hash-object.c

   1 /*
   2  * GIT - The information manager from hell
   3  *
   4  * Copyright (C) Linus Torvalds, 2005
   5  * Copyright (C) Junio C Hamano, 2005
   6  */
   7 #include "cache.h"
   8
   9 static void hash_object(const char *path, const char *type, int write_object)
  10 {
  11         int fd;
  12         struct stat st;
  13         unsigned char sha1[20];
  14         fd = open(path, O_RDONLY);
  15         if (fd < 0 ||
  16             fstat(fd, &st) < 0 ||
  17             index_fd(sha1, fd, &st, write_object, type))
  18                 die(write_object
  19                     ? "Unable to add %s to database"
  20                     : "Unable to hash %s", path);
  21         printf("%s\n", sha1_to_hex(sha1));
  22 }
  23
  24 static void hash_stdin(const char *type, int write_object)
  25 {
  26         unsigned char sha1[20];
  27         if (index_pipe(sha1, 0, type, write_object))
  28                 die("Unable to add stdin to database");
  29         printf("%s\n", sha1_to_hex(sha1));
  30 }
  31
  32 static const char hash_object_usage[] =
  33 "git-hash-object [-t <type>] [-w] [--stdin] <file>...";
  34
  35 int main(int argc, char **argv)
  36 {
  37         int i;
  38         const char *type = "blob";
  39         int write_object = 0;
  40         const char *prefix = NULL;
  41         int prefix_length = -1;
  42         int no_more_flags = 0;
  43
  44         for (i = 1 ; i < argc; i++) {
  45                 if (!no_more_flags && argv[i][0] == '-') {
  46                         if (!strcmp(argv[i], "-t")) {
  47                                 if (argc <= ++i)
  48                                         die(hash_object_usage);
  49                                 type = argv[i];
  50                         }
  51                         else if (!strcmp(argv[i], "-w")) {
  52                                 if (prefix_length < 0) {
  53                                         prefix = setup_git_directory();
  54                                         prefix_length =
  55                                                 prefix ? strlen(prefix) : 0;
  56                                 }
  57                                 write_object = 1;
  58                         }
  59                         else if (!strcmp(argv[i], "--")) {
  60                                 no_more_flags = 1;
  61                         }
  62                         else if (!strcmp(argv[i], "--help"))
  63                                 usage(hash_object_usage);
  64                         else if (!strcmp(argv[i], "--stdin")) {
  65                                 hash_stdin(type, write_object);
  66                         }
  67                         else
  68                                 die(hash_object_usage);
  69                 }
  70                 else {
  71                         const char *arg = argv[i];
  72                         if (0 <= prefix_length)
  73                                 arg = prefix_filename(prefix, prefix_length,
  74                                                       arg);
  75                         hash_object(arg, type, write_object);
  76                         no_more_flags = 1;
  77                 }
  78         }
  79         return 0;
  80 }