entry.c

   1 #include "cache.h"
   2 #include "blob.h"
   3
   4 static 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                 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 (%s)", path, strerror(errno));
  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 (%s)", pathbuf, strerror(errno));
  49                 if (S_ISDIR(st.st_mode))
  50                         remove_subtree(pathbuf);
  51                 else if (unlink(pathbuf))
  52                         die("cannot unlink %s (%s)", pathbuf, strerror(errno));
  53         }
  54         closedir(dir);
  55         if (rmdir(path))
  56                 die("cannot rmdir %s (%s)", path, strerror(errno));
  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, const 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;
  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 = convert_to_working_tree(ce->name, new, &size);
 107                 if (buf) {
 108                         free(new);
 109                         new = buf;
 110                 }
 111
 112                 wrote = write_in_full(fd, new, size);
 113                 close(fd);
 114                 free(new);
 115                 if (wrote != size)
 116                         return error("git-checkout-index: unable to write file %s", path);
 117                 break;
 118         case S_IFLNK:
 119                 new = read_blob_entry(ce, path, &size);
 120                 if (!new)
 121                         return error("git-checkout-index: unable to read sha1 file of %s (%s)",
 122                                 path, sha1_to_hex(ce->sha1));
 123                 if (to_tempfile || !has_symlinks) {
 124                         if (to_tempfile) {
 125                                 strcpy(path, ".merge_link_XXXXXX");
 126                                 fd = mkstemp(path);
 127                         } else
 128                                 fd = create_file(path, 0666);
 129                         if (fd < 0) {
 130                                 free(new);
 131                                 return error("git-checkout-index: unable to create "
 132                                                  "file %s (%s)", path, strerror(errno));
 133                         }
 134                         wrote = write_in_full(fd, new, size);
 135                         close(fd);
 136                         free(new);
 137                         if (wrote != size)
 138                                 return error("git-checkout-index: unable to write file %s",
 139                                         path);
 140                 } else {
 141                         wrote = symlink(new, path);
 142                         free(new);
 143                         if (wrote)
 144                                 return error("git-checkout-index: unable to create "
 145                                                  "symlink %s (%s)", path, strerror(errno));
 146                 }
 147                 break;
 148         case S_IFGITLINK:
 149                 if (to_tempfile)
 150                         return error("git-checkout-index: cannot create temporary subproject %s", path);
 151                 if (mkdir(path, 0777) < 0)
 152                         return error("git-checkout-index: cannot create subproject directory %s", path);
 153                 break;
 154         default:
 155                 return error("git-checkout-index: unknown file mode for %s", path);
 156         }
 157
 158         if (state->refresh_cache) {
 159                 struct stat st;
 160                 lstat(ce->name, &st);
 161                 fill_stat_cache_info(ce, &st);
 162         }
 163         return 0;
 164 }
 165
 166 int checkout_entry(struct cache_entry *ce, const struct checkout *state, char *topath)
 167 {
 168         static char path[PATH_MAX + 1];
 169         struct stat st;
 170         int len = state->base_dir_len;
 171
 172         if (topath)
 173                 return write_entry(ce, topath, state, 1);
 174
 175         memcpy(path, state->base_dir, len);
 176         strcpy(path + len, ce->name);
 177
 178         if (!lstat(path, &st)) {
 179                 unsigned changed = ce_match_stat(ce, &st, 1);
 180                 if (!changed)
 181                         return 0;
 182                 if (!state->force) {
 183                         if (!state->quiet)
 184                                 fprintf(stderr, "git-checkout-index: %s already exists\n", path);
 185                         return -1;
 186                 }
 187
 188                 /*
 189                  * We unlink the old file, to get the new one with the
 190                  * right permissions (including umask, which is nasty
 191                  * to emulate by hand - much easier to let the system
 192                  * just do the right thing)
 193                  */
 194                 unlink(path);
 195                 if (S_ISDIR(st.st_mode)) {
 196                         /* If it is a gitlink, leave it alone! */
 197                         if (S_ISGITLINK(ntohl(ce->ce_mode)))
 198                                 return 0;
 199                         if (!state->force)
 200                                 return error("%s is a directory", path);
 201                         remove_subtree(path);
 202                 }
 203         } else if (state->not_new)
 204                 return 0;
 205         create_directories(path, state);
 206         return write_entry(ce, path, state, 0);
 207 }