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