Andrew's git - gitweb.git/blob - 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
  13static 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
  29static 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
  39static int no_filters;
  40
  41static 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
  59static 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
  65static const char *type;
  66static int write_object;
  67static int hashstdin;
  68static int stdin_paths;
  69static const char *vpath;
  70
  71static const struct option hash_object_options[] = {
  72        OPT_STRING('t', NULL, &type, N_("type"), N_("object type")),
  73        OPT_BOOL('w', NULL, &write_object, N_("write the object into the object database")),
  74        OPT_BOOLEAN( 0 , "stdin", &hashstdin, N_("read the object from stdin")),
  75        OPT_BOOL( 0 , "stdin-paths", &stdin_paths, N_("read file names from stdin")),
  76        OPT_BOOL( 0 , "no-filters", &no_filters, N_("store file as is without filters")),
  77        OPT_STRING( 0 , "path", &vpath, N_("file"), N_("process file as it were from this path")),
  78        OPT_END()
  79};
  80
  81int 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}