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 void create_directories(const char *path)
  40{
  41        int len = strlen(path);
  42        char *buf = malloc(len + 1);
  43        const char *slash = path;
  44
  45        while ((slash = strchr(slash+1, '/')) != NULL) {
  46                len = slash - path;
  47                memcpy(buf, path, len);
  48                buf[len] = 0;
  49                mkdir(buf, 0755);
  50        }
  51}
  52
  53static int create_file(const char *path, unsigned int mode)
  54{
  55        int fd = open(path, O_WRONLY | O_TRUNC | O_CREAT, 0600);
  56        if (fd < 0) {
  57                if (errno == ENOENT) {
  58                        create_directories(path);
  59                        fd = open(path, O_WRONLY | O_TRUNC | O_CREAT, 0600);
  60                }
  61        }
  62        if (fd >= 0)
  63                fchmod(fd, mode);
  64        return fd;
  65}
  66
  67static int write_entry(struct cache_entry *ce)
  68{
  69        int fd;
  70        void *new;
  71        unsigned long size;
  72        long wrote;
  73        char type[20];
  74
  75        new = read_sha1_file(ce->sha1, type, &size);
  76        if (!new || strcmp(type, "blob")) {
  77                fprintf(stderr, "checkout-cache: unable to read sha1 file of %s (%s)\n",
  78                        ce->name, sha1_to_hex(ce->sha1));
  79                return -1;
  80        }
  81        fd = create_file(ce->name, ce->st_mode);
  82        if (fd < 0) {
  83                fprintf(stderr, "checkout-cache: unable to create %s (%s)\n",
  84                        ce->name, strerror(errno));
  85                free(new);
  86                return -1;
  87        }
  88        wrote = write(fd, new, size);
  89        close(fd);
  90        free(new);
  91        if (wrote == size)
  92                return 0;
  93        fprintf(stderr, "checkout-cache: unable to write %s\n", ce->name);
  94        return -1;
  95}
  96
  97static int checkout_entry(struct cache_entry *ce)
  98{
  99        if (!force) {
 100                struct stat st;
 101
 102                if (!stat(ce->name, &st)) {
 103                        unsigned changed = cache_match_stat(ce, &st);
 104                        if (changed && !quiet)
 105                                fprintf(stderr, "checkout-cache: %s already exists\n", ce->name);
 106                        return 0;
 107                }
 108        }
 109        return write_entry(ce);
 110}
 111
 112static int checkout_file(const char *name)
 113{
 114        int pos = cache_name_pos(name, strlen(name));
 115        if (pos < 0) {
 116                if (!quiet)
 117                        fprintf(stderr, "checkout-cache: %s is not in the cache\n", name);
 118                return -1;
 119        }
 120        return checkout_entry(active_cache[pos]);
 121}
 122
 123static int checkout_all(void)
 124{
 125        int i;
 126
 127        for (i = 0; i < active_nr ; i++) {
 128                struct cache_entry *ce = active_cache[i];
 129                if (checkout_entry(ce) < 0)
 130                        return -1;
 131        }
 132        return 0;
 133}
 134
 135int main(int argc, char **argv)
 136{
 137        int i, force_filename = 0;
 138
 139        if (read_cache() < 0) {
 140                fprintf(stderr, "Invalid cache\n");
 141                exit(1);
 142        }
 143
 144        for (i = 1; i < argc; i++) {
 145                const char *arg = argv[i];
 146                if (!force_filename) {
 147                        if (!strcmp(arg, "-a")) {
 148                                checkout_all();
 149                                continue;
 150                        }
 151                        if (!strcmp(arg, "--")) {
 152                                force_filename = 1;
 153                                continue;
 154                        }
 155                        if (!strcmp(arg, "-f")) {
 156                                force = 1;
 157                                continue;
 158                        }
 159                        if (!strcmp(arg, "-q")) {
 160                                quiet = 1;
 161                                continue;
 162                        }
 163                }
 164                checkout_file(arg);
 165        }
 166        return 0;
 167}