merge.c

   1 #include "cache.h"
   2 #include "lockfile.h"
   3 #include "commit.h"
   4 #include "run-command.h"
   5 #include "resolve-undo.h"
   6 #include "tree-walk.h"
   7 #include "unpack-trees.h"
   8 #include "dir.h"
   9
  10 static const char *merge_argument(struct commit *commit)
  11 {
  12         if (commit)
  13                 return oid_to_hex(&commit->object.oid);
  14         else
  15                 return EMPTY_TREE_SHA1_HEX;
  16 }
  17
  18 int try_merge_command(const char *strategy, size_t xopts_nr,
  19                       const char **xopts, struct commit_list *common,
  20                       const char *head_arg, struct commit_list *remotes)
  21 {
  22         struct argv_array args = ARGV_ARRAY_INIT;
  23         int i, ret;
  24         struct commit_list *j;
  25
  26         argv_array_pushf(&args, "merge-%s", strategy);
  27         for (i = 0; i < xopts_nr; i++)
  28                 argv_array_pushf(&args, "--%s", xopts[i]);
  29         for (j = common; j; j = j->next)
  30                 argv_array_push(&args, merge_argument(j->item));
  31         argv_array_push(&args, "--");
  32         argv_array_push(&args, head_arg);
  33         for (j = remotes; j; j = j->next)
  34                 argv_array_push(&args, merge_argument(j->item));
  35
  36         ret = run_command_v_opt(args.argv, RUN_GIT_CMD);
  37         argv_array_clear(&args);
  38
  39         discard_cache();
  40         if (read_cache() < 0)
  41                 die(_("failed to read the cache"));
  42         resolve_undo_clear();
  43
  44         return ret;
  45 }
  46
  47 int checkout_fast_forward(const unsigned char *head,
  48                           const unsigned char *remote,
  49                           int overwrite_ignore)
  50 {
  51         struct tree *trees[MAX_UNPACK_TREES];
  52         struct unpack_trees_options opts;
  53         struct tree_desc t[MAX_UNPACK_TREES];
  54         int i, nr_trees = 0;
  55         struct dir_struct dir;
  56         struct lock_file *lock_file = xcalloc(1, sizeof(struct lock_file));
  57
  58         refresh_cache(REFRESH_QUIET);
  59
  60         if (hold_locked_index(lock_file, LOCK_REPORT_ON_ERROR) < 0)
  61                 return -1;
  62
  63         memset(&trees, 0, sizeof(trees));
  64         memset(&opts, 0, sizeof(opts));
  65         memset(&t, 0, sizeof(t));
  66         if (overwrite_ignore) {
  67                 memset(&dir, 0, sizeof(dir));
  68                 dir.flags |= DIR_SHOW_IGNORED;
  69                 setup_standard_excludes(&dir);
  70                 opts.dir = &dir;
  71         }
  72
  73         opts.head_idx = 1;
  74         opts.src_index = &the_index;
  75         opts.dst_index = &the_index;
  76         opts.update = 1;
  77         opts.verbose_update = 1;
  78         opts.merge = 1;
  79         opts.fn = twoway_merge;
  80         setup_unpack_trees_porcelain(&opts, "merge");
  81
  82         trees[nr_trees] = parse_tree_indirect(head);
  83         if (!trees[nr_trees++])
  84                 return -1;
  85         trees[nr_trees] = parse_tree_indirect(remote);
  86         if (!trees[nr_trees++])
  87                 return -1;
  88         for (i = 0; i < nr_trees; i++) {
  89                 parse_tree(trees[i]);
  90                 init_tree_desc(t+i, trees[i]->buffer, trees[i]->size);
  91         }
  92         if (unpack_trees(nr_trees, t, &opts))
  93                 return -1;
  94         if (write_locked_index(&the_index, lock_file, COMMIT_LOCK)) {
  95                 rollback_lock_file(lock_file);
  96                 return error(_("unable to write new index file"));
  97         }
  98         return 0;
  99 }