merge.c

   1 #include "git-compat-util.h"
   2 #include "diff.h"
   3 #include "diffcore.h"
   4 #include "gettext.h"
   5 #include "hash.h"
   6 #include "hex.h"
   7 #include "lockfile.h"
   8 #include "merge.h"
   9 #include "commit.h"
  10 #include "repository.h"
  11 #include "run-command.h"
  12 #include "resolve-undo.h"
  13 #include "tree.h"
  14 #include "tree-walk.h"
  15 #include "unpack-trees.h"
  16 #include "dir.h"
  17
  18 static const char *merge_argument(struct commit *commit)
  19 {
  20         return oid_to_hex(commit ? &commit->object.oid : the_hash_algo->empty_tree);
  21 }
  22
  23 int try_merge_command(struct repository *r,
  24                       const char *strategy, size_t xopts_nr,
  25                       const char **xopts, struct commit_list *common,
  26                       const char *head_arg, struct commit_list *remotes)
  27 {
  28         struct child_process cmd = CHILD_PROCESS_INIT;
  29         int i, ret;
  30         struct commit_list *j;
  31
  32         strvec_pushf(&cmd.args, "merge-%s", strategy);
  33         for (i = 0; i < xopts_nr; i++)
  34                 strvec_pushf(&cmd.args, "--%s", xopts[i]);
  35         for (j = common; j; j = j->next)
  36                 strvec_push(&cmd.args, merge_argument(j->item));
  37         strvec_push(&cmd.args, "--");
  38         strvec_push(&cmd.args, head_arg);
  39         for (j = remotes; j; j = j->next)
  40                 strvec_push(&cmd.args, merge_argument(j->item));
  41
  42         cmd.git_cmd = 1;
  43         ret = run_command(&cmd);
  44
  45         discard_index(r->index);
  46         if (repo_read_index(r) < 0)
  47                 die(_("failed to read the cache"));
  48         resolve_undo_clear_index(r->index);
  49
  50         return ret;
  51 }
  52
  53 int checkout_fast_forward(struct repository *r,
  54                           const struct object_id *head,
  55                           const struct object_id *remote,
  56                           int overwrite_ignore)
  57 {
  58         struct tree *trees[MAX_UNPACK_TREES];
  59         struct unpack_trees_options opts;
  60         struct tree_desc t[MAX_UNPACK_TREES];
  61         int i, nr_trees = 0;
  62         struct lock_file lock_file = LOCK_INIT;
  63
  64         refresh_index(r->index, REFRESH_QUIET, NULL, NULL, NULL);
  65
  66         if (repo_hold_locked_index(r, &lock_file, LOCK_REPORT_ON_ERROR) < 0)
  67                 return -1;
  68
  69         memset(&trees, 0, sizeof(trees));
  70         memset(&t, 0, sizeof(t));
  71
  72         trees[nr_trees] = parse_tree_indirect(head);
  73         if (!trees[nr_trees++]) {
  74                 rollback_lock_file(&lock_file);
  75                 return -1;
  76         }
  77         trees[nr_trees] = parse_tree_indirect(remote);
  78         if (!trees[nr_trees++]) {
  79                 rollback_lock_file(&lock_file);
  80                 return -1;
  81         }
  82         for (i = 0; i < nr_trees; i++) {
  83                 if (parse_tree(trees[i]) < 0) {
  84                         rollback_lock_file(&lock_file);
  85                         return -1;
  86                 }
  87                 init_tree_desc(t+i, trees[i]->buffer, trees[i]->size);
  88         }
  89
  90         memset(&opts, 0, sizeof(opts));
  91         opts.preserve_ignored = !overwrite_ignore;
  92
  93         opts.head_idx = 1;
  94         opts.src_index = r->index;
  95         opts.dst_index = r->index;
  96         opts.update = 1;
  97         opts.verbose_update = 1;
  98         opts.merge = 1;
  99         opts.fn = twoway_merge;
 100         init_checkout_metadata(&opts.meta, NULL, remote, NULL);
 101         setup_unpack_trees_porcelain(&opts, "merge");
 102
 103         if (unpack_trees(nr_trees, t, &opts)) {
 104                 rollback_lock_file(&lock_file);
 105                 clear_unpack_trees_porcelain(&opts);
 106                 return -1;
 107         }
 108         clear_unpack_trees_porcelain(&opts);
 109
 110         if (write_locked_index(r->index, &lock_file, COMMIT_LOCK))
 111                 return error(_("unable to write new index file"));
 112         return 0;
 113 }