Fix building pkg/util/procfs on non-linux platforms

pkg/util/procfs/procfs.go

@@ -16,134 +16,7 @@ limitations under the License.
 
 package procfs
 
-import (
-	"bytes"
-	"fmt"
-	"io/ioutil"
-	"os"
-	"path"
-	"path/filepath"
-	"regexp"
-	"strconv"
-	"strings"
-	"syscall"
-	"unicode"
-
-	"github.com/golang/glog"
-	utilerrors "k8s.io/kubernetes/pkg/util/errors"
-)
-
-type ProcFS struct{}
-
-func NewProcFS() ProcFSInterface {
-	return &ProcFS{}
-}
-
-func containerNameFromProcCgroup(content string) (string, error) {
-	lines := strings.Split(content, "\n")
-	for _, line := range lines {
-		entries := strings.SplitN(line, ":", 3)
-		if len(entries) == 3 && entries[1] == "devices" {
-			return strings.TrimSpace(entries[2]), nil
-		}
-	}
-	return "", fmt.Errorf("could not find devices cgroup location")
-}
-
-// getFullContainerName gets the container name given the root process id of the container.
-// Eg. If the devices cgroup for the container is stored in /sys/fs/cgroup/devices/docker/nginx,
-// return docker/nginx. Assumes that the process is part of exactly one cgroup hierarchy.
-func (pfs *ProcFS) GetFullContainerName(pid int) (string, error) {
-	filePath := path.Join("/proc", strconv.Itoa(pid), "cgroup")
-	content, err := ioutil.ReadFile(filePath)
-	if err != nil {
-		if os.IsNotExist(err) {
-			return "", os.ErrNotExist
-		}
-		return "", err
-	}
-	return containerNameFromProcCgroup(string(content))
-}
-
-// Find process(es) using a regular expression and send a specified
-// signal to each process
-func PKill(name string, sig syscall.Signal) error {
-	if len(name) == 0 {
-		return fmt.Errorf("name should not be empty")
-	}
-	re, err := regexp.Compile(name)
-	if err != nil {
-		return err
-	}
-	pids := getPids(re)
-	if len(pids) == 0 {
-		return fmt.Errorf("unable to fetch pids for process name : %q", name)
-	}
-	errList := []error{}
-	for _, pid := range pids {
-		if err = syscall.Kill(pid, sig); err != nil {
-			errList = append(errList, err)
-		}
-	}
-	return utilerrors.NewAggregate(errList)
-}
-
-// Find process(es) with a specified name (exact match)
-// and return their pid(s)
-func PidOf(name string) ([]int, error) {
-	if len(name) == 0 {
-		return []int{}, fmt.Errorf("name should not be empty")
-	}
-	re, err := regexp.Compile("(^|/)" + name + "$")
-	if err != nil {
-		return []int{}, err
-	}
-	return getPids(re), nil
-}
-
-func getPids(re *regexp.Regexp) []int {
-	pids := []int{}
-	filepath.Walk("/proc", func(path string, info os.FileInfo, err error) error {
-		if err != nil {
-			// We should continue processing other directories/files
-			return nil
-		}
-		base := filepath.Base(path)
-		// Traverse only the directories we are interested in
-		if info.IsDir() && path != "/proc" {
-			// If the directory is not a number (i.e. not a PID), skip it
-			if _, err := strconv.Atoi(base); err != nil {
-				return filepath.SkipDir
-			}
-		}
-		if base != "cmdline" {
-			return nil
-		}
-		cmdline, err := ioutil.ReadFile(path)
-		if err != nil {
-			glog.V(4).Infof("Error reading file %s: %+v", path, err)
-			return nil
-		}
-		// The bytes we read have '\0' as a separator for the command line
-		parts := bytes.SplitN(cmdline, []byte{0}, 2)
-		if len(parts) == 0 {
-			return nil
-		}
-		// Split the command line itself we are interested in just the first part
-		exe := strings.FieldsFunc(string(parts[0]), func(c rune) bool {
-			return unicode.IsSpace(c) || c == ':'
-		})
-		if len(exe) == 0 {
-			return nil
-		}
-		// Check if the name of the executable is what we are looking for
-		if re.MatchString(exe[0]) {
-			dirname := filepath.Base(filepath.Dir(path))
-			// Grab the PID from the directory path
-			pid, _ := strconv.Atoi(dirname)
-			pids = append(pids, pid)
-		}
-		return nil
-	})
-	return pids
+type ProcFSInterface interface {
+	// GetFullContainerName gets the container name given the root process id of the container.
+	GetFullContainerName(pid int) (string, error)
 }