AddNamespaceRangesUser takes a name and finds an unused uid, gid pair and calls the appropriate helper function to add the group and then the user to the group in /etc/group and /etc/passwd respectively.

CreateIDMappings takes a requested user and group name and using the data from /etc/sub{uid,gid} ranges, creates the proper uid and gid remapping ranges for that user/group pair.

GetRootUIDGID retrieves the remapped root uid/gid pair from the set of maps.

MkdirAllAs creates a directory (include any along the path) and then modifies ownership to the requested uid/gid.

MkdirAllNewAs creates a directory (include any along the path) and then modifies ownership ONLY of newly created directories to the requested uid/gid.

MkdirAs creates a directory and then modifies ownership to the requested uid/gid.

ToContainer takes an id mapping, and uses it to translate a host ID to the remapped ID.

ToHost takes an id mapping and a remapped ID, and translates the ID to the mapped host ID.

IDMap contains a single entry for user namespace range remapping.