idtools

Documentation

Index

• func AddNamespaceRangesUser(name string) (int, int, error)
• func CanAccess(path string, pair Identity) bool
• func GetRootUIDGID(uidMap, gidMap []IDMap) (int, int, error)
• func LookupGID(gid int) (user.Group, error)
• func LookupGroup(name string) (user.Group, error)
• func LookupUID(uid int) (user.User, error)
• func LookupUser(name string) (user.User, error)
• func MkdirAllAndChown(path string, mode os.FileMode, owner Identity) error
• func MkdirAllAndChownNew(path string, mode os.FileMode, owner Identity) error
• func MkdirAndChown(path string, mode os.FileMode, owner Identity) error
• type IDMap
• type Identity
  • func CurrentIdentity() Identity
  • func (id Identity) Chown(name string) error
• type IdentityMapping
  • func LoadIdentityMapping(name string) (IdentityMapping, error)
  • func (i IdentityMapping) Empty() bool
  • func (i IdentityMapping) RootPair() Identity
  • func (i IdentityMapping) ToContainer(pair Identity) (int, int, error)
  • func (i IdentityMapping) ToHost(pair Identity) (Identity, error)

Functions

func AddNamespaceRangesUser

func AddNamespaceRangesUser(name string) (int, int, error)

AddNamespaceRangesUser takes a username and uses the standard system utility to create a system user/group pair used to hold the /etc/sub{uid,gid} ranges which will be used for user namespace mapping ranges in containers.

func CanAccess

func CanAccess(path string, pair Identity) bool

CanAccess takes a valid (existing) directory and a uid, gid pair and determines if that uid, gid pair has access (execute bit) to the directory

func GetRootUIDGID

func GetRootUIDGID(uidMap, gidMap []IDMap) (int, int, error)

GetRootUIDGID retrieves the remapped root uid/gid pair from the set of maps. If the maps are empty, then the root uid/gid will default to "real" 0/0

func LookupGID

func LookupGID(gid int) (user.Group, error)

LookupGID uses traditional local system files lookup (from libcontainer/user) on a group ID, followed by a call to `getent` for supporting host configured non-files passwd and group dbs

func LookupGroup

func LookupGroup(name string) (user.Group, error)

LookupGroup uses traditional local system files lookup (from libcontainer/user) on a group name, followed by a call to `getent` for supporting host configured non-files passwd and group dbs

func LookupUID

func LookupUID(uid int) (user.User, error)

LookupUID uses traditional local system files lookup (from libcontainer/user) on a uid, followed by a call to `getent` for supporting host configured non-files passwd and group dbs

func LookupUser

func LookupUser(name string) (user.User, error)

LookupUser uses traditional local system files lookup (from libcontainer/user) on a username, followed by a call to `getent` for supporting host configured non-files passwd and group dbs

func MkdirAllAndChown

func MkdirAllAndChown(path string, mode os.FileMode, owner Identity) error

MkdirAllAndChown creates a directory (include any along the path) and then modifies ownership to the requested uid/gid. If the directory already exists, this function will still change ownership and permissions.

func MkdirAllAndChownNew

func MkdirAllAndChownNew(path string, mode os.FileMode, owner Identity) error

MkdirAllAndChownNew creates a directory (include any along the path) and then modifies ownership ONLY of newly created directories to the requested uid/gid. If the directories along the path exist, no change of ownership or permissions will be performed

func MkdirAndChown

func MkdirAndChown(path string, mode os.FileMode, owner Identity) error

MkdirAndChown creates a directory and then modifies ownership to the requested uid/gid. If the directory already exists, this function still changes ownership and permissions. Note that unlike os.Mkdir(), this function does not return IsExist error in case path already exists.

Types

type IDMap

type IDMap struct {
	ContainerID int `json:"container_id"`
	HostID      int `json:"host_id"`
	Size        int `json:"size"`
}

IDMap contains a single entry for user namespace range remapping. An array of IDMap entries represents the structure that will be provided to the Linux kernel for creating a user namespace.

type Identity

type Identity struct {
	UID int
	GID int
	SID string
}

Identity is either a UID and GID pair or a SID (but not both)

func CurrentIdentity

func CurrentIdentity() Identity

CurrentIdentity returns the identity of the current process

func (Identity) Chown

func (id Identity) Chown(name string) error

Chown changes the numeric uid and gid of the named file to id.UID and id.GID.

type IdentityMapping

type IdentityMapping struct {
	UIDMaps []IDMap `json:"UIDMaps"`
	GIDMaps []IDMap `json:"GIDMaps"`
}

IdentityMapping contains a mappings of UIDs and GIDs. The zero value represents an empty mapping.

func LoadIdentityMapping

func LoadIdentityMapping(name string) (IdentityMapping, error)

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

func (IdentityMapping) Empty

func (i IdentityMapping) Empty() bool

Empty returns true if there are no id mappings

func (IdentityMapping) RootPair

func (i IdentityMapping) RootPair() Identity

RootPair returns a uid and gid pair for the root user. The error is ignored because a root user always exists, and the defaults are correct when the uid and gid maps are empty.

func (IdentityMapping) ToContainer

func (i IdentityMapping) ToContainer(pair Identity) (int, int, error)

ToContainer returns the container UID and GID for the host uid and gid

func (IdentityMapping) ToHost

func (i IdentityMapping) ToHost(pair Identity) (Identity, error)

ToHost returns the host UID and GID for the container uid, gid. Remapping is only performed if the ids aren't already the remapped root ids