Andrew's git - gitweb.git/blob - builtin/cat-file.c

   1/*
   2 * GIT - The information manager from hell
   3 *
   4 * Copyright (C) Linus Torvalds, 2005
   5 */
   6#include "cache.h"
   7#include "exec_cmd.h"
   8#include "tag.h"
   9#include "tree.h"
  10#include "builtin.h"
  11#include "parse-options.h"
  12
  13#define BATCH 1
  14#define BATCH_CHECK 2
  15
  16static void pprint_tag(const unsigned char *sha1, const char *buf, unsigned long size)
  17{
  18        /* the parser in tag.c is useless here. */
  19        const char *endp = buf + size;
  20        const char *cp = buf;
  21
  22        while (cp < endp) {
  23                char c = *cp++;
  24                if (c != '\n')
  25                        continue;
  26                if (7 <= endp - cp && !memcmp("tagger ", cp, 7)) {
  27                        const char *tagger = cp;
  28
  29                        /* Found the tagger line.  Copy out the contents
  30                         * of the buffer so far.
  31                         */
  32                        write_or_die(1, buf, cp - buf);
  33
  34                        /*
  35                         * Do something intelligent, like pretty-printing
  36                         * the date.
  37                         */
  38                        while (cp < endp) {
  39                                if (*cp++ == '\n') {
  40                                        /* tagger to cp is a line
  41                                         * that has ident and time.
  42                                         */
  43                                        const char *sp = tagger;
  44                                        char *ep;
  45                                        unsigned long date;
  46                                        long tz;
  47                                        while (sp < cp && *sp != '>')
  48                                                sp++;
  49                                        if (sp == cp) {
  50                                                /* give up */
  51                                                write_or_die(1, tagger,
  52                                                             cp - tagger);
  53                                                break;
  54                                        }
  55                                        while (sp < cp &&
  56                                               !('0' <= *sp && *sp <= '9'))
  57                                                sp++;
  58                                        write_or_die(1, tagger, sp - tagger);
  59                                        date = strtoul(sp, &ep, 10);
  60                                        tz = strtol(ep, NULL, 10);
  61                                        sp = show_date(date, tz, 0);
  62                                        write_or_die(1, sp, strlen(sp));
  63                                        xwrite(1, "\n", 1);
  64                                        break;
  65                                }
  66                        }
  67                        break;
  68                }
  69                if (cp < endp && *cp == '\n')
  70                        /* end of header */
  71                        break;
  72        }
  73        /* At this point, we have copied out the header up to the end of
  74         * the tagger line and cp points at one past \n.  It could be the
  75         * next header line after the tagger line, or it could be another
  76         * \n that marks the end of the headers.  We need to copy out the
  77         * remainder as is.
  78         */
  79        if (cp < endp)
  80                write_or_die(1, cp, endp - cp);
  81}
  82
  83static int cat_one_file(int opt, const char *exp_type, const char *obj_name)
  84{
  85        unsigned char sha1[20];
  86        enum object_type type;
  87        void *buf;
  88        unsigned long size;
  89
  90        if (get_sha1(obj_name, sha1))
  91                die("Not a valid object name %s", obj_name);
  92
  93        buf = NULL;
  94        switch (opt) {
  95        case 't':
  96                type = sha1_object_info(sha1, NULL);
  97                if (type > 0) {
  98                        printf("%s\n", typename(type));
  99                        return 0;
 100                }
 101                break;
 102
 103        case 's':
 104                type = sha1_object_info(sha1, &size);
 105                if (type > 0) {
 106                        printf("%lu\n", size);
 107                        return 0;
 108                }
 109                break;
 110
 111        case 'e':
 112                return !has_sha1_file(sha1);
 113
 114        case 'p':
 115                type = sha1_object_info(sha1, NULL);
 116                if (type < 0)
 117                        die("Not a valid object name %s", obj_name);
 118
 119                /* custom pretty-print here */
