// +build linux darwin /* Copyright 2014 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 util import ( "bytes" "fmt" "os/exec" "strings" "syscall" "k8s.io/apimachinery/pkg/api/resource" ) // FSInfo linux returns (available bytes, byte capacity, byte usage, total inodes, inodes free, inode usage, error) // for the filesystem that path resides upon. func FsInfo(path string) (int64, int64, int64, int64, int64, int64, error) { statfs := &syscall.Statfs_t{} err := syscall.Statfs(path, statfs) if err != nil { return 0, 0, 0, 0, 0, 0, err } // Available is blocks available * fragment size available := int64(statfs.Bavail) * int64(statfs.Bsize) // Capacity is total block count * fragment size capacity := int64(statfs.Blocks) * int64(statfs.Bsize) // Usage is block being used * fragment size (aka block size). usage := (int64(statfs.Blocks) - int64(statfs.Bfree)) * int64(statfs.Bsize) inodes := int64(statfs.Files) inodesFree := int64(statfs.Ffree) inodesUsed := inodes - inodesFree return available, capacity, usage, inodes, inodesFree, inodesUsed, nil } func Du(path string) (*resource.Quantity, error) { // Uses the same niceness level as cadvisor.fs does when running du // Uses -B 1 to always scale to a blocksize of 1 byte out, err := exec.Command("nice", "-n", "19", "du", "-s", "-B", "1", path).CombinedOutput() if err != nil { return nil, fmt.Errorf("failed command 'du' ($ nice -n 19 du -s -B 1) on path %s with error %v", path, err) } used, err := resource.ParseQuantity(strings.Fields(string(out))[0]) if err != nil { return nil, fmt.Errorf("failed to parse 'du' output %s due to error %v", out, err) } used.Format = resource.BinarySI return &used, nil } // Find uses the equivalent of the command `find <path> -dev -printf '.' | wc -c` to count files and directories. // While this is not an exact measure of inodes used, it is a very good approximation. func Find(path string) (int64, error) { if path == "" { return 0, fmt.Errorf("invalid directory") } var counter byteCounter var stderr bytes.Buffer findCmd := exec.Command("find", path, "-xdev", "-printf", ".") findCmd.Stdout, findCmd.Stderr = &counter, &stderr if err := findCmd.Start(); err != nil { return 0, fmt.Errorf("failed to exec cmd %v - %v; stderr: %v", findCmd.Args, err, stderr.String()) } if err := findCmd.Wait(); err != nil { return 0, fmt.Errorf("cmd %v failed. stderr: %s; err: %v", findCmd.Args, stderr.String(), err) } return counter.bytesWritten, nil } // Simple io.Writer implementation that counts how many bytes were written. type byteCounter struct{ bytesWritten int64 } func (b *byteCounter) Write(p []byte) (int, error) { b.bytesWritten += int64(len(p)) return len(p), nil }