entry.c

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