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_object(const char *path, enum object_type type, int write_object)
  12 {
  13         int fd;
  14         struct stat st;
  15         unsigned char sha1[20];
  16         fd = open(path, O_RDONLY);
  17         if (fd < 0 ||
  18             fstat(fd, &st) < 0 ||
  19             index_fd(sha1, fd, &st, write_object, type, path))
  20                 die(write_object
  21                     ? "Unable to add %s to database"
  22                     : "Unable to hash %s", path);
  23         printf("%s\n", sha1_to_hex(sha1));
  24         maybe_flush_or_die(stdout, "hash to stdout");
  25 }
  26
  27 static void hash_stdin(const char *type, int write_object)
  28 {
  29         unsigned char sha1[20];
  30         if (index_pipe(sha1, 0, type, write_object))
  31                 die("Unable to add stdin to database");
  32         printf("%s\n", sha1_to_hex(sha1));
  33 }
  34
  35 static void hash_stdin_paths(const char *type, int write_objects)
  36 {
  37         struct strbuf buf, nbuf;
  38
  39         strbuf_init(&buf, 0);
  40         strbuf_init(&nbuf, 0);
  41         while (strbuf_getline(&buf, stdin, '\n') != EOF) {
  42                 if (buf.buf[0] == '"') {
  43                         strbuf_reset(&nbuf);
  44                         if (unquote_c_style(&nbuf, buf.buf, NULL))
  45                                 die("line is badly quoted");
  46                         strbuf_swap(&buf, &nbuf);
  47                 }
  48                 hash_object(buf.buf, type_from_string(type), write_objects);
  49         }
  50         strbuf_release(&buf);
  51         strbuf_release(&nbuf);
  52 }
  53
  54 static const char hash_object_usage[] =
  55 "git-hash-object [ [-t <type>] [-w] [--stdin] <file>... | --stdin-paths < <list-of-paths> ]";
  56
  57 int main(int argc, char **argv)
  58 {
  59         int i;
  60         const char *type = blob_type;
  61         int write_object = 0;
  62         const char *prefix = NULL;
  63         int prefix_length = -1;
  64         int no_more_flags = 0;
  65         int hashstdin = 0;
  66         int stdin_paths = 0;
  67
  68         git_config(git_default_config);
  69
  70         for (i = 1 ; i < argc; i++) {
  71                 if (!no_more_flags && argv[i][0] == '-') {
  72                         if (!strcmp(argv[i], "-t")) {
  73                                 if (argc <= ++i)
  74                                         usage(hash_object_usage);
  75                                 type = argv[i];
  76                         }
  77                         else if (!strcmp(argv[i], "-w")) {
  78                                 if (prefix_length < 0) {
  79                                         prefix = setup_git_directory();
  80                                         prefix_length =
  81                                                 prefix ? strlen(prefix) : 0;
  82                                 }
  83                                 write_object = 1;
  84                         }
  85                         else if (!strcmp(argv[i], "--")) {
  86                                 no_more_flags = 1;
  87                         }
  88                         else if (!strcmp(argv[i], "--help"))
  89                                 usage(hash_object_usage);
  90                         else if (!strcmp(argv[i], "--stdin-paths")) {
  91                                 if (hashstdin) {
  92                                         error("Can't use --stdin-paths with --stdin");
  93                                         usage(hash_object_usage);
  94                                 }
  95                                 stdin_paths = 1;
  96
  97                         }
  98                         else if (!strcmp(argv[i], "--stdin")) {
  99                                 if (stdin_paths) {
 100                                         error("Can't use %s with --stdin-paths", argv[i]);
 101                                         usage(hash_object_usage);
 102                                 }
 103                                 if (hashstdin)
 104                                         die("Multiple --stdin arguments are not supported");
 105                                 hashstdin = 1;
 106                         }
 107                         else
 108                                 usage(hash_object_usage);
 109                 }
 110                 else {
 111                         const char *arg = argv[i];
 112
 113                         if (stdin_paths) {
 114                                 error("Can't specify files (such as \"%s\") with --stdin-paths", arg);
 115                                 usage(hash_object_usage);
 116                         }
 117
 118                         if (hashstdin) {
 119                                 hash_stdin(type, write_object);
 120                                 hashstdin = 0;
 121                         }
 122                         if (0 <= prefix_length)
 123                                 arg = prefix_filename(prefix, prefix_length,
 124                                                       arg);
 125                         hash_object(arg, type_from_string(type), write_object);
 126                         no_more_flags = 1;
 127                 }
 128         }
 129
 130         if (stdin_paths)
 131                 hash_stdin_paths(type, write_object);
 132
 133         if (hashstdin)
 134                 hash_stdin(type, write_object);
 135         return 0;
 136 }