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From:	Lester Ingber <ingber AT alumni DOT caltech DOT edu>
Subject:	Re: untarring symlinks with ../ fails randomly
Date:	Mon, 25 Apr 2011 14:59:45 +0000 (UTC)
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Corinna Vinschen <corinna-cygwin <at> cygwin.com> writes:

> 
> On Apr 24 17:14, Dima Pasechnik wrote:
> > Dear all,
> > reposting, as the message did not get through to the mailing list yesterday:
> > 
> > The issue I have is exactly as described in
> > http://sourceware.org/ml/cygwin/2011-04/msg00299.html
> > I can reproduce this on a very similar Windows 7 host.
> > (To be precise, it seems hard to predict when creating symlinks fails;
> > I could say
> > that perhaps 20% of them, on average, are not created correctly (i.e.
> > I get files of size 0 instead)).
> 
> A simple testcase in plain C to reproduce the issue would be fine.
> Did you try to create the symlinks under strace?  It should contain
> some valuable hint from the function "symlink_worker".
> 
> Corinna
>

The problem seems to be with untar, not tar per se.  Just today, I did `tar cp` 
a directory of a few hundred links under Cygwin.  Under an unbuntu machine I 
recovered all files and links just fine.  Under Cygwin, all files were 0 and 
permissions were "----------" instead of "lrwxrwxrwx" as in the original 
directory.  (Yesterday, half the links were 0.  After compiling tar-12.6 from 
gnu.org I still got 8 0's.  I then moved that tar to tar-1.26 yesterday.)  I 
include an excerpt of the log of `tar xfp` doing this with strace just for one 
file, index.html.

