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 "cache.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         if (fstat(fd, &st) < 0 ||
  18             index_fd(sha1, fd, &st, write_object, type_from_string(type), path))
  19                 die(write_object
  20                     ? "Unable to add %s to database"
  21                     : "Unable to hash %s", path);
  22         printf("%s\n", sha1_to_hex(sha1));
  23         maybe_flush_or_die(stdout, "hash to stdout");
  24 }
  25
  26 static void hash_object(const char *path, const char *type, int write_object,
  27                         const char *vpath)
  28 {
  29         int fd;
  30         fd = open(path, O_RDONLY);
  31         if (fd < 0)
  32                 die_errno("Cannot open '%s'", path);
  33         hash_fd(fd, type, write_object, vpath);
  34 }
  35
  36 static int no_filters;
  37
  38 static void hash_stdin_paths(const char *type, int write_objects)
  39 {
  40         struct strbuf buf = STRBUF_INIT, nbuf = STRBUF_INIT;
  41
  42         while (strbuf_getline(&buf, stdin, '\n') != EOF) {
  43                 if (buf.buf[0] == '"') {
  44                         strbuf_reset(&nbuf);
  45                         if (unquote_c_style(&nbuf, buf.buf, NULL))
  46                                 die("line is badly quoted");
  47                         strbuf_swap(&buf, &nbuf);
  48                 }
  49                 hash_object(buf.buf, type, write_objects,
  50                     no_filters ? NULL : buf.buf);
  51         }
  52         strbuf_release(&buf);
  53         strbuf_release(&nbuf);
  54 }
  55
  56 static const char * const hash_object_usage[] = {
  57         "git hash-object [-t <type>] [-w] [--path=<file>|--no-filters] [--stdin] [--] <file>...",
  58         "git hash-object  --stdin-paths < <list-of-paths>",
  59         NULL
  60 };
  61
  62 static const char *type;
  63 static int write_object;
  64 static int hashstdin;
  65 static int stdin_paths;
  66 static const char *vpath;
  67
  68 static const struct option hash_object_options[] = {
  69         OPT_STRING('t', NULL, &type, "type", "object type"),
  70         OPT_BOOLEAN('w', NULL, &write_object, "write the object into the object database"),
  71         OPT_BOOLEAN( 0 , "stdin", &hashstdin, "read the object from stdin"),
  72         OPT_BOOLEAN( 0 , "stdin-paths", &stdin_paths, "read file names from stdin"),
  73         OPT_BOOLEAN( 0 , "no-filters", &no_filters, "store file as is without filters"),
  74         OPT_STRING( 0 , "path", &vpath, "file", "process file as it were from this path"),
  75         OPT_END()
  76 };
  77
  78 int cmd_hash_object(int argc, const char **argv, const char *prefix)
  79 {
  80         int i;
  81         int prefix_length = -1;
  82         const char *errstr = NULL;
  83
  84         type = blob_type;
  85
  86         argc = parse_options(argc, argv, NULL, hash_object_options,
  87                              hash_object_usage, 0);
  88
  89         if (write_object) {
  90                 prefix = setup_git_directory();
  91                 prefix_length = prefix ? strlen(prefix) : 0;
  92                 if (vpath && prefix)
  93                         vpath = prefix_filename(prefix, prefix_length, vpath);
  94         }
  95
  96         git_config(git_default_config, NULL);
  97
  98         if (stdin_paths) {
  99                 if (hashstdin)
 100                         errstr = "Can't use --stdin-paths with --stdin";
 101                 else if (argc)
 102                         errstr = "Can't specify files with --stdin-paths";
 103                 else if (vpath)
 104                         errstr = "Can't use --stdin-paths with --path";
 105         }
 106         else {
 107                 if (hashstdin > 1)
 108                         errstr = "Multiple --stdin arguments are not supported";
 109                 if (vpath && no_filters)
 110                         errstr = "Can't use --path with --no-filters";
 111         }
 112
 113         if (errstr) {
 114                 error("%s", errstr);
 115                 usage_with_options(hash_object_usage, hash_object_options);
 116         }
 117
 118         if (hashstdin)
 119                 hash_fd(0, type, write_object, vpath);
 120
 121         for (i = 0 ; i < argc; i++) {
 122                 const char *arg = argv[i];
 123
 124                 if (0 <= prefix_length)
 125                         arg = prefix_filename(prefix, prefix_length, arg);
 126                 hash_object(arg, type, write_object,
 127                             no_filters ? NULL : vpath ? vpath : arg);
 128         }
 129
 130         if (stdin_paths)
 131                 hash_stdin_paths(type, write_object);
 132
 133         return 0;
 134 }