builtin-checkout-index.c

   1 /*
   2  * Check-out files from the "current cache directory"
   3  *
   4  * Copyright (C) 2005 Linus Torvalds
   5  *
   6  * Careful: order of argument flags does matter. For example,
   7  *
   8  *      git checkout-index -a -f file.c
   9  *
  10  * Will first check out all files listed in the cache (but not
  11  * overwrite any old ones), and then force-checkout "file.c" a
  12  * second time (ie that one _will_ overwrite any old contents
  13  * with the same filename).
  14  *
  15  * Also, just doing "git checkout-index" does nothing. You probably
  16  * meant "git checkout-index -a". And if you want to force it, you
  17  * want "git checkout-index -f -a".
  18  *
  19  * Intuitiveness is not the goal here. Repeatability is. The
  20  * reason for the "no arguments means no work" thing is that
  21  * from scripts you are supposed to be able to do things like
  22  *
  23  *      find . -name '*.h' -print0 | xargs -0 git checkout-index -f --
  24  *
  25  * or:
  26  *
  27  *      find . -name '*.h' -print0 | git checkout-index -f -z --stdin
  28  *
  29  * which will force all existing *.h files to be replaced with
  30  * their cached copies. If an empty command line implied "all",
  31  * then this would force-refresh everything in the cache, which
  32  * was not the point.
  33  *
  34  * Oh, and the "--" is just a good idea when you know the rest
  35  * will be filenames. Just so that you wouldn't have a filename
  36  * of "-a" causing problems (not possible in the above example,
  37  * but get used to it in scripting!).
  38  */
  39 #include "builtin.h"
  40 #include "cache.h"
  41 #include "quote.h"
  42 #include "cache-tree.h"
  43 #include "parse-options.h"
  44
  45 #define CHECKOUT_ALL 4
  46 static int line_termination = '\n';
  47 static int checkout_stage; /* default to checkout stage0 */
  48 static int to_tempfile;
  49 static char topath[4][PATH_MAX + 1];
  50
  51 static struct checkout state;
  52
  53 static void write_tempfile_record(const char *name, int prefix_length)
  54 {
  55         int i;
  56
  57         if (CHECKOUT_ALL == checkout_stage) {
  58                 for (i = 1; i < 4; i++) {
  59                         if (i > 1)
  60                                 putchar(' ');
  61                         if (topath[i][0])
  62                                 fputs(topath[i], stdout);
  63                         else
  64                                 putchar('.');
  65                 }
  66         } else
  67                 fputs(topath[checkout_stage], stdout);
  68
  69         putchar('\t');
  70         write_name_quoted(name + prefix_length, stdout, line_termination);
  71
  72         for (i = 0; i < 4; i++) {
  73                 topath[i][0] = 0;
  74         }
  75 }
  76
  77 static int checkout_file(const char *name, int prefix_length)
  78 {
  79         int namelen = strlen(name);
  80         int pos = cache_name_pos(name, namelen);
  81         int has_same_name = 0;
  82         int did_checkout = 0;
  83         int errs = 0;
  84
  85         if (pos < 0)
  86                 pos = -pos - 1;
  87
  88         while (pos < active_nr) {
  89                 struct cache_entry *ce = active_cache[pos];
  90                 if (ce_namelen(ce) != namelen ||
  91                     memcmp(ce->name, name, namelen))
  92                         break;
  93                 has_same_name = 1;
  94                 pos++;
  95                 if (ce_stage(ce) != checkout_stage
  96                     && (CHECKOUT_ALL != checkout_stage || !ce_stage(ce)))
  97                         continue;
  98                 did_checkout = 1;
  99                 if (checkout_entry(ce, &state,
 100                     to_tempfile ? topath[ce_stage(ce)] : NULL) < 0)
 101                         errs++;
 102         }
 103
 104         if (did_checkout) {
 105                 if (to_tempfile)
 106                         write_tempfile_record(name, prefix_length);
 107                 return errs > 0 ? -1 : 0;
 108         }
 109
 110         if (!state.quiet) {
 111                 fprintf(stderr, "git checkout-index: %s ", name);
 112                 if (!has_same_name)
