bug#25378: cp does not preserve SElinx context of sub folder

[HE Henry]

Hi coreutils team,

When using cp with --parents options, the SELinux context of sub folders are 
not preserved.

Example as below:

1. Before using cp:
address@hidden etc]# pwd
/etc
address@hidden etc]# ls -Z selinux/
-rw-r--r--. root root system_u:object_r:selinux_config_t:s0 config
-rw-r--r--. root root system_u:object_r:selinux_config_t:s0 semanage.conf
drwxr-xr-x. root root system_u:object_r:selinux_config_t:s0 targeted
address@hidden etc]#  ls -Z -d selinux/
drwxr-xr-x. root root system_u:object_r:selinux_config_t:s0 selinux/


2. Using cp to copy /etc/selinux/targeted/seusers with full path to /tmp
address@hidden etc]# cp -r --preserve=context --parents 
selinux/targeted/seusers  /tmp

3. After using cp, the SELinux context of sub folder are changed, like selinux, 
targeted 

address@hidden etc]# ls -Z /tmp/selinux/
drwx------. root root unconfined_u:object_r:user_tmp_t:s0 targeted
address@hidden etc]# ls -Z -d /tmp/selinux/
drwx------. root root unconfined_u:object_r:user_tmp_t:s0 /tmp/selinux/
address@hidden etc]# ls -Z -d /tmp/selinux/targeted/
drwx------. root root unconfined_u:object_r:user_tmp_t:s0 /tmp/selinux/targeted/
address@hidden etc]# ls -Z /tmp/selinux/targeted/   
-rw-------. root root system_u:object_r:selinux_config_t:s0 seusers

Thanks,
Henry