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