 2510 1010065 [main] tar 7272 open: open (/home/ingber/www-ssl/index.html, 
0xA01)
  247 1010312 [main] tar 7272 normalize_posix_path: src /home/ingber/www-
ssl/index.html
   93 1010405 [main] tar 7272 normalize_posix_path: /home/ingber/www-
ssl/index.html = normalize_posix_path (/home/ingber/www-ssl/index.html)
  154 1010559 [main] tar 7272 mount_info::conv_to_win32_path: conv_to_win32_path 
(/home/ingber/www-ssl/index.html)
  262 1010821 [main] tar 7272 set_flags: flags: binary (0x2)
  152 1010973 [main] tar 7272 mount_info::conv_to_win32_path: src_path 
/home/ingber/www-ssl/index.html, dst C:\cygwin\home\ingber\www-ssl\index.html, 
flags 0x3000A, rc 0
  255 1011228 [main] tar 7272 symlink_info::check: 0xC0000034 = NtCreateFile 
(\??\C:\cygwin\home\ingber\www-ssl\index.html)
  197 1011425 [main] tar 7272 symlink_info::check: 0xC0000034 = 
NtQueryInformationFile (\??\C:\cygwin\home\ingber\www-ssl\index.html)
  280 1011705 [main] tar 7272 symlink_info::check: 0xC0000034 = NtCreateFile 
(\??\C:\cygwin\home\ingber\www-ssl\index.html.exe)
  205 1011910 [main] tar 7272 symlink_info::check: 0xC0000034 = 
NtQueryInformationFile (\??\C:\cygwin\home\ingber\www-ssl\index.html.exe)
  260 1012170 [main] tar 7272 symlink_info::check: 0xC0000034 = NtCreateFile 
(\??\C:\cygwin\home\ingber\www-ssl\index.html.lnk)
  162 1012332 [main] tar 7272 symlink_info::check: 0xC0000034 = 
NtQueryInformationFile (\??\C:\cygwin\home\ingber\www-ssl\index.html.lnk)
  262 1012594 [main] tar 7272 symlink_info::check: 0xC0000034 = NtCreateFile 
(\??\C:\cygwin\home\ingber\www-ssl\index.html.exe.lnk)
  199 1012793 [main] tar 7272 symlink_info::check: 0xC0000034 = 
NtQueryInformationFile (\??\C:\cygwin\home\ingber\www-ssl\index.html.exe.lnk)
  188 1012981 [main] tar 7272 symlink_info::check: 0 = symlink.check 
(C:\cygwin\home\ingber\www-ssl\index.html, 0x28B590) (0x3000A)
  241 1013222 [main] tar 7272 mount_info::conv_to_win32_path: conv_to_win32_path 
(/home/ingber/www-ssl)
  122 1013344 [main] tar 7272 set_flags: flags: binary (0x2)
  213 1013557 [main] tar 7272 mount_info::conv_to_win32_path: src_path 
/home/ingber/www-ssl, dst C:\cygwin\home\ingber\www-ssl, flags 0x3000A, rc 0
  243 1013800 [main] tar 7272 symlink_info::check: 0x0 = NtCreateFile (\??
\C:\cygwin\home\ingber\www-ssl)
  235 1014035 [main] tar 7272 symlink_info::check: not a symlink
  233 1014268 [main] tar 7272 symlink_info::check: 0 = symlink.check 
(C:\cygwin\home\ingber\www-ssl, 0x28B590) (0x3000A)
  110 1014378 [main] tar 7272 path_conv::check: this-
>path(C:\cygwin\home\ingber\www-ssl\index.html), has_acls(1)
  147 1014525 [main] tar 7272 build_fh_pc: fh 0x61244584
  305 1014830 [main] tar 7272 fhandler_base::open: (\??
\C:\cygwin\home\ingber\www-ssl\index.html, 0x100A01)
 1307 1016137 [main] tar 7272 alloc_sd: uid -1, gid -1, attribute 80000000
  196 1016333 [main] tar 7272 cygsid::debug_print: alloc_sd: owner SID = S-1-5-
21-2524525894-1771701056-721517013-1000 (+)
  215 1016548 [main] tar 7272 cygsid::debug_print: alloc_sd: group SID = S-1-5-
21-2524525894-1771701056-721517013-513 (+)
  217 1016765 [main] tar 7272 alloc_sd: ACL-Size: 100
  450 1017215 [main] tar 7272 alloc_sd: Created SD-Size: 176
  416 1017631 [main] tar 7272 set_file_attribute: 0 = set_file_attribute (\??
\C:\cygwin\home\ingber\www-ssl\index.html, -1, -1, 0x80000000)
  151 1017782 [main] tar 7272 fhandler_base::set_flags: flags 0x100A01, 
supplied_bin 0x10000
   72 1017854 [main] tar 7272 fhandler_base::set_flags: filemode set to binary
  115 1017969 [main] tar 7272 fhandler_base::open: 0 = NtCreateFile (0x198, 
40160080, \??\C:\cygwin\home\ingber\www-ssl\index.html, io, NULL, 80, 7, 2, 
4020, NULL, 0)
  147 1018116 [main] tar 7272 fhandler_base::open: 1 = fhandler_base::open (\??
\C:\cygwin\home\ingber\www-ssl\index.html, 0x100A01)
  403 1018519 [main] tar 7272 fhandler_base::open_fs: 1 = 
fhandler_disk_file::open (\??\C:\cygwin\home\ingber\www-ssl\index.html, 0xA01)
  202 1018721 [main] tar 7272 open: 4 = open (/home/ingber/www-ssl/index.html, 
0xA01)
  425 1019146 [main] tar 7272 cygpsid::debug_print: get_sids_info: owner SID = 
S-1-5-21-2524525894-1771701056-721517013-1000
  190 1019336 [main] tar 7272 cygpsid::debug_print: get_sids_info: group SID = 
S-1-5-21-2524525894-1771701056-721517013-513
  204 1019540 [main] tar 7272 get_info_from_sd: ACL 0, uid 1000, gid 513
  335 1019875 [main] tar 7272 fhandler_base::fstat_helper: 0 = fstat (\??
\C:\cygwin\home\ingber\www-ssl\index.html, 0x28CB28) st_atime=4DB58943 
st_size=0, st_mode=0x8000, st_ino=11540474045393930, sizeof=96
  179 1020054 [main] tar 7272 fstat64: 0 = fstat (4, 0x28CB28)
  202 1020256 [main] tar 7272 close: close (4)
  154 1020410 [main] tar 7272 fhandler_base::close: closing '/home/ingber/www-
ssl/index.html' handle 0x198






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