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 static char *prefix = NULL;
  12
  13 static const char write_tree_usage[] =
  14 "git-write-tree [--missing-ok] [--prefix=<prefix>/]";
  15
  16 static struct lock_file lock_file;
  17
  18 int main(int argc, char **argv)
  19 {
  20         int entries, was_valid, newfd;
  21
  22         setup_git_directory();
  23
  24         newfd = hold_lock_file_for_update(&lock_file, get_index_file());
  25         entries = read_cache();
  26
  27         while (1 < argc) {
  28                 char *arg = argv[1];
  29                 if (!strcmp(arg, "--missing-ok"))
  30                         missing_ok = 1;
  31                 else if (!strncmp(arg, "--prefix=", 9))
  32                         prefix = arg + 9;
  33                 else
  34                         die(write_tree_usage);
  35                 argc--; argv++;
  36         }
  37
  38         if (argc > 2)
  39                 die("too many options");
  40
  41         if (entries < 0)
  42                 die("git-write-tree: error reading cache");
  43
  44         if (!active_cache_tree)
  45                 active_cache_tree = cache_tree();
  46
  47         was_valid = cache_tree_fully_valid(active_cache_tree);
  48         if (!was_valid) {
  49                 if (cache_tree_update(active_cache_tree,
  50                                       active_cache, active_nr,
  51                                       missing_ok, 0) < 0)
  52                         die("git-write-tree: error building trees");
  53                 if (0 <= newfd) {
  54                         if (!write_cache(newfd, active_cache, active_nr))
  55                                 commit_lock_file(&lock_file);
  56                 }
  57                 /* Not being able to write is fine -- we are only interested
  58                  * in updating the cache-tree part, and if the next caller
  59                  * ends up using the old index with unupdated cache-tree part
  60                  * it misses the work we did here, but that is just a
  61                  * performance penalty and not a big deal.
  62                  */
  63         }
  64         if (prefix) {
  65                 struct cache_tree *subtree =
  66                         cache_tree_find(active_cache_tree, prefix);
  67                 printf("%s\n", sha1_to_hex(subtree->sha1));
  68         }
  69         else
  70                 printf("%s\n", sha1_to_hex(active_cache_tree->sha1));
  71         return 0;
  72 }