CopyDir recursively copies a directory tree, attempting to preserve permissions.

CopyFile copies the contents of the file named src to the file named by dst.

This is to enter process' mount namespace and get the passwd file.

try to get sym link.

Container's socket tables are located at /proc/[rootPid]/root/proc/1/net/ inode is unique and handle either only one service.

get the file information, if the file is a symlink, return both the symlink and the real file.

Get ppid, group and session id from /proc/<pid>/stat Error if ppid is -1.

Get the process parent id and uid from /proc/<pid>/status Error if ppid is -1.

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