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 #include "blob.h"
   9
  10 static void hash_object(const char *path, const char *type, int write_object)
  11 {
  12         int fd;
  13         struct stat st;
  14         unsigned char sha1[20];
  15         fd = open(path, O_RDONLY);
  16         if (fd < 0 ||
  17             fstat(fd, &st) < 0 ||
  18             index_fd(sha1, fd, &st, write_object, type))
  19                 die(write_object
  20                     ? "Unable to add %s to database"
  21                     : "Unable to hash %s", path);
  22         printf("%s\n", sha1_to_hex(sha1));
  23 }
  24
  25 static void hash_stdin(const char *type, int write_object)
  26 {
  27         unsigned char sha1[20];
  28         if (index_pipe(sha1, 0, type, write_object))
  29                 die("Unable to add stdin to database");
  30         printf("%s\n", sha1_to_hex(sha1));
  31 }
  32
  33 static const char hash_object_usage[] =
  34 "git-hash-object [-t <type>] [-w] [--stdin] <file>...";
  35
  36 int main(int argc, char **argv)
  37 {
  38         int i;
  39         const char *type = blob_type;
  40         int write_object = 0;
  41         const char *prefix = NULL;
  42         int prefix_length = -1;
  43         int no_more_flags = 0;
  44
  45         for (i = 1 ; i < argc; i++) {
  46                 if (!no_more_flags && argv[i][0] == '-') {
  47                         if (!strcmp(argv[i], "-t")) {
  48                                 if (argc <= ++i)
  49                                         die(hash_object_usage);
  50                                 type = argv[i];
  51                         }
  52                         else if (!strcmp(argv[i], "-w")) {
  53                                 if (prefix_length < 0) {
  54                                         prefix = setup_git_directory();
  55                                         prefix_length =
  56                                                 prefix ? strlen(prefix) : 0;
  57                                 }
  58                                 write_object = 1;
  59                         }
  60                         else if (!strcmp(argv[i], "--")) {
  61                                 no_more_flags = 1;
  62                         }
  63                         else if (!strcmp(argv[i], "--help"))
  64                                 usage(hash_object_usage);
  65                         else if (!strcmp(argv[i], "--stdin")) {
  66                                 hash_stdin(type, write_object);
  67                         }
  68                         else
  69                                 die(hash_object_usage);
  70                 }
  71                 else {
  72                         const char *arg = argv[i];
  73                         if (0 <= prefix_length)
  74                                 arg = prefix_filename(prefix, prefix_length,
  75                                                       arg);
  76                         hash_object(arg, type, write_object);
  77                         no_more_flags = 1;
  78                 }
  79         }
  80         return 0;
  81 }