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, int force)
  61{
  62        int fd;
  63
  64        mode = (mode & 0100) ? 0777 : 0666;
  65        fd = open(path, O_WRONLY | O_TRUNC | O_CREAT | O_EXCL, mode);
  66        if (fd < 0) {
  67                if (errno == EISDIR && force) {
  68                        remove_subtree(path);
  69                        fd = open(path, O_WRONLY | O_TRUNC | O_CREAT | O_EXCL, mode);
  70                }
  71        }
  72        return fd;
  73}
  74
  75static int write_entry(struct cache_entry *ce, const char *path, struct checkout *state)
  76{
  77        int fd;
  78        void *new;
  79        unsigned long size;
  80        long wrote;
  81        char type[20];
  82        char target[1024];
  83
  84        new = read_sha1_file(ce->sha1, type, &size);
  85        if (!new || strcmp(type, "blob")) {
  86                if (new)
  87                        free(new);
  88                return error("git-checkout-cache: unable to read sha1 file of %s (%s)",
  89                        path, sha1_to_hex(ce->sha1));
  90        }
  91        switch (ntohl(ce->ce_mode) & S_IFMT) {
  92        case S_IFREG:
  93                fd = create_file(path, ntohl(ce->ce_mode), state->force);
  94                if (fd < 0) {
  95                        free(new);
  96                        return error("git-checkout-cache: unable to create file %s (%s)",
  97                                path, strerror(errno));
  98                }
  99                wrote = write(fd, new, size);
 100                close(fd);
 101                free(new);
 102                if (wrote != size)
 103                        return error("git-checkout-cache: unable to write file %s", path);
 104                break;
 105        case S_IFLNK:
 106                memcpy(target, new, size);
 107                target[size] = '\0';
 108                if (symlink(target, path)) {
 109                        free(new);
 110                        return error("git-checkout-cache: unable to create symlink %s (%s)",
 111                                path, strerror(errno));
 112                }
 113                free(new);
 114                break;
 115        default:
 116                free(new);
 117                return error("git-checkout-cache: unknown file mode for %s", path);
 118        }
 119
 120        if (state->refresh_cache) {
 121                struct stat st;
 122                lstat(ce->name, &st);
 123                fill_stat_cache_info(ce, &st);
 124        }
 125        return 0;
 126}
 127
 128int checkout_entry(struct cache_entry *ce, struct checkout *state)
 129{
 130        struct stat st;
 131        static char path[MAXPATHLEN+1];
 132        int len = state->base_dir_len;
 133
 134        memcpy(path, state->base_dir, len);
 135        strcpy(path + len, ce->name);
 136
 137        if (!lstat(path, &st)) {
 138                unsigned changed = ce_match_stat(ce, &st);
 139                if (!changed)
 140                        return 0;
 141                if (!state->force) {
 142                        if (!state->quiet)
 143                                fprintf(stderr, "git-checkout-cache: %s already exists\n", path);
 144                        return 0;
 145                }
 146
 147                /*
 148                 * We unlink the old file, to get the new one with the
 149                 * right permissions (including umask, which is nasty
 150                 * to emulate by hand - much easier to let the system
 151                 * just do the right thing)
 152                 */
 153                unlink(path);
 154        } else if (state->not_new) 
 155                return 0;
 156        create_directories(path, state);
 157        return write_entry(ce, path, state);
 158}
 159
 160