wimlib.net Git - wimlib/blob - src/unix_apply.c

   1 /*
   2  * unix_apply.c - Code to apply files from a WIM image on UNIX.
   3  */
   4
   5 /*
   6  * Copyright (C) 2012, 2013 Eric Biggers
   7  *
   8  * This file is part of wimlib, a library for working with WIM files.
   9  *
  10  * wimlib is free software; you can redistribute it and/or modify it under the
  11  * terms of the GNU General Public License as published by the Free
  12  * Software Foundation; either version 3 of the License, or (at your option)
  13  * any later version.
  14  *
  15  * wimlib is distributed in the hope that it will be useful, but WITHOUT ANY
  16  * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
  17  * A PARTICULAR PURPOSE. See the GNU General Public License for more
  18  * details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with wimlib; if not, see http://www.gnu.org/licenses/.
  22  */
  23
  24 #ifndef __WIN32__
  25
  26 #ifdef HAVE_CONFIG_H
  27 #  include "config.h"
  28 #endif
  29
  30 #include "wimlib/apply.h"
  31 #include "wimlib/error.h"
  32 #include "wimlib/lookup_table.h"
  33 #include "wimlib/resource.h"
  34 #include "wimlib/timestamp.h"
  35
  36 #include <errno.h>
  37 #include <fcntl.h>
  38 #include <limits.h>
  39 #include <sys/stat.h>
  40 #include <sys/types.h>
  41 #include <unistd.h>
  42
  43 #ifdef HAVE_UTIME_H
  44 #  include <utime.h>
  45 #endif
  46
  47 static int
  48 unix_start_extract(const char *target, struct apply_ctx *ctx)
  49 {
  50         ctx->supported_features.hard_links = 1;
  51         ctx->supported_features.symlink_reparse_points = 1;
  52         ctx->supported_features.unix_data = 1;
  53         return 0;
  54 }
  55
  56 static int
  57 unix_create_file(const char *path, struct apply_ctx *ctx, u64 *cookie_ret)
  58 {
  59         int fd = open(path, O_TRUNC | O_CREAT | O_WRONLY, 0644);
  60         if (fd < 0)
  61                 return WIMLIB_ERR_OPEN;
  62         close(fd);
  63         return 0;
  64 }
  65
  66 static int
  67 unix_create_directory(const tchar *path, struct apply_ctx *ctx, u64 *cookie_ret)
  68 {
  69         struct stat stbuf;
  70
  71         if (mkdir(path, 0755)) {
  72                 if (errno != EEXIST)
  73                         return WIMLIB_ERR_MKDIR;
  74                 if (lstat(path, &stbuf))
  75                         return WIMLIB_ERR_MKDIR;
  76                 errno = EEXIST;
  77                 if (!S_ISDIR(stbuf.st_mode))
  78                         return WIMLIB_ERR_MKDIR;
  79         }
  80         return 0;
  81 }
  82
  83 static int
  84 unix_makelink(const tchar *oldpath, const tchar *newpath,
  85               int (*makelink)(const tchar *oldpath, const tchar *newpath))
  86 {
  87         if ((*makelink)(oldpath, newpath)) {
  88                 if (errno == EEXIST) {
  89                         if (unlink(newpath))
  90                                 return WIMLIB_ERR_LINK;
  91                         if ((*makelink)(oldpath, newpath))
  92                                 return WIMLIB_ERR_LINK;
  93                         return 0;
  94                 }
  95                 return WIMLIB_ERR_LINK;
  96         }
  97         return 0;
  98 }
  99 static int
 100 unix_create_hardlink(const tchar *oldpath, const tchar *newpath,
 101                      struct apply_ctx *ctx)
 102 {
 103         return unix_makelink(oldpath, newpath, link);
 104 }
 105
 106 static int
 107 unix_create_symlink(const tchar *oldpath, const tchar *newpath,
 108                     struct apply_ctx *ctx)
 109 {
 110         return unix_makelink(oldpath, newpath, symlink);
 111 }
 112
 113 static int
 114 unix_extract_unnamed_stream(file_spec_t file,
 115                             struct wim_lookup_table_entry *lte,
 116                             struct apply_ctx *ctx)
 117 {
 118         const char *path = file.path;
 119         struct filedes fd;
 120         int raw_fd;
 121         int ret;
 122
