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