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                         return WIMLIB_ERR_LINK;
  90                 if (unlink(newpath))
  91                         return WIMLIB_ERR_LINK;
  92                 if ((*makelink)(oldpath, newpath))
  93                         return WIMLIB_ERR_LINK;
  94         }
  95         return 0;
  96 }
  97 static int
  98 unix_create_hardlink(const tchar *oldpath, const tchar *newpath,
  99                      struct apply_ctx *ctx)
 100 {
 101         return unix_makelink(oldpath, newpath, link);
 102 }
 103
 104 static int
 105 unix_create_symlink(const tchar *oldpath, const tchar *newpath,
 106                     struct apply_ctx *ctx)
 107 {
 108         return unix_makelink(oldpath, newpath, symlink);
 109 }
 110
 111 static int
 112 unix_extract_unnamed_stream(file_spec_t file,
 113                             struct wim_lookup_table_entry *lte,
 114                             struct apply_ctx *ctx)
 115 {
 116         const char *path = file.path;
 117         struct filedes fd;
 118         int raw_fd;
 119         int ret;
 120
 121         raw_fd = open(path, O_WRONLY | O_TRUNC);
 122         if (raw_fd < 0)
 123                 return WIMLIB_ERR_OPEN;
 124         filedes_init(&fd, raw_fd);
 125         ret = extract_wim_resource_to_fd(lte, &fd, wim_resource_size(lte));
 126         if (filedes_close(&fd) && !ret)
 127                 ret = WIMLIB_ERR_WRITE;
 128         return ret;
 129 }
 130
 131 static int
 132 unix_set_unix_data(const tchar *path, const struct wimlib_unix_data *data,
 133                    struct apply_ctx *ctx)
 134 {
 135         struct stat stbuf;
 136
 137         if (lstat(path, &stbuf))
 138                 return WIMLIB_ERR_SET_SECURITY;
 139         if (!S_ISLNK(stbuf.st_mode))
 140                 if (chmod(path, data->mode))
 141                         return WIMLIB_ERR_SET_SECURITY;
 142         if (lchown(path, data->uid, data->gid))
 143                 return WIMLIB_ERR_SET_SECURITY;
 144         return 0;
 145 }
 146
 147 static int
 148 unix_set_timestamps(const tchar *path, u64 creation_time, u64 last_write_time,
 149                     u64 last_access_time, struct apply_ctx *ctx)
 150 {
 151         int ret;
 152
 153 #ifdef HAVE_UTIMENSAT
 154         /* Convert the WIM timestamps, which are accurate to 100 nanoseconds,
 155          * into `struct timespec's for passing to utimensat(), which is accurate
 156          * to 1 nanosecond. */
 157
 158         struct timespec ts[2];
 159         ts[0] = wim_timestamp_to_timespec(last_access_time);
 160         ts[1] = wim_timestamp_to_timespec(last_write_time);
 161         ret = utimensat(AT_FDCWD, path, ts, AT_SYMLINK_NOFOLLOW);
 162         if (ret)
 163                 ret = errno;
 164 #else
 165         ret = ENOSYS;
 166 #endif
 167
 168         if (ret == ENOSYS) {
 169                 /* utimensat() not implemented or not available */
 170         #ifdef HAVE_LUTIMES
 171                 /* Convert the WIM timestamps, which are accurate to 100
 172                  * nanoseconds, into `struct timeval's for passing to lutimes(),
 173                  * which is accurate to 1 microsecond. */
 174                 struct timeval tv[2];
 175                 tv[0] = wim_timestamp_to_timeval(last_access_time);
 176                 tv[1] = wim_timestamp_to_timeval(last_write_time);
 177                 ret = lutimes(path, tv);
 178                 if (ret)
 179                         ret = errno;
 180         #endif
 181         }
 182
 183         if (ret == ENOSYS) {
 184                 /* utimensat() and lutimes() both not implemented or not
 185                  * available */
 186         #ifdef HAVE_UTIME
 187                 /* Convert the WIM timestamps, which are accurate to 100
 188                  * nanoseconds, into a `struct utimbuf's for passing to
 189                  * utime(), which is accurate to 1 second. */
 190                 struct utimbuf buf;
 191                 buf.actime = wim_timestamp_to_unix(last_access_time);
 192                 buf.modtime = wim_timestamp_to_unix(last_write_time);
 193                 ret = utime(path, &buf);
 194         #endif
 195         }
 196         if (ret)
 197                 return WIMLIB_ERR_SET_TIMESTAMPS;
 198         return 0;
 199 }
 200
 201 const struct apply_operations unix_apply_ops = {
 202         .name = "UNIX",
 203
 204         .start_extract          = unix_start_extract,
 205         .create_file            = unix_create_file,
 206         .create_directory       = unix_create_directory,
 207         .create_hardlink        = unix_create_hardlink,
 208         .create_symlink         = unix_create_symlink,
 209         .extract_unnamed_stream = unix_extract_unnamed_stream,
 210         .set_unix_data          = unix_set_unix_data,
 211         .set_timestamps         = unix_set_timestamps,
 212
 213         .path_separator = '/',
 214         .path_max = PATH_MAX,
 215
 216         .requires_target_in_paths = 1,
 217         .supports_case_sensitive_filenames = 1,
 218 };
 219
 220 #endif /* !__WIN32__ */