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 "config.h"
   9#include "object-store.h"
  10#include "blob.h"
  11#include "quote.h"
  12#include "parse-options.h"
  13#include "exec-cmd.h"
  14
  15/*
  16 * This is to create corrupt objects for debugging and as such it
  17 * needs to bypass the data conversion performed by, and the type
  18 * limitation imposed by, index_fd() and its callees.
  19 */
  20static int hash_literally(struct object_id *oid, int fd, const char *type, unsigned flags)
  21{
  22        struct strbuf buf = STRBUF_INIT;
  23        int ret;
  24
  25        if (strbuf_read(&buf, fd, 4096) < 0)
  26                ret = -1;
  27        else
  28                ret = hash_object_file_literally(buf.buf, buf.len, type, oid,
  29                                                 flags);
  30        strbuf_release(&buf);
  31        return ret;
  32}
  33
  34static void hash_fd(int fd, const char *type, const char *path, unsigned flags,
  35                    int literally)
  36{
  37        struct stat st;
  38        struct object_id oid;
  39
  40        if (fstat(fd, &st) < 0 ||
  41            (literally
  42             ? hash_literally(&oid, fd, type, flags)
  43             : index_fd(&oid, fd, &st, type_from_string(type), path, flags)))
  44                die((flags & HASH_WRITE_OBJECT)
  45                    ? "Unable to add %s to database"
  46                    : "Unable to hash %s", path);
  47        printf("%s\n", oid_to_hex(&oid));
  48        maybe_flush_or_die(stdout, "hash to stdout");
  49}
  50
  51static void hash_object(const char *path, const char *type, const char *vpath,
  52                        unsigned flags, int literally)
  53{
  54        int fd;
  55        fd = open(path, O_RDONLY);
  56        if (fd < 0)
  57                die_errno("Cannot open '%s'", path);
  58        hash_fd(fd, type, vpath, flags, literally);
  59}
  60
  61static void hash_stdin_paths(const char *type, int no_filters, unsigned flags,
  62                             int literally)
  63{
  64        struct strbuf buf = STRBUF_INIT;
  65        struct strbuf unquoted = STRBUF_INIT;
  66
  67        while (strbuf_getline(&buf, stdin) != EOF) {
  68                if (buf.buf[0] == '"') {
  69                        strbuf_reset(&unquoted);
  70                        if (unquote_c_style(&unquoted, buf.buf, NULL))
  71                                die("line is badly quoted");
  72                        strbuf_swap(&buf, &unquoted);
  73                }
  74                hash_object(buf.buf, type, no_filters ? NULL : buf.buf, flags,
  75                            literally);
  76        }
  77        strbuf_release(&buf);
  78        strbuf_release(&unquoted);
  79}
  80
  81int cmd_hash_object(int argc, const char **argv, const char *prefix)
  82{
  83        static const char * const hash_object_usage[] = {
  84                N_("git hash-object [-t <type>] [-w] [--path=<file> | --no-filters] [--stdin] [--] <file>..."),
  85                N_("git hash-object  --stdin-paths"),
  86                NULL
  87        };
  88        const char *type = blob_type;
  89        int hashstdin = 0;
  90        int stdin_paths = 0;
  91        int no_filters = 0;
  92        int literally = 0;
  93        int nongit = 0;
  94        unsigned flags = HASH_FORMAT_CHECK;
  95        const char *vpath = NULL;
  96        const struct option hash_object_options[] = {
  97                OPT_STRING('t', NULL, &type, N_("type"), N_("object type")),
  98                OPT_BIT('w', NULL, &flags, N_("write the object into the object database"),
  99                        HASH_WRITE_OBJECT),
 100                OPT_COUNTUP( 0 , "stdin", &hashstdin, N_("read the object from stdin")),
 101                OPT_BOOL( 0 , "stdin-paths", &stdin_paths, N_("read file names from stdin")),
 102                OPT_BOOL( 0 , "no-filters", &no_filters, N_("store file as is without filters")),
 103                OPT_BOOL( 0, "literally", &literally, N_("just hash any random garbage to create corrupt objects for debugging Git")),
 104                OPT_STRING( 0 , "path", &vpath, N_("file"), N_("process file as it were from this path")),
 105                OPT_END()
 106        };
 107        int i;
 108        const char *errstr = NULL;
 109
 110        argc = parse_options(argc, argv, NULL, hash_object_options,
 111                             hash_object_usage, 0);
 112
 113        if (flags & HASH_WRITE_OBJECT)
 114                prefix = setup_git_directory();
 115        else
 116                prefix = setup_git_directory_gently(&nongit);
 117
 118        if (vpath && prefix)
 119                vpath = xstrdup(prefix_filename(prefix, vpath));
 120
 121        git_config(git_default_config, NULL);
 122
 123        if (stdin_paths) {
 124                if (hashstdin)
 125                        errstr = "Can't use --stdin-paths with --stdin";
 126                else if (argc)
 127                        errstr = "Can't specify files with --stdin-paths";
 128                else if (vpath)
 129                        errstr = "Can't use --stdin-paths with --path";
 130        }
 131        else {
 132                if (hashstdin > 1)
 133                        errstr = "Multiple --stdin arguments are not supported";
 134                if (vpath && no_filters)
 135                        errstr = "Can't use --path with --no-filters";
 136        }
 137
 138        if (errstr) {
 139                error("%s", errstr);
 140                usage_with_options(hash_object_usage, hash_object_options);
 141        }
 142
 143        if (hashstdin)
 144                hash_fd(0, type, vpath, flags, literally);
 145
 146        for (i = 0 ; i < argc; i++) {
 147                const char *arg = argv[i];
 148                char *to_free = NULL;
 149
 150                if (prefix)
 151                        arg = to_free = prefix_filename(prefix, arg);
 152                hash_object(arg, type, no_filters ? NULL : vpath ? vpath : arg,
 153                            flags, literally);
 154                free(to_free);
 155        }
 156
 157        if (stdin_paths)
 158                hash_stdin_paths(type, no_filters, flags, literally);
 159
 160        return 0;
 161}