 113                         fprintf(stderr, "is not in the cache");
 114                 else if (checkout_stage)
 115                         fprintf(stderr, "does not exist at stage %d",
 116                                 checkout_stage);
 117                 else
 118                         fprintf(stderr, "is unmerged");
 119                 fputc('\n', stderr);
 120         }
 121         return -1;
 122 }
 123
 124 static void checkout_all(const char *prefix, int prefix_length)
 125 {
 126         int i, errs = 0;
 127         struct cache_entry *last_ce = NULL;
 128
 129         for (i = 0; i < active_nr ; i++) {
 130                 struct cache_entry *ce = active_cache[i];
 131                 if (ce_stage(ce) != checkout_stage
 132                     && (CHECKOUT_ALL != checkout_stage || !ce_stage(ce)))
 133                         continue;
 134                 if (prefix && *prefix &&
 135                     (ce_namelen(ce) <= prefix_length ||
 136                      memcmp(prefix, ce->name, prefix_length)))
 137                         continue;
 138                 if (last_ce && to_tempfile) {
 139                         if (ce_namelen(last_ce) != ce_namelen(ce)
 140                             || memcmp(last_ce->name, ce->name, ce_namelen(ce)))
 141                                 write_tempfile_record(last_ce->name, prefix_length);
 142                 }
 143                 if (checkout_entry(ce, &state,
 144                     to_tempfile ? topath[ce_stage(ce)] : NULL) < 0)
 145                         errs++;
 146                 last_ce = ce;
 147         }
 148         if (last_ce && to_tempfile)
 149                 write_tempfile_record(last_ce->name, prefix_length);
 150         if (errs)
 151                 /* we have already done our error reporting.
 152                  * exit with the same code as die().
 153                  */
 154                 exit(128);
 155 }
 156
 157 static const char * const builtin_checkout_index_usage[] = {
 158         "git checkout-index [options] [--] <file>...",
 159         NULL
 160 };
 161
 162 static struct lock_file lock_file;
 163
 164 static int option_parse_u(const struct option *opt,
 165                               const char *arg, int unset)
 166 {
 167         int *newfd = opt->value;
 168
 169         state.refresh_cache = 1;
 170         if (*newfd < 0)
 171                 *newfd = hold_locked_index(&lock_file, 1);
 172         return 0;
 173 }
 174
 175 static int option_parse_z(const struct option *opt,
 176                           const char *arg, int unset)
 177 {
 178         if (unset)
 179                 line_termination = '\n';
 180         else
 181                 line_termination = 0;
 182         return 0;
 183 }
 184
 185 static int option_parse_prefix(const struct option *opt,
 186                                const char *arg, int unset)
 187 {
 188         state.base_dir = arg;
 189         state.base_dir_len = strlen(arg);
 190         return 0;
 191 }
 192
 193 static int option_parse_stage(const struct option *opt,
 194                               const char *arg, int unset)
 195 {
 196         if (!strcmp(arg, "all")) {
 197                 to_tempfile = 1;
 198                 checkout_stage = CHECKOUT_ALL;
 199         } else {
 200                 int ch = arg[0];
 201                 if ('1' <= ch && ch <= '3')
 202                         checkout_stage = arg[0] - '0';
 203                 else
 204                         die("stage should be between 1 and 3 or all");
 205         }
 206         return 0;
 207 }
 208
 209 int cmd_checkout_index(int argc, const char **argv, const char *prefix)
 210 {
 211         int i;
 212         int newfd = -1;
 213         int all = 0;
 214         int read_from_stdin = 0;
 215         int prefix_length;
 216         int force = 0, quiet = 0, not_new = 0;
 217         struct option builtin_checkout_index_options[] = {
 218                 OPT_BOOLEAN('a', "all", &all,
 219                         "checks out all files in the index"),
 220                 OPT_BOOLEAN('f', "force", &force,
 221                         "forces overwrite of existing files"),
 222                 OPT__QUIET(&quiet),
 223                 OPT_BOOLEAN('n', "no-create", &not_new,
