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 sha1_to_hex(commit->object.sha1);
  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         hold_locked_index(lock_file, 1);
  61
  62         memset(&trees, 0, sizeof(trees));
  63         memset(&opts, 0, sizeof(opts));
  64         memset(&t, 0, sizeof(t));
  65         if (overwrite_ignore) {
  66                 memset(&dir, 0, sizeof(dir));
  67                 dir.flags |= DIR_SHOW_IGNORED;
  68                 setup_standard_excludes(&dir);
  69                 opts.dir = &dir;
  70         }
  71
  72         opts.head_idx = 1;
  73         opts.src_index = &the_index;
  74         opts.dst_index = &the_index;
  75         opts.update = 1;
  76         opts.verbose_update = 1;
  77         opts.merge = 1;
  78         opts.fn = twoway_merge;
  79         setup_unpack_trees_porcelain(&opts, "merge");
  80
  81         trees[nr_trees] = parse_tree_indirect(head);
  82         if (!trees[nr_trees++])
  83                 return -1;
  84         trees[nr_trees] = parse_tree_indirect(remote);
  85         if (!trees[nr_trees++])
  86                 return -1;
  87         for (i = 0; i < nr_trees; i++) {
  88                 parse_tree(trees[i]);
  89                 init_tree_desc(t+i, trees[i]->buffer, trees[i]->size);
  90         }
  91         if (unpack_trees(nr_trees, t, &opts))
  92                 return -1;
  93         if (write_locked_index(&the_index, lock_file, COMMIT_LOCK))
  94                 die(_("unable to write new index file"));
  95         return 0;
  96 }