entry.c

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