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>... | --stdin-paths < <list-of-paths> ]";
  54
  55 int main(int argc, char **argv)
  56 {
  57         int i;
  58         const char *type = blob_type;
  59         int write_object = 0;
  60         const char *prefix = NULL;
  61         int prefix_length = -1;
  62         int no_more_flags = 0;
  63         int hashstdin = 0;
  64         int stdin_paths = 0;
  65
  66         git_config(git_default_config, NULL);
  67
  68         for (i = 1 ; i < argc; i++) {
  69                 if (!no_more_flags && argv[i][0] == '-') {
  70                         if (!strcmp(argv[i], "-t")) {
  71                                 if (argc <= ++i)
  72                                         usage(hash_object_usage);
  73                                 type = argv[i];
  74                         }
  75                         else if (!strcmp(argv[i], "-w")) {
  76                                 if (prefix_length < 0) {
  77                                         prefix = setup_git_directory();
  78                                         prefix_length =
  79                                                 prefix ? strlen(prefix) : 0;
  80                                 }
  81                                 write_object = 1;
  82                         }
  83                         else if (!strcmp(argv[i], "--")) {
  84                                 no_more_flags = 1;
  85                         }
  86                         else if (!strcmp(argv[i], "--help"))
  87                                 usage(hash_object_usage);
  88                         else if (!strcmp(argv[i], "--stdin-paths")) {
  89                                 if (hashstdin) {
  90                                         error("Can't use --stdin-paths with --stdin");
  91                                         usage(hash_object_usage);
  92                                 }
  93                                 stdin_paths = 1;
  94
  95                         }
  96                         else if (!strcmp(argv[i], "--stdin")) {
  97                                 if (stdin_paths) {
  98                                         error("Can't use %s with --stdin-paths", argv[i]);
  99                                         usage(hash_object_usage);
 100                                 }
 101                                 if (hashstdin)
 102                                         die("Multiple --stdin arguments are not supported");
 103                                 hashstdin = 1;
 104                         }
 105                         else
 106                                 usage(hash_object_usage);
 107                 }
 108                 else {
 109                         const char *arg = argv[i];
 110
 111                         if (stdin_paths) {
 112                                 error("Can't specify files (such as \"%s\") with --stdin-paths", arg);
 113                                 usage(hash_object_usage);
 114                         }
 115
 116                         if (hashstdin) {
 117                                 hash_fd(0, type, write_object, NULL);
 118                                 hashstdin = 0;
 119                         }
 120                         if (0 <= prefix_length)
 121                                 arg = prefix_filename(prefix, prefix_length,
 122                                                       arg);
 123                         hash_object(arg, type, write_object);
 124                         no_more_flags = 1;
 125                 }
 126         }
 127
 128         if (stdin_paths)
 129                 hash_stdin_paths(type, write_object);
 130
 131         if (hashstdin)
 132                 hash_fd(0, type, write_object, NULL);
 133         return 0;
 134 }