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 static const char *prefix;
  44 static int prefix_length;
  45 static int checkout_stage; /* default to checkout stage0 */
  46
  47 static struct checkout state = {
  48         .base_dir = "",
  49         .base_dir_len = 0,
  50         .force = 0,
  51         .quiet = 0,
  52         .not_new = 0,
  53         .refresh_cache = 0,
  54 };
  55
  56 static int checkout_file(const char *name)
  57 {
  58         int namelen = strlen(name);
  59         int pos = cache_name_pos(name, namelen);
  60         int has_same_name = 0;
  61
  62         if (pos < 0)
  63                 pos = -pos - 1;
  64
  65         while (pos < active_nr) {
  66                 struct cache_entry *ce = active_cache[pos];
  67                 if (ce_namelen(ce) != namelen ||
  68                     memcmp(ce->name, name, namelen))
  69                         break;
  70                 has_same_name = 1;
  71                 if (checkout_stage == ce_stage(ce))
  72                         return checkout_entry(ce, &state);
  73                 pos++;
  74         }
  75
  76         if (!state.quiet) {
  77                 fprintf(stderr, "git-checkout-index: %s ", name);
  78                 if (!has_same_name)
  79                         fprintf(stderr, "is not in the cache");
  80                 else if (checkout_stage)
  81                         fprintf(stderr, "does not exist at stage %d",
  82                                 checkout_stage);
  83                 else
  84                         fprintf(stderr, "is unmerged");
  85                 fputc('\n', stderr);
  86         }
  87         return -1;
  88 }
  89
  90 static int checkout_all(void)
  91 {
  92         int i, errs = 0;
  93
  94         for (i = 0; i < active_nr ; i++) {
  95                 struct cache_entry *ce = active_cache[i];
  96                 if (ce_stage(ce) != checkout_stage)
  97                         continue;
  98                 if (prefix && *prefix &&
  99                     (ce_namelen(ce) <= prefix_length ||
 100                      memcmp(prefix, ce->name, prefix_length)))
 101                         continue;
 102                 if (checkout_entry(ce, &state) < 0)
 103                         errs++;
 104         }
 105         if (errs)
 106                 /* we have already done our error reporting.
 107                  * exit with the same code as die().
 108                  */
 109                 exit(128);
 110         return 0;
 111 }
 112
 113 static const char checkout_cache_usage[] =
 114 "git-checkout-index [-u] [-q] [-a] [-f] [-n] [--stage=[123]] [--prefix=<string>] [--] <file>...";
 115
 116 static struct cache_file cache_file;
 117
 118 int main(int argc, char **argv)
 119 {
 120         int i;
 121         int newfd = -1;
 122         int all = 0;
 123         int read_from_stdin = 0;
 124         int line_termination = '\n';
 125
 126         prefix = setup_git_directory();
 127         git_config(git_default_config);
 128         prefix_length = prefix ? strlen(prefix) : 0;
 129
 130         if (read_cache() < 0) {
 131                 die("invalid cache");
 132         }
 133
 134         for (i = 1; i < argc; i++) {
 135                 const char *arg = argv[i];
 136
 137                 if (!strcmp(arg, "--")) {
 138                         i++;
 139                         break;
 140                 }
 141                 if (!strcmp(arg, "-a") || !strcmp(arg, "--all")) {
 142                         all = 1;
 143                         continue;
 144                 }
 145                 if (!strcmp(arg, "-f") || !strcmp(arg, "--force")) {
 146                         state.force = 1;
 147                         continue;
 148                 }
 149                 if (!strcmp(arg, "-q") || !strcmp(arg, "--quiet")) {
 150                         state.quiet = 1;
 151                         continue;
 152                 }
 153                 if (!strcmp(arg, "-n") || !strcmp(arg, "--no-create")) {
 154                         state.not_new = 1;
 155                         continue;
 156                 }
 157                 if (!strcmp(arg, "-u") || !strcmp(arg, "--index")) {
 158                         state.refresh_cache = 1;
 159                         if (newfd < 0)
 160                                 newfd = hold_index_file_for_update
 161                                         (&cache_file,
 162                                          get_index_file());
 163                         if (newfd < 0)
 164                                 die("cannot open index.lock file.");
 165                         continue;
 166                 }
 167                 if (!strcmp(arg, "-z")) {
 168                         line_termination = 0;
 169                         continue;
 170                 }
 171                 if (!strcmp(arg, "--stdin")) {
 172                         if (i != argc - 1)
 173                                 die("--stdin must be at the end");
 174                         read_from_stdin = 1;
 175                         i++; /* do not consider arg as a file name */
 176                         break;
 177                 }
 178                 if (!strncmp(arg, "--prefix=", 9)) {
 179                         state.base_dir = arg+9;
 180                         state.base_dir_len = strlen(state.base_dir);
 181                         continue;
 182                 }
 183                 if (!strncmp(arg, "--stage=", 8)) {
 184                         int ch = arg[8];
 185                         if ('1' <= ch && ch <= '3')
 186                                 checkout_stage = arg[8] - '0';
 187                         else
 188                                 die("stage should be between 1 and 3");
 189                         continue;
 190                 }
 191                 if (arg[0] == '-')
 192                         usage(checkout_cache_usage);
 193                 break;
 194         }
 195
 196         if (state.base_dir_len) {
 197                 /* when --prefix is specified we do not
 198                  * want to update cache.
 199                  */
 200                 if (state.refresh_cache) {
 201                         close(newfd); newfd = -1;
 202                         rollback_index_file(&cache_file);
 203                 }
 204                 state.refresh_cache = 0;
 205         }
 206
 207         /* Check out named files first */
 208         for ( ; i < argc; i++) {
 209                 const char *arg = argv[i];
 210
 211                 if (all)
 212                         die("git-checkout-index: don't mix '--all' and explicit filenames");
 213                 if (read_from_stdin)
 214                         die("git-checkout-index: don't mix '--stdin' and explicit filenames");
 215                 checkout_file(prefix_path(prefix, prefix_length, arg));
 216         }
 217
 218         if (read_from_stdin) {
 219                 struct strbuf buf;
 220                 if (all)
 221                         die("git-checkout-index: don't mix '--all' and '--stdin'");
 222                 strbuf_init(&buf);
 223                 while (1) {
 224                         char *path_name;
 225                         read_line(&buf, stdin, line_termination);
 226                         if (buf.eof)
 227                                 break;
 228                         if (line_termination && buf.buf[0] == '"')
 229                                 path_name = unquote_c_style(buf.buf, NULL);
 230                         else
 231                                 path_name = buf.buf;
 232                         checkout_file(prefix_path(prefix, prefix_length, path_name));
 233                         if (path_name != buf.buf)
 234                                 free(path_name);
 235                 }
 236         }
 237
 238         if (all)
 239                 checkout_all();
 240
 241         if (0 <= newfd &&
 242             (write_cache(newfd, active_cache, active_nr) ||
 243              commit_index_file(&cache_file)))
 244                 die("Unable to write new cachefile");
 245         return 0;
 246 }