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// Copyright 2016 Google Inc. All Rights Reserved.
//
// 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 devicemapper
import (
"fmt"
"os"
"path/filepath"
)
// ThinLsBinaryPresent returns the location of the thin_ls binary in the mount
// namespace cadvisor is running in or an error. The locations checked are:
//
// - /sbin/
// - /bin/
// - /usr/sbin/
// - /usr/bin/
//
// The thin_ls binary is provided by the device-mapper-persistent-data
// package.
func ThinLsBinaryPresent() (string, error) {
var (
thinLsPath string
err error
)
for _, path := range []string{"/sbin", "/bin", "/usr/sbin/", "/usr/bin"} {
// try paths for non-containerized operation
// note: thin_ls is most likely a symlink to pdata_tools
thinLsPath = filepath.Join(path, "thin_ls")
_, err = os.Stat(thinLsPath)
if err == nil {
return thinLsPath, nil
}
}
return "", fmt.Errorf("unable to find thin_ls binary")
}
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