Andrew's git - gitweb.git/blob

   1#include "cache.h"
   2#include "blob.h"
   3
   4static void create_directories(const char *path, const struct checkout *state)
   5{
   6        int len = strlen(path);
   7        char *buf = xmalloc(len + 1);
   8        const char *slash = path;
   9
  10        while ((slash = strchr(slash+1, '/')) != NULL) {
  11                struct stat st;
  12                int stat_status;
  13
  14                len = slash - path;
  15                memcpy(buf, path, len);
  16                buf[len] = 0;
  17
  18                if (len <= state->base_dir_len)
  19                        /*
  20                         * checkout-index --prefix=<dir>; <dir> is
  21                         * allowed to be a symlink to an existing
  22                         * directory.
  23                         */
  24                        stat_status = stat(buf, &st);
  25                else
  26                        /*
  27                         * if there currently is a symlink, we would
  28                         * want to replace it with a real directory.
  29                         */
  30                        stat_status = lstat(buf, &st);
  31
  32                if (!stat_status && S_ISDIR(st.st_mode))
  33                        continue; /* ok, it is already a directory. */
  34
  35                /*
  36                 * We know stat_status == 0 means something exists
  37                 * there and this mkdir would fail, but that is an
  38                 * error codepath; we do not care, as we unlink and
  39                 * mkdir again in such a case.
  40                 */
  41                if (mkdir(buf, 0777)) {
  42                        if (errno == EEXIST && state->force &&
  43                            !unlink(buf) && !mkdir(buf, 0777))
  44                                continue;
  45                        die("cannot create directory at %s", buf);
  46                }
  47        }
  48        free(buf);
  49}
  50
  51static void remove_subtree(const char *path)
  52{
  53        DIR *dir = opendir(path);
  54        struct dirent *de;
  55        char pathbuf[PATH_MAX];
  56        char *name;
  57
  58        if (!dir)
  59                die("cannot opendir %s (%s)", path, strerror(errno));
  60        strcpy(pathbuf, path);
  61        name = pathbuf + strlen(path);
  62        *name++ = '/';
  63        while ((de = readdir(dir)) != NULL) {
  64                struct stat st;
  65                if ((de->d_name[0] == '.') &&
  66                    ((de->d_name[1] == 0) ||
  67                     ((de->d_name[1] == '.') && de->d_name[2] == 0)))
  68                        continue;
  69                strcpy(name, de->d_name);
  70                if (lstat(pathbuf, &st))
  71                        die("cannot lstat %s (%s)", pathbuf, strerror(errno));
  72                if (S_ISDIR(st.st_mode))
  73                        remove_subtree(pathbuf);
  74                else if (unlink(pathbuf))
  75                        die("cannot unlink %s (%s)", pathbuf, strerror(errno));
  76        }
  77        closedir(dir);
  78        if (rmdir(path))
  79                die("cannot rmdir %s (%s)", path, strerror(errno));
  80}
  81
  82static int create_file(const char *path, unsigned int mode)
  83{
  84        mode = (mode & 0100) ? 0777 : 0666;
  85        return open(path, O_WRONLY | O_CREAT | O_EXCL, mode);
  86}
  87
  88static void *read_blob_entry(struct cache_entry *ce, const char *path, unsigned long *size)
  89{
  90        enum object_type type;
  91        void *new = read_sha1_file(ce->sha1, &type, size);
  92
  93        if (new) {
  94                if (type == OBJ_BLOB)
  95                        return new;
  96                free(new);
  97        }
  98        return NULL;
  99}
 100
 101static int write_entry(struct cache_entry *ce, char *path, const struct checkout *state, int to_tempfile)
 102{
 103        int fd;
 104        long wrote;
 105
 106        switch (ce->ce_mode & S_IFMT) {
 107                char *new;
 108                struct strbuf buf;
 109                unsigned long size;
 110
 111        case S_IFREG:
 112                new = read_blob_entry(ce, path, &size);
 113                if (!new)
 114                        return error("git-checkout-index: unable to read sha1 file of %s (%s)",
 115                                path, sha1_to_hex(ce->sha1));
 116
 117                /*
 118                 * Convert from git internal format to working tree format
 119                 */
 120                strbuf_init(&buf, 0);
 121                if (convert_to_working_tree(ce->name, new, size, &buf)) {
 122                        size_t newsize = 0;
 123                        free(new);
 124                        new = strbuf_detach(&buf, &newsize);
 125                        size = newsize;
 126                }
 127
 128                if (to_tempfile) {
