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