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 int no_filters;
  40
  41 static void hash_stdin_paths(const char *type, int write_objects)
  42 {
  43         struct strbuf buf = STRBUF_INIT, nbuf = STRBUF_INIT;
  44
  45         while (strbuf_getline(&buf, stdin, '\n') != EOF) {
  46                 if (buf.buf[0] == '"') {
  47                         strbuf_reset(&nbuf);
  48                         if (unquote_c_style(&nbuf, buf.buf, NULL))
  49                                 die("line is badly quoted");
  50                         strbuf_swap(&buf, &nbuf);
  51                 }
  52                 hash_object(buf.buf, type, write_objects,
  53                     no_filters ? NULL : buf.buf);
  54         }
  55         strbuf_release(&buf);
  56         strbuf_release(&nbuf);
  57 }
  58
  59 static const char * const hash_object_usage[] = {
  60         "git hash-object [-t <type>] [-w] [--path=<file>|--no-filters] [--stdin] [--] <file>...",
  61         "git hash-object  --stdin-paths < <list-of-paths>",
  62         NULL
  63 };
  64
  65 static const char *type;
  66 static int write_object;
  67 static int hashstdin;
  68 static int stdin_paths;
  69 static const char *vpath;
  70
  71 static const struct option hash_object_options[] = {
  72         OPT_STRING('t', NULL, &type, "type", "object type"),
  73         OPT_BOOLEAN('w', NULL, &write_object, "write the object into the object database"),
  74         OPT_BOOLEAN( 0 , "stdin", &hashstdin, "read the object from stdin"),
  75         OPT_BOOLEAN( 0 , "stdin-paths", &stdin_paths, "read file names from stdin"),
  76         OPT_BOOLEAN( 0 , "no-filters", &no_filters, "store file as is without filters"),
  77         OPT_STRING( 0 , "path", &vpath, "file", "process file as it were from this path"),
  78         OPT_END()
  79 };
  80
  81 int cmd_hash_object(int argc, const char **argv, const char *prefix)
  82 {
  83         int i;
  84         int prefix_length = -1;
  85         const char *errstr = NULL;
  86
  87         type = blob_type;
  88
  89         argc = parse_options(argc, argv, NULL, hash_object_options,
  90                              hash_object_usage, 0);
  91
  92         if (write_object) {
  93                 prefix = setup_git_directory();
  94                 prefix_length = prefix ? strlen(prefix) : 0;
  95                 if (vpath && prefix)
  96                         vpath = prefix_filename(prefix, prefix_length, vpath);
  97         }
  98
  99         git_config(git_default_config, NULL);
 100
 101         if (stdin_paths) {
 102                 if (hashstdin)
 103                         errstr = "Can't use --stdin-paths with --stdin";
 104                 else if (argc)
 105                         errstr = "Can't specify files with --stdin-paths";
 106                 else if (vpath)
 107                         errstr = "Can't use --stdin-paths with --path";
 108         }
 109         else {
 110                 if (hashstdin > 1)
 111                         errstr = "Multiple --stdin arguments are not supported";
 112                 if (vpath && no_filters)
 113                         errstr = "Can't use --path with --no-filters";
 114         }
 115
 116         if (errstr) {
 117                 error("%s", errstr);
 118                 usage_with_options(hash_object_usage, hash_object_options);
 119         }
 120
 121         if (hashstdin)
 122                 hash_fd(0, type, write_object, vpath);
 123
 124         for (i = 0 ; i < argc; i++) {
 125                 const char *arg = argv[i];
 126
 127                 if (0 <= prefix_length)
 128                         arg = prefix_filename(prefix, prefix_length, arg);
 129                 hash_object(arg, type, write_object,
 130                             no_filters ? NULL : vpath ? vpath : arg);
 131         }
 132
 133         if (stdin_paths)
 134                 hash_stdin_paths(type, write_object);
 135
 136         return 0;
 137 }