checkout-index.con commit Merge part of 'lt/rev-list' into 'fk/blame' (c406104)
   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
  37static const char *prefix;
  38static int prefix_length;
  39static int checkout_stage; /* default to checkout stage0 */
  40
  41static 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
  50static 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
  84static 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
 107static const char checkout_cache_usage[] =
 108"git-checkout-index [-u] [-q] [-a] [-f] [-n] [--stage=[123]] [--prefix=<string>] [--] <file>...";
 109
 110static struct cache_file cache_file;
 111
 112int main(int argc, char **argv)
 113{
 114        int i;
 115        int newfd = -1;
 116        int all = 0;
 117
 118        prefix = setup_git_directory();
 119        git_config(git_default_config);
 120        prefix_length = prefix ? strlen(prefix) : 0;
 121
 122        if (read_cache() < 0) {
 123                die("invalid cache");
 124        }
 125
 126        for (i = 1; i < argc; i++) {
 127                const char *arg = argv[i];
 128
 129                if (!strcmp(arg, "--")) {
 130                        i++;
 131                        break;
 132                }
 133                if (!strcmp(arg, "-a") || !strcmp(arg, "--all")) {
 134                        all = 1;
 135                        continue;
 136                }
 137                if (!strcmp(arg, "-f") || !strcmp(arg, "--force")) {
 138                        state.force = 1;
 139                        continue;
 140                }
 141                if (!strcmp(arg, "-q") || !strcmp(arg, "--quiet")) {
 142                        state.quiet = 1;
 143                        continue;
 144                }
 145                if (!strcmp(arg, "-n") || !strcmp(arg, "--no-create")) {
 146                        state.not_new = 1;
 147                        continue;
 148                }
 149                if (!strcmp(arg, "-u") || !strcmp(arg, "--index")) {
 150                        state.refresh_cache = 1;
 151                        if (newfd < 0)
 152                                newfd = hold_index_file_for_update
 153                                        (&cache_file,
 154                                         get_index_file());
 155                        if (newfd < 0)
 156                                die("cannot open index.lock file.");
 157                        continue;
 158                }
 159                if (!strncmp(arg, "--prefix=", 9)) {
 160                        state.base_dir = arg+9;
 161                        state.base_dir_len = strlen(state.base_dir);
 162                        continue;
 163                }
 164                if (!strncmp(arg, "--stage=", 8)) {
 165                        int ch = arg[8];
 166                        if ('1' <= ch && ch <= '3')
 167                                checkout_stage = arg[8] - '0';
 168                        else
 169                                die("stage should be between 1 and 3");
 170                        continue;
 171                }
 172                if (arg[0] == '-')
 173                        usage(checkout_cache_usage);
 174                break;
 175        }
 176
 177        if (state.base_dir_len) {
 178                /* when --prefix is specified we do not
 179                 * want to update cache.
 180                 */
 181                if (state.refresh_cache) {
 182                        close(newfd); newfd = -1;
 183                        rollback_index_file(&cache_file);
 184                }
 185                state.refresh_cache = 0;
 186        }
 187
 188        /* Check out named files first */
 189        for ( ; i < argc; i++) {
 190                const char *arg = argv[i];
 191
 192                if (all)
 193                        die("git-checkout-index: don't mix '--all' and explicit filenames");
 194                checkout_file(prefix_path(prefix, prefix_length, arg));
 195        }
 196
 197        if (all)
 198                checkout_all();
 199
 200        if (0 <= newfd &&
 201            (write_cache(newfd, active_cache, active_nr) ||
 202             commit_index_file(&cache_file)))
 203                die("Unable to write new cachefile");
 204        return 0;
 205}