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 "cache.h"
  40 #include "strbuf.h"
  41 #include "quote.h"
  42 #include "cache-tree.h"
  43
  44 #define CHECKOUT_ALL 4
  45 static const char *prefix;
  46 static int prefix_length;
  47 static int line_termination = '\n';
  48 static int checkout_stage; /* default to checkout stage0 */
  49 static int to_tempfile;
  50 static char topath[4][MAXPATHLEN+1];
  51
  52 static struct checkout state;
  53
  54 static void write_tempfile_record (const char *name)
  55 {
  56         int i;
  57
  58         if (CHECKOUT_ALL == checkout_stage) {
  59                 for (i = 1; i < 4; i++) {
  60                         if (i > 1)
  61                                 putchar(' ');
  62                         if (topath[i][0])
  63                                 fputs(topath[i], stdout);
  64                         else
  65                                 putchar('.');
  66                 }
  67         } else
  68                 fputs(topath[checkout_stage], stdout);
  69
  70         putchar('\t');
  71         write_name_quoted("", 0, name + prefix_length,
  72                 line_termination, stdout);
  73         putchar(line_termination);
  74
  75         for (i = 0; i < 4; i++) {
  76                 topath[i][0] = 0;
  77         }
  78 }
  79
  80 static int checkout_file(const char *name)
  81 {
  82         int namelen = strlen(name);
  83         int pos = cache_name_pos(name, namelen);
  84         int has_same_name = 0;
  85         int did_checkout = 0;
  86         int errs = 0;
  87
  88         if (pos < 0)
  89                 pos = -pos - 1;
  90
  91         while (pos < active_nr) {
  92                 struct cache_entry *ce = active_cache[pos];
  93                 if (ce_namelen(ce) != namelen ||
  94                     memcmp(ce->name, name, namelen))
  95                         break;
  96                 has_same_name = 1;
  97                 pos++;
  98                 if (ce_stage(ce) != checkout_stage
  99                     && (CHECKOUT_ALL != checkout_stage || !ce_stage(ce)))
 100                         continue;
 101                 did_checkout = 1;
 102                 if (checkout_entry(ce, &state,
 103                     to_tempfile ? topath[ce_stage(ce)] : NULL) < 0)
 104                         errs++;
 105         }
 106
 107         if (did_checkout) {
 108                 if (to_tempfile)
 109                         write_tempfile_record(name);
 110                 return errs > 0 ? -1 : 0;
 111         }
 112
 113         if (!state.quiet) {
 114                 fprintf(stderr, "git-checkout-index: %s ", name);
 115                 if (!has_same_name)
 116                         fprintf(stderr, "is not in the cache");
 117                 else if (checkout_stage)
 118                         fprintf(stderr, "does not exist at stage %d",
 119                                 checkout_stage);
 120                 else
 121                         fprintf(stderr, "is unmerged");
 122                 fputc('\n', stderr);
 123         }
 124         return -1;
 125 }
 126
 127 static int checkout_all(void)
 128 {
 129         int i, errs = 0;
 130         struct cache_entry* last_ce = NULL;
 131
 132         for (i = 0; i < active_nr ; i++) {
 133                 struct cache_entry *ce = active_cache[i];
 134                 if (ce_stage(ce) != checkout_stage
 135                     && (CHECKOUT_ALL != checkout_stage || !ce_stage(ce)))
 136                         continue;
 137                 if (prefix && *prefix &&
 138                     (ce_namelen(ce) <= prefix_length ||
 139                      memcmp(prefix, ce->name, prefix_length)))
 140                         continue;
 141                 if (last_ce && to_tempfile) {
 142                         if (ce_namelen(last_ce) != ce_namelen(ce)
 143                             || memcmp(last_ce->name, ce->name, ce_namelen(ce)))
 144                                 write_tempfile_record(last_ce->name);
 145                 }
 146                 if (checkout_entry(ce, &state,
 147                     to_tempfile ? topath[ce_stage(ce)] : NULL) < 0)
 148                         errs++;
 149                 last_ce = ce;
 150         }
 151         if (last_ce && to_tempfile)
 152                 write_tempfile_record(last_ce->name);
 153         if (errs)
 154                 /* we have already done our error reporting.
 155                  * exit with the same code as die().
