pull.c

   1 #include "pull.h"
   2
   3 #include "cache.h"
   4 #include "commit.h"
   5 #include "tree.h"
   6 #include "refs.h"
   7
   8 const char *write_ref = NULL;
   9
  10 const unsigned char *current_ref = NULL;
  11
  12 int get_tree = 0;
  13 int get_history = 0;
  14 /* 1 means "get delta", 2 means "really check delta harder */
  15 int get_delta = 1;
  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         else if (get_delta < 2)
  49                 return 0;
  50
  51         if (get_delta) {
  52                 unsigned char delta_sha1[20];
  53                 status = sha1_delta_base(sha1, delta_sha1);
  54                 if (0 < status)
  55                         status = make_sure_we_have_it(what, delta_sha1);
  56         }
  57         return status;
  58 }
  59
  60 static int process_tree(unsigned char *sha1)
  61 {
  62         struct tree *tree = lookup_tree(sha1);
  63         struct tree_entry_list *entries;
  64
  65         if (parse_tree(tree))
  66                 return -1;
  67
  68         for (entries = tree->entries; entries; entries = entries->next) {
  69                 const char *what = entries->directory ? treeS : blobS;
  70                 if (make_sure_we_have_it(what, entries->item.tree->object.sha1))
  71                         return -1;
  72                 if (entries->directory) {
  73                         if (process_tree(entries->item.tree->object.sha1))
  74                                 return -1;
  75                 }
  76         }
  77         return 0;
  78 }
  79
  80 static int process_commit(unsigned char *sha1)
  81 {
  82         struct commit *obj = lookup_commit(sha1);
  83
  84         if (make_sure_we_have_it(commitS, sha1))
  85                 return -1;
  86
  87         if (parse_commit(obj))
  88                 return -1;
  89
  90         if (get_tree) {
  91                 if (make_sure_we_have_it(treeS, obj->tree->object.sha1))
  92                         return -1;
  93                 if (process_tree(obj->tree->object.sha1))
  94                         return -1;
  95                 if (!get_all)
  96                         get_tree = 0;
  97         }
  98         if (get_history) {
  99                 struct commit_list *parents = obj->parents;
 100                 for (; parents; parents = parents->next) {
 101                         if (has_sha1_file(parents->item->object.sha1))
 102                                 continue;
 103                         if (make_sure_we_have_it(NULL,
 104                                                  parents->item->object.sha1)) {
 105                                 /* The server might not have it, and
 106                                  * we don't mind.
 107                                  */
 108                                 continue;
 109                         }
 110                         if (process_commit(parents->item->object.sha1))
 111                                 return -1;
 112                         memcpy(current_commit_sha1, sha1, 20);
 113                 }
 114         }
 115         return 0;
 116 }
 117
 118 static int interpret_target(char *target, unsigned char *sha1)
 119 {
 120         if (!get_sha1_hex(target, sha1))
 121                 return 0;
 122         if (!check_ref_format(target)) {
 123                 if (!fetch_ref(target, sha1)) {
 124                         return 0;
 125                 }
 126         }
 127         return -1;
 128 }
 129
 130
 131 int pull(char *target)
 132 {
 133         unsigned char sha1[20];
 134         int fd = -1;
 135
 136         if (write_ref && current_ref) {
 137                 fd = lock_ref_sha1(write_ref, current_ref);
 138                 if (fd < 0)
 139                         return -1;
 140         }
 141
 142         if (interpret_target(target, sha1))
 143                 return error("Could not interpret %s as something to pull",
 144                              target);
 145         if (process_commit(sha1))
 146                 return -1;
 147
 148         if (write_ref) {
 149                 if (current_ref) {
 150                         write_ref_sha1(write_ref, fd, sha1);
 151                 } else {
 152                         write_ref_sha1_unlocked(write_ref, sha1);
 153                 }
 154         }
 155         return 0;
 156 }