merge.c

   1 #include "cache.h"
   2 #include "diff.h"
   3 #include "diffcore.h"
   4 #include "lockfile.h"
   5 #include "commit.h"
   6 #include "run-command.h"
   7 #include "resolve-undo.h"
   8 #include "tree-walk.h"
   9 #include "unpack-trees.h"
  10 #include "dir.h"
  11
  12 static const char *merge_argument(struct commit *commit)
  13 {
  14         return oid_to_hex(commit ? &commit->object.oid : the_hash_algo->empty_tree);
  15 }
  16
  17 int try_merge_command(const char *strategy, size_t xopts_nr,
  18                       const char **xopts, struct commit_list *common,
  19                       const char *head_arg, struct commit_list *remotes)
  20 {
  21         struct argv_array args = ARGV_ARRAY_INIT;
  22         int i, ret;
  23         struct commit_list *j;
  24
  25         argv_array_pushf(&args, "merge-%s", strategy);
  26         for (i = 0; i < xopts_nr; i++)
  27                 argv_array_pushf(&args, "--%s", xopts[i]);
  28         for (j = common; j; j = j->next)
  29                 argv_array_push(&args, merge_argument(j->item));
  30         argv_array_push(&args, "--");
  31         argv_array_push(&args, head_arg);
  32         for (j = remotes; j; j = j->next)
  33                 argv_array_push(&args, merge_argument(j->item));
  34
  35         ret = run_command_v_opt(args.argv, RUN_GIT_CMD);
  36         argv_array_clear(&args);
  37
  38         discard_cache();
  39         if (read_cache() < 0)
  40                 die(_("failed to read the cache"));
  41         resolve_undo_clear();
  42
  43         return ret;
  44 }
  45
  46 int checkout_fast_forward(const struct object_id *head,
  47                           const struct object_id *remote,
  48                           int overwrite_ignore)
  49 {
  50         struct tree *trees[MAX_UNPACK_TREES];
  51         struct unpack_trees_options opts;
  52         struct tree_desc t[MAX_UNPACK_TREES];
  53         int i, nr_trees = 0;
  54         struct dir_struct dir;
  55         struct lock_file lock_file = LOCK_INIT;
  56
  57         refresh_cache(REFRESH_QUIET);
  58
  59         if (hold_locked_index(&lock_file, LOCK_REPORT_ON_ERROR) < 0)
  60                 return -1;
  61
  62         memset(&trees, 0, sizeof(trees));
  63         memset(&t, 0, sizeof(t));
  64
  65         trees[nr_trees] = parse_tree_indirect(head);
  66         if (!trees[nr_trees++]) {
  67                 rollback_lock_file(&lock_file);
  68                 return -1;
  69         }
  70         trees[nr_trees] = parse_tree_indirect(remote);
  71         if (!trees[nr_trees++]) {
  72                 rollback_lock_file(&lock_file);
  73                 return -1;
  74         }
  75         for (i = 0; i < nr_trees; i++) {
  76                 parse_tree(trees[i]);
  77                 init_tree_desc(t+i, trees[i]->buffer, trees[i]->size);
  78         }
  79
  80         memset(&opts, 0, sizeof(opts));
  81         if (overwrite_ignore) {
  82                 memset(&dir, 0, sizeof(dir));
  83                 dir.flags |= DIR_SHOW_IGNORED;
  84                 setup_standard_excludes(&dir);
  85                 opts.dir = &dir;
  86         }
  87
  88         opts.head_idx = 1;
  89         opts.src_index = &the_index;
  90         opts.dst_index = &the_index;
  91         opts.update = 1;
  92         opts.verbose_update = 1;
  93         opts.merge = 1;
  94         opts.fn = twoway_merge;
  95         setup_unpack_trees_porcelain(&opts, "merge");
  96
  97         if (unpack_trees(nr_trees, t, &opts)) {
  98                 rollback_lock_file(&lock_file);
  99                 clear_unpack_trees_porcelain(&opts);
 100                 return -1;
 101         }
 102         clear_unpack_trees_porcelain(&opts);
 103
 104         if (write_locked_index(&the_index, &lock_file, COMMIT_LOCK))
 105                 return error(_("unable to write new index file"));
 106         return 0;
 107 }