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From:	"Chris January" <chris AT atomice DOT net>
To:	"Cygwin AT Cygwin DOT Com" <cygwin AT cygwin DOT com>
Subject:	problem with chroot causing Cygwin to get confused about the root directory
Date:	Sun, 1 Dec 2002 17:44:56 -0000
Message-ID:	<LPEHIHGCJOAIPFLADJAHIELFDBAA.chris@atomice.net>
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I'm having a problem with chroot - see the following strace:

CYGWIN_NT-5.1 AVOCADO 1.3.17(0.67/3/2) 2002-11-27 18:54 i686 unknown
   63   60329 [main] linexec 2652 normalize_posix_path: src .
   61   60390 [main] linexec 2652 cwdstuff::get: posix
/home/chris/line/rootfs
   55   60445 [main] linexec 2652 cwdstuff::get: (/home/chris/line/rootfs) =
cwdstuff::get (0x22F880, 260, 1, 0), errno 9
   57   60502 [main] linexec 2652 normalize_posix_path:
/home/chris/line/rootfs = normalize_posix_path (.)
   58   60560 [main] linexec 2652 mount_info::conv_to_win32_path:
conv_to_win32_path (/home/chris/line/rootfs)
   69   60629 [main] linexec 2652 set_flags: flags: binary (0x2)
   74   60703 [main] linexec 2652 mount_info::conv_to_win32_path: src_path
/home/chris/line/rootfs, dst C:\cygwin\home\chris\line\rootfs, flags 0xA, rc
0
  731   61434 [main] linexec 2652 symlink_info::check: not a symlink
  115   61549 [main] linexec 2652 symlink_info::check: 0 = symlink.check
(C:\cygwin\home\chris\line\rootfs, 0x22F540) (0xA)
   63   61612 [main] linexec 2652 mount_info::conv_to_win32_path:
conv_to_win32_path (/home/chris/line)
   65   61677 [main] linexec 2652 set_flags: flags: binary (0x2)
   55   61732 [main] linexec 2652 mount_info::conv_to_win32_path: src_path
/home/chris/line, dst C:\cygwin\home\chris\line, flags 0xA, rc 0
  301   62033 [main] linexec 2652 symlink_info::check: not a symlink
   77   62110 [main] linexec 2652 symlink_info::check: 0 = symlink.check
(C:\cygwin\home\chris\line, 0x22F540) (0xA)
   61   62171 [main] linexec 2652 mount_info::conv_to_win32_path:
conv_to_win32_path (/home/chris)
   62   62233 [main] linexec 2652 set_flags: flags: binary (0x2)
   56   62289 [main] linexec 2652 mount_info::conv_to_win32_path: src_path
/home/chris, dst C:\cygwin\home\chris, flags 0xA, rc 0
  271   62560 [main] linexec 2652 symlink_info::check: not a symlink
   75   62635 [main] linexec 2652 symlink_info::check: 0 = symlink.check
(C:\cygwin\home\chris, 0x22F540) (0xA)
   60   62695 [main] linexec 2652 mount_info::conv_to_win32_path:
conv_to_win32_path (/home)
   62   62757 [main] linexec 2652 set_flags: flags: binary (0x2)
   56   62813 [main] linexec 2652 mount_info::conv_to_win32_path: src_path
/home, dst C:\cygwin\home, flags 0xA, rc 0
  836   63649 [main] linexec 2652 symlink_info::check: not a symlink
  152   63801 [main] linexec 2652 symlink_info::check: 0 = symlink.check
(C:\cygwin\home, 0x22F540) (0xA)
   69   63870 [main] linexec 2652 path_conv::check: root_dir(C:\),
this->path(C:\cygwin\home\chris\line\rootfs), set_has_acls(8)
   65   63935 [main] linexec 2652 chroot: 0 = chroot (.)
   65   64000 [main] linexec 2652 chdir: dir '/'
   57   64057 [main] linexec 2652 normalize_posix_path: src /
   57   64114 [main] linexec 2652 normalize_posix_path: / =
normalize_posix_path (/)
   56   64170 [main] linexec 2652 mount_info::conv_to_win32_path:
conv_to_win32_path (/)
   66   64236 [main] linexec 2652 set_flags: flags: binary (0x2)
   55   64291 [main] linexec 2652 mount_info::conv_to_win32_path: src_path
/, dst C:\cygwin\home\chris\line\rootfs, flags 0xA, rc 0
  554   64845 [main] linexec 2652 symlink_info::check: not a symlink
   96   64941 [main] linexec 2652 symlink_info::check: 0 = symlink.check
(C:\cygwin\home\chris\line\rootfs, 0x22F520) (0xA)
   62   65003 [main] linexec 2652 path_conv::check: root_dir(C:\),
this->path(C:\cygwin\home\chris\line\rootfs), set_has_acls(8)
   71   65074 [main] linexec 2652 mount_info::conv_to_posix_path:
conv_to_posix_path (C:\cygwin\home\chris\line\rootfs, no-keep-rel,
no-add-slash)
   63   65137 [main] linexec 2652 normalize_win32_path:
C:\cygwin\home\chris\line\rootfs = normalize_win32_path
(C:\cygwin\home\chris\line\rootfs)
   66   65203 [main] linexec 2652 mount_info::conv_to_posix_path:
/cygdrive/c/cygwin/home/chris/line/rootfs = conv_to_posix_path
(C:\cygwin\home\chris\line\rootfs)
   61   65264 [main] linexec 2652 chdir: 0 = chdir() cygheap->cwd.posix
'/cygdrive/c/cygwin/home/chris/line/rootfs' native
'C:\cygwin\home\chris\line\rootfs'

At the start of the strace chroot (".") has been called; it succeeds at time
63935. (The same problem occurs with chroot(<full path to rootfs>) as well).
Then chdir ("/") is called at time 64000. The result of conv_to_posix_path
at time 2652 should be '/', but is instead /cygdrive/c/...
I'll look at the Cygwin source, but has anyone else any ideas as I suspect
it may take me some time to track this down.

Chris


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