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#include "diff.h"
  13#include "userdiff.h"
  14#include "streaming.h"
  15
  16#define BATCH 1
  17#define BATCH_CHECK 2
  18
  19static void pprint_tag(const unsigned char *sha1, const char *buf, unsigned long size)
  20{
  21        /* the parser in tag.c is useless here. */
  22        const char *endp = buf + size;
  23        const char *cp = buf;
  24
  25        while (cp < endp) {
  26                char c = *cp++;
  27                if (c != '\n')
  28                        continue;
  29                if (7 <= endp - cp && !memcmp("tagger ", cp, 7)) {
  30                        const char *tagger = cp;
  31
  32                        /* Found the tagger line.  Copy out the contents
  33                         * of the buffer so far.
  34                         */
  35                        write_or_die(1, buf, cp - buf);
  36
  37                        /*
  38                         * Do something intelligent, like pretty-printing
  39                         * the date.
  40                         */
  41                        while (cp < endp) {
  42                                if (*cp++ == '\n') {
  43                                        /* tagger to cp is a line
  44                                         * that has ident and time.
  45                                         */
  46                                        const char *sp = tagger;
  47                                        char *ep;
  48                                        unsigned long date;
  49                                        long tz;
  50                                        while (sp < cp && *sp != '>')
  51                                                sp++;
  52                                        if (sp == cp) {
  53                                                /* give up */
  54                                                write_or_die(1, tagger,
  55                                                             cp - tagger);
  56                                                break;
  57                                        }
  58                                        while (sp < cp &&
  59                                               !('0' <= *sp && *sp <= '9'))
  60                                                sp++;
  61                                        write_or_die(1, tagger, sp - tagger);
  62                                        date = strtoul(sp, &ep, 10);
  63                                        tz = strtol(ep, NULL, 10);
  64                                        sp = show_date(date, tz, 0);
  65                                        write_or_die(1, sp, strlen(sp));
  66                                        xwrite(1, "\n", 1);
  67                                        break;
  68                                }
  69                        }
  70                        break;
  71                }
  72                if (cp < endp && *cp == '\n')
  73                        /* end of header */
  74                        break;
  75        }
  76        /* At this point, we have copied out the header up to the end of
  77         * the tagger line and cp points at one past \n.  It could be the
  78         * next header line after the tagger line, or it could be another
  79         * \n that marks the end of the headers.  We need to copy out the
  80         * remainder as is.
  81         */
  82        if (cp < endp)
  83                write_or_die(1, cp, endp - cp);
  84}
  85
  86static int cat_one_file(int opt, const char *exp_type, const char *obj_name)
  87{
  88        unsigned char sha1[20];
  89        enum object_type type;
  90        char *buf;
  91        unsigned long size;
  92        struct object_context obj_context;
  93
  94        if (get_sha1_with_context(obj_name, 0, sha1, &obj_context))
  95                die("Not a valid object name %s", obj_name);
  96
  97        buf = NULL;
  98        switch (opt) {
  99        case 't':
 100                type = sha1_object_info(sha1, NULL);
 101                if (type > 0) {
 102                        printf("%s\n", typename(type));
 103                        return 0;
 104                }
 105                break;
 106
 107        case 's':
 108                type = sha1_object_info(sha1, &size);
 109                if (type > 0) {
 110                        printf("%lu\n", size);
 111                        return 0;
 112                }
 113                break;
 114
 115        case 'e':
 116                return !has_sha1_file(sha1);
 117
 118        case 'c':
 119                if (!obj_context.path[0])
 120                        die("git cat-file --textconv %s: <object> must be <sha1:path>",
 121                            obj_name);
 122
 123                if (textconv_object(obj_context.path, obj_context.mode, sha1, 1, &buf, &size))
 124                        break;
 125
 126        case 'p':
 127                type = sha1_object_info(sha1, NULL);
 128                if (type < 0)
 129                        die("Not a valid object name %s", obj_name);
 130
 131                /* custom pretty-print here */
 132                if (type == OBJ_TREE) {
 133                        const char *ls_args[3] = { NULL };
 134                        ls_args[0] =  "ls-tree";
 135                        ls_args[1] =  obj_name;
 136                        return cmd_ls_tree(2, ls_args, NULL);
 137                }
 138
 139                if (type == OBJ_BLOB)
 140                        return stream_blob_to_fd(1, sha1, NULL, 0);
 141                buf = read_sha1_file(sha1, &type, &size);
 142                if (!buf)
 143                        die("Cannot read object %s", obj_name);
 144                if (type == OBJ_TAG) {
 145                        pprint_tag(sha1, buf, size);
 146                        return 0;
 147                }
 148
 149                /* otherwise just spit out the data */
 150                break;
 151
 152        case 0:
 153                if (type_from_string(exp_type) == OBJ_BLOB) {
 154                        unsigned char blob_sha1[20];
 155                        if (sha1_object_info(sha1, NULL) == OBJ_TAG) {
 156                                enum object_type type;
 157                                unsigned long size;
 158                                char *buffer = read_sha1_file(sha1, &type, &size);
 159                                if (memcmp(buffer, "object ", 7) ||
 160                                    get_sha1_hex(buffer + 7, blob_sha1))
 161                                        die("%s not a valid tag", sha1_to_hex(sha1));
 162                                free(buffer);
 163                        } else
 164                                hashcpy(blob_sha1, sha1);
 165
 166                        if (sha1_object_info(blob_sha1, NULL) == OBJ_BLOB)
 167                                return stream_blob_to_fd(1, blob_sha1, NULL, 0);
 168                        /*
 169                         * we attempted to dereference a tag to a blob
 170                         * and failed; there may be new dereference
 171                         * mechanisms this code is not aware of.
