builtin/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 "builtin.h"
   8 #include "blob.h"
   9 #include "quote.h"
  10 #include "parse-options.h"
  11 #include "exec_cmd.h"
  12
  13 static void hash_fd(int fd, const char *type, int write_object, const char *path)
  14 {
  15         struct stat st;
  16         unsigned char sha1[20];
  17         unsigned flags = (HASH_FORMAT_CHECK |
  18                           (write_object ? HASH_WRITE_OBJECT : 0));
  19
  20         if (fstat(fd, &st) < 0 ||
  21             index_fd(sha1, fd, &st, type_from_string(type), path, flags))
  22                 die(write_object
  23                     ? "Unable to add %s to database"
  24                     : "Unable to hash %s", path);
  25         printf("%s\n", sha1_to_hex(sha1));
  26         maybe_flush_or_die(stdout, "hash to stdout");
  27 }
  28
  29 static void hash_object(const char *path, const char *type, int write_object,
  30                         const char *vpath)
  31 {
  32         int fd;
  33         fd = open(path, O_RDONLY);
  34         if (fd < 0)
  35                 die_errno("Cannot open '%s'", path);
  36         hash_fd(fd, type, write_object, vpath);
  37 }
  38
  39 static void hash_stdin_paths(const char *type, int write_objects, int no_filters)
  40 {
  41         struct strbuf buf = STRBUF_INIT, nbuf = STRBUF_INIT;
  42
  43         while (strbuf_getline(&buf, stdin, '\n') != EOF) {
  44                 if (buf.buf[0] == '"') {
  45                         strbuf_reset(&nbuf);
  46                         if (unquote_c_style(&nbuf, buf.buf, NULL))
  47                                 die("line is badly quoted");
  48                         strbuf_swap(&buf, &nbuf);
  49                 }
  50                 hash_object(buf.buf, type, write_objects,
  51                             no_filters ? NULL : buf.buf);
  52         }
  53         strbuf_release(&buf);
  54         strbuf_release(&nbuf);
  55 }
  56
  57 int cmd_hash_object(int argc, const char **argv, const char *prefix)
  58 {
  59         static const char * const hash_object_usage[] = {
  60                 N_("git hash-object [-t <type>] [-w] [--path=<file>|--no-filters] [--stdin] [--] <file>..."),
  61                 N_("git hash-object  --stdin-paths < <list-of-paths>"),
  62                 NULL
  63         };
  64         const char *type = blob_type;
  65         int hashstdin = 0;
  66         int stdin_paths = 0;
  67         int write_object = 0;
  68         int no_filters = 0;
  69         const char *vpath = NULL;
  70         const struct option hash_object_options[] = {
  71                 OPT_STRING('t', NULL, &type, N_("type"), N_("object type")),
  72                 OPT_BOOL('w', NULL, &write_object, N_("write the object into the object database")),
  73                 OPT_COUNTUP( 0 , "stdin", &hashstdin, N_("read the object from stdin")),
  74                 OPT_BOOL( 0 , "stdin-paths", &stdin_paths, N_("read file names from stdin")),
  75                 OPT_BOOL( 0 , "no-filters", &no_filters, N_("store file as is without filters")),
  76                 OPT_STRING( 0 , "path", &vpath, N_("file"), N_("process file as it were from this path")),
  77                 OPT_END()
  78         };
  79         int i;
  80         int prefix_length = -1;
  81         const char *errstr = NULL;
  82
  83         argc = parse_options(argc, argv, NULL, hash_object_options,
  84                              hash_object_usage, 0);
  85
  86         if (write_object) {
  87                 prefix = setup_git_directory();
  88                 prefix_length = prefix ? strlen(prefix) : 0;
  89                 if (vpath && prefix)
  90                         vpath = prefix_filename(prefix, prefix_length, vpath);
  91         }
  92
  93         git_config(git_default_config, NULL);
  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 {
 104                 if (hashstdin > 1)
 105                         errstr = "Multiple --stdin arguments are not supported";
 106                 if (vpath && no_filters)
 107                         errstr = "Can't use --path with --no-filters";
 108         }
 109
 110         if (errstr) {
 111                 error("%s", errstr);
 112                 usage_with_options(hash_object_usage, hash_object_options);
 113         }
 114
 115         if (hashstdin)
 116                 hash_fd(0, type, write_object, vpath);
 117
 118         for (i = 0 ; i < argc; i++) {
 119                 const char *arg = argv[i];
 120
 121                 if (0 <= prefix_length)
 122                         arg = prefix_filename(prefix, prefix_length, arg);
 123                 hash_object(arg, type, write_object,
 124                             no_filters ? NULL : vpath ? vpath : arg);
 125         }
 126
 127         if (stdin_paths)
 128                 hash_stdin_paths(type, write_object, no_filters);
 129
 130         return 0;
 131 }