merge.c

   1 #include "cache.h"
   2 #include "commit.h"
   3 #include "run-command.h"
   4 #include "resolve-undo.h"
   5 #include "tree-walk.h"
   6 #include "unpack-trees.h"
   7 #include "dir.h"
   8
   9 static const char *merge_argument(struct commit *commit)
  10 {
  11         if (commit)
  12                 return sha1_to_hex(commit->object.sha1);
  13         else
  14                 return EMPTY_TREE_SHA1_HEX;
  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         const char **args;
  22         int i = 0, x = 0, ret;
  23         struct commit_list *j;
  24         struct strbuf buf = STRBUF_INIT;
  25
  26         args = xmalloc((4 + xopts_nr + commit_list_count(common) +
  27                         commit_list_count(remotes)) * sizeof(char *));
  28         strbuf_addf(&buf, "merge-%s", strategy);
  29         args[i++] = buf.buf;
  30         for (x = 0; x < xopts_nr; x++) {
  31                 char *s = xmalloc(strlen(xopts[x])+2+1);
  32                 strcpy(s, "--");
  33                 strcpy(s+2, xopts[x]);
  34                 args[i++] = s;
  35         }
  36         for (j = common; j; j = j->next)
  37                 args[i++] = xstrdup(merge_argument(j->item));
  38         args[i++] = "--";
  39         args[i++] = head_arg;
  40         for (j = remotes; j; j = j->next)
  41                 args[i++] = xstrdup(merge_argument(j->item));
  42         args[i] = NULL;
  43         ret = run_command_v_opt(args, RUN_GIT_CMD);
  44         strbuf_release(&buf);
  45         i = 1;
  46         for (x = 0; x < xopts_nr; x++)
  47                 free((void *)args[i++]);
  48         for (j = common; j; j = j->next)
  49                 free((void *)args[i++]);
  50         i += 2;
  51         for (j = remotes; j; j = j->next)
  52                 free((void *)args[i++]);
  53         free(args);
  54         discard_cache();
  55         if (read_cache() < 0)
  56                 die(_("failed to read the cache"));
  57         resolve_undo_clear();
  58
  59         return ret;
  60 }
  61
  62 int checkout_fast_forward(const unsigned char *head,
  63                           const unsigned char *remote,
  64                           int overwrite_ignore)
  65 {
  66         struct tree *trees[MAX_UNPACK_TREES];
  67         struct unpack_trees_options opts;
  68         struct tree_desc t[MAX_UNPACK_TREES];
  69         int i, fd, nr_trees = 0;
  70         struct dir_struct dir;
  71         struct lock_file *lock_file = xcalloc(1, sizeof(struct lock_file));
  72
  73         refresh_cache(REFRESH_QUIET);
  74
  75         fd = hold_locked_index(lock_file, 1);
  76
  77         memset(&trees, 0, sizeof(trees));
  78         memset(&opts, 0, sizeof(opts));
  79         memset(&t, 0, sizeof(t));
  80         if (overwrite_ignore) {
  81                 memset(&dir, 0, sizeof(dir));
  82                 dir.flags |= DIR_SHOW_IGNORED;
  83                 setup_standard_excludes(&dir);
  84                 opts.dir = &dir;
  85         }
  86
  87         opts.head_idx = 1;
  88         opts.src_index = &the_index;
  89         opts.dst_index = &the_index;
  90         opts.update = 1;
  91         opts.verbose_update = 1;
  92         opts.merge = 1;
  93         opts.fn = twoway_merge;
  94         setup_unpack_trees_porcelain(&opts, "merge");
  95
  96         trees[nr_trees] = parse_tree_indirect(head);
  97         if (!trees[nr_trees++])
  98                 return -1;
  99         trees[nr_trees] = parse_tree_indirect(remote);
 100         if (!trees[nr_trees++])
 101                 return -1;
 102         for (i = 0; i < nr_trees; i++) {
 103                 parse_tree(trees[i]);
 104                 init_tree_desc(t+i, trees[i]->buffer, trees[i]->size);
 105         }
 106         if (unpack_trees(nr_trees, t, &opts))
 107                 return -1;
 108         if (write_cache(fd, active_cache, active_nr) ||
 109                 commit_locked_index(lock_file))
 110                 die(_("unable to write new index file"));
 111         return 0;
 112 }