// Copyright 2018 The Prometheus 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 procfs import ( "fmt" "os" "strconv" "strings" ) // Namespace represents a single namespace of a process. type Namespace struct { Type string // Namespace type. Inode uint32 // Inode number of the namespace. If two processes are in the same namespace their inodes will match. } // Namespaces contains all of the namespaces that the process is contained in. type Namespaces map[string]Namespace // Namespaces reads from /proc/<pid>/ns/* to get the namespaces of which the // process is a member. func (p Proc) Namespaces() (Namespaces, error) { d, err := os.Open(p.path("ns")) if err != nil { return nil, err } defer d.Close() names, err := d.Readdirnames(-1) if err != nil { return nil, fmt.Errorf("%s: failed to read contents of ns dir: %w", ErrFileRead, err) } ns := make(Namespaces, len(names)) for _, name := range names { target, err := os.Readlink(p.path("ns", name)) if err != nil { return nil, err } fields := strings.SplitN(target, ":", 2) if len(fields) != 2 { return nil, fmt.Errorf("%w: namespace type and inode from %q", ErrFileParse, target) } typ := fields[0] inode, err := strconv.ParseUint(strings.Trim(fields[1], "[]"), 10, 32) if err != nil { return nil, fmt.Errorf("%s: inode from %q: %w", ErrFileParse, fields[1], err) } ns[name] = Namespace{typ, uint32(inode)} } return ns, nil }