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, const char *path, unsigned flags)
  14 {
  15         struct stat st;
  16         unsigned char sha1[20];
  17
  18         if (fstat(fd, &st) < 0 ||
  19             index_fd(sha1, fd, &st, type_from_string(type), path, flags))
  20                 die((flags & HASH_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_object(const char *path, const char *type, const char *vpath,
  28                         unsigned flags)
  29 {
  30         int fd;
  31         fd = open(path, O_RDONLY);
  32         if (fd < 0)
  33                 die_errno("Cannot open '%s'", path);
  34         hash_fd(fd, type, vpath, flags);
  35 }
  36
  37 static void hash_stdin_paths(const char *type, int no_filters, unsigned flags)
  38 {
  39         struct strbuf buf = STRBUF_INIT, nbuf = STRBUF_INIT;
  40
  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, no_filters ? NULL : buf.buf, flags);
  49         }
  50         strbuf_release(&buf);
  51         strbuf_release(&nbuf);
  52 }
  53
  54 int cmd_hash_object(int argc, const char **argv, const char *prefix)
  55 {
  56         static const char * const hash_object_usage[] = {
  57                 N_("git hash-object [-t <type>] [-w] [--path=<file>|--no-filters] [--stdin] [--] <file>..."),
  58                 N_("git hash-object  --stdin-paths < <list-of-paths>"),
  59                 NULL
  60         };
  61         const char *type = blob_type;
  62         int hashstdin = 0;
  63         int stdin_paths = 0;
  64         int no_filters = 0;
  65         unsigned flags = HASH_FORMAT_CHECK;
  66         const char *vpath = NULL;
  67         const struct option hash_object_options[] = {
  68                 OPT_STRING('t', NULL, &type, N_("type"), N_("object type")),
  69                 OPT_BIT('w', NULL, &flags, N_("write the object into the object database"),
  70                         HASH_WRITE_OBJECT),
  71                 OPT_COUNTUP( 0 , "stdin", &hashstdin, N_("read the object from stdin")),
  72                 OPT_BOOL( 0 , "stdin-paths", &stdin_paths, N_("read file names from stdin")),
  73                 OPT_BOOL( 0 , "no-filters", &no_filters, N_("store file as is without filters")),
  74                 OPT_STRING( 0 , "path", &vpath, N_("file"), N_("process file as it were from this path")),
  75                 OPT_END()
  76         };
  77         int i;
  78         int prefix_length = -1;
  79         const char *errstr = NULL;
  80
  81         argc = parse_options(argc, argv, NULL, hash_object_options,
  82                              hash_object_usage, 0);
  83
  84         if (flags & HASH_WRITE_OBJECT) {
  85                 prefix = setup_git_directory();
  86                 prefix_length = prefix ? strlen(prefix) : 0;
  87                 if (vpath && prefix)
  88                         vpath = prefix_filename(prefix, prefix_length, vpath);
  89         }
  90
  91         git_config(git_default_config, NULL);
  92
  93         if (stdin_paths) {
  94                 if (hashstdin)
  95                         errstr = "Can't use --stdin-paths with --stdin";
  96                 else if (argc)
  97                         errstr = "Can't specify files with --stdin-paths";
  98                 else if (vpath)
  99                         errstr = "Can't use --stdin-paths with --path";
 100         }
 101         else {
 102                 if (hashstdin > 1)
 103                         errstr = "Multiple --stdin arguments are not supported";
 104                 if (vpath && no_filters)
 105                         errstr = "Can't use --path with --no-filters";
 106         }
 107
 108         if (errstr) {
 109                 error("%s", errstr);
 110                 usage_with_options(hash_object_usage, hash_object_options);
 111         }
 112
 113         if (hashstdin)
 114                 hash_fd(0, type, vpath, flags);
 115
 116         for (i = 0 ; i < argc; i++) {
 117                 const char *arg = argv[i];
 118
 119                 if (0 <= prefix_length)
 120                         arg = prefix_filename(prefix, prefix_length, arg);
 121                 hash_object(arg, type, no_filters ? NULL : vpath ? vpath : arg,
 122                             flags);
 123         }
 124
 125         if (stdin_paths)
 126                 hash_stdin_paths(type, no_filters, flags);
 127
 128         return 0;
 129 }