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         enum object_type type;
  72
  73         new = read_sha1_file(ce->sha1, &type, &size);
  74         if (!new || type != OBJ_BLOB) {
  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                 char *buf;
  82                 unsigned long nsize;
  83
  84         case S_IFREG:
  85                 if (to_tempfile) {
  86                         strcpy(path, ".merge_file_XXXXXX");
  87                         fd = mkstemp(path);
  88                 } else
  89                         fd = create_file(path, ntohl(ce->ce_mode));
  90                 if (fd < 0) {
  91                         free(new);
  92                         return error("git-checkout-index: unable to create file %s (%s)",
  93                                 path, strerror(errno));
  94                 }
  95
  96                 /*
  97                  * Convert from git internal format to working tree format
  98                  */
  99                 buf = new;
 100                 nsize = size;
 101                 if (convert_to_working_tree(ce->name, &buf, &nsize)) {
 102                         free(new);
 103                         new = buf;
 104                         size = nsize;
 105                 }
 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", path);
 112                 break;
 113         case S_IFLNK:
 114                 if (to_tempfile || !has_symlinks) {
 115                         if (to_tempfile) {
 116                                 strcpy(path, ".merge_link_XXXXXX");
 117                                 fd = mkstemp(path);
 118                         } else
 119                                 fd = create_file(path, 0666);
 120                         if (fd < 0) {
 121                                 free(new);
 122                                 return error("git-checkout-index: unable to create "
 123                                                  "file %s (%s)", path, strerror(errno));
 124                         }
 125                         wrote = write_in_full(fd, new, size);
 126                         close(fd);
 127                         free(new);
 128                         if (wrote != size)
 129                                 return error("git-checkout-index: unable to write file %s",
 130                                         path);
 131                 } else {
 132                         wrote = symlink(new, path);
 133                         free(new);
 134                         if (wrote)
 135                                 return error("git-checkout-index: unable to create "
 136                                                  "symlink %s (%s)", path, strerror(errno));
 137                 }
 138                 break;
 139         default:
 140                 free(new);
 141                 return error("git-checkout-index: unknown file mode for %s", path);
 142         }
 143
 144         if (state->refresh_cache) {
 145                 struct stat st;
 146                 lstat(ce->name, &st);
 147                 fill_stat_cache_info(ce, &st);
 148         }
 149         return 0;
 150 }
 151
 152 int checkout_entry(struct cache_entry *ce, struct checkout *state, char *topath)
 153 {
 154         static char path[PATH_MAX + 1];
 155         struct stat st;
 156         int len = state->base_dir_len;
 157
 158         if (topath)
 159                 return write_entry(ce, topath, state, 1);
 160
 161         memcpy(path, state->base_dir, len);
 162         strcpy(path + len, ce->name);
 163
 164         if (!lstat(path, &st)) {
 165                 unsigned changed = ce_match_stat(ce, &st, 1);
 166                 if (!changed)
 167                         return 0;
 168                 if (!state->force) {
 169                         if (!state->quiet)
 170                                 fprintf(stderr, "git-checkout-index: %s already exists\n", path);
 171                         return -1;
 172                 }
 173
 174                 /*
 175                  * We unlink the old file, to get the new one with the
 176                  * right permissions (including umask, which is nasty
 177                  * to emulate by hand - much easier to let the system
 178                  * just do the right thing)
 179                  */
 180                 unlink(path);
 181                 if (S_ISDIR(st.st_mode)) {
 182                         if (!state->force)
 183                                 return error("%s is a directory", path);
 184                         remove_subtree(path);
 185                 }
 186         } else if (state->not_new)
 187                 return 0;
 188         create_directories(path, state);
 189         return write_entry(ce, path, state, 0);
 190 }