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// -*- Mode: Go; indent-tabs-mode: t -*-
/*
* Copyright (C) 2020 Canonical Ltd
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 3 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
package cgroup
import (
"fmt"
"path/filepath"
"strings"
)
func snapNameFromPidUsingTrackingCgroup(pid int) (string, error) {
// Maybe we have application tracking and can use it?
path, err := ProcessPathInTrackingCgroup(pid)
if err != nil {
return "", err
}
if parsedTag := securityTagFromCgroupPath(path); parsedTag != nil {
return parsedTag.InstanceName(), nil
}
return "", fmt.Errorf("cannot find snap security tag")
}
func snapNameFromPidUsingFreezerV1Cgroup(pid int) (string, error) {
// This logic only makes sense with cgroup v1.
if IsUnified() {
return "", fmt.Errorf("not supported")
}
// Find the path in the freezer cgroup.
group, err := ProcGroup(pid, MatchV1Controller("freezer"))
if err != nil {
return "", fmt.Errorf("cannot determine cgroup path of pid %v: %v", pid, err)
}
if !strings.HasPrefix(group, "/snap.") {
return "", fmt.Errorf("cannot find a snap for pid %v", pid)
}
// Extract the snap name form the path.
snapName := strings.SplitN(filepath.Base(group), ".", 2)[1]
if snapName == "" {
return "", fmt.Errorf("snap name in cgroup path is empty")
}
return snapName, nil
}
func SnapNameFromPid(pid int) (string, error) {
if snapName, err := snapNameFromPidUsingTrackingCgroup(pid); err == nil {
return snapName, nil
}
return snapNameFromPidUsingFreezerV1Cgroup(pid)
}
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