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
  43 #define CHECKOUT_ALL 4
  44 static const char *prefix;
  45 static int prefix_length;
  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][MAXPATHLEN+1];
  50
  51 static struct checkout state = {
  52         .base_dir = "",
  53         .base_dir_len = 0,
  54         .force = 0,
  55         .quiet = 0,
  56         .not_new = 0,
  57         .refresh_cache = 0,
  58 };
  59
  60 static void write_tempfile_record (const char *name)
  61 {
  62         int i;
  63
  64         if (CHECKOUT_ALL == checkout_stage) {
  65                 for (i = 1; i < 4; i++) {
  66                         if (i > 1)
  67                                 putchar(' ');
  68                         if (topath[i][0])
  69                                 fputs(topath[i], stdout);
  70                         else
  71                                 putchar('.');
  72                 }
  73         } else
  74                 fputs(topath[checkout_stage], stdout);
  75
  76         putchar('\t');
  77         write_name_quoted("", 0, name + prefix_length,
  78                 line_termination, stdout);
  79         putchar(line_termination);
  80
  81         for (i = 0; i < 4; i++) {
  82                 topath[i][0] = 0;
  83         }
  84 }
  85
  86 static int checkout_file(const char *name)
  87 {
  88         int namelen = strlen(name);
  89         int pos = cache_name_pos(name, namelen);
  90         int has_same_name = 0;
  91         int did_checkout = 0;
  92         int errs = 0;
  93
  94         if (pos < 0)
  95                 pos = -pos - 1;
  96
  97         while (pos < active_nr) {
  98                 struct cache_entry *ce = active_cache[pos];
  99                 if (ce_namelen(ce) != namelen ||
 100                     memcmp(ce->name, name, namelen))
 101                         break;
 102                 has_same_name = 1;
 103                 pos++;
 104                 if (ce_stage(ce) != checkout_stage
 105                     && (CHECKOUT_ALL != checkout_stage || !ce_stage(ce)))
 106                         continue;
 107                 did_checkout = 1;
 108                 if (checkout_entry(ce, &state,
 109                     to_tempfile ? topath[ce_stage(ce)] : NULL) < 0)
 110                         errs++;
 111         }
 112
 113         if (did_checkout) {
 114                 if (to_tempfile)
 115                         write_tempfile_record(name);
 116                 return errs > 0 ? -1 : 0;
 117         }
 118
 119         if (!state.quiet) {
 120                 fprintf(stderr, "git-checkout-index: %s ", name);
 121                 if (!has_same_name)
 122                         fprintf(stderr, "is not in the cache");
 123                 else if (checkout_stage)
 124                         fprintf(stderr, "does not exist at stage %d",
 125                                 checkout_stage);
 126                 else
 127                         fprintf(stderr, "is unmerged");
 128                 fputc('\n', stderr);
 129         }
 130         return -1;
 131 }
 132
 133 static int checkout_all(void)
 134 {
 135         int i, errs = 0;
 136         struct cache_entry* last_ce = NULL;
 137
 138         for (i = 0; i < active_nr ; i++) {
 139                 struct cache_entry *ce = active_cache[i];
 140                 if (ce_stage(ce) != checkout_stage
 141                     && (CHECKOUT_ALL != checkout_stage || !ce_stage(ce)))
 142                         continue;
 143                 if (prefix && *prefix &&
 144                     (ce_namelen(ce) <= prefix_length ||
 145                      memcmp(prefix, ce->name, prefix_length)))
 146                         continue;
 147                 if (last_ce && to_tempfile) {
 148                         if (ce_namelen(last_ce) != ce_namelen(ce)
 149                             || memcmp(last_ce->name, ce->name, ce_namelen(ce)))
 150                                 write_tempfile_record(last_ce->name);
 151                 }
 152                 if (checkout_entry(ce, &state,
 153                     to_tempfile ? topath[ce_stage(ce)] : NULL) < 0)
 154                         errs++;
 155                 last_ce = ce;
 156         }
 157         if (last_ce && to_tempfile)
 158                 write_tempfile_record(last_ce->name);
 159         if (errs)
 160                 /* we have already done our error reporting.
 161                  * exit with the same code as die().
