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                         const char *vpath)
  27 {
  28         int fd;
  29         fd = open(path, O_RDONLY);
  30         if (fd < 0)
  31                 die("Cannot open %s", path);
  32         hash_fd(fd, type, write_object, vpath);
  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, write_objects, buf.buf);
  49         }
  50         strbuf_release(&buf);
  51         strbuf_release(&nbuf);
  52 }
  53
  54 static const char * const hash_object_usage[] = {
  55         "git hash-object [-t <type>] [-w] [--path=<file>] [--stdin] [--] <file>...",
  56         "git hash-object  --stdin-paths < <list-of-paths>",
  57         NULL
  58 };
  59
  60 static const char *type;
  61 static int write_object;
  62 static int hashstdin;
  63 static int stdin_paths;
  64 static const char *vpath;
  65
  66 static const struct option hash_object_options[] = {
  67         OPT_STRING('t', NULL, &type, "type", "object type"),
  68         OPT_BOOLEAN('w', NULL, &write_object, "write the object into the object database"),
  69         OPT_BOOLEAN( 0 , "stdin", &hashstdin, "read the object from stdin"),
  70         OPT_BOOLEAN( 0 , "stdin-paths", &stdin_paths, "read file names from stdin"),
  71         OPT_STRING( 0 , "path", &vpath, "file", "process file as it were from this path"),
  72         OPT_END()
  73 };
  74
  75 int main(int argc, const char **argv)
  76 {
  77         int i;
  78         const char *prefix = NULL;
  79         int prefix_length = -1;
  80         const char *errstr = NULL;
  81
  82         type = blob_type;
  83
  84         git_config(git_default_config, NULL);
  85
  86         argc = parse_options(argc, argv, hash_object_options, hash_object_usage, 0);
  87
  88         if (write_object) {
  89                 prefix = setup_git_directory();
  90                 prefix_length = prefix ? strlen(prefix) : 0;
  91                 if (vpath && prefix)
  92                         vpath = prefix_filename(prefix, prefix_length, vpath);
  93         }
  94
  95         if (stdin_paths) {
  96                 if (hashstdin)
  97                         errstr = "Can't use --stdin-paths with --stdin";
  98                 else if (argc)
  99                         errstr = "Can't specify files with --stdin-paths";
 100                 else if (vpath)
 101                         errstr = "Can't use --stdin-paths with --path";
 102         }
 103         else if (hashstdin > 1)
 104                 errstr = "Multiple --stdin arguments are not supported";
 105
 106         if (errstr) {
 107                 error (errstr);
 108                 usage_with_options(hash_object_usage, hash_object_options);
 109         }
 110
 111         if (hashstdin)
 112                 hash_fd(0, type, write_object, vpath);
 113
 114         for (i = 0 ; i < argc; i++) {
 115                 const char *arg = argv[i];
 116
 117                 if (0 <= prefix_length)
 118                         arg = prefix_filename(prefix, prefix_length, arg);
 119                 hash_object(arg, type, write_object, vpath ? vpath : arg);
 120         }
 121
 122         if (stdin_paths)
 123                 hash_stdin_paths(type, write_object);
 124
 125         return 0;
 126 }