Documentation/describe: improve one-line summary
[git.git] / merge.c
blobfcff632bd63a113ca78b0bd86da1e6af8bc6f7dc
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"
10 static const char *merge_argument(struct commit *commit)
12 if (commit)
13 return sha1_to_hex(commit->object.sha1);
14 else
15 return EMPTY_TREE_SHA1_HEX;
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)
22 struct argv_array args = ARGV_ARRAY_INIT;
23 int i, ret;
24 struct commit_list *j;
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));
36 ret = run_command_v_opt(args.argv, RUN_GIT_CMD);
37 argv_array_clear(&args);
39 discard_cache();
40 if (read_cache() < 0)
41 die(_("failed to read the cache"));
42 resolve_undo_clear();
44 return ret;
47 int checkout_fast_forward(const unsigned char *head,
48 const unsigned char *remote,
49 int overwrite_ignore)
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));
58 refresh_cache(REFRESH_QUIET);
60 hold_locked_index(lock_file, 1);
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;
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");
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);
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;