github.com/google/cadvisor@v0.49.1/devicemapper/util.go (about)

     1  // Copyright 2016 Google Inc. All Rights Reserved.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package devicemapper
    16  
    17  import (
    18  	"fmt"
    19  	"os"
    20  	"path/filepath"
    21  )
    22  
    23  // ThinLsBinaryPresent returns the location of the thin_ls binary in the mount
    24  // namespace cadvisor is running in or an error.  The locations checked are:
    25  //
    26  // - /sbin/
    27  // - /bin/
    28  // - /usr/sbin/
    29  // - /usr/bin/
    30  //
    31  // The thin_ls binary is provided by the device-mapper-persistent-data
    32  // package.
    33  func ThinLsBinaryPresent() (string, error) {
    34  	var (
    35  		thinLsPath string
    36  		err        error
    37  	)
    38  
    39  	for _, path := range []string{"/sbin", "/bin", "/usr/sbin/", "/usr/bin"} {
    40  		// try paths for non-containerized operation
    41  		// note: thin_ls is most likely a symlink to pdata_tools
    42  		thinLsPath = filepath.Join(path, "thin_ls")
    43  		_, err = os.Stat(thinLsPath)
    44  		if err == nil {
    45  			return thinLsPath, nil
    46  		}
    47  	}
    48  
    49  	return "", fmt.Errorf("unable to find thin_ls binary")
    50  }