| /* |
| Copyright 2015 The Kubernetes Authors. |
| |
| 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 glusterfs |
| |
| import ( |
| "bufio" |
| "fmt" |
| "os" |
| |
| "k8s.io/klog" |
| ) |
| |
| // readGlusterLog will take the last 2 lines of the log file |
| // on failure of gluster SetUp and return those so kubelet can |
| // properly expose them |
| // return error on any failure |
| func readGlusterLog(path string, podName string) error { |
| |
| var line1 string |
| var line2 string |
| linecount := 0 |
| |
| klog.Infof("failure, now attempting to read the gluster log for pod %s", podName) |
| |
| // Check and make sure path exists |
| if len(path) == 0 { |
| return fmt.Errorf("log file does not exist for pod %s", podName) |
| } |
| |
| // open the log file |
| file, err := os.Open(path) |
| if err != nil { |
| return fmt.Errorf("could not open log file for pod %s", podName) |
| } |
| defer file.Close() |
| |
| // read in and scan the file using scanner |
| // from stdlib |
| fscan := bufio.NewScanner(file) |
| |
| // rather than guessing on bytes or using Seek |
| // going to scan entire file and take the last two lines |
| // generally the file should be small since it is pod specific |
| for fscan.Scan() { |
| if linecount > 0 { |
| line1 = line2 |
| } |
| line2 = "\n" + fscan.Text() |
| |
| linecount++ |
| } |
| |
| if linecount > 0 { |
| return fmt.Errorf("%v", line1+line2+"\n") |
| } |
| return nil |
| } |