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// Copyright 2018 psgo 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 proc
import (
"bufio"
"fmt"
"io"
"os"
)
type IDMap struct {
ContainerID int
HostID int
Size int
}
// ParsePIDNamespace returns the content of /proc/$pid/ns/pid.
func ParsePIDNamespace(pid string) (string, error) {
pidNS, err := os.Readlink(fmt.Sprintf("/proc/%s/ns/pid", pid))
if err != nil {
return "", err
}
return pidNS, nil
}
// ParseUserNamespace returns the content of /proc/$pid/ns/user.
func ParseUserNamespace(pid string) (string, error) {
userNS, err := os.Readlink(fmt.Sprintf("/proc/%s/ns/user", pid))
if err != nil {
return "", err
}
return userNS, nil
}
// ReadMappings reads the user namespace mappings at the specified path
func ReadMappings(path string) ([]IDMap, error) {
file, err := os.Open(path)
if err != nil {
return nil, err
}
defer file.Close()
mappings := []IDMap{}
buf := bufio.NewReader(file)
for {
line, _, err := buf.ReadLine()
if err != nil {
if err == io.EOF { //nolint:errorlint // False positive, see https://github.com/polyfloyd/go-errorlint/pull/12
return mappings, nil
}
return nil, fmt.Errorf("cannot read line from %s: %w", path, err)
}
if line == nil {
return mappings, nil
}
containerID, hostID, size := 0, 0, 0
if _, err := fmt.Sscanf(string(line), "%d %d %d", &containerID, &hostID, &size); err != nil {
return nil, fmt.Errorf("cannot parse %s: %w", string(line), err)
}
mappings = append(mappings, IDMap{ContainerID: containerID, HostID: hostID, Size: size})
}
}
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