 156                  */
 157                 exit(128);
 158         return 0;
 159 }
 160
 161 static const char checkout_cache_usage[] =
 162 "git-checkout-index [-u] [-q] [-a] [-f] [-n] [--stage=[123]|all] [--prefix=<string>] [--temp] [--] <file>...";
 163
 164 static struct lock_file lock_file;
 165
 166 int main(int argc, char **argv)
 167 {
 168         int i;
 169         int newfd = -1;
 170         int all = 0;
 171         int read_from_stdin = 0;
 172
 173         state.base_dir = "";
 174         prefix = setup_git_directory();
 175         git_config(git_default_config);
 176         prefix_length = prefix ? strlen(prefix) : 0;
 177
 178         if (read_cache() < 0) {
 179                 die("invalid cache");
 180         }
 181
 182         for (i = 1; i < argc; i++) {
 183                 const char *arg = argv[i];
 184
 185                 if (!strcmp(arg, "--")) {
 186                         i++;
 187                         break;
 188                 }
 189                 if (!strcmp(arg, "-a") || !strcmp(arg, "--all")) {
 190                         all = 1;
 191                         continue;
 192                 }
 193                 if (!strcmp(arg, "-f") || !strcmp(arg, "--force")) {
 194                         state.force = 1;
 195                         continue;
 196                 }
 197                 if (!strcmp(arg, "-q") || !strcmp(arg, "--quiet")) {
 198                         state.quiet = 1;
 199                         continue;
 200                 }
 201                 if (!strcmp(arg, "-n") || !strcmp(arg, "--no-create")) {
 202                         state.not_new = 1;
 203                         continue;
 204                 }
 205                 if (!strcmp(arg, "-u") || !strcmp(arg, "--index")) {
 206                         state.refresh_cache = 1;
 207                         if (newfd < 0)
 208                                 newfd = hold_lock_file_for_update
 209                                         (&lock_file, get_index_file(), 1);
 210                         if (newfd < 0)
 211                                 die("cannot open index.lock file.");
 212                         continue;
 213                 }
 214                 if (!strcmp(arg, "-z")) {
 215                         line_termination = 0;
 216                         continue;
 217                 }
 218                 if (!strcmp(arg, "--stdin")) {
 219                         if (i != argc - 1)
 220                                 die("--stdin must be at the end");
 221                         read_from_stdin = 1;
 222                         i++; /* do not consider arg as a file name */
 223                         break;
 224                 }
 225                 if (!strcmp(arg, "--temp")) {
 226                         to_tempfile = 1;
 227                         continue;
 228                 }
 229                 if (!strncmp(arg, "--prefix=", 9)) {
 230                         state.base_dir = arg+9;
 231                         state.base_dir_len = strlen(state.base_dir);
 232                         continue;
 233                 }
 234                 if (!strncmp(arg, "--stage=", 8)) {
 235                         if (!strcmp(arg + 8, "all")) {
 236                                 to_tempfile = 1;
 237                                 checkout_stage = CHECKOUT_ALL;
 238                         } else {
 239                                 int ch = arg[8];
 240                                 if ('1' <= ch && ch <= '3')
 241                                         checkout_stage = arg[8] - '0';
 242                                 else
 243                                         die("stage should be between 1 and 3 or all");
 244                         }
 245                         continue;
 246                 }
 247                 if (arg[0] == '-')
 248                         usage(checkout_cache_usage);
 249                 break;
 250         }
 251
 252         if (state.base_dir_len || to_tempfile) {
 253                 /* when --prefix is specified we do not
 254                  * want to update cache.
 255                  */
 256                 if (state.refresh_cache) {
 257                         close(newfd); newfd = -1;
 258                         rollback_lock_file(&lock_file);
 259                 }
 260                 state.refresh_cache = 0;
 261         }
 262
 263         /* Check out named files first */
 264         for ( ; i < argc; i++) {
 265                 const char *arg = argv[i];
 266                 const char *p;
 267
 268                 if (all)
 269                         die("git-checkout-index: don't mix '--all' and explicit filenames");
 270                 if (read_from_stdin)
 271                         die("git-checkout-index: don't mix '--stdin' and explicit filenames");
 272                 p = prefix_path(prefix, prefix_length, arg);
 273                 checkout_file(p);
 274                 if (p < arg || p > arg + strlen(arg))
 275                         free((char*)p);
 276         }
 277
 278         if (read_from_stdin) {
 279                 struct strbuf buf;
 280                 if (all)
 281                         die("git-checkout-index: don't mix '--all' and '--stdin'");
 282                 strbuf_init(&buf);
 283                 while (1) {
 284                         char *path_name;
 285                         const char *p;
 286
 287                         read_line(&buf, stdin, line_termination);
 288                         if (buf.eof)
 289                                 break;
 290                         if (line_termination && buf.buf[0] == '"')
 291                                 path_name = unquote_c_style(buf.buf, NULL);
 292                         else
 293                                 path_name = buf.buf;
 294                         p = prefix_path(prefix, prefix_length, path_name);
 295                         checkout_file(p);
 296                         if (p < path_name || p > path_name + strlen(path_name))
 297                                 free((char *)p);
 298                         if (path_name != buf.buf)
 299                                 free(path_name);
 300                 }
 301         }
 302
 303         if (all)
 304                 checkout_all();
 305
 306         if (0 <= newfd &&
 307             (write_cache(newfd, active_cache, active_nr) ||
 308              close(newfd) || commit_lock_file(&lock_file)))
 309                 die("Unable to write new index file");
 310         return 0;
 311 }