Andrew's git - gitweb.git/blob

   1#include "pull.h"
   2
   3#include "cache.h"
   4#include "commit.h"
   5#include "tree.h"
   6
   7int get_tree = 0;
   8int get_history = 0;
   9int get_all = 0;
  10static unsigned char current_commit_sha1[20];
  11
  12static const char commitS[] = "commit";
  13static const char treeS[] = "tree";
  14static const char blobS[] = "blob";
  15
  16static 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
  26static 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
  37static 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
  57static 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
  95int 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}