Andrew's git - gitweb.git/blob

   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-cache -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-cache" does nothing. You probably
  16 * meant "git-checkout-cache -a". And if you want to force it, you
  17 * want "git-checkout-cache -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-cache -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 struct checkout state = {
  38        .base_dir = "",
  39        .base_dir_len = 0,
  40        .force = 0,
  41        .quiet = 0,
  42        .not_new = 0,
  43        .refresh_cache = 0,
  44};
  45
  46static int checkout_file(const char *name)
  47{
  48        int pos = cache_name_pos(name, strlen(name));
  49        if (pos < 0) {
  50                if (!state.quiet) {
  51                        pos = -pos - 1;
  52                        fprintf(stderr,
  53                                "git-checkout-cache: %s is %s.\n",
  54                                name,
  55                                (pos < active_nr &&
  56                                 !strcmp(active_cache[pos]->name, name)) ?
  57                                "unmerged" : "not in the cache");
  58                }
  59                return -1;
  60        }
  61        return checkout_entry(active_cache[pos], &state);
  62}
  63
  64static int checkout_all(void)
  65{
  66        int i;
  67
  68        for (i = 0; i < active_nr ; i++) {
  69                struct cache_entry *ce = active_cache[i];
  70                if (ce_stage(ce))
  71                        continue;
  72                if (checkout_entry(ce, &state) < 0)
  73                        return -1;
  74        }
  75        return 0;
  76}
  77
  78static const char *checkout_cache_usage =
  79"git-checkout-cache [-u] [-q] [-a] [-f] [-n] [--prefix=<string>] [--] <file>...";
  80
  81int main(int argc, char **argv)
  82{
  83        int i, force_filename = 0;
  84        struct cache_file cache_file;
  85        int newfd = -1;
  86
  87        if (read_cache() < 0) {
  88                die("invalid cache");
  89        }
  90
  91        for (i = 1; i < argc; i++) {
  92                const char *arg = argv[i];
  93                if (!force_filename) {
  94                        if (!strcmp(arg, "-a")) {
  95                                checkout_all();
  96                                continue;
  97                        }
  98                        if (!strcmp(arg, "--")) {
  99                                force_filename = 1;
 100                                continue;
 101                        }
 102                        if (!strcmp(arg, "-f")) {
 103                                state.force = 1;
 104                                continue;
 105                        }
 106                        if (!strcmp(arg, "-q")) {
 107                                state.quiet = 1;
 108                                continue;
 109                        }
 110                        if (!strcmp(arg, "-n")) {
 111                                state.not_new = 1;
 112                                continue;
 113                        }
 114                        if (!strcmp(arg, "-u")) {
 115                                state.refresh_cache = 1;
 116                                if (newfd < 0)
 117                                        newfd = hold_index_file_for_update
 118                                                (&cache_file,
 119                                                 get_index_file());
 120                                if (newfd < 0)
 121                                        die("cannot open index.lock file.");
 122                                continue;
 123                        }
 124                        if (!memcmp(arg, "--prefix=", 9)) {
 125                                state.base_dir = arg+9;
 126                                state.base_dir_len = strlen(state.base_dir);
 127                                continue;
 128                        }
 129                        if (arg[0] == '-')
 130                                usage(checkout_cache_usage);
 131                }
 132                if (state.base_dir_len) {
 133                        /* when --prefix is specified we do not
 134                         * want to update cache.
 135                         */
 136                        if (state.refresh_cache) {
 137                                close(newfd); newfd = -1;
 138                                rollback_index_file(&cache_file);
 139                        }
 140                        state.refresh_cache = 0;
 141                }
 142                checkout_file(arg);
 143        }
 144
 145        if (0 <= newfd &&
 146            (write_cache(newfd, active_cache, active_nr) ||
 147             commit_index_file(&cache_file)))
 148                die("Unable to write new cachefile");
 149        return 0;
 150}