builtin / hash-object.con commit Sync with 2.12.5 (1df0306)
   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/*
  14 * This is to create corrupt objects for debugging and as such it
  15 * needs to bypass the data conversion performed by, and the type
  16 * limitation imposed by, index_fd() and its callees.
  17 */
  18static int hash_literally(unsigned char *sha1, int fd, const char *type, unsigned flags)
  19{
  20        struct strbuf buf = STRBUF_INIT;
  21        int ret;
  22
  23        if (strbuf_read(&buf, fd, 4096) < 0)
  24                ret = -1;
  25        else
  26                ret = hash_sha1_file_literally(buf.buf, buf.len, type, sha1, flags);
  27        strbuf_release(&buf);
  28        return ret;
  29}
  30
  31static void hash_fd(int fd, const char *type, const char *path, unsigned flags,
  32                    int literally)
  33{
  34        struct stat st;
  35        unsigned char sha1[20];
  36
  37        if (fstat(fd, &st) < 0 ||
  38            (literally
  39             ? hash_literally(sha1, fd, type, flags)
  40             : index_fd(sha1, fd, &st, type_from_string(type), path, flags)))
  41                die((flags & HASH_WRITE_OBJECT)
  42                    ? "Unable to add %s to database"
  43                    : "Unable to hash %s", path);
  44        printf("%s\n", sha1_to_hex(sha1));
  45        maybe_flush_or_die(stdout, "hash to stdout");
  46}
  47
  48static void hash_object(const char *path, const char *type, const char *vpath,
  49                        unsigned flags, int literally)
  50{
  51        int fd;
  52        fd = open(path, O_RDONLY);
  53        if (fd < 0)
  54                die_errno("Cannot open '%s'", path);
  55        hash_fd(fd, type, vpath, flags, literally);
  56}
  57
  58static void hash_stdin_paths(const char *type, int no_filters, unsigned flags,
  59                             int literally)
  60{
  61        struct strbuf buf = STRBUF_INIT;
  62        struct strbuf unquoted = STRBUF_INIT;
  63
  64        while (strbuf_getline(&buf, stdin) != EOF) {
  65                if (buf.buf[0] == '"') {
  66                        strbuf_reset(&unquoted);
  67                        if (unquote_c_style(&unquoted, buf.buf, NULL))
  68                                die("line is badly quoted");
  69                        strbuf_swap(&buf, &unquoted);
  70                }
  71                hash_object(buf.buf, type, no_filters ? NULL : buf.buf, flags,
  72                            literally);
  73        }
  74        strbuf_release(&buf);
  75        strbuf_release(&unquoted);
  76}
  77
  78int cmd_hash_object(int argc, const char **argv, const char *prefix)
  79{
  80        static const char * const hash_object_usage[] = {
  81                N_("git hash-object [-t <type>] [-w] [--path=<file> | --no-filters] [--stdin] [--] <file>..."),
  82                N_("git hash-object  --stdin-paths"),
  83                NULL
  84        };
  85        const char *type = blob_type;
  86        int hashstdin = 0;
  87        int stdin_paths = 0;
  88        int no_filters = 0;
  89        int literally = 0;
  90        int nongit = 0;
  91        unsigned flags = HASH_FORMAT_CHECK;
  92        const char *vpath = NULL;
  93        const struct option hash_object_options[] = {
  94                OPT_STRING('t', NULL, &type, N_("type"), N_("object type")),
  95                OPT_BIT('w', NULL, &flags, N_("write the object into the object database"),
  96                        HASH_WRITE_OBJECT),
  97                OPT_COUNTUP( 0 , "stdin", &hashstdin, N_("read the object from stdin")),
  98                OPT_BOOL( 0 , "stdin-paths", &stdin_paths, N_("read file names from stdin")),
  99                OPT_BOOL( 0 , "no-filters", &no_filters, N_("store file as is without filters")),
 100                OPT_BOOL( 0, "literally", &literally, N_("just hash any random garbage to create corrupt objects for debugging Git")),
 101                OPT_STRING( 0 , "path", &vpath, N_("file"), N_("process file as it were from this path")),
 102                OPT_END()
 103        };
 104        int i;
 105        const char *errstr = NULL;
 106
 107        argc = parse_options(argc, argv, NULL, hash_object_options,
 108                             hash_object_usage, 0);
 109
 110        if (flags & HASH_WRITE_OBJECT)
 111                prefix = setup_git_directory();
 112        else
 113                prefix = setup_git_directory_gently(&nongit);
 114
 115        if (vpath && prefix)
 116                vpath = xstrdup(prefix_filename(prefix, vpath));
 117
 118        git_config(git_default_config, NULL);
 119
 120        if (stdin_paths) {
 121                if (hashstdin)
 122                        errstr = "Can't use --stdin-paths with --stdin";
 123                else if (argc)
 124                        errstr = "Can't specify files with --stdin-paths";
 125                else if (vpath)
 126                        errstr = "Can't use --stdin-paths with --path";
 127        }
 128        else {
 129                if (hashstdin > 1)
 130                        errstr = "Multiple --stdin arguments are not supported";
 131                if (vpath && no_filters)
 132                        errstr = "Can't use --path with --no-filters";
 133        }
 134
 135        if (errstr) {
 136                error("%s", errstr);
 137                usage_with_options(hash_object_usage, hash_object_options);
 138        }
 139
 140        if (hashstdin)
 141                hash_fd(0, type, vpath, flags, literally);
 142
 143        for (i = 0 ; i < argc; i++) {
 144                const char *arg = argv[i];
 145                char *to_free = NULL;
 146
 147                if (prefix)
 148                        arg = to_free = prefix_filename(prefix, arg);
 149                hash_object(arg, type, no_filters ? NULL : vpath ? vpath : arg,
 150                            flags, literally);
 151                free(to_free);
 152        }
 153
 154        if (stdin_paths)
 155                hash_stdin_paths(type, no_filters, flags, literally);
 156
 157        return 0;
 158}