 123         raw_fd = open(path, O_WRONLY | O_TRUNC);
 124         if (raw_fd < 0)
 125                 return WIMLIB_ERR_OPEN;
 126         filedes_init(&fd, raw_fd);
 127         ret = extract_wim_resource_to_fd(lte, &fd, wim_resource_size(lte));
 128         if (filedes_close(&fd) && !ret)
 129                 ret = WIMLIB_ERR_WRITE;
 130         return ret;
 131 }
 132
 133 static int
 134 unix_set_unix_data(const tchar *path, const struct wimlib_unix_data *data,
 135                    struct apply_ctx *ctx)
 136 {
 137         struct stat stbuf;
 138
 139         if (lstat(path, &stbuf))
 140                 return WIMLIB_ERR_SET_SECURITY;
 141         if (!S_ISLNK(stbuf.st_mode))
 142                 if (chmod(path, data->mode))
 143                         return WIMLIB_ERR_SET_SECURITY;
 144         if (lchown(path, data->uid, data->gid))
 145                 return WIMLIB_ERR_SET_SECURITY;
 146         return 0;
 147 }
 148
 149 static int
 150 unix_set_timestamps(const tchar *path, u64 creation_time, u64 last_write_time,
 151                     u64 last_access_time, struct apply_ctx *ctx)
 152 {
 153         int ret;
 154
 155 #ifdef HAVE_UTIMENSAT
 156         /* Convert the WIM timestamps, which are accurate to 100 nanoseconds,
 157          * into `struct timespec's for passing to utimensat(), which is accurate
 158          * to 1 nanosecond. */
 159
 160         struct timespec ts[2];
 161         ts[0] = wim_timestamp_to_timespec(last_access_time);
 162         ts[1] = wim_timestamp_to_timespec(last_write_time);
 163         ret = utimensat(AT_FDCWD, path, ts, AT_SYMLINK_NOFOLLOW);
 164         if (ret)
 165                 ret = errno;
 166 #else
 167         ret = ENOSYS;
 168 #endif
 169
 170         if (ret == ENOSYS) {
 171                 /* utimensat() not implemented or not available */
 172         #ifdef HAVE_LUTIMES
 173                 /* Convert the WIM timestamps, which are accurate to 100
 174                  * nanoseconds, into `struct timeval's for passing to lutimes(),
 175                  * which is accurate to 1 microsecond. */
 176                 struct timeval tv[2];
 177                 tv[0] = wim_timestamp_to_timeval(last_access_time);
 178                 tv[1] = wim_timestamp_to_timeval(last_write_time);
 179                 ret = lutimes(path, tv);
 180                 if (ret)
 181                         ret = errno;
 182         #endif
 183         }
 184
 185         if (ret == ENOSYS) {
 186                 /* utimensat() and lutimes() both not implemented or not
 187                  * available */
 188         #ifdef HAVE_UTIME
 189                 /* Convert the WIM timestamps, which are accurate to 100
 190                  * nanoseconds, into a `struct utimbuf's for passing to
 191                  * utime(), which is accurate to 1 second. */
 192                 struct utimbuf buf;
 193                 buf.actime = wim_timestamp_to_unix(last_access_time);
 194                 buf.modtime = wim_timestamp_to_unix(last_write_time);
 195                 ret = utime(path, &buf);
 196         #endif
 197         }
 198         if (ret)
 199                 return WIMLIB_ERR_SET_TIMESTAMPS;
 200         return 0;
 201 }
 202
 203 const struct apply_operations unix_apply_ops = {
 204         .name = "UNIX",
 205
 206         .start_extract          = unix_start_extract,
 207         .create_file            = unix_create_file,
 208         .create_directory       = unix_create_directory,
 209         .create_hardlink        = unix_create_hardlink,
 210         .create_symlink         = unix_create_symlink,
 211         .extract_unnamed_stream = unix_extract_unnamed_stream,
 212         .set_unix_data          = unix_set_unix_data,
 213         .set_timestamps         = unix_set_timestamps,
 214
 215         .path_separator = '/',
 216         .path_max = PATH_MAX,
 217
 218         .requires_target_in_paths = 1,
 219         .supports_case_sensitive_filenames = 1,
 220 };
 221
 222 #endif /* !__WIN32__ */