 129                        strcpy(path, ".merge_file_XXXXXX");
 130                        fd = mkstemp(path);
 131                } else
 132                        fd = create_file(path, ce->ce_mode);
 133                if (fd < 0) {
 134                        free(new);
 135                        return error("git-checkout-index: unable to create file %s (%s)",
 136                                path, strerror(errno));
 137                }
 138
 139                wrote = write_in_full(fd, new, size);
 140                close(fd);
 141                free(new);
 142                if (wrote != size)
 143                        return error("git-checkout-index: unable to write file %s", path);
 144                break;
 145        case S_IFLNK:
 146                new = read_blob_entry(ce, path, &size);
 147                if (!new)
 148                        return error("git-checkout-index: unable to read sha1 file of %s (%s)",
 149                                path, sha1_to_hex(ce->sha1));
 150                if (to_tempfile || !has_symlinks) {
 151                        if (to_tempfile) {
 152                                strcpy(path, ".merge_link_XXXXXX");
 153                                fd = mkstemp(path);
 154                        } else
 155                                fd = create_file(path, 0666);
 156                        if (fd < 0) {
 157                                free(new);
 158                                return error("git-checkout-index: unable to create "
 159                                                 "file %s (%s)", path, strerror(errno));
 160                        }
 161                        wrote = write_in_full(fd, new, size);
 162                        close(fd);
 163                        free(new);
 164                        if (wrote != size)
 165                                return error("git-checkout-index: unable to write file %s",
 166                                        path);
 167                } else {
 168                        wrote = symlink(new, path);
 169                        free(new);
 170                        if (wrote)
 171                                return error("git-checkout-index: unable to create "
 172                                                 "symlink %s (%s)", path, strerror(errno));
 173                }
 174                break;
 175        case S_IFGITLINK:
 176                if (to_tempfile)
 177                        return error("git-checkout-index: cannot create temporary subproject %s", path);
 178                if (mkdir(path, 0777) < 0)
 179                        return error("git-checkout-index: cannot create subproject directory %s", path);
 180                break;
 181        default:
 182                return error("git-checkout-index: unknown file mode for %s", path);
 183        }
 184
 185        if (state->refresh_cache) {
 186                struct stat st;
 187                lstat(ce->name, &st);
 188                fill_stat_cache_info(ce, &st);
 189        }
 190        return 0;
 191}
 192
 193int checkout_entry(struct cache_entry *ce, const struct checkout *state, char *topath)
 194{
 195        static char path[PATH_MAX + 1];
 196        struct stat st;
 197        int len = state->base_dir_len;
 198
 199        if (topath)
 200                return write_entry(ce, topath, state, 1);
 201
 202        memcpy(path, state->base_dir, len);
 203        strcpy(path + len, ce->name);
 204
 205        if (!lstat(path, &st)) {
 206                unsigned changed = ce_match_stat(ce, &st, CE_MATCH_IGNORE_VALID);
 207                if (!changed)
 208                        return 0;
 209                if (!state->force) {
 210                        if (!state->quiet)
 211                                fprintf(stderr, "git-checkout-index: %s already exists\n", path);
 212                        return -1;
 213                }
 214
 215                /*
 216                 * We unlink the old file, to get the new one with the
 217                 * right permissions (including umask, which is nasty
 218                 * to emulate by hand - much easier to let the system
 219                 * just do the right thing)
 220                 */
 221                if (S_ISDIR(st.st_mode)) {
 222                        /* If it is a gitlink, leave it alone! */
 223                        if (S_ISGITLINK(ce->ce_mode))
 224                                return 0;
 225                        if (!state->force)
 226                                return error("%s is a directory", path);
 227                        remove_subtree(path);
 228                } else if (unlink(path))
 229                        return error("unable to unlink old '%s' (%s)", path, strerror(errno));
 230        } else if (state->not_new)
 231                return 0;
 232        create_directories(path, state);
 233        return write_entry(ce, path, state, 0);
 234}