 162                  */
 163                 exit(128);
 164         return 0;
 165 }
 166
 167 static const char checkout_cache_usage[] =
 168 "git-checkout-index [-u] [-q] [-a] [-f] [-n] [--stage=[123]|all] [--prefix=<string>] [--temp] [--] <file>...";
 169
 170 static struct cache_file cache_file;
 171
 172 int main(int argc, char **argv)
 173 {
 174         int i;
 175         int newfd = -1;
 176         int all = 0;
 177         int read_from_stdin = 0;
 178
 179         prefix = setup_git_directory();
 180         git_config(git_default_config);
 181         prefix_length = prefix ? strlen(prefix) : 0;
 182
 183         if (read_cache() < 0) {
 184                 die("invalid cache");
 185         }
 186
 187         for (i = 1; i < argc; i++) {
 188                 const char *arg = argv[i];
 189
 190                 if (!strcmp(arg, "--")) {
 191                         i++;
 192                         break;
 193                 }
 194                 if (!strcmp(arg, "-a") || !strcmp(arg, "--all")) {
 195                         all = 1;
 196                         continue;
 197                 }
 198                 if (!strcmp(arg, "-f") || !strcmp(arg, "--force")) {
 199                         state.force = 1;
 200                         continue;
 201                 }
 202                 if (!strcmp(arg, "-q") || !strcmp(arg, "--quiet")) {
 203                         state.quiet = 1;
 204                         continue;
 205                 }
 206                 if (!strcmp(arg, "-n") || !strcmp(arg, "--no-create")) {
 207                         state.not_new = 1;
 208                         continue;
 209                 }
 210                 if (!strcmp(arg, "-u") || !strcmp(arg, "--index")) {
 211                         state.refresh_cache = 1;
 212                         if (newfd < 0)
 213                                 newfd = hold_index_file_for_update
 214                                         (&cache_file,
 215                                          get_index_file());
 216                         if (newfd < 0)
 217                                 die("cannot open index.lock file.");
 218                         continue;
 219                 }
 220                 if (!strcmp(arg, "-z")) {
 221                         line_termination = 0;
 222                         continue;
 223                 }
 224                 if (!strcmp(arg, "--stdin")) {
 225                         if (i != argc - 1)
 226                                 die("--stdin must be at the end");
 227                         read_from_stdin = 1;
 228                         i++; /* do not consider arg as a file name */
 229                         break;
 230                 }
 231                 if (!strcmp(arg, "--temp")) {
 232                         to_tempfile = 1;
 233                         continue;
 234                 }
 235                 if (!strncmp(arg, "--prefix=", 9)) {
 236                         state.base_dir = arg+9;
 237                         state.base_dir_len = strlen(state.base_dir);
 238                         continue;
 239                 }
 240                 if (!strncmp(arg, "--stage=", 8)) {
 241                         if (!strcmp(arg + 8, "all")) {
 242                                 to_tempfile = 1;
 243                                 checkout_stage = CHECKOUT_ALL;
 244                         } else {
 245                                 int ch = arg[8];
 246                                 if ('1' <= ch && ch <= '3')
 247                                         checkout_stage = arg[8] - '0';
 248                                 else
 249                                         die("stage should be between 1 and 3 or all");
 250                         }
 251                         continue;
 252                 }
 253                 if (arg[0] == '-')
 254                         usage(checkout_cache_usage);
 255                 break;
 256         }
 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                         close(newfd); newfd = -1;
 264                         rollback_index_file(&cache_file);
 265                 }
 266                 state.refresh_cache = 0;
 267         }
 268
 269         /* Check out named files first */
 270         for ( ; 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);
 280                 if (p < arg || p > arg + strlen(arg))
 281                         free((char*)p);
 282         }
 283
 284         if (read_from_stdin) {
 285                 struct strbuf buf;
 286                 if (all)
 287                         die("git-checkout-index: don't mix '--all' and '--stdin'");
 288                 strbuf_init(&buf);
 289                 while (1) {
 290                         char *path_name;
 291                         const char *p;
 292
 293                         read_line(&buf, stdin, line_termination);
 294                         if (buf.eof)
 295                                 break;
 296                         if (line_termination && buf.buf[0] == '"')
 297                                 path_name = unquote_c_style(buf.buf, NULL);
 298                         else
 299                                 path_name = buf.buf;
 300                         p = prefix_path(prefix, prefix_length, path_name);
 301                         checkout_file(p);
 302                         if (p < path_name || p > path_name + strlen(path_name))
 303                                 free((char *)p);
 304                         if (path_name != buf.buf)
 305                                 free(path_name);
 306                 }
 307         }
 308
 309         if (all)
 310                 checkout_all();
 311
 312         if (0 <= newfd &&
 313             (write_cache(newfd, active_cache, active_nr) ||
 314              commit_index_file(&cache_file)))
 315                 die("Unable to write new cachefile");
 316         return 0;
 317 }