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 int write_entry(struct cache_entry *ce, char *path, struct checkout *state, int to_tempfile)
  66 {
  67         int fd;
  68         void *new;
  69         unsigned long size;
  70         long wrote;
  71         char type[20];
  72
  73         new = read_sha1_file(ce->sha1, type, &size);
  74         if (!new || strcmp(type, blob_type)) {
  75                 if (new)
  76                         free(new);
  77                 return error("git-checkout-index: unable to read sha1 file of %s (%s)",
  78                         path, sha1_to_hex(ce->sha1));
  79         }
  80         switch (ntohl(ce->ce_mode) & S_IFMT) {
  81         case S_IFREG:
  82                 if (to_tempfile) {
  83                         strcpy(path, ".merge_file_XXXXXX");
  84                         fd = mkstemp(path);
  85                 } else
  86                         fd = create_file(path, ntohl(ce->ce_mode));
  87                 if (fd < 0) {
  88                         free(new);
  89                         return error("git-checkout-index: unable to create file %s (%s)",
  90                                 path, strerror(errno));
  91                 }
  92                 wrote = write_in_full(fd, new, size);
  93                 close(fd);
  94                 free(new);
  95                 if (wrote != size)
  96                         return error("git-checkout-index: unable to write file %s", path);
  97                 break;
  98         case S_IFLNK:
  99                 if (to_tempfile) {
 100                         strcpy(path, ".merge_link_XXXXXX");
 101                         fd = mkstemp(path);
 102                         if (fd < 0) {
 103                                 free(new);
 104                                 return error("git-checkout-index: unable to create "
 105                                                  "file %s (%s)", path, strerror(errno));
 106                         }
 107                         wrote = write_in_full(fd, new, size);
 108                         close(fd);
 109                         free(new);
 110                         if (wrote != size)
 111                                 return error("git-checkout-index: unable to write file %s",
 112                                         path);
 113                 } else {
 114                         wrote = symlink(new, path);
 115                         free(new);
 116                         if (wrote)
 117                                 return error("git-checkout-index: unable to create "
 118                                                  "symlink %s (%s)", path, strerror(errno));
 119                 }
 120                 break;
 121         default:
 122                 free(new);
 123                 return error("git-checkout-index: unknown file mode for %s", path);
 124         }
 125
 126         if (state->refresh_cache) {
 127                 struct stat st;
 128                 lstat(ce->name, &st);
 129                 fill_stat_cache_info(ce, &st);
 130         }
 131         return 0;
 132 }
 133
 134 int checkout_entry(struct cache_entry *ce, struct checkout *state, char *topath)
 135 {
 136         static char path[PATH_MAX + 1];
 137         struct stat st;
 138         int len = state->base_dir_len;
 139
 140         if (topath)
 141                 return write_entry(ce, topath, state, 1);
 142
 143         memcpy(path, state->base_dir, len);
 144         strcpy(path + len, ce->name);
 145
 146         if (!lstat(path, &st)) {
 147                 unsigned changed = ce_match_stat(ce, &st, 1);
 148                 if (!changed)
 149                         return 0;
 150                 if (!state->force) {
 151                         if (!state->quiet)
 152                                 fprintf(stderr, "git-checkout-index: %s already exists\n", path);
 153                         return -1;
 154                 }
 155
 156                 /*
 157                  * We unlink the old file, to get the new one with the
 158                  * right permissions (including umask, which is nasty
 159                  * to emulate by hand - much easier to let the system
 160                  * just do the right thing)
 161                  */
 162                 unlink(path);
 163                 if (S_ISDIR(st.st_mode)) {
 164                         if (!state->force)
 165                                 return error("%s is a directory", path);
 166                         remove_subtree(path);
 167                 }
 168         } else if (state->not_new)
 169                 return 0;
 170         create_directories(path, state);
 171         return write_entry(ce, path, state, 0);
 172 }