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 #include "quote.h"
  10
  11 static void hash_fd(int fd, const char *type, int write_object, const char *path)
  12 {
  13         struct stat st;
  14         unsigned char sha1[20];
  15         if (fstat(fd, &st) < 0 ||
  16             index_fd(sha1, fd, &st, write_object, type_from_string(type), path))
  17                 die(write_object
  18                     ? "Unable to add %s to database"
  19                     : "Unable to hash %s", path);
  20         printf("%s\n", sha1_to_hex(sha1));
  21         maybe_flush_or_die(stdout, "hash to stdout");
  22 }
  23
  24 static void hash_object(const char *path, const char *type, int write_object)
  25 {
  26         int fd;
  27         fd = open(path, O_RDONLY);
  28         if (fd < 0)
  29                 die("Cannot open %s", path);
  30         hash_fd(fd, type, write_object, path);
  31 }
  32
  33 static void hash_stdin_paths(const char *type, int write_objects)
  34 {
  35         struct strbuf buf, nbuf;
  36
  37         strbuf_init(&buf, 0);
  38         strbuf_init(&nbuf, 0);
  39         while (strbuf_getline(&buf, stdin, '\n') != EOF) {
  40                 if (buf.buf[0] == '"') {
  41                         strbuf_reset(&nbuf);
  42                         if (unquote_c_style(&nbuf, buf.buf, NULL))
  43                                 die("line is badly quoted");
  44                         strbuf_swap(&buf, &nbuf);
  45                 }
  46                 hash_object(buf.buf, type, write_objects);
  47         }
  48         strbuf_release(&buf);
  49         strbuf_release(&nbuf);
  50 }
  51
  52 static const char hash_object_usage[] =
  53 "git hash-object [-t <type>] [-w] [--stdin] [--] <file>...\n"
  54 "   or: git hash-object  --stdin-paths < <list-of-paths>";
  55
  56 int main(int argc, char **argv)
  57 {
  58         int i;
  59         const char *type = blob_type;
  60         int write_object = 0;
  61         const char *prefix = NULL;
  62         int prefix_length = -1;
  63         int no_more_flags = 0;
  64         int hashstdin = 0;
  65         int stdin_paths = 0;
  66
  67         git_config(git_default_config, NULL);
  68
  69         for (i = 1 ; i < argc; i++) {
  70                 if (!no_more_flags && argv[i][0] == '-') {
  71                         if (!strcmp(argv[i], "-t")) {
  72                                 if (argc <= ++i)
  73                                         usage(hash_object_usage);
  74                                 type = argv[i];
  75                         }
  76                         else if (!strcmp(argv[i], "-w")) {
  77                                 if (prefix_length < 0) {
  78                                         prefix = setup_git_directory();
  79                                         prefix_length =
  80                                                 prefix ? strlen(prefix) : 0;
  81                                 }
  82                                 write_object = 1;
  83                         }
  84                         else if (!strcmp(argv[i], "--")) {
  85                                 no_more_flags = 1;
  86                         }
  87                         else if (!strcmp(argv[i], "--help"))
  88                                 usage(hash_object_usage);
  89                         else if (!strcmp(argv[i], "--stdin-paths")) {
  90                                 if (hashstdin) {
  91                                         error("Can't use --stdin-paths with --stdin");
  92                                         usage(hash_object_usage);
  93                                 }
  94                                 stdin_paths = 1;
  95
  96                         }
  97                         else if (!strcmp(argv[i], "--stdin")) {
  98                                 if (stdin_paths) {
  99                                         error("Can't use %s with --stdin-paths", argv[i]);
 100                                         usage(hash_object_usage);
 101                                 }
 102                                 if (hashstdin)
 103                                         die("Multiple --stdin arguments are not supported");
 104                                 hashstdin = 1;
 105                         }
 106                         else
 107                                 usage(hash_object_usage);
 108                 }
 109                 else {
 110                         const char *arg = argv[i];
 111
 112                         if (stdin_paths) {
 113                                 error("Can't specify files (such as \"%s\") with --stdin-paths", arg);
 114                                 usage(hash_object_usage);
 115                         }
 116
 117                         if (hashstdin) {
 118                                 hash_fd(0, type, write_object, NULL);
 119                                 hashstdin = 0;
 120                         }
 121                         if (0 <= prefix_length)
 122                                 arg = prefix_filename(prefix, prefix_length,
 123                                                       arg);
 124                         hash_object(arg, type, write_object);
 125                         no_more_flags = 1;
 126                 }
 127         }
 128
 129         if (stdin_paths)
 130                 hash_stdin_paths(type, write_object);
 131
 132         if (hashstdin)
 133                 hash_fd(0, type, write_object, NULL);
 134         return 0;
 135 }