 120                if (type == OBJ_TREE) {
 121                        const char *ls_args[3] = { NULL };
 122                        ls_args[0] =  "ls-tree";
 123                        ls_args[1] =  obj_name;
 124                        return cmd_ls_tree(2, ls_args, NULL);
 125                }
 126
 127                buf = read_sha1_file(sha1, &type, &size);
 128                if (!buf)
 129                        die("Cannot read object %s", obj_name);
 130                if (type == OBJ_TAG) {
 131                        pprint_tag(sha1, buf, size);
 132                        return 0;
 133                }
 134
 135                /* otherwise just spit out the data */
 136                break;
 137        case 0:
 138                buf = read_object_with_reference(sha1, exp_type, &size, NULL);
 139                break;
 140
 141        default:
 142                die("git cat-file: unknown option: %s", exp_type);
 143        }
 144
 145        if (!buf)
 146                die("git cat-file %s: bad file", obj_name);
 147
 148        write_or_die(1, buf, size);
 149        return 0;
 150}
 151
 152static int batch_one_object(const char *obj_name, int print_contents)
 153{
 154        unsigned char sha1[20];
 155        enum object_type type = 0;
 156        unsigned long size;
 157        void *contents = contents;
 158
 159        if (!obj_name)
 160           return 1;
 161
 162        if (get_sha1(obj_name, sha1)) {
 163                printf("%s missing\n", obj_name);
 164                fflush(stdout);
 165                return 0;
 166        }
 167
 168        if (print_contents == BATCH)
 169                contents = read_sha1_file(sha1, &type, &size);
 170        else
 171                type = sha1_object_info(sha1, &size);
 172
 173        if (type <= 0) {
 174                printf("%s missing\n", obj_name);
 175                fflush(stdout);
 176                return 0;
 177        }
 178
 179        printf("%s %s %lu\n", sha1_to_hex(sha1), typename(type), size);
 180        fflush(stdout);
 181
 182        if (print_contents == BATCH) {
 183                write_or_die(1, contents, size);
 184                printf("\n");
 185                fflush(stdout);
 186                free(contents);
 187        }
 188
 189        return 0;
 190}
 191
 192static int batch_objects(int print_contents)
 193{
 194        struct strbuf buf = STRBUF_INIT;
 195
 196        while (strbuf_getline(&buf, stdin, '\n') != EOF) {
 197                int error = batch_one_object(buf.buf, print_contents);
 198                if (error)
 199                        return error;
 200        }
 201
 202        return 0;
 203}
 204
 205static const char * const cat_file_usage[] = {
 206        "git cat-file (-t|-s|-e|-p|<type>) <object>",
 207        "git cat-file (--batch|--batch-check) < <list_of_objects>",
 208        NULL
 209};
 210
 211int cmd_cat_file(int argc, const char **argv, const char *prefix)
 212{
 213        int opt = 0, batch = 0;
 214        const char *exp_type = NULL, *obj_name = NULL;
 215
 216        const struct option options[] = {
 217                OPT_GROUP("<type> can be one of: blob, tree, commit, tag"),
 218                OPT_SET_INT('t', NULL, &opt, "show object type", 't'),
 219                OPT_SET_INT('s', NULL, &opt, "show object size", 's'),
 220                OPT_SET_INT('e', NULL, &opt,
 221                            "exit with zero when there's no error", 'e'),
 222                OPT_SET_INT('p', NULL, &opt, "pretty-print object's content", 'p'),
 223                OPT_SET_INT(0, "batch", &batch,
 224                            "show info and content of objects fed from the standard input",
 225                            BATCH),
 226                OPT_SET_INT(0, "batch-check", &batch,
 227                            "show info about objects fed from the standard input",
 228                            BATCH_CHECK),
 229                OPT_END()
 230        };
 231
 232        git_config(git_default_config, NULL);
 233
 234        if (argc != 3 && argc != 2)
 235                usage_with_options(cat_file_usage, options);
 236
 237        argc = parse_options(argc, argv, prefix, options, cat_file_usage, 0);
 238
 239        if (opt) {
 240                if (argc == 1)
 241                        obj_name = argv[0];
 242                else
 243                        usage_with_options(cat_file_usage, options);
 244        }
 245        if (!opt && !batch) {
 246                if (argc == 2) {
 247                        exp_type = argv[0];
 248                        obj_name = argv[1];
 249                } else
 250                        usage_with_options(cat_file_usage, options);
 251        }
 252        if (batch && (opt || argc)) {
 253                usage_with_options(cat_file_usage, options);
 254        }
 255
 256        if (batch)
 257                return batch_objects(batch);
 258
 259        return cat_one_file(opt, exp_type, obj_name);
 260}