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b94ee6bcb1
This patch takes all the HostUtil functionality currently found in mount*.go files and copies it into hostutil*.go files. Care was taken to preserve git history to the fullest extent. As part of doing this, some common functionality was moved into mount_helper files in preperation for HostUtils to stay in k/k and Mount to move out. THe tests for each relevant function were moved to test files to match the appropriate location.
115 lines
4.1 KiB
Go
115 lines
4.1 KiB
Go
/*
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Copyright 2014 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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// TODO(thockin): This whole pkg is pretty linux-centric. As soon as we have
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// an alternate platform, we will need to abstract further.
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package mount
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import (
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"fmt"
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"os"
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)
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// FileType enumerates the known set of possible file types.
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type FileType string
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const (
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// FileTypeBlockDev defines a constant for the block device FileType.
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FileTypeBlockDev FileType = "BlockDevice"
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// FileTypeCharDev defines a constant for the character device FileType.
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FileTypeCharDev FileType = "CharDevice"
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// FileTypeDirectory defines a constant for the directory FileType.
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FileTypeDirectory FileType = "Directory"
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// FileTypeFile defines a constant for the file FileType.
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FileTypeFile FileType = "File"
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// FileTypeSocket defines a constant for the socket FileType.
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FileTypeSocket FileType = "Socket"
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// FileTypeUnknown defines a constant for an unknown FileType.
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FileTypeUnknown FileType = ""
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)
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// HostUtils defines the set of methods for interacting with paths on a host.
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type HostUtils interface {
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// DeviceOpened determines if the device (e.g. /dev/sdc) is in use elsewhere
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// on the system, i.e. still mounted.
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DeviceOpened(pathname string) (bool, error)
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// PathIsDevice determines if a path is a device.
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PathIsDevice(pathname string) (bool, error)
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// GetDeviceNameFromMount finds the device name by checking the mount path
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// to get the global mount path within its plugin directory.
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GetDeviceNameFromMount(mounter Interface, mountPath, pluginMountDir string) (string, error)
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// MakeRShared checks that given path is on a mount with 'rshared' mount
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// propagation. If not, it bind-mounts the path as rshared.
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MakeRShared(path string) error
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// GetFileType checks for file/directory/socket/block/character devices.
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GetFileType(pathname string) (FileType, error)
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// MakeFile creates an empty file.
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MakeFile(pathname string) error
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// MakeDir creates a new directory.
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MakeDir(pathname string) error
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// PathExists tests if the given path already exists
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// Error is returned on any other error than "file not found".
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PathExists(pathname string) (bool, error)
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// EvalHostSymlinks returns the path name after evaluating symlinks.
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EvalHostSymlinks(pathname string) (string, error)
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// GetOwner returns the integer ID for the user and group of the given path
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GetOwner(pathname string) (int64, int64, error)
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// GetSELinuxSupport returns true if given path is on a mount that supports
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// SELinux.
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GetSELinuxSupport(pathname string) (bool, error)
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// GetMode returns permissions of the path.
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GetMode(pathname string) (os.FileMode, error)
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}
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// Compile-time check to ensure all HostUtil implementations satisfy
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// the HostUtils Interface.
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var _ HostUtils = &hostUtil{}
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// getFileType checks for file/directory/socket and block/character devices.
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func getFileType(pathname string) (FileType, error) {
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var pathType FileType
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info, err := os.Stat(pathname)
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if os.IsNotExist(err) {
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return pathType, fmt.Errorf("path %q does not exist", pathname)
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}
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// err in call to os.Stat
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if err != nil {
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return pathType, err
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}
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// checks whether the mode is the target mode.
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isSpecificMode := func(mode, targetMode os.FileMode) bool {
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return mode&targetMode == targetMode
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}
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mode := info.Mode()
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if mode.IsDir() {
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return FileTypeDirectory, nil
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} else if mode.IsRegular() {
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return FileTypeFile, nil
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} else if isSpecificMode(mode, os.ModeSocket) {
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return FileTypeSocket, nil
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} else if isSpecificMode(mode, os.ModeDevice) {
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if isSpecificMode(mode, os.ModeCharDevice) {
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return FileTypeCharDev, nil
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}
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return FileTypeBlockDev, nil
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}
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return pathType, fmt.Errorf("only recognise file, directory, socket, block device and character device")
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}
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