What do?

rewrite uids, gids, usernames, and groupnames inside of tar streams

Usage

Create a new tarball

cat tarball.tar | chowntar [options] > new-tarball.tar

Extract to the filesystem

cat tarball.tar | chowntar [options] | tar -vx

Multiple rewrites

cat tarball.tar | chowntar [options] | chowntar [options] | chowntar [options]

Options

Usage of ./chowntar:
  -from-gid int
    	Rewrite GID from GID
  -from-group string
    	Rewrite groupname FROM groupname
  -from-uid int
    	Rewrite UID from UID
  -from-user string
    	Rewrite username FROM username
  -to-gid int
    	Rewrite this GID to GID
  -to-group string
    	Rewrite groupname FROM groupname
  -to-uid int
    	Rewrite UID to  UID
  -to-user string
    	Rewrite username FROM username
  -verbose
    	Be verbose about changes