130 lines
3.6 KiB
Go
130 lines
3.6 KiB
Go
package graphdriver // import "github.com/docker/docker/daemon/graphdriver"
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import (
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"github.com/moby/sys/mountinfo"
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"golang.org/x/sys/unix"
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)
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const (
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// FsMagicAufs filesystem id for Aufs
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FsMagicAufs = FsMagic(0x61756673)
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// FsMagicBtrfs filesystem id for Btrfs
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FsMagicBtrfs = FsMagic(0x9123683E)
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// FsMagicCramfs filesystem id for Cramfs
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FsMagicCramfs = FsMagic(0x28cd3d45)
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// FsMagicEcryptfs filesystem id for eCryptfs
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FsMagicEcryptfs = FsMagic(0xf15f)
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// FsMagicExtfs filesystem id for Extfs
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FsMagicExtfs = FsMagic(0x0000EF53)
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// FsMagicF2fs filesystem id for F2fs
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FsMagicF2fs = FsMagic(0xF2F52010)
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// FsMagicGPFS filesystem id for GPFS
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FsMagicGPFS = FsMagic(0x47504653)
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// FsMagicJffs2Fs filesystem if for Jffs2Fs
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FsMagicJffs2Fs = FsMagic(0x000072b6)
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// FsMagicJfs filesystem id for Jfs
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FsMagicJfs = FsMagic(0x3153464a)
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// FsMagicNfsFs filesystem id for NfsFs
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FsMagicNfsFs = FsMagic(0x00006969)
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// FsMagicRAMFs filesystem id for RamFs
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FsMagicRAMFs = FsMagic(0x858458f6)
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// FsMagicReiserFs filesystem id for ReiserFs
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FsMagicReiserFs = FsMagic(0x52654973)
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// FsMagicSmbFs filesystem id for SmbFs
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FsMagicSmbFs = FsMagic(0x0000517B)
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// FsMagicSquashFs filesystem id for SquashFs
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FsMagicSquashFs = FsMagic(0x73717368)
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// FsMagicTmpFs filesystem id for TmpFs
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FsMagicTmpFs = FsMagic(0x01021994)
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// FsMagicVxFS filesystem id for VxFs
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FsMagicVxFS = FsMagic(0xa501fcf5)
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// FsMagicXfs filesystem id for Xfs
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FsMagicXfs = FsMagic(0x58465342)
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// FsMagicZfs filesystem id for Zfs
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FsMagicZfs = FsMagic(0x2fc12fc1)
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// FsMagicOverlay filesystem id for overlay
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FsMagicOverlay = FsMagic(0x794C7630)
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// FsMagicFUSE filesystem id for FUSE
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FsMagicFUSE = FsMagic(0x65735546)
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)
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var (
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// List of drivers that should be used in an order
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priority = "overlay2,fuse-overlayfs,btrfs,zfs,devicemapper,vfs"
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// FsNames maps filesystem id to name of the filesystem.
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FsNames = map[FsMagic]string{
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FsMagicAufs: "aufs",
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FsMagicBtrfs: "btrfs",
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FsMagicCramfs: "cramfs",
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FsMagicEcryptfs: "ecryptfs",
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FsMagicExtfs: "extfs",
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FsMagicF2fs: "f2fs",
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FsMagicFUSE: "fuse",
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FsMagicGPFS: "gpfs",
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FsMagicJffs2Fs: "jffs2",
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FsMagicJfs: "jfs",
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FsMagicNfsFs: "nfs",
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FsMagicOverlay: "overlayfs",
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FsMagicRAMFs: "ramfs",
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FsMagicReiserFs: "reiserfs",
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FsMagicSmbFs: "smb",
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FsMagicSquashFs: "squashfs",
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FsMagicTmpFs: "tmpfs",
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FsMagicUnsupported: "unsupported",
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FsMagicVxFS: "vxfs",
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FsMagicXfs: "xfs",
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FsMagicZfs: "zfs",
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}
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)
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// GetFSMagic returns the filesystem id given the path.
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func GetFSMagic(rootpath string) (FsMagic, error) {
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var buf unix.Statfs_t
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if err := unix.Statfs(rootpath, &buf); err != nil {
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return 0, err
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}
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return FsMagic(buf.Type), nil
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}
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// NewFsChecker returns a checker configured for the provided FsMagic
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func NewFsChecker(t FsMagic) Checker {
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return &fsChecker{
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t: t,
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}
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}
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type fsChecker struct {
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t FsMagic
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}
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func (c *fsChecker) IsMounted(path string) bool {
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m, _ := Mounted(c.t, path)
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return m
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}
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// NewDefaultChecker returns a check that parses /proc/mountinfo to check
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// if the specified path is mounted.
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func NewDefaultChecker() Checker {
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return &defaultChecker{}
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}
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type defaultChecker struct {
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}
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func (c *defaultChecker) IsMounted(path string) bool {
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m, _ := mountinfo.Mounted(path)
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return m
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}
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// Mounted checks if the given path is mounted as the fs type
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func Mounted(fsType FsMagic, mountPath string) (bool, error) {
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var buf unix.Statfs_t
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if err := unix.Statfs(mountPath, &buf); err != nil {
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if err == unix.ENOENT { // not exist, thus not mounted
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err = nil
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}
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return false, err
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}
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return FsMagic(buf.Type) == fsType, nil
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}
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