update-cache.con commit [PATCH] Constness fix for pickaxe option. (057c7d3)
   1/*
   2 * GIT - The information manager from hell
   3 *
   4 * Copyright (C) Linus Torvalds, 2005
   5 */
   6#include "cache.h"
   7
   8/*
   9 * Default to not allowing changes to the list of files. The
  10 * tool doesn't actually care, but this makes it harder to add
  11 * files to the revision control by mistake by doing something
  12 * like "git-update-cache *" and suddenly having all the object
  13 * files be revision controlled.
  14 */
  15static int allow_add = 0, allow_remove = 0, allow_replace = 0, not_new = 0;
  16
  17/* Three functions to allow overloaded pointer return; see linux/err.h */
  18static inline void *ERR_PTR(long error)
  19{
  20        return (void *) error;
  21}
  22
  23static inline long PTR_ERR(const void *ptr)
  24{
  25        return (long) ptr;
  26}
  27
  28static inline long IS_ERR(const void *ptr)
  29{
  30        return (unsigned long)ptr > (unsigned long)-1000L;
  31}
  32
  33static int add_file_to_cache(char *path)
  34{
  35        int size, namelen, option, status;
  36        struct cache_entry *ce;
  37        struct stat st;
  38        int fd;
  39        char *target;
  40
  41        status = lstat(path, &st);
  42        if (status < 0 || S_ISDIR(st.st_mode)) {
  43                /* When we used to have "path" and now we want to add
  44                 * "path/file", we need a way to remove "path" before
  45                 * being able to add "path/file".  However,
  46                 * "git-update-cache --remove path" would not work.
  47                 * --force-remove can be used but this is more user
  48                 * friendly, especially since we can do the opposite
  49                 * case just fine without --force-remove.
  50                 */
  51                if (status == 0 || (errno == ENOENT || errno == ENOTDIR)) {
  52                        if (allow_remove)
  53                                return remove_file_from_cache(path);
  54                }
  55                return error("open(\"%s\"): %s", path, strerror(errno));
  56        }
  57        namelen = strlen(path);
  58        size = cache_entry_size(namelen);
  59        ce = xmalloc(size);
  60        memset(ce, 0, size);
  61        memcpy(ce->name, path, namelen);
  62        fill_stat_cache_info(ce, &st);
  63        ce->ce_mode = create_ce_mode(st.st_mode);
  64        ce->ce_flags = htons(namelen);
  65        switch (st.st_mode & S_IFMT) {
  66        case S_IFREG:
  67                fd = open(path, O_RDONLY);
  68                if (fd < 0)
  69                        return -1;
  70                if (index_fd(ce->sha1, fd, &st) < 0)
  71                        return -1;
  72                break;
  73        case S_IFLNK:
  74                target = xmalloc(st.st_size+1);
  75                if (readlink(path, target, st.st_size+1) != st.st_size) {
  76                        free(target);
  77                        return -1;
  78                }
  79                if (write_sha1_file(target, st.st_size, "blob", ce->sha1))
  80                        return -1;
  81                free(target);
  82                break;
  83        default:
  84                return -1;
  85        }
  86        option = allow_add ? ADD_CACHE_OK_TO_ADD : 0;
  87        option |= allow_replace ? ADD_CACHE_OK_TO_REPLACE : 0;
  88        return add_cache_entry(ce, option);
  89}
  90
  91static int match_data(int fd, void *buffer, unsigned long size)
  92{
  93        while (size) {
  94                char compare[1024];
  95                int ret = read(fd, compare, sizeof(compare));
  96
  97                if (ret <= 0 || ret > size || memcmp(buffer, compare, ret))
  98                        return -1;
  99                size -= ret;
 100                buffer += ret;
 101        }
 102        return 0;
 103}
 104
 105static int compare_data(struct cache_entry *ce, unsigned long expected_size)
 106{
 107        int match = -1;
 108        int fd = open(ce->name, O_RDONLY);
 109
 110        if (fd >= 0) {
 111                void *buffer;
 112                unsigned long size;
 113                char type[20];
 114
 115                buffer = read_sha1_file(ce->sha1, type, &size);
 116                if (buffer) {
 117                        if (size == expected_size && !strcmp(type, "blob"))
 118                                match = match_data(fd, buffer, size);
 119                        free(buffer);
 120                }
 121                close(fd);
 122        }
 123        return match;
 124}
 125
 126static int compare_link(struct cache_entry *ce, unsigned long expected_size)
 127{
 128        int match = -1;
 129        char *target;
 130        void *buffer;
 131        unsigned long size;
 132        char type[10];
 133        int len;
 134
 135        target = xmalloc(expected_size);
 136        len = readlink(ce->name, target, expected_size);
 137        if (len != expected_size) {
 138                free(target);
 139                return -1;
 140        }
 141        buffer = read_sha1_file(ce->sha1, type, &size);
 142        if (!buffer) {
 143                free(target);
 144                return -1;
 145        }
 146        if (size == expected_size)
 147                match = memcmp(buffer, target, size);
 148        free(buffer);
 149        free(target);
 150        return match;
 151}
 152
 153/*
 154 * "refresh" does not calculate a new sha1 file or bring the
 155 * cache up-to-date for mode/content changes. But what it
 156 * _does_ do is to "re-match" the stat information of a file
 157 * with the cache, so that you can refresh the cache for a
 158 * file that hasn't been changed but where the stat entry is
 159 * out of date.
