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
  40 static struct checkout state = {
  41         .base_dir = "",
  42         .base_dir_len = 0,
  43         .force = 0,
  44         .quiet = 0,
  45         .not_new = 0,
  46         .refresh_cache = 0,
  47 };
  48
  49 static int checkout_file(const char *name)
  50 {
  51         int pos = cache_name_pos(name, strlen(name));
  52         if (pos < 0) {
  53                 if (!state.quiet) {
  54                         pos = -pos - 1;
  55                         fprintf(stderr,
  56                                 "git-checkout-index: %s is %s.\n",
  57                                 name,
  58                                 (pos < active_nr &&
  59                                  !strcmp(active_cache[pos]->name, name)) ?
  60                                 "unmerged" : "not in the cache");
  61                 }
  62                 return -1;
  63         }
  64         return checkout_entry(active_cache[pos], &state);
  65 }
  66
  67 static int checkout_all(void)
  68 {
  69         int i, errs = 0;
  70
  71         for (i = 0; i < active_nr ; i++) {
  72                 struct cache_entry *ce = active_cache[i];
  73                 if (ce_stage(ce))
  74                         continue;
  75                 if (prefix && *prefix &&
  76                     ( ce_namelen(ce) <= prefix_length ||
  77                       memcmp(prefix, ce->name, prefix_length) ))
  78                         continue;
  79                 if (checkout_entry(ce, &state) < 0)
  80                         errs++;
  81         }
  82         if (errs)
  83                 /* we have already done our error reporting.
  84                  * exit with the same code as die().
  85                  */
  86                 exit(128);
  87         return 0;
  88 }
  89
  90 static const char checkout_cache_usage[] =
  91 "git-checkout-index [-u] [-q] [-a] [-f] [-n] [--prefix=<string>] [--] <file>...";
  92
  93 static struct cache_file cache_file;
  94
  95 int main(int argc, char **argv)
  96 {
  97         int i;
  98         int newfd = -1;
  99         int all = 0;
 100
 101         prefix = setup_git_directory();
 102         prefix_length = prefix ? strlen(prefix) : 0;
 103
 104         if (read_cache() < 0) {
 105                 die("invalid cache");
 106         }
 107
 108         for (i = 1; i < argc; i++) {
 109                 const char *arg = argv[i];
 110
 111                 if (!strcmp(arg, "--")) {
 112                         i++;
 113                         break;
 114                 }
 115                 if (!strcmp(arg, "-a") || !strcmp(arg, "--all")) {
 116                         all = 1;
 117                         continue;
 118                 }
 119                 if (!strcmp(arg, "-f") || !strcmp(arg, "--force")) {
 120                         state.force = 1;
 121                         continue;
 122                 }
 123                 if (!strcmp(arg, "-q") || !strcmp(arg, "--quiet")) {
 124                         state.quiet = 1;
 125                         continue;
 126                 }
 127                 if (!strcmp(arg, "-n") || !strcmp(arg, "--no-create")) {
 128                         state.not_new = 1;
 129                         continue;
 130                 }
 131                 if (!strcmp(arg, "-u") || !strcmp(arg, "--index")) {
 132                         state.refresh_cache = 1;
 133                         if (newfd < 0)
 134                                 newfd = hold_index_file_for_update
 135                                         (&cache_file,
 136                                          get_index_file());
 137                         if (newfd < 0)
 138                                 die("cannot open index.lock file.");
 139                         continue;
 140                 }
 141                 if (!memcmp(arg, "--prefix=", 9)) {
 142                         state.base_dir = arg+9;
 143                         state.base_dir_len = strlen(state.base_dir);
 144                         continue;
 145                 }
 146                 if (arg[0] == '-')
 147                         usage(checkout_cache_usage);
 148                 break;
 149         }
 150
 151         if (state.base_dir_len) {
 152                 /* when --prefix is specified we do not
 153                  * want to update cache.
 154                  */
 155                 if (state.refresh_cache) {
 156                         close(newfd); newfd = -1;
 157                         rollback_index_file(&cache_file);
 158                 }
 159                 state.refresh_cache = 0;
 160         }
 161
 162         /* Check out named files first */
 163         for ( ; i < argc; i++) {
 164                 const char *arg = argv[i];
 165
 166                 if (all)
 167                         die("git-checkout-index: don't mix '--all' and explicit filenames");
 168                 checkout_file(prefix_path(prefix, prefix_length, arg));
 169         }
 170
 171         if (all)
 172                 checkout_all();
 173
 174         if (0 <= newfd &&
 175             (write_cache(newfd, active_cache, active_nr) ||
 176              commit_index_file(&cache_file)))
 177                 die("Unable to write new cachefile");
 178         return 0;
 179 }