82 }
  83
  84 static int process_commit(unsigned char *sha1)
  85 {
  86         struct commit *obj = lookup_commit(sha1);
  87
  88         if (make_sure_we_have_it(commitS, sha1))
  89                 return -1;
  90
  91         if (parse_commit(obj))
  92                 return -1;
  93
  94         if (get_tree) {
  95                 if (make_sure_we_have_it(treeS, obj->tree->object.sha1))
  96                         return -1;
  97                 if (process_tree(obj->tree->object.sha1))
  98                         return -1;
  99                 if (!get_all)
 100                         get_tree = 0;
 101         }
 102         if (get_history) {
 103                 struct commit_list *parents = obj->parents;
 104                 for (; parents; parents = parents->next) {
 105                         if (has_sha1_file(parents->item->object.sha1))
 106                                 continue;
 107                         if (make_sure_we_have_it(NULL,
 108                                                  parents->item->object.sha1)) {
 109                                 /* The server might not have it, and
 110                                  * we don't mind.
 111                                  */
 112                                 continue;
 113                         }
 114                         if (process_commit(parents->item->object.sha1))
 115                                 return -1;
 116                         memcpy(current_commit_sha1, sha1, 20);
 117                 }
 118         }
 119         return 0;
 120 }
 121
 122 static int process_tag(unsigned char *sha1)
 123 {
 124         struct tag *obj = lookup_tag(sha1);
 125
 126         if (parse_tag(obj))
 127                 return -1;
 128         return process_unknown(obj->tagged->sha1);
 129 }
 130
 131 static int process_unknown(unsigned char *sha1)
 132 {
 133         struct object *obj;
 134         if (make_sure_we_have_it("object", sha1))
 135                 return -1;
 136         obj = parse_object(sha1);
 137         if (!obj)
 138                 return error("Unable to parse object %s", sha1_to_hex(sha1));
 139         if (obj->type == commit_type)
 140                 return process_commit(sha1);
 141         if (obj->type == tree_type)
 142                 return process_tree(sha1);
 143         if (obj->type == blob_type)
 144                 return 0;
 145         if (obj->type == tag_type)
 146                 return process_tag(sha1);
 147         return error("Unable to determine requirement of type %s for %s",
 148                      obj->type, sha1_to_hex(sha1));
 149 }
 150
 151 static int interpret_target(char *target, unsigned char *sha1)
 152 {
 153         if (!get_sha1_hex(target, sha1))
 154                 return 0;
 155         if (!check_ref_format(target)) {
 156                 if (!fetch_ref(target, sha1)) {
 157                         return 0;
 158                 }
 159         }
 160         return -1;
 161 }
 162
 163
 164 int pull(char *target)
 165 {
 166         unsigned char sha1[20];
 167         int fd = -1;
 168
 169         if (write_ref && current_ref) {
 170                 fd = lock_ref_sha1(write_ref, current_ref);
 171                 if (fd < 0)
 172                         return -1;
 173         }
 174
 175         if (interpret_target(target, sha1))
 176                 return error("Could not interpret %s as something to pull",
 177                              target);
 178         if (process_unknown(sha1))
 179                 return -1;
 180
 181         if (write_ref) {
 182                 if (current_ref) {
 183                         write_ref_sha1(write_ref, fd, sha1);
 184                 } else {
 185                         write_ref_sha1_unlocked(write_ref, sha1);
 186                 }
 187         }
 188         return 0;
 189 }