 224                         "don't checkout new files"),
 225                 { OPTION_CALLBACK, 'u', "index", &newfd, NULL,
 226                         "update stat information in the index file",
 227                         PARSE_OPT_NOARG, option_parse_u },
 228                 { OPTION_CALLBACK, 'z', NULL, NULL, NULL,
 229                         "paths are separated with NUL character",
 230                         PARSE_OPT_NOARG, option_parse_z },
 231                 OPT_BOOLEAN(0, "stdin", &read_from_stdin,
 232                         "read list of paths from the standard input"),
 233                 OPT_BOOLEAN(0, "temp", &to_tempfile,
 234                         "write the content to temporary files"),
 235                 OPT_CALLBACK(0, "prefix", NULL, "string",
 236                         "when creating files, prepend <string>",
 237                         option_parse_prefix),
 238                 OPT_CALLBACK(0, "stage", NULL, NULL,
 239                         "copy out the files from named stage",
 240                         option_parse_stage),
 241                 OPT_END()
 242         };
 243
 244         git_config(git_default_config, NULL);
 245         state.base_dir = "";
 246         prefix_length = prefix ? strlen(prefix) : 0;
 247
 248         if (read_cache() < 0) {
 249                 die("invalid cache");
 250         }
 251
 252         argc = parse_options(argc, argv, prefix, builtin_checkout_index_options,
 253                         builtin_checkout_index_usage, 0);
 254         state.force = force;
 255         state.quiet = quiet;
 256         state.not_new = not_new;
 257
 258         if (state.base_dir_len || to_tempfile) {
 259                 /* when --prefix is specified we do not
 260                  * want to update cache.
 261                  */
 262                 if (state.refresh_cache) {
 263                         rollback_lock_file(&lock_file);
 264                         newfd = -1;
 265                 }
 266                 state.refresh_cache = 0;
 267         }
 268
 269         /* Check out named files first */
 270         for (i = 0; i < argc; i++) {
 271                 const char *arg = argv[i];
 272                 const char *p;
 273
 274                 if (all)
 275                         die("git checkout-index: don't mix '--all' and explicit filenames");
 276                 if (read_from_stdin)
 277                         die("git checkout-index: don't mix '--stdin' and explicit filenames");
 278                 p = prefix_path(prefix, prefix_length, arg);
 279                 checkout_file(p, prefix_length);
 280                 if (p < arg || p > arg + strlen(arg))
 281                         free((char *)p);
 282         }
 283
 284         if (read_from_stdin) {
 285                 struct strbuf buf = STRBUF_INIT, nbuf = STRBUF_INIT;
 286
 287                 if (all)
 288                         die("git checkout-index: don't mix '--all' and '--stdin'");
 289
 290                 while (strbuf_getline(&buf, stdin, line_termination) != EOF) {
 291                         const char *p;
 292                         if (line_termination && buf.buf[0] == '"') {
 293                                 strbuf_reset(&nbuf);
 294                                 if (unquote_c_style(&nbuf, buf.buf, NULL))
 295                                         die("line is badly quoted");
 296                                 strbuf_swap(&buf, &nbuf);
 297                         }
 298                         p = prefix_path(prefix, prefix_length, buf.buf);
 299                         checkout_file(p, prefix_length);
 300                         if (p < buf.buf || p > buf.buf + buf.len)
 301                                 free((char *)p);
 302                 }
 303                 strbuf_release(&nbuf);
 304                 strbuf_release(&buf);
 305         }
 306
 307         if (all)
 308                 checkout_all(prefix, prefix_length);
 309
 310         if (0 <= newfd &&
 311             (write_cache(newfd, active_cache, active_nr) ||
 312              commit_locked_index(&lock_file)))
 313                 die("Unable to write new index file");
 314         return 0;
 315 }