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authorMatthew Heon <matthew.heon@gmail.com>2017-11-01 11:24:59 -0400
committerMatthew Heon <matthew.heon@gmail.com>2017-11-01 11:24:59 -0400
commita031b83a09a8628435317a03f199cdc18b78262f (patch)
treebc017a96769ce6de33745b8b0b1304ccf38e9df0 /vendor/github.com/containerd/cgroups/v1.go
parent2b74391cd5281f6fdf391ff8ad50fd1490f6bf89 (diff)
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Initial checkin from CRI-O repo
Signed-off-by: Matthew Heon <matthew.heon@gmail.com>
Diffstat (limited to 'vendor/github.com/containerd/cgroups/v1.go')
-rw-r--r--vendor/github.com/containerd/cgroups/v1.go65
1 files changed, 65 insertions, 0 deletions
diff --git a/vendor/github.com/containerd/cgroups/v1.go b/vendor/github.com/containerd/cgroups/v1.go
new file mode 100644
index 000000000..f6608f7c7
--- /dev/null
+++ b/vendor/github.com/containerd/cgroups/v1.go
@@ -0,0 +1,65 @@
+package cgroups
+
+import (
+ "bufio"
+ "fmt"
+ "os"
+ "path/filepath"
+ "strings"
+)
+
+// V1 returns all the groups in the default cgroups mountpoint in a single hierarchy
+func V1() ([]Subsystem, error) {
+ root, err := v1MountPoint()
+ if err != nil {
+ return nil, err
+ }
+ subsystems, err := defaults(root)
+ if err != nil {
+ return nil, err
+ }
+ var enabled []Subsystem
+ for _, s := range pathers(subsystems) {
+ // check and remove the default groups that do not exist
+ if _, err := os.Lstat(s.Path("/")); err == nil {
+ enabled = append(enabled, s)
+ }
+ }
+ return enabled, nil
+}
+
+// v1MountPoint returns the mount point where the cgroup
+// mountpoints are mounted in a single hiearchy
+func v1MountPoint() (string, error) {
+ f, err := os.Open("/proc/self/mountinfo")
+ if err != nil {
+ return "", err
+ }
+ defer f.Close()
+ scanner := bufio.NewScanner(f)
+ for scanner.Scan() {
+ if err := scanner.Err(); err != nil {
+ return "", err
+ }
+ var (
+ text = scanner.Text()
+ fields = strings.Split(text, " ")
+ // safe as mountinfo encodes mountpoints with spaces as \040.
+ index = strings.Index(text, " - ")
+ postSeparatorFields = strings.Fields(text[index+3:])
+ numPostFields = len(postSeparatorFields)
+ )
+ // this is an error as we can't detect if the mount is for "cgroup"
+ if numPostFields == 0 {
+ return "", fmt.Errorf("Found no fields post '-' in %q", text)
+ }
+ if postSeparatorFields[0] == "cgroup" {
+ // check that the mount is properly formated.
+ if numPostFields < 3 {
+ return "", fmt.Errorf("Error found less than 3 fields post '-' in %q", text)
+ }
+ return filepath.Dir(fields[4]), nil
+ }
+ }
+ return "", ErrMountPointNotExist
+}