Andrew's git - gitweb.git/blob

   1#include <sys/types.h>
   2#include <dirent.h>
   3#include "cache.h"
   4
   5static 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
  29static 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
  60static 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
  66static int write_entry(struct cache_entry *ce, const char *path, struct checkout *state)
  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                fd = create_file(path, ntohl(ce->ce_mode));
  84                if (fd < 0) {
  85                        free(new);
  86                        return error("git-checkout-index: unable to create file %s (%s)",
  87                                path, strerror(errno));
  88                }
  89                wrote = write(fd, new, size);
  90                close(fd);
  91                free(new);
  92                if (wrote != size)
  93                        return error("git-checkout-index: unable to write file %s", path);
  94                break;
  95        case S_IFLNK:
  96                if (symlink(new, path)) {
  97                        free(new);
  98                        return error("git-checkout-index: unable to create "
  99                                     "symlink %s (%s)", path, strerror(errno));
 100                }
 101                free(new);
 102                break;
 103        default:
 104                free(new);
 105                return error("git-checkout-index: unknown file mode for %s", path);
 106        }
 107
 108        if (state->refresh_cache) {
 109                struct stat st;
 110                lstat(ce->name, &st);
 111                fill_stat_cache_info(ce, &st);
 112        }
 113        return 0;
 114}
 115
 116int checkout_entry(struct cache_entry *ce, struct checkout *state)
 117{
 118        struct stat st;
 119        static char path[MAXPATHLEN+1];
 120        int len = state->base_dir_len;
 121
 122        memcpy(path, state->base_dir, len);
 123        strcpy(path + len, ce->name);
 124
 125        if (!lstat(path, &st)) {
 126                unsigned changed = ce_match_stat(ce, &st);
 127                if (!changed)
 128                        return 0;
 129                if (!state->force) {
 130                        if (!state->quiet)
 131                                fprintf(stderr, "git-checkout-index: %s already exists\n", path);
 132                        return -1;
 133                }
 134
 135                /*
 136                 * We unlink the old file, to get the new one with the
 137                 * right permissions (including umask, which is nasty
 138                 * to emulate by hand - much easier to let the system
 139                 * just do the right thing)
 140                 */
 141                unlink(path);
 142                if (S_ISDIR(st.st_mode)) {
 143                        if (!state->force)
 144                                return error("%s is a directory", path);
 145                        remove_subtree(path);
 146                }
 147        } else if (state->not_new) 
 148                return 0;
 149        create_directories(path, state);
 150        return write_entry(ce, path, state);
 151}
 152
 153