'configparser' is backported to python2 and can
be installed using pip (pip install configparser).
So trying to import 'configparser' first and later
'ConfigParser' can cause issues w.r.t unicode strings.

Always try importing 'ConfigParser' first and then
'configparser'. This solves python2/python3 compat
issues.

Change-Id: I2a87c3fc46476296b8cb547338f35723518751cc
fixes: bz#1671637
Signed-off-by: Kotresh HR <khiremat@redhat.com>

Problem: When geo-rep is configured as hybrid crawl
         directory renames are not synced to the slave.

Solution: Rename sync of directory was failing due to incorrect
          destination path calculation.
          During check for existence on slave we miscalculated
          realpath. <host:brickpath/dir>.

Change-Id: I23f1ea60e86a917598fe869d5d24f8da654d8a0a
fixes: bz#1665826
Signed-off-by: Sunny Kumar <sunkumar@redhat.com>

Problem:
  Creation of files/directories with non-ascii names fails
  to sync to the slave. It crashes with below traceback on
  slave.
  ...
  File "/usr/lib/x86_64-linux-gnu/glusterfs/python/syncdaemon/repce.py", line 118, in worker
    res = getattr(self.obj, rmeth)(*in_data[2:])
  File "/usr/lib/x86_64-linux-gnu/glusterfs/python/syncdaemon/resource.py", line 709, in entry_ops
    [ESTALE, EINVAL, EBUSY])
  File "/usr/lib/x86_64-linux-gnu/glusterfs/python/syncdaemon/syncdutils.py", line 546, in errno_wrap
    return call(*arg)
  File "/usr/lib/x86_64-linux-gnu/glusterfs/python/syncdaemon/libcxattr.py", line 83, in lsetxattr
    cls.raise_oserr()
  File "/usr/lib/x86_64-linux-gnu/glusterfs/python/syncdaemon/libcxattr.py", line 38, in raise_oserr
    raise OSError(errn, os.strerror(errn))
  OSError: [Errno 12] Cannot allocate memory

Cause:
  The length calculation arguments passed to blob creation was done before encoding. Hence
  was failing in gfid-access layer.

Fix:
  It appears that the calculating lenght properly fixes this issue. But it will cause
  issues in other places in 'python2' and not in 'python3'. So encoding and decoding
  each required string to make geo-rep compatible with both 'python2' and 'python3'
  is a nightmare and is not fool proof. Hence kept 'python2' code as is with out
  encode/decode and applied encode/decode only to 'python3'

Added non-ascii filename tests to regression

fixes: bz#1650893
Change-Id: I35cfaf848e07b1a0b5cb93c01b98b472f08271a6
Signed-off-by: Kotresh HR <khiremat@redhat.com>

While syncing metadata, 'os.chmod', 'os.chown',
'os.utime' should be used without de-reference.
But python supports only 'os.chown' without
de-reference. That's mostly because Linux
doesn't support 'chmod' on symlink file itself
but it does support 'chown'.

So while syncing metadata ops, if it's symlink
we should only sync 'chown' and not do 'chmod'
and 'utime'. It will lead to tracebacks with
errors like EROFS, EPERM, ACCESS, ENOENT.
All the three errors (EPERM, ACCESS, ENOENT)
were handled except EROFS. But the way it was
handled was not fool proof. The operation is
tried and failure was handled based on the errors.
All the errors with symlink file for 'chown',
'utime' had to be passed to safe errors list of
'errno_wrap'. This patch handles it better by
avoiding 'chmod' and 'utime' if it's symlink
file.

fixes: bz#1646104
Change-Id: Ic354206455cdc7ab2a87d741d81f4efe1f19d77d
Signed-off-by: Kotresh HR <khiremat@redhat.com>

Geo-rep's automatic error handling does gfid conflict
resolution. But if there are ENOENT errors because the
parent is not synced to slave, it doesn' handle them.
This patch adds the intelligence to create missing
parent directories on slave. It can create the missing
directories upto the depth of 10.

fixes: bz#1643402
Change-Id: Ic97ed1fa5899c087e404d559e04f7963ed7bb54c
Signed-off-by: Kotresh HR <khiremat@redhat.com>

1. scheduler - Popen
2. syncdutils - corner case on failure

fixes: bz#1643932
Change-Id: I65af97a244a8790e976acedc2728db6ebbf2ae10
Signed-off-by: Kotresh HR <khiremat@redhat.com>

Problem:
During gfid-conflict-resolution, geo-rep crashes
with 'ValueError: list.remove(x): x not in list'

Cause and Analysis:
During gfid-conflict-resolution, the entry blob is
passed back to master along with additional
information to verify it's integrity. If everything
looks fine, the entry creation is ignored and is
deleted from the original list.  But it is crashing
during removal of entry from the list saying entry
not in list. The reason is that the stat information
in the entry blob was modified and sent back to
master if present.

Fix:
Send back the correct stat information for
gfid-conflict-resolution.

fixes: bz#1642865
Change-Id: I47a6aa60b2a495465aa9314eebcb4085f0b1c4fd
Signed-off-by: Kotresh HR <khiremat@redhat.com>

1. ctypes/syscalls
    A) arguments is expected to be encoded
    B) Raw conversion of return value from bytearray into string
2. struct pack/unpack - Raw converstion of string to bytearray
3. basestring -> str

Updates: #411
Change-Id: I80f939adcdec0ed0022c87c0b76d057ad5559e5a
Signed-off-by: Kotresh HR <khiremat@redhat.com>

Some of the scripts that have a #!/usr/bin/python3 shebang do not have a
main() like function. These scripts will not get executed but only
imported. They do not need the shebang.

A few others are not installed with 'make install', but do have a main()
like function. These scripts are expected to be used by developers for
different tasks (mostly code generation). Marking these scripts
executable to make it easier to identify them.

Change-Id: I73541471deb7e0830766b804786244e73dfe4221
Updates: #411
Signed-off-by: Niels de Vos <ndevos@redhat.com>

Handle py2 and py3 compatibility for pickling and unpickling.
Geo-rep pickles and unpickles reading sys.stdin and sys.stdout streams.
py2 and py3 compatibility expects the streams to be opened in binary 
mode but the sys.stdout objects are different in python2
and python3

python2:
>>> type(sys.stdout)
<type 'file'>

python3:
>>> type(sys.stdout)
<class '_io.TextIOWrapper'>

So in order to access binary stream, using sys.stdin.buffer in python3

Updates: #411
Change-Id: I1a633ccdddff5baf0cf05a8b493add39ddf75bd7
Signed-off-by: Kotresh HR <khiremat@redhat.com>