Andrew's git - gitweb.git/blob

   1#include "cache.h"
   2#include "blob.h"
   3#include "dir.h"
   4
   5static void create_directories(const char *path, int path_len,
   6                               const struct checkout *state)
   7{
   8        char *buf = xmalloc(path_len + 1);
   9        int len = 0;
  10
  11        while (len < path_len) {
  12                do {
  13                        buf[len] = path[len];
  14                        len++;
  15                } while (len < path_len && path[len] != '/');
  16                if (len >= path_len)
  17                        break;
  18                buf[len] = 0;
  19
  20                /*
  21                 * For 'checkout-index --prefix=<dir>', <dir> is
  22                 * allowed to be a symlink to an existing directory,
  23                 * and we set 'state->base_dir_len' below, such that
  24                 * we test the path components of the prefix with the
  25                 * stat() function instead of the lstat() function.
  26                 */
  27                if (has_dirs_only_path(buf, len, state->base_dir_len))
  28                        continue; /* ok, it is already a directory. */
  29
  30                /*
  31                 * If this mkdir() would fail, it could be that there
  32                 * is already a symlink or something else exists
  33                 * there, therefore we then try to unlink it and try
  34                 * one more time to create the directory.
  35                 */
  36                if (mkdir(buf, 0777)) {
  37                        if (errno == EEXIST && state->force &&
  38                            !unlink_or_warn(buf) && !mkdir(buf, 0777))
  39                                continue;
  40                        die_errno("cannot create directory at '%s'", buf);
  41                }
  42        }
  43        free(buf);
  44}
  45
  46static void remove_subtree(const char *path)
  47{
  48        DIR *dir = opendir(path);
  49        struct dirent *de;
  50        char pathbuf[PATH_MAX];
  51        char *name;
  52
  53        if (!dir)
  54                die_errno("cannot opendir '%s'", path);
  55        strcpy(pathbuf, path);
  56        name = pathbuf + strlen(path);
  57        *name++ = '/';
  58        while ((de = readdir(dir)) != NULL) {
  59                struct stat st;
  60                if (is_dot_or_dotdot(de->d_name))
  61                        continue;
  62                strcpy(name, de->d_name);
  63                if (lstat(pathbuf, &st))
  64                        die_errno("cannot lstat '%s'", pathbuf);
  65                if (S_ISDIR(st.st_mode))
  66                        remove_subtree(pathbuf);
  67                else if (unlink(pathbuf))
  68                        die_errno("cannot unlink '%s'", pathbuf);
  69        }
  70        closedir(dir);
  71        if (rmdir(path))
  72                die_errno("cannot rmdir '%s'", path);
  73}
  74
  75static int create_file(const char *path, unsigned int mode)
  76{
  77        mode = (mode & 0100) ? 0777 : 0666;
  78        return open(path, O_WRONLY | O_CREAT | O_EXCL, mode);
  79}
  80
  81static void *read_blob_entry(struct cache_entry *ce, unsigned long *size)
  82{
  83        enum object_type type;
  84        void *new = read_sha1_file(ce->sha1, &type, size);
  85
  86        if (new) {
  87                if (type == OBJ_BLOB)
  88                        return new;
  89                free(new);
  90        }
  91        return NULL;
  92}
  93
  94static int write_entry(struct cache_entry *ce, char *path, const struct checkout *state, int to_tempfile)
  95{
  96        unsigned int ce_mode_s_ifmt = ce->ce_mode & S_IFMT;
  97        int fd, ret, fstat_done = 0;
  98        char *new;
  99        struct strbuf buf = STRBUF_INIT;
 100        unsigned long size;
 101        size_t wrote, newsize = 0;
 102        struct stat st;
 103
 104        switch (ce_mode_s_ifmt) {
 105        case S_IFREG:
 106        case S_IFLNK:
 107                new = read_blob_entry(ce, &size);
 108                if (!new)
 109                        return error("git checkout-index: unable to read sha1 file of %s (%s)",
 110                                path, sha1_to_hex(ce->sha1));
 111
 112                if (ce_mode_s_ifmt == S_IFLNK && has_symlinks && !to_tempfile) {
 113                        ret = symlink(new, path);
 114                        free(new);
 115                        if (ret)
 116                                return error("git checkout-index: unable to create symlink %s (%s)",
 117                                             path, strerror(errno));
 118                        break;
 119                }
 120
 121                /*
 122                 * Convert from git internal format to working tree format
 123                 */
 124                if (ce_mode_s_ifmt == S_IFREG &&
