Commit f3de60ff authored by Chris Kim's avatar Chris Kim
Browse files

When there is a defined cgroup for PID 1, assume we are containerized and set a root


Signed-off-by: default avatarChris Kim <oats87g@gmail.com>
parent ff5a6fe3
......@@ -194,12 +194,31 @@ func checkCgroups() (root string, hasCFS bool, hasPIDs bool) {
if _, err := os.Stat(p); err == nil {
hasCFS = true
}
} else if system == "name=systemd" {
}
}
}
// Examine process ID 1 to see if there is a cgroup assigned to it.
// When we are not in a container, process 1 is likely to be systemd or some other service manager.
// When containerized, process 1 will be generally be in a cgroup, otherwise, we may be running in
// a host PID scenario but we don't support this.
g, err := os.Open("/proc/1/cgroup")
if err != nil {
return "", false, false
}
defer g.Close()
root = ""
scan = bufio.NewScanner(g)
for scan.Scan() {
parts := strings.Split(scan.Text(), ":")
if len(parts) < 3 {
continue
}
systems := strings.Split(parts[1], ",")
for _, system := range systems {
if system == "name=systemd" {
last := parts[len(parts)-1]
i := strings.LastIndex(last, ".slice")
if i > 0 {
root = "/systemd" + last[:i+len(".slice")]
} else {
if last != "/" {
root = "/systemd"
}
}
......
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