Re: Fwd: [Gluster-devel] glusterfs_1.4.0qa19: small issues

[Brent A Nelson]

On Wed, 18 Jun 2008, Brent A Nelson wrote:

> Any ideas on the two cp -a and rsync issues I reported earlier in this thread 
> (cp -a fails to preserve directory permissions, both fail to preserve setuid 
> bit)? Once those are out of the way, rsync and cp -a should be able to make 
> perfect copies on a GlusterFS.

I believe I've narrowed down the setuid issue to a glitch in hardlink 
handling.  It was happening in the case of /usr/bin/sudoedit apparently 
because sudoedit is a hardlink to sudo.  When cp -a does the hardlink, it 
wipes out the setuid bit.  I'm fairly certain this is what's happening, as 
I tried the cp -a with a bin directory that had sudo removed, and 
GlusterFS happily preserved the setuid bit.  Try again with sudo present, 
it fails.  Try again with sudo and sudoedit not being hardlinks, and it 
works!

Is anyone having any luck with "cp -a"'s inability to preserve directory 
permissions? In case it helps, here's an strace snippet from "cp -a blah 
/beast" where blah is an empty directory, mode 755, and /beast is my 
GlusterFS:

stat64("/beast", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
lstat64("blah", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
lstat64("/beast/blah", 0xbfca01ec)      = -1 ENOENT (No such file or 
directory)
mkdir("/beast/blah", 0700)              = 0
lstat64("/beast/blah", {st_mode=S_IFDIR|0700, st_size=4096, ...}) = 0
open("blah", O_RDONLY|O_NONBLOCK|O_LARGEFILE|O_DIRECTORY|0x80000) = 3
fstat64(3, {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
fcntl64(3, F_GETFD)                     = 0x1 (flags FD_CLOEXEC)
getdents64(3, /* 2 entries */, 4096)    = 48
getdents64(3, /* 0 entries */, 4096)    = 0
close(3)                                = 0
futimesat(AT_FDCWD, "/beast/blah", {1214261897, 0}) = 0
lchown32("/beast/blah", 0, 0)           = 0
getxattr("blah", "system.posix_acl_access", 0xbfc9fe50, 132) = -1 
EOPNOTSUPP (Operation not supported)
setxattr("/beast/blah", "system.posix_acl_access", 
"\x02\x00\x00\x00\x01\x00\x07\x00\xff\xff\xff\xff\x04\x00\x05\x00\xff\xff\xff\xff 
\x00\x05\x00\xff\xff\xff\xff", 28, 0) = 0
removexattr("/beast/blah", "system.posix_acl_default") = 0
close(0)                                = 0
close(1)                                = 0
close(2)                                = 0
exit_group(0)                           = ?

The original directory was mode 755, while the copy is 700.

Thanks,

Brent