Documentation
¶
Overview ¶
Package mount defines an interface to mounting filesystems.
TODO(thockin): This whole pkg is pretty linux-centric. As soon as we have an alternate platform, we will need to abstract further.
Index ¶
- Constants
- func GetDeviceNameFromMount(mounter Interface, mountPath string) (string, int, error)
- func GetMountRefs(mounter Interface, mountPath string) ([]string, error)
- func GetMountRefsByDev(mounter Interface, mountPath string) ([]string, error)
- func IsNotMountPoint(mounter Interface, file string) (bool, error)
- type Exec
- type FakeAction
- type FakeExec
- type FakeMounter
- func (f *FakeMounter) DeviceOpened(pathname string) (bool, error)
- func (f *FakeMounter) GetDeviceNameFromMount(mountPath, pluginDir string) (string, error)
- func (f *FakeMounter) IsLikelyNotMountPoint(file string) (bool, error)
- func (f *FakeMounter) IsMountPointMatch(mp MountPoint, dir string) bool
- func (f *FakeMounter) IsNotMountPoint(dir string) (bool, error)
- func (f *FakeMounter) List() ([]MountPoint, error)
- func (f *FakeMounter) Mount(source string, target string, fstype string, options []string) error
- func (f *FakeMounter) PathIsDevice(pathname string) (bool, error)
- func (f *FakeMounter) ResetLog()
- func (f *FakeMounter) Unmount(target string) error
- type Interface
- type MountPoint
- type Mounter
- func (mounter *Mounter) DeviceOpened(pathname string) (bool, error)
- func (mounter *Mounter) GetDeviceNameFromMount(mountPath, pluginDir string) (string, error)
- func (mounter *Mounter) IsLikelyNotMountPoint(file string) (bool, error)
- func (mounter *Mounter) IsMountPointMatch(mp MountPoint, dir string) bool
- func (mounter *Mounter) IsNotMountPoint(dir string) (bool, error)
- func (*Mounter) List() ([]MountPoint, error)
- func (mounter *Mounter) Mount(source string, target string, fstype string, options []string) error
- func (mounter *Mounter) PathIsDevice(pathname string) (bool, error)
- func (mounter *Mounter) Unmount(target string) error
- type NsenterMounter
- func (n *NsenterMounter) DeviceOpened(pathname string) (bool, error)
- func (n *NsenterMounter) GetDeviceNameFromMount(mountPath, pluginDir string) (string, error)
- func (n *NsenterMounter) IsLikelyNotMountPoint(file string) (bool, error)
- func (*NsenterMounter) IsMountPointMatch(mp MountPoint, dir string) bool
- func (m *NsenterMounter) IsNotMountPoint(dir string) (bool, error)
- func (*NsenterMounter) List() ([]MountPoint, error)
- func (n *NsenterMounter) Mount(source string, target string, fstype string, options []string) error
- func (n *NsenterMounter) PathIsDevice(pathname string) (bool, error)
- func (n *NsenterMounter) Unmount(target string) error
- type SafeFormatAndMount
Constants ¶
const FakeActionMount = "mount"
Values for FakeAction.Action
const FakeActionUnmount = "unmount"
const (
MountsInGlobalPDPath = "mounts"
)
Variables ¶
This section is empty.
Functions ¶
func GetDeviceNameFromMount ¶ added in v0.15.0
GetDeviceNameFromMount: given a mnt point, find the device from /proc/mounts returns the device name, reference count, and error code
func GetMountRefs ¶ added in v0.13.0
GetMountRefs finds all other references to the device referenced by mountPath; returns a list of paths.
func GetMountRefsByDev ¶ added in v1.8.0
GetMountRefsByDev finds all references to the device provided by mountPath; returns a list of paths.
func IsNotMountPoint ¶ added in v1.4.6
IsNotMountPoint determines if a directory is a mountpoint. It should return ErrNotExist when the directory does not exist. This method uses the List() of all mountpoints It is more extensive than IsLikelyNotMountPoint and it detects bind mounts in linux
Types ¶
type Exec ¶ added in v1.8.0
type Exec interface { // Run executes a command and returns its stdout + stderr combined in one // stream. Run(cmd string, args ...string) ([]byte, error) }
Exec executes command where mount utilities are. This can be either the host, container where kubelet runs or even a remote pod with mount utilities. Usual pkg/util/exec interface is not used because kubelet.RunInContainer does not provide stdin/stdout/stderr streams.
type FakeAction ¶ added in v0.13.1
type FakeAction struct { Action string // "mount" or "unmount" Target string // applies to both mount and unmount actions Source string // applies only to "mount" actions FSType string // applies only to "mount" actions }
FakeAction objects are logged every time a fake mount or unmount is called.
type FakeExec ¶ added in v1.8.0
type FakeExec struct {
// contains filtered or unexported fields
}
Fake for testing.
