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 *      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 "checkout-cache" does nothing. You probably
  16 * meant "checkout-cache -a". And if you want to force it, you
  17 * want "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 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 int force = 0, quiet = 0;
  38
  39static int write_entry(struct cache_entry *ce)
  40{
  41        int fd;
  42        void *new;
  43        unsigned long size;
  44        long wrote;
  45
  46        new = read_sha1_file(ce->sha1, "blob", &size);
  47        if (!new) {
  48                fprintf(stderr, "checkout-cache: unable to read sha1 file of %s (%s)",
  49                        ce->name, sha1_to_hex(ce->sha1));
  50                return -1;
  51        }
  52        fd = open(ce->name, O_WRONLY | O_CREAT | O_TRUNC, 0600);
  53        if (fd < 0) {
  54                fprintf(stderr, "checkout-cache: unable to create %s (%s)",
  55                        ce->name, strerror(errno));
  56                free(new);
  57                return -1;
  58        }
  59        wrote = write(fd, new, size);
  60        close(fd);
  61        free(new);
  62        if (wrote == size)
  63                return 0;
  64        fprintf(stderr, "checkout-cache: unable to write %s", ce->name);
  65        return -1;
  66}
  67
  68static int checkout_entry(struct cache_entry *ce)
  69{
  70        if (!force) {
  71                struct stat st;
  72
  73                if (!stat(ce->name, &st)) {
  74                        unsigned changed = cache_match_stat(ce, &st);
  75                        if (!changed)
  76                                return 0;
  77                        if (!quiet)
  78                                fprintf(stderr, "checkout-cache: %s already exists", ce->name);
  79                        return -1;
  80                }
  81        }
  82        return write_entry(ce);
  83}
  84
  85static int checkout_file(const char *name)
  86{
  87        int pos = cache_name_pos(name, strlen(name));
  88        if (pos < 0) {
  89                if (!quiet)
  90                        fprintf(stderr, "checkout-cache: %s is not in the cache", name);
  91                return -1;
  92        }
  93        return checkout_entry(active_cache[pos]);
  94}
  95
  96static int checkout_all(void)
  97{
  98        int i;
  99
 100        for (i = 0; i < active_nr ; i++) {
 101                struct cache_entry *ce = active_cache[i];
 102                if (checkout_entry(ce) < 0)
 103                        return -1;
 104        }
 105        return 0;
 106}
 107
 108int main(int argc, char **argv)
 109{
 110        int i, force_filename = 0;
 111
 112        if (read_cache() < 0) {
 113                fprintf(stderr, "Invalid cache");
 114                exit(1);
 115        }
 116
 117        for (i = 1; i < argc; i++) {
 118                const char *arg = argv[i];
 119                if (!force_filename) {
 120                        if (!strcmp(arg, "-a")) {
 121                                checkout_all();
 122                                continue;
 123                        }
 124                        if (!strcmp(arg, "--")) {
 125                                force_filename = 1;
 126                                continue;
 127                        }
 128                        if (!strcmp(arg, "-f")) {
 129                                force = 1;
 130                                continue;
 131                        }
 132                        if (!strcmp(arg, "-q")) {
 133                                quiet = 1;
 134                                continue;
 135                        }
 136                }
 137                checkout_file(arg);
 138        }
 139        return 0;
 140}