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