func NewFakeExec ¶ added in v1.8.0
func NewFakeExec(run runHook) *FakeExec
type FakeMounter ¶ added in v0.13.0
type FakeMounter struct { MountPoints []MountPoint Log []FakeAction // contains filtered or unexported fields }
FakeMounter implements mount.Interface for tests.
func (*FakeMounter) DeviceOpened ¶ added in v1.4.1
func (f *FakeMounter) DeviceOpened(pathname string) (bool, error)
func (*FakeMounter) GetDeviceNameFromMount ¶ added in v1.3.6
func (f *FakeMounter) GetDeviceNameFromMount(mountPath, pluginDir string) (string, error)
func (*FakeMounter) IsLikelyNotMountPoint ¶ added in v1.1.0
func (f *FakeMounter) IsLikelyNotMountPoint(file string) (bool, error)
func (*FakeMounter) IsMountPointMatch ¶ added in v1.7.2
func (f *FakeMounter) IsMountPointMatch(mp MountPoint, dir string) bool
func (*FakeMounter) IsNotMountPoint ¶ added in v1.7.2
func (f *FakeMounter) IsNotMountPoint(dir string) (bool, error)
func (*FakeMounter) List ¶ added in v0.13.0
func (f *FakeMounter) List() ([]MountPoint, error)
func (*FakeMounter) PathIsDevice ¶ added in v1.4.1
func (f *FakeMounter) PathIsDevice(pathname string) (bool, error)
func (*FakeMounter) ResetLog ¶ added in v0.13.1
func (f *FakeMounter) ResetLog()
func (*FakeMounter) Unmount ¶ added in v0.13.0
func (f *FakeMounter) Unmount(target string) error
type Interface ¶
type Interface interface { // Mount mounts source to target as fstype with given options. Mount(source string, target string, fstype string, options []string) error // Unmount unmounts given target. Unmount(target string) error // List returns a list of all mounted filesystems. This can be large. // On some platforms, reading mounts is not guaranteed consistent (i.e. // it could change between chunked reads). This is guaranteed to be // consistent. List() ([]MountPoint, error) // IsMountPointMatch determines if the mountpoint matches the dir IsMountPointMatch(mp MountPoint, dir string) bool // IsNotMountPoint determines if a directory is a mountpoint. // It should return ErrNotExist when the directory does not exist. // IsNotMountPoint is more expensive than IsLikelyNotMountPoint. // IsNotMountPoint detects bind mounts in linux. // IsNotMountPoint enumerates all the mountpoints using List() and // the list of mountpoints may be large, then it uses // IsMountPointMatch to evaluate whether the directory is a mountpoint IsNotMountPoint(file string) (bool, error) // IsLikelyNotMountPoint uses heuristics to determine if a directory // is a mountpoint. // It should return ErrNotExist when the directory does not exist. // IsLikelyNotMountPoint does NOT properly detect all mountpoint types // most notably linux bind mounts. IsLikelyNotMountPoint(file string) (bool, error) // DeviceOpened determines if the device is in use elsewhere // on the system, i.e. still mounted. DeviceOpened(pathname string) (bool, error) // PathIsDevice determines if a path is a device. PathIsDevice(pathname string) (bool, error) // GetDeviceNameFromMount finds the device name by checking the mount path // to get the global mount path which matches its plugin directory GetDeviceNameFromMount(mountPath, pluginDir string) (string, error) }
type MountPoint ¶
This represents a single line in /proc/mounts or /etc/fstab.
type Mounter ¶ added in v0.10.0
type Mounter struct {
// contains filtered or unexported fields
}
Mounter provides the default implementation of mount.Interface for the linux platform. This implementation assumes that the kubelet is running in the host's root mount namespace.
func (*Mounter) DeviceOpened ¶ added in v1.4.1
DeviceOpened checks if block device in use by calling Open with O_EXCL flag. If pathname is not a device, log and return false with nil error. If open returns errno EBUSY, return true with nil error. If open returns nil, return false with nil error. Otherwise, return false with error
func (*Mounter) GetDeviceNameFromMount ¶ added in v1.3.6
GetDeviceNameFromMount: given a mount point, find the device name from its global mount point
func (*Mounter) IsLikelyNotMountPoint ¶ added in v1.1.0
IsLikelyNotMountPoint determines if a directory is not a mountpoint. It is fast but not necessarily ALWAYS correct. If the path is in fact a bind mount from one part of a mount to another it will not be detected. mkdir /tmp/a /tmp/b; mount --bin /tmp/a /tmp/b; IsLikelyNotMountPoint("/tmp/b") will return true. When in fact /tmp/b is a mount point. If this situation if of interest to you, don't use this function...
func (*Mounter) IsMountPointMatch ¶ added in v1.7.2
func (mounter *Mounter) IsMountPointMatch(mp MountPoint, dir string) bool
func (*Mounter) IsNotMountPoint ¶ added in v1.7.2
func (*Mounter) List ¶ added in v0.10.0
func (*Mounter) List() ([]MountPoint, error)
List returns a list of all mounted filesystems.
