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Merge pull request #790 from Mirantis/jell/fixreboots
Fix handling of node reboot while there were running VMs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,126 @@ | ||
| /* | ||
| Copyright 2018 Mirantis | ||
| Licensed under the Apache License, Version 2.0 (the "License"); | ||
| you may not use this file except in compliance with the License. | ||
| You may obtain a copy of the License at | ||
| http://www.apache.org/licenses/LICENSE-2.0 | ||
| Unless required by applicable law or agreed to in writing, software | ||
| distributed under the License is distributed on an "AS IS" BASIS, | ||
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| See the License for the specific language governing permissions and | ||
| limitations under the License. | ||
| */ | ||
|
|
||
| package utils | ||
|
|
||
| import ( | ||
| "bufio" | ||
| "io" | ||
| "os" | ||
| "path/filepath" | ||
| "strings" | ||
|
|
||
| "github.com/golang/glog" | ||
| ) | ||
|
|
||
| type mountEntry struct { | ||
| Source string | ||
| Fs string | ||
| } | ||
|
|
||
| // MountPointChecker is used to check if a directory entry is a mount point. | ||
| // It returns its source info and filesystem type. | ||
| type MountPointChecker interface { | ||
| // CheckMountPointInfo checks if entry is a mountpoint (second returned value will be true) | ||
| // and if so returns mountInfo for it. In other case it returns false as a second value. | ||
| CheckMountPointInfo(string) (mountEntry, bool) | ||
| // IsPathAnNs verifies if the path is a mountpoint with nsfs filesystem type | ||
| IsPathAnNs(string) bool | ||
| } | ||
|
|
||
| type mountPointChecker struct { | ||
| mountInfo map[string]mountEntry | ||
| } | ||
|
|
||
| var _ MountPointChecker = mountPointChecker{} | ||
|
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| // NewMountPointChecker returns a new instance of MountPointChecker | ||
| func NewMountPointChecker() (MountPointChecker, error) { | ||
| file, err := os.Open("/proc/self/mountinfo") | ||
| if err != nil { | ||
| return mountPointChecker{}, err | ||
| } | ||
| defer file.Close() | ||
|
|
||
| mi := make(map[string]mountEntry) | ||
|
|
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| reader := bufio.NewReader(file) | ||
| LineReader: | ||
| for { | ||
| line, err := reader.ReadString('\n') | ||
| switch err { | ||
| case io.EOF: | ||
| break LineReader | ||
| case nil: | ||
| return mountPointChecker{}, err | ||
| } | ||
|
|
||
| // strip eol | ||
| line = strings.Trim(line, "\n") | ||
|
|
||
| // split and parse entries acording to section 3.5 in | ||
| // https://www.kernel.org/doc/Documentation/filesystems/proc.txt | ||
| // TODO: whitespaces and control chars in names are encoded as | ||
| // octal values (e.g. for "x x": "x\040x") what should be expanded | ||
| // in both mount point source and target | ||
| parts := strings.Split(line, " ") | ||
| mi[parts[4]] = mountEntry{Source: parts[9], Fs: parts[8]} | ||
| } | ||
| return mountPointChecker{mountInfo: mi}, nil | ||
| } | ||
|
|
||
| // CheckMountPointInfo implements CheckMountPointInfo method of MountPointChecker interface | ||
| func (mpc mountPointChecker) CheckMountPointInfo(path string) (mountEntry, bool) { | ||
| entry, ok := mpc.mountInfo[path] | ||
| return entry, ok | ||
| } | ||
|
|
||
| // IsPathNs implements IsPathAnNs method of MountPointChecker interface | ||
| func (mpc mountPointChecker) IsPathAnNs(path string) bool { | ||
| _, err := os.Stat(path) | ||
| if err != nil { | ||
| if !os.IsNotExist(err) { | ||
| glog.Errorf("Cannot verify existence of %q: %v", path, err) | ||
| } | ||
| return false | ||
| } | ||
| realpath, err := filepath.EvalSymlinks(path) | ||
| if err != nil { | ||
| glog.Errorf("Cannot verify real path of %q: %v", path, err) | ||
| return false | ||
| } | ||
|
|
||
| entry, isMountPoint := mpc.CheckMountPointInfo(realpath) | ||
| if !isMountPoint { | ||
| return false | ||
| } | ||
| return entry.Fs == "nsfs" | ||
| } | ||
|
|
||
| type fakeMountPointChecker struct{} | ||
|
|
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| // FakeMountPointChecker is defined there for unittests | ||
| var FakeMountPointChecker MountPointChecker = fakeMountPointChecker{} | ||
|
|
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| // CheckMountPointInfo is a fake implementation for MountPointChecker interface | ||
| func (mpc fakeMountPointChecker) CheckMountPointInfo(path string) (mountEntry, bool) { | ||
| return mountEntry{}, false | ||
| } | ||
|
|
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| // IsPathAnNs is a fake implementation for MountPointChecker interface | ||
| func (mpc fakeMountPointChecker) IsPathAnNs(path string) bool { | ||
| return false | ||
| } |