 160 *
 161 * For example, you'd want to do this after doing a "git-read-tree",
 162 * to link up the stat cache details with the proper files.
 163 */
 164static struct cache_entry *refresh_entry(struct cache_entry *ce)
 165{
 166        struct stat st;
 167        struct cache_entry *updated;
 168        int changed, size;
 169
 170        if (lstat(ce->name, &st) < 0)
 171                return ERR_PTR(-errno);
 172
 173        changed = ce_match_stat(ce, &st);
 174        if (!changed)
 175                return ce;
 176
 177        /*
 178         * If the mode or type has changed, there's no point in trying
 179         * to refresh the entry - it's not going to match
 180         */
 181        if (changed & (MODE_CHANGED | TYPE_CHANGED))
 182                return ERR_PTR(-EINVAL);
 183
 184        switch (st.st_mode & S_IFMT) {
 185        case S_IFREG:
 186                if (compare_data(ce, st.st_size))
 187                        return ERR_PTR(-EINVAL);
 188                break;
 189        case S_IFLNK:
 190                if (compare_link(ce, st.st_size))
 191                        return ERR_PTR(-EINVAL);
 192                break;
 193        default:
 194                return ERR_PTR(-EINVAL);
 195        }
 196
 197        size = ce_size(ce);
 198        updated = xmalloc(size);
 199        memcpy(updated, ce, size);
 200        fill_stat_cache_info(updated, &st);
 201        return updated;
 202}
 203
 204static int refresh_cache(void)
 205{
 206        int i;
 207        int has_errors = 0;
 208
 209        for (i = 0; i < active_nr; i++) {
 210                struct cache_entry *ce, *new;
 211                ce = active_cache[i];
 212                if (ce_stage(ce)) {
 213                        printf("%s: needs merge\n", ce->name);
 214                        has_errors = 1;
 215                        while ((i < active_nr) &&
 216                               ! strcmp(active_cache[i]->name, ce->name))
 217                                i++;
 218                        i--;
 219                        continue;
 220                }
 221
 222                new = refresh_entry(ce);
 223                if (IS_ERR(new)) {
 224                        if (!(not_new && PTR_ERR(new) == -ENOENT)) {
 225                                printf("%s: needs update\n", ce->name);
 226                                has_errors = 1;
 227                        }
 228                        continue;
 229                }
 230                active_cache_changed = 1;
 231                /* You can NOT just free active_cache[i] here, since it
 232                 * might not be necessarily malloc()ed but can also come
 233                 * from mmap(). */
 234                active_cache[i] = new;
 235        }
 236        return has_errors;
 237}
 238
 239/*
 240 * We fundamentally don't like some paths: we don't want
 241 * dot or dot-dot anywhere, and in fact, we don't even want
 242 * any other dot-files (.git or anything else). They
 243 * are hidden, for chist sake.
 244 *
 245 * Also, we don't want double slashes or slashes at the
 246 * end that can make pathnames ambiguous.
