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  * which will force all existing *.h files to be replaced with
  26  * their cached copies. If an empty command line implied "all",
  27  * then this would force-refresh everything in the cache, which
  28  * was not the point.
  29  *
  30  * Oh, and the "--" is just a good idea when you know the rest
  31  * will be filenames. Just so that you wouldn't have a filename
  32  * of "-a" causing problems (not possible in the above example,
  33  * but get used to it in scripting!).
  34  */
  35 #include "cache.h"
  36
  37 static const char *prefix;
  38 static int prefix_length;
  39 static int checkout_stage; /* default to checkout stage0 */
  40
  41 static struct checkout state = {
  42         .base_dir = "",
  43         .base_dir_len = 0,
  44         .force = 0,
  45         .quiet = 0,
  46         .not_new = 0,
  47         .refresh_cache = 0,
  48 };
  49
  50 static int checkout_file(const char *name)
  51 {
  52         int namelen = strlen(name);
  53         int pos = cache_name_pos(name, namelen);
  54         int has_same_name = 0;
  55
  56         if (pos < 0)
  57                 pos = -pos - 1;
  58
  59         while (pos < active_nr) {
  60                 struct cache_entry *ce = active_cache[pos];
  61                 if (ce_namelen(ce) != namelen ||
  62                     memcmp(ce->name, name, namelen))
  63                         break;
  64                 has_same_name = 1;
  65                 if (checkout_stage == ce_stage(ce))
  66                         return checkout_entry(ce, &state);
  67                 pos++;
  68         }
  69
  70         if (!state.quiet) {
  71                 fprintf(stderr, "git-checkout-index: %s ", name);
  72                 if (!has_same_name)
  73                         fprintf(stderr, "is not in the cache");
  74                 else if (checkout_stage)
  75                         fprintf(stderr, "does not exist at stage %d",
  76                                 checkout_stage);
  77                 else
  78                         fprintf(stderr, "is unmerged");
  79                 fputc('\n', stderr);
  80         }
  81         return -1;
  82 }
  83
  84 static int checkout_all(void)
  85 {
  86         int i, errs = 0;
  87
  88         for (i = 0; i < active_nr ; i++) {
  89                 struct cache_entry *ce = active_cache[i];
  90                 if (ce_stage(ce) != checkout_stage)
  91                         continue;
  92                 if (prefix && *prefix &&
  93                     (ce_namelen(ce) <= prefix_length ||
  94                      memcmp(prefix, ce->name, prefix_length)))
  95                         continue;
  96                 if (checkout_entry(ce, &state) < 0)
  97                         errs++;
  98         }
  99         if (errs)
 100                 /* we have already done our error reporting.
 101                  * exit with the same code as die().
 102                  */
 103                 exit(128);
 104         return 0;
 105 }
 106
 107 static const char checkout_cache_usage[] =
 108 "git-checkout-index [-u] [-q] [-a] [-f] [-n] [--stage=[123]] [--prefix=<string>] [--] <file>...";
 109
 110 static struct cache_file cache_file;
 111
 112 int main(int argc, char **argv)
 113 {
 114         int i;
 115         int newfd = -1;
 116         int all = 0;
 117
 118         prefix = setup_git_directory();
 119         prefix_length = prefix ? strlen(prefix) : 0;
 120
 121         if (read_cache() < 0) {
 122                 die("invalid cache");
 123         }
 124
 125         for (i = 1; i < argc; i++) {
 126                 const char *arg = argv[i];
 127
 128                 if (!strcmp(arg, "--")) {
 129                         i++;
 130                         break;
 131                 }
 132                 if (!strcmp(arg, "-a") || !strcmp(arg, "--all")) {
 133                         all = 1;
 134                         continue;
 135                 }
 136                 if (!strcmp(arg, "-f") || !strcmp(arg, "--force")) {
 137                         state.force = 1;
 138                         continue;
 139                 }
 140                 if (!strcmp(arg, "-q") || !strcmp(arg, "--quiet")) {
 141                         state.quiet = 1;
 142                         continue;
 143                 }
 144                 if (!strcmp(arg, "-n") || !strcmp(arg, "--no-create")) {
 145                         state.not_new = 1;
 146                         continue;
 147                 }
 148                 if (!strcmp(arg, "-u") || !strcmp(arg, "--index")) {
 149                         state.refresh_cache = 1;
 150                         if (newfd < 0)
 151                                 newfd = hold_index_file_for_update
 152                                         (&cache_file,
 153                                          get_index_file());
 154                         if (newfd < 0)
 155                                 die("cannot open index.lock file.");
 156                         continue;
 157                 }
 158                 if (!strncmp(arg, "--prefix=", 9)) {
 159                         state.base_dir = arg+9;
 160                         state.base_dir_len = strlen(state.base_dir);
 161                         continue;
 162                 }
 163                 if (!strncmp(arg, "--stage=", 8)) {
 164                         int ch = arg[8];
 165                         if ('1' <= ch && ch <= '3')
 166                                 checkout_stage = arg[8] - '0';
 167                         else
 168                                 die("stage should be between 1 and 3");
 169                         continue;
 170                 }
 171                 if (arg[0] == '-')
 172                         usage(checkout_cache_usage);
 173                 break;
 174         }
 175
 176         if (state.base_dir_len) {
 177                 /* when --prefix is specified we do not
 178                  * want to update cache.
 179                  */
 180                 if (state.refresh_cache) {
 181                         close(newfd); newfd = -1;
 182                         rollback_index_file(&cache_file);
 183                 }
 184                 state.refresh_cache = 0;
 185         }
 186
 187         /* Check out named files first */
 188         for ( ; i < argc; i++) {
 189                 const char *arg = argv[i];
 190
 191                 if (all)
 192                         die("git-checkout-index: don't mix '--all' and explicit filenames");
 193                 checkout_file(prefix_path(prefix, prefix_length, arg));
 194         }
 195
 196         if (all)
 197                 checkout_all();
 198
 199         if (0 <= newfd &&
 200             (write_cache(newfd, active_cache, active_nr) ||
 201              commit_index_file(&cache_file)))
 202                 die("Unable to write new cachefile");
 203         return 0;
 204 }