 172                         * fall-back to the usual case.
 173                         */
 174                }
 175                buf = read_object_with_reference(sha1, exp_type, &size, NULL);
 176                break;
 177
 178        default:
 179                die("git cat-file: unknown option: %s", exp_type);
 180        }
 181
 182        if (!buf)
 183                die("git cat-file %s: bad file", obj_name);
 184
 185        write_or_die(1, buf, size);
 186        return 0;
 187}
 188
 189static int batch_one_object(const char *obj_name, int print_contents)
 190{
 191        unsigned char sha1[20];
 192        enum object_type type = 0;
 193        unsigned long size;
 194        void *contents = NULL;
 195
 196        if (!obj_name)
 197           return 1;
 198
 199        if (get_sha1(obj_name, sha1)) {
 200                printf("%s missing\n", obj_name);
 201                fflush(stdout);
 202                return 0;
 203        }
 204
 205        if (print_contents == BATCH)
 206                contents = read_sha1_file(sha1, &type, &size);
 207        else
 208                type = sha1_object_info(sha1, &size);
 209
 210        if (type <= 0) {
 211                printf("%s missing\n", obj_name);
 212                fflush(stdout);
 213                if (print_contents == BATCH)
 214                        free(contents);
 215                return 0;
 216        }
 217
 218        printf("%s %s %lu\n", sha1_to_hex(sha1), typename(type), size);
 219        fflush(stdout);
 220
 221        if (print_contents == BATCH) {
 222                write_or_die(1, contents, size);
 223                printf("\n");
 224                fflush(stdout);
 225                free(contents);
 226        }
 227
 228        return 0;
 229}
 230
 231static int batch_objects(int print_contents)
 232{
 233        struct strbuf buf = STRBUF_INIT;
 234
 235        while (strbuf_getline(&buf, stdin, '\n') != EOF) {
 236                int error = batch_one_object(buf.buf, print_contents);
 237                if (error)
 238                        return error;
 239        }
 240
 241        return 0;
 242}
 243
 244static const char * const cat_file_usage[] = {
 245        N_("git cat-file (-t|-s|-e|-p|<type>|--textconv) <object>"),
 246        N_("git cat-file (--batch|--batch-check) < <list_of_objects>"),
 247        NULL
 248};
 249
 250static int git_cat_file_config(const char *var, const char *value, void *cb)
 251{
 252        if (userdiff_config(var, value) < 0)
 253                return -1;
 254
 255        return git_default_config(var, value, cb);
 256}
 257
 258int cmd_cat_file(int argc, const char **argv, const char *prefix)
 259{
 260        int opt = 0, batch = 0;
 261        const char *exp_type = NULL, *obj_name = NULL;
 262
 263        const struct option options[] = {
 264                OPT_GROUP(N_("<type> can be one of: blob, tree, commit, tag")),
 265                OPT_SET_INT('t', NULL, &opt, N_("show object type"), 't'),
 266                OPT_SET_INT('s', NULL, &opt, N_("show object size"), 's'),
 267                OPT_SET_INT('e', NULL, &opt,
 268                            N_("exit with zero when there's no error"), 'e'),
 269                OPT_SET_INT('p', NULL, &opt, N_("pretty-print object's content"), 'p'),
 270                OPT_SET_INT(0, "textconv", &opt,
 271                            N_("for blob objects, run textconv on object's content"), 'c'),
 272                OPT_SET_INT(0, "batch", &batch,
 273                            N_("show info and content of objects fed from the standard input"),
 274                            BATCH),
 275                OPT_SET_INT(0, "batch-check", &batch,
 276                            N_("show info about objects fed from the standard input"),
 277                            BATCH_CHECK),
 278                OPT_END()
 279        };
 280
 281        git_config(git_cat_file_config, NULL);
 282
 283        if (argc != 3 && argc != 2)
 284                usage_with_options(cat_file_usage, options);
 285
 286        argc = parse_options(argc, argv, prefix, options, cat_file_usage, 0);
 287
 288        if (opt) {
 289                if (argc == 1)
 290                        obj_name = argv[0];
 291                else
 292                        usage_with_options(cat_file_usage, options);
 293        }
 294        if (!opt && !batch) {
 295                if (argc == 2) {
 296                        exp_type = argv[0];
 297                        obj_name = argv[1];
 298                } else
 299                        usage_with_options(cat_file_usage, options);
 300        }
 301        if (batch && (opt || argc)) {
 302                usage_with_options(cat_file_usage, options);
 303        }
 304
 305        if (batch)
 306                return batch_objects(batch);
 307
 308        return cat_one_file(opt, exp_type, obj_name);
 309}