 247 */
 248static int verify_path(char *path)
 249{
 250        char c;
 251
 252        goto inside;
 253        for (;;) {
 254                if (!c)
 255                        return 1;
 256                if (c == '/') {
 257inside:
 258                        c = *path++;
 259                        if (c != '/' && c != '.' && c != '\0')
 260                                continue;
 261                        return 0;
 262                }
 263                c = *path++;
 264        }
 265}
 266
 267static int add_cacheinfo(char *arg1, char *arg2, char *arg3)
 268{
 269        int size, len, option;
 270        unsigned int mode;
 271        unsigned char sha1[20];
 272        struct cache_entry *ce;
 273
 274        if (sscanf(arg1, "%o", &mode) != 1)
 275                return -1;
 276        if (get_sha1_hex(arg2, sha1))
 277                return -1;
 278        if (!verify_path(arg3))
 279                return -1;
 280
 281        len = strlen(arg3);
 282        size = cache_entry_size(len);
 283        ce = xmalloc(size);
 284        memset(ce, 0, size);
 285
 286        memcpy(ce->sha1, sha1, 20);
 287        memcpy(ce->name, arg3, len);
 288        ce->ce_flags = htons(len);
 289        ce->ce_mode = create_ce_mode(mode);
 290        option = allow_add ? ADD_CACHE_OK_TO_ADD : 0;
 291        option |= allow_replace ? ADD_CACHE_OK_TO_REPLACE : 0;
 292        return add_cache_entry(ce, option);
 293}
 294
 295static struct cache_file cache_file;
 296
 297int main(int argc, char **argv)
 298{
 299        int i, newfd, entries, has_errors = 0;
 300        int allow_options = 1;
 301
 302        newfd = hold_index_file_for_update(&cache_file, get_index_file());
 303        if (newfd < 0)
 304                die("unable to create new cachefile");
 305
 306        entries = read_cache();
 307        if (entries < 0)
 308                die("cache corrupted");
 309
 310        for (i = 1 ; i < argc; i++) {
 311                char *path = argv[i];
 312
 313                if (allow_options && *path == '-') {
 314                        if (!strcmp(path, "--")) {
 315                                allow_options = 0;
 316                                continue;
 317                        }
 318                        if (!strcmp(path, "--add")) {
 319                                allow_add = 1;
 320                                continue;
 321                        }
 322                        if (!strcmp(path, "--replace")) {
 323                                allow_replace = 1;
 324                                continue;
 325                        }
 326                        if (!strcmp(path, "--remove")) {
 327                                allow_remove = 1;
 328                                continue;
 329                        }
 330                        if (!strcmp(path, "--refresh")) {
 331                                has_errors |= refresh_cache();
 332                                continue;
 333                        }
 334                        if (!strcmp(path, "--cacheinfo")) {
 335                                if (i+3 >= argc)
 336                                        die("git-update-cache: --cacheinfo <mode> <sha1> <path>");
 337                                if (add_cacheinfo(argv[i+1], argv[i+2], argv[i+3]))
 338                                        die("git-update-cache: --cacheinfo cannot add %s", argv[i+3]);
 339                                i += 3;
 340                                continue;
 341                        }
 342                        if (!strcmp(path, "--force-remove")) {
 343                                if (argc <= i + 1)
 344                                        die("git-update-cache: --force-remove <path>");
 345                                if (remove_file_from_cache(argv[i+1]))
 346                                        die("git-update-cache: --force-remove cannot remove %s", argv[i+1]);
 347                                i++;
 348                                continue;
 349                        }
 350
 351                        if (!strcmp(path, "--ignore-missing")) {
 352                                not_new = 1;
 353                                continue;
 354                        }
 355                        die("unknown option %s", path);
 356                }
 357                if (!verify_path(path)) {
 358                        fprintf(stderr, "Ignoring path %s\n", argv[i]);
 359                        continue;
 360                }
 361                if (add_file_to_cache(path))
 362                        die("Unable to add %s to database", path);
 363        }
 364        if (write_cache(newfd, active_cache, active_nr) ||
 365            commit_index_file(&cache_file))
 366                die("Unable to write new cachefile");
 367
 368        return has_errors ? 1 : 0;
 369}