merge.c

   1 #include "git-compat-util.h"
   2 #include "gettext.h"
   3 #include "hash.h"
   4 #include "hex.h"
   5 #include "lockfile.h"
   6 #include "merge.h"
   7 #include "commit.h"
   8 #include "repository.h"
   9 #include "run-command.h"
  10 #include "resolve-undo.h"
  11 #include "tree.h"
  12 #include "tree-walk.h"
  13 #include "unpack-trees.h"
  14
  15 static const char *merge_argument(struct commit *commit)
  16 {
  17         return oid_to_hex(commit ? &commit->object.oid : the_hash_algo->empty_tree);
  18 }
  19
  20 int try_merge_command(struct repository *r,
  21                       const char *strategy, size_t xopts_nr,
  22                       const char **xopts, struct commit_list *common,
  23                       const char *head_arg, struct commit_list *remotes)
  24 {
  25         struct child_process cmd = CHILD_PROCESS_INIT;
  26         int i, ret;
  27         struct commit_list *j;
  28
  29         strvec_pushf(&cmd.args, "merge-%s", strategy);
  30         for (i = 0; i < xopts_nr; i++)
  31                 strvec_pushf(&cmd.args, "--%s", xopts[i]);
  32         for (j = common; j; j = j->next)
  33                 strvec_push(&cmd.args, merge_argument(j->item));
  34         strvec_push(&cmd.args, "--");
  35         strvec_push(&cmd.args, head_arg);
  36         for (j = remotes; j; j = j->next)
  37                 strvec_push(&cmd.args, merge_argument(j->item));
  38
  39         cmd.git_cmd = 1;
  40         ret = run_command(&cmd);
  41
  42         discard_index(r->index);
  43         if (repo_read_index(r) < 0)
  44                 die(_("failed to read the cache"));
  45         resolve_undo_clear_index(r->index);
  46
  47         return ret;
  48 }
  49
  50 int checkout_fast_forward(struct repository *r,
  51                           const struct object_id *head,
  52                           const struct object_id *remote,
  53                           int overwrite_ignore)
  54 {
  55         struct tree *trees[MAX_UNPACK_TREES];
  56         struct unpack_trees_options opts;
  57         struct tree_desc t[MAX_UNPACK_TREES];
  58         int i, nr_trees = 0;
  59         struct lock_file lock_file = LOCK_INIT;
  60
  61         refresh_index(r->index, REFRESH_QUIET, NULL, NULL, NULL);
  62
  63         if (repo_hold_locked_index(r, &lock_file, LOCK_REPORT_ON_ERROR) < 0)
  64                 return -1;
  65
  66         memset(&trees, 0, sizeof(trees));
  67         memset(&t, 0, sizeof(t));
  68
  69         trees[nr_trees] = parse_tree_indirect(head);
  70         if (!trees[nr_trees++]) {
  71                 rollback_lock_file(&lock_file);
  72                 return -1;
  73         }
  74         trees[nr_trees] = parse_tree_indirect(remote);
  75         if (!trees[nr_trees++]) {
  76                 rollback_lock_file(&lock_file);
  77                 return -1;
  78         }
  79         for (i = 0; i < nr_trees; i++) {
  80                 parse_tree(trees[i]);
  81                 init_tree_desc(t+i, trees[i]->buffer, trees[i]->size);
  82         }
  83
  84         memset(&opts, 0, sizeof(opts));
  85         opts.preserve_ignored = !overwrite_ignore;
  86
  87         opts.head_idx = 1;
  88         opts.src_index = r->index;
  89         opts.dst_index = r->index;
  90         opts.update = 1;
  91         opts.verbose_update = 1;
  92         opts.merge = 1;
  93         opts.fn = twoway_merge;
  94         init_checkout_metadata(&opts.meta, NULL, remote, NULL);
  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(r->index, &lock_file, COMMIT_LOCK))
 105                 return error(_("unable to write new index file"));
 106         return 0;
 107 }