func (*Mounter) Mount ¶ added in v0.10.0
Mount mounts source to target as fstype with given options. 'source' and 'fstype' must be an emtpy string in case it's not required, e.g. for remount, or for auto filesystem type, where kernel handles fs type for you. The mount 'options' is a list of options, currently come from mount(8), e.g. "ro", "remount", "bind", etc. If no more option is required, call Mount with an empty string list or nil.
func (*Mounter) PathIsDevice ¶ added in v1.4.1
PathIsDevice uses FileInfo returned from os.Stat to check if path refers to a device.
type NsenterMounter ¶ added in v0.17.0
type NsenterMounter struct {
// contains filtered or unexported fields
}
NsenterMounter is part of experimental support for running the kubelet in a container. Currently, all docker containers receive their own mount namespaces. NsenterMounter works by executing nsenter to run commands in the host's mount namespace.
NsenterMounter requires:
- Docker >= 1.6 due to the dependency on the slave propagation mode of the bind-mount of the kubelet root directory in the container. Docker 1.5 used a private propagation mode for bind-mounts, so mounts performed in the host's mount namespace do not propagate out to the bind-mount in this docker version.
- The host's root filesystem must be available at /rootfs
- The nsenter binary must be on the Kubelet process' PATH in the container's filesystem.
- The Kubelet process must have CAP_SYS_ADMIN (required by nsenter); at the present, this effectively means that the kubelet is running in a privileged container.
- The volume path used by the Kubelet must be the same inside and outside the container and be writable by the container (to initialize volume) contents. TODO: remove this requirement.
- The host image must have mount, findmnt, and umount binaries in /bin, /usr/sbin, or /usr/bin
- The host image should have systemd-run in /bin, /usr/sbin, or /usr/bin
For more information about mount propagation modes, see:
https://www.kernel.org/doc/Documentation/filesystems/sharedsubtree.txt
func NewNsenterMounter ¶ added in v1.0.6
func NewNsenterMounter() *NsenterMounter
func (*NsenterMounter) DeviceOpened ¶ added in v1.4.1
func (n *NsenterMounter) DeviceOpened(pathname string) (bool, error)
DeviceOpened checks if block device in use by calling Open with O_EXCL flag. Returns true if open returns errno EBUSY, and false if errno is nil. Returns an error if errno is any error other than EBUSY. Returns with error if pathname is not a device.
func (*NsenterMounter) GetDeviceNameFromMount ¶ added in v1.3.6
func (n *NsenterMounter) GetDeviceNameFromMount(mountPath, pluginDir string) (string, error)
GetDeviceNameFromMount given a mount point, find the volume id from checking /proc/mounts
func (*NsenterMounter) IsLikelyNotMountPoint ¶ added in v1.1.0
func (n *NsenterMounter) IsLikelyNotMountPoint(file string) (bool, error)
IsLikelyNotMountPoint determines whether a path is a mountpoint by calling findmnt in the host's root mount namespace.
func (*NsenterMounter) IsMountPointMatch ¶ added in v1.7.2
func (*NsenterMounter) IsMountPointMatch(mp MountPoint, dir string) bool
func (*NsenterMounter) IsNotMountPoint ¶ added in v1.7.2
func (m *NsenterMounter) IsNotMountPoint(dir string) (bool, error)
func (*NsenterMounter) List ¶ added in v0.17.0
func (*NsenterMounter) List() ([]MountPoint, error)
List returns a list of all mounted filesystems in the host's mount namespace.
func (*NsenterMounter) Mount ¶ added in v0.17.0
Mount runs mount(8) in the host's root mount namespace. Aside from this aspect, Mount has the same semantics as the mounter returned by mount.New()
func (*NsenterMounter) PathIsDevice ¶ added in v1.4.1
func (n *NsenterMounter) PathIsDevice(pathname string) (bool, error)
PathIsDevice uses FileInfo returned from os.Stat to check if path refers to a device.
func (*NsenterMounter) Unmount ¶ added in v0.17.0
func (n *NsenterMounter) Unmount(target string) error
Unmount runs umount(8) in the host's mount namespace.
type SafeFormatAndMount ¶ added in v1.1.0
SafeFormatAndMount probes a device to see if it is formatted. Namely it checks to see if a file system is present. If so it mounts it otherwise the device is formatted first then mounted.
func (*SafeFormatAndMount) FormatAndMount ¶ added in v1.2.0
func (mounter *SafeFormatAndMount) FormatAndMount(source string, target string, fstype string, options []string) error
FormatAndMount formats the given disk, if needed, and mounts it. That is if the disk is not formatted and it is not being mounted as read-only it will format it first then mount it. Otherwise, if the disk is already formatted or it is being mounted as read-only, it will be mounted without formatting.