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
  16 static 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
  83 static 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] = {"ls-tree", obj_name, NULL};
 122                         return cmd_ls_tree(2, ls_args, NULL);
 123                 }
 124
 125                 buf = read_sha1_file(sha1, &type, &size);
 126                 if (!buf)
 127                         die("Cannot read object %s", obj_name);
 128                 if (type == OBJ_TAG) {
 129                         pprint_tag(sha1, buf, size);
 130                         return 0;
 131                 }
 132
 133                 /* otherwise just spit out the data */
 134                 break;
 135         case 0:
 136                 buf = read_object_with_reference(sha1, exp_type, &size, NULL);
 137                 break;
 138
 139         default:
 140                 die("git cat-file: unknown option: %s", exp_type);
 141         }
 142
 143         if (!buf)
 144                 die("git cat-file %s: bad file", obj_name);
 145
 146         write_or_die(1, buf, size);
 147         return 0;
 148 }
 149
 150 static int batch_one_object(const char *obj_name, int print_contents)
 151 {
 152         unsigned char sha1[20];
 153         enum object_type type = 0;
 154         unsigned long size;
 155         void *contents = contents;
 156
 157         if (!obj_name)
 158            return 1;
 159
 160         if (get_sha1(obj_name, sha1)) {
 161                 printf("%s missing\n", obj_name);
 162                 fflush(stdout);
 163                 return 0;
 164         }
 165
 166         if (print_contents == BATCH)
 167                 contents = read_sha1_file(sha1, &type, &size);
 168         else
 169                 type = sha1_object_info(sha1, &size);
 170
 171         if (type <= 0) {
 172                 printf("%s missing\n", obj_name);
 173                 fflush(stdout);
 174                 return 0;
 175         }
 176
 177         printf("%s %s %lu\n", sha1_to_hex(sha1), typename(type), size);
 178         fflush(stdout);
 179
 180         if (print_contents == BATCH) {
 181                 write_or_die(1, contents, size);
 182                 printf("\n");
 183                 fflush(stdout);
 184                 free(contents);
 185         }
 186
 187         return 0;
 188 }
 189
 190 static int batch_objects(int print_contents)
 191 {
 192         struct strbuf buf = STRBUF_INIT;
 193
 194         while (strbuf_getline(&buf, stdin, '\n') != EOF) {
 195                 int error = batch_one_object(buf.buf, print_contents);
 196                 if (error)
 197                         return error;
 198         }
 199
 200         return 0;
 201 }
 202
 203 static const char * const cat_file_usage[] = {
 204         "git cat-file (-t|-s|-e|-p|<type>) <object>",
 205         "git cat-file (--batch|--batch-check) < <list_of_objects>",
 206         NULL
 207 };
 208
 209 int cmd_cat_file(int argc, const char **argv, const char *prefix)
 210 {
 211         int opt = 0, batch = 0;
 212         const char *exp_type = NULL, *obj_name = NULL;
 213
 214         const struct option options[] = {
 215                 OPT_GROUP("<type> can be one of: blob, tree, commit, tag"),
 216                 OPT_SET_INT('t', NULL, &opt, "show object type", 't'),
 217                 OPT_SET_INT('s', NULL, &opt, "show object size", 's'),
 218                 OPT_SET_INT('e', NULL, &opt,
 219                             "exit with zero when there's no error", 'e'),
 220                 OPT_SET_INT('p', NULL, &opt, "pretty-print object's content", 'p'),
 221                 OPT_SET_INT(0, "batch", &batch,
 222                             "show info and content of objects fed from the standard input",
 223                             BATCH),
 224                 OPT_SET_INT(0, "batch-check", &batch,
 225                             "show info about objects fed from the standard input",
 226                             BATCH_CHECK),
 227                 OPT_END()
 228         };
 229
 230         git_config(git_default_config, NULL);
 231
 232         if (argc != 3 && argc != 2)
 233                 usage_with_options(cat_file_usage, options);
 234
 235         argc = parse_options(argc, argv, prefix, options, cat_file_usage, 0);
 236
 237         if (opt) {
 238                 if (argc == 1)
 239                         obj_name = argv[0];
 240                 else
 241                         usage_with_options(cat_file_usage, options);
 242         }
 243         if (!opt && !batch) {
 244                 if (argc == 2) {
 245                         exp_type = argv[0];
 246                         obj_name = argv[1];
 247                 } else
 248                         usage_with_options(cat_file_usage, options);
 249         }
 250         if (batch && (opt || argc)) {
 251                 usage_with_options(cat_file_usage, options);
 252         }
 253
 254         if (batch)
 255                 return batch_objects(batch);
 256
 257         return cat_one_file(opt, exp_type, obj_name);
 258 }