entry.c

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