systemd

Documentation

Index

• func DetectUID() (int, error)
• func DetectUserDbusSessionBusAddress() (string, error)
• func ExpandSlice(slice string) (string, error)
• func IsRunningSystemd() bool
• func NewLegacyManager(cg *configs.Cgroup, paths map[string]string) (cgroups.Manager, error)
• func NewUnifiedManager(config *configs.Cgroup, path string) (cgroups.Manager, error)
• func RangeToBits(str string) ([]byte, error)

Functions

func DetectUID

func DetectUID() (int, error)

DetectUID detects UID from the OwnerUID field of `busctl --user status` if running in userNS. The value corresponds to sd_bus_creds_get_owner_uid(3) .

Otherwise returns os.Getuid() .

func DetectUserDbusSessionBusAddress

func DetectUserDbusSessionBusAddress() (string, error)

DetectUserDbusSessionBusAddress returns $DBUS_SESSION_BUS_ADDRESS if set. Otherwise returns "unix:path=$XDG_RUNTIME_DIR/bus" if $XDG_RUNTIME_DIR/bus exists. Otherwise parses the value from `systemctl --user show-environment` .

func ExpandSlice

func ExpandSlice(slice string) (string, error)

systemd represents slice hierarchy using `-`, so we need to follow suit when generating the path of slice. Essentially, test-a-b.slice becomes /test.slice/test-a.slice/test-a-b.slice.

func IsRunningSystemd

func IsRunningSystemd() bool

NOTE: This function comes from package github.com/coreos/go-systemd/util It was borrowed here to avoid a dependency on cgo.

IsRunningSystemd checks whether the host was booted with systemd as its init system. This functions similarly to systemd's `sd_booted(3)`: internally, it checks whether /run/systemd/system/ exists and is a directory. http://www.freedesktop.org/software/systemd/man/sd_booted.html

func NewLegacyManager

func NewLegacyManager(cg *configs.Cgroup, paths map[string]string) (cgroups.Manager, error)

func NewUnifiedManager

func NewUnifiedManager(config *configs.Cgroup, path string) (cgroups.Manager, error)

func RangeToBits

func RangeToBits(str string) ([]byte, error)

RangeToBits converts a text representation of a CPU mask (as written to or read from cgroups' cpuset.* files, e.g. "1,3-5") to a slice of bytes with the corresponding bits set (as consumed by systemd over dbus as AllowedCPUs/AllowedMemoryNodes unit property value).