entry.c

   1 #include <sys/types.h>
   2 #include <dirent.h>
   3 #include "cache.h"
   4 #include "blob.h"
   5
   6 static void create_directories(const char *path, struct checkout *state)
   7 {
   8         int len = strlen(path);
   9         char *buf = xmalloc(len + 1);
  10         const char *slash = path;
  11
  12         while ((slash = strchr(slash+1, '/')) != NULL) {
  13                 len = slash - path;
  14                 memcpy(buf, path, len);
  15                 buf[len] = 0;
  16                 if (mkdir(buf, 0777)) {
  17                         if (errno == EEXIST) {
  18                                 struct stat st;
  19                                 if (len > state->base_dir_len && state->force && !unlink(buf) && !mkdir(buf, 0777))
  20                                         continue;
  21                                 if (!stat(buf, &st) && S_ISDIR(st.st_mode))
  22                                         continue; /* ok */
  23                         }
  24                         die("cannot create directory at %s", buf);
  25                 }
  26         }
  27         free(buf);
  28 }
  29
  30 static void remove_subtree(const char *path)
  31 {
  32         DIR *dir = opendir(path);
  33         struct dirent *de;
  34         char pathbuf[PATH_MAX];
  35         char *name;
  36
  37         if (!dir)
  38                 die("cannot opendir %s", path);
  39         strcpy(pathbuf, path);
  40         name = pathbuf + strlen(path);
  41         *name++ = '/';
  42         while ((de = readdir(dir)) != NULL) {
  43                 struct stat st;
  44                 if ((de->d_name[0] == '.') &&
  45                     ((de->d_name[1] == 0) ||
  46                      ((de->d_name[1] == '.') && de->d_name[2] == 0)))
  47                         continue;
  48                 strcpy(name, de->d_name);
  49                 if (lstat(pathbuf, &st))
  50                         die("cannot lstat %s", pathbuf);
  51                 if (S_ISDIR(st.st_mode))
  52                         remove_subtree(pathbuf);
  53                 else if (unlink(pathbuf))
  54                         die("cannot unlink %s", pathbuf);
  55         }
  56         closedir(dir);
  57         if (rmdir(path))
  58                 die("cannot rmdir %s", path);
  59 }
  60
  61 static int create_file(const char *path, unsigned int mode)
  62 {
  63         mode = (mode & 0100) ? 0777 : 0666;
  64         return open(path, O_WRONLY | O_CREAT | O_EXCL, mode);
  65 }
  66
  67 static int write_entry(struct cache_entry *ce, char *path, struct checkout *state, int to_tempfile)
  68 {
  69         int fd;
  70         void *new;
  71         unsigned long size;
  72         long wrote;
  73         char type[20];
  74
  75         new = read_sha1_file(ce->sha1, type, &size);
  76         if (!new || strcmp(type, blob_type)) {
  77                 if (new)
  78                         free(new);
  79                 return error("git-checkout-index: unable to read sha1 file of %s (%s)",
  80                         path, sha1_to_hex(ce->sha1));
  81         }
  82         switch (ntohl(ce->ce_mode) & S_IFMT) {
  83         case S_IFREG:
  84                 if (to_tempfile) {
  85                         strcpy(path, ".merge_file_XXXXXX");
  86                         fd = mkstemp(path);
  87                 } else
  88                         fd = create_file(path, ntohl(ce->ce_mode));
  89                 if (fd < 0) {
  90                         free(new);
  91                         return error("git-checkout-index: unable to create file %s (%s)",
  92                                 path, strerror(errno));
  93                 }
  94                 wrote = write(fd, new, size);
  95                 close(fd);
  96                 free(new);
  97                 if (wrote != size)
  98                         return error("git-checkout-index: unable to write file %s", path);
  99                 break;
 100         case S_IFLNK:
 101                 if (to_tempfile) {
 102                         strcpy(path, ".merge_link_XXXXXX");
 103                         fd = mkstemp(path);
 104                         if (fd < 0) {
 105                                 free(new);
 106                                 return error("git-checkout-index: unable to create "
 107                                                  "file %s (%s)", path, strerror(errno));
 108                         }
 109                         wrote = write(fd, new, size);
 110                         close(fd);
 111                         free(new);
 112                         if (wrote != size)
 113                                 return error("git-checkout-index: unable to write file %s",
 114                                         path);
 115                 } else {
 116                         wrote = symlink(new, path);
 117                         free(new);
 118                         if (wrote)
 119                                 return error("git-checkout-index: unable to create "
 120                                                  "symlink %s (%s)", path, strerror(errno));
 121                 }
 122                 break;
 123         default:
 124                 free(new);
 125                 return error("git-checkout-index: unknown file mode for %s", path);
 126         }
 127
 128         if (state->refresh_cache) {
 129                 struct stat st;
 130                 lstat(ce->name, &st);
 131                 fill_stat_cache_info(ce, &st);
 132         }
 133         return 0;
 134 }
 135
 136 int checkout_entry(struct cache_entry *ce, struct checkout *state, char *topath)
 137 {
 138         static char path[PATH_MAX + 1];
 139         struct stat st;
 140         int len = state->base_dir_len;
 141
 142         if (topath)
 143                 return write_entry(ce, topath, state, 1);
 144
 145         memcpy(path, state->base_dir, len);
 146         strcpy(path + len, ce->name);
 147
 148         if (!lstat(path, &st)) {
 149                 unsigned changed = ce_match_stat(ce, &st, 1);
 150                 if (!changed)
 151                         return 0;
 152                 if (!state->force) {
 153                         if (!state->quiet)
 154                                 fprintf(stderr, "git-checkout-index: %s already exists\n", path);
 155                         return -1;
 156                 }
 157
 158                 /*
 159                  * We unlink the old file, to get the new one with the
 160                  * right permissions (including umask, which is nasty
 161                  * to emulate by hand - much easier to let the system
 162                  * just do the right thing)
 163                  */
 164                 unlink(path);
 165                 if (S_ISDIR(st.st_mode)) {
 166                         if (!state->force)
 167                                 return error("%s is a directory", path);
 168                         remove_subtree(path);
 169                 }
 170         } else if (state->not_new)
 171                 return 0;
 172         create_directories(path, state);
 173         return write_entry(ce, path, state, 0);
 174 }