Merge branch 'master' into jc/cache-tree
[git.git] / write-tree.c
1 /*
2  * GIT - The information manager from hell
3  *
4  * Copyright (C) Linus Torvalds, 2005
5  */
6 #include "cache.h"
7 #include "tree.h"
8 #include "cache-tree.h"
9
10 static int missing_ok = 0;
11
12 static const char write_tree_usage[] = "git-write-tree [--missing-ok]";
13
14 static struct cache_file cache_file;
15
16 int main(int argc, char **argv)
17 {
18         int entries, was_valid, newfd;
19
20         setup_git_directory();
21
22         newfd = hold_index_file_for_update(&cache_file, get_index_file());
23         entries = read_cache();
24         if (argc == 2) {
25                 if (!strcmp(argv[1], "--missing-ok"))
26                         missing_ok = 1;
27                 else
28                         die(write_tree_usage);
29         }
30         
31         if (argc > 2)
32                 die("too many options");
33
34         if (entries < 0)
35                 die("git-write-tree: error reading cache");
36
37         if (!active_cache_tree)
38                 active_cache_tree = cache_tree();
39
40         was_valid = cache_tree_fully_valid(active_cache_tree);
41         if (!was_valid) {
42                 if (cache_tree_update(active_cache_tree,
43                                       active_cache, active_nr,
44                                       missing_ok) < 0)
45                         die("git-write-tree: error building trees");
46                 if (0 <= newfd) {
47                         if (!write_cache(newfd, active_cache, active_nr))
48                                 commit_index_file(&cache_file);
49                 }
50                 /* Not being able to write is fine -- we are only interested
51                  * in updating the cache-tree part, and if the next caller
52                  * ends up using the old index with unupdated cache-tree part
53                  * it misses the work we did here, but that is just a
54                  * performance penalty and not a big deal.
55                  */
56         }
57         printf("%s\n", sha1_to_hex(active_cache_tree->sha1));
58         return 0;
59 }