 125                    convert_to_working_tree(ce->name, new, size, &buf)) {
 126                        free(new);
 127                        new = strbuf_detach(&buf, &newsize);
 128                        size = newsize;
 129                }
 130
 131                if (to_tempfile) {
 132                        if (ce_mode_s_ifmt == S_IFREG)
 133                                strcpy(path, ".merge_file_XXXXXX");
 134                        else
 135                                strcpy(path, ".merge_link_XXXXXX");
 136                        fd = mkstemp(path);
 137                } else if (ce_mode_s_ifmt == S_IFREG) {
 138                        fd = create_file(path, ce->ce_mode);
 139                } else {
 140                        fd = create_file(path, 0666);
 141                }
 142                if (fd < 0) {
 143                        free(new);
 144                        return error("git checkout-index: unable to create file %s (%s)",
 145                                path, strerror(errno));
 146                }
 147
 148                wrote = write_in_full(fd, new, size);
 149                /* use fstat() only when path == ce->name */
 150                if (fstat_is_reliable() &&
 151                    state->refresh_cache && !to_tempfile && !state->base_dir_len) {
 152                        fstat(fd, &st);
 153                        fstat_done = 1;
 154                }
 155                close(fd);
 156                free(new);
 157                if (wrote != size)
 158                        return error("git checkout-index: unable to write file %s", path);
 159                break;
 160        case S_IFGITLINK:
 161                if (to_tempfile)
 162                        return error("git checkout-index: cannot create temporary subproject %s", path);
 163                if (mkdir(path, 0777) < 0)
 164                        return error("git checkout-index: cannot create subproject directory %s", path);
 165                break;
 166        default:
 167                return error("git checkout-index: unknown file mode for %s", path);
 168        }
 169
 170        if (state->refresh_cache) {
 171                if (!fstat_done)
 172                        lstat(ce->name, &st);
 173                fill_stat_cache_info(ce, &st);
 174        }
 175        return 0;
 176}
 177
 178/*
 179 * This is like 'lstat()', except it refuses to follow symlinks
 180 * in the path, after skipping "skiplen".
 181 */
 182static int check_path(const char *path, int len, struct stat *st, int skiplen)
 183{
 184        const char *slash = path + len;
 185
 186        while (path < slash && *slash != '/')
 187                slash--;
 188        if (!has_dirs_only_path(path, slash - path, skiplen)) {
 189                errno = ENOENT;
 190                return -1;
 191        }
 192        return lstat(path, st);
 193}
 194
 195int checkout_entry(struct cache_entry *ce, const struct checkout *state, char *topath)
 196{
 197        static char path[PATH_MAX + 1];
 198        struct stat st;
 199        int len = state->base_dir_len;
 200
 201        if (topath)
 202                return write_entry(ce, topath, state, 1);
 203
 204        memcpy(path, state->base_dir, len);
 205        strcpy(path + len, ce->name);
 206        len += ce_namelen(ce);
 207
 208        if (!check_path(path, len, &st, state->base_dir_len)) {
 209                unsigned changed = ce_match_stat(ce, &st, CE_MATCH_IGNORE_VALID|CE_MATCH_IGNORE_SKIP_WORKTREE);
 210                if (!changed)
 211                        return 0;
 212                if (!state->force) {
 213                        if (!state->quiet)
 214                                fprintf(stderr, "git-checkout-index: %s already exists\n", path);
 215                        return -1;
 216                }
 217
 218                /*
 219                 * We unlink the old file, to get the new one with the
 220                 * right permissions (including umask, which is nasty
 221                 * to emulate by hand - much easier to let the system
 222                 * just do the right thing)
 223                 */
 224                if (S_ISDIR(st.st_mode)) {
 225                        /* If it is a gitlink, leave it alone! */
 226                        if (S_ISGITLINK(ce->ce_mode))
 227                                return 0;
 228                        if (!state->force)
 229                                return error("%s is a directory", path);
 230                        remove_subtree(path);
 231                } else if (unlink(path))
 232                        return error("unable to unlink old '%s' (%s)", path, strerror(errno));
 233        } else if (state->not_new)
 234                return 0;
 235        create_directories(path, len, state);
 236        return write_entry(ce, path, state, 0);
 237}