303bb7ca66
Docker-DCO-1.1-Signed-off-by: Michael Crosby <michael@crosbymichael.com> (github: crosbymichael)
40 lines
926 B
Go
40 lines
926 B
Go
package main
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import (
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"log"
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"strconv"
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"github.com/codegangsta/cli"
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"github.com/dotcloud/docker/pkg/libcontainer/namespaces"
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)
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var nsenterCommand = cli.Command{
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Name: "nsenter",
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Usage: "init process for entering an existing namespace",
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Action: nsenterAction,
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}
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func nsenterAction(context *cli.Context) {
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args := context.Args()
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if len(args) < 4 {
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log.Fatalf("incorrect usage: <pid> <process label> <container JSON> <cmd>...")
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}
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container, err := loadContainerFromJson(args.Get(2))
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if err != nil {
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log.Fatalf("unable to load container: %s", err)
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}
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nspid, err := strconv.Atoi(args.Get(0))
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if err != nil {
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log.Fatalf("unable to read pid: %s from %q", err, args.Get(0))
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}
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if nspid <= 0 {
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log.Fatalf("cannot enter into namespaces without valid pid: %q", nspid)
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}
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if err := namespaces.NsEnter(container, args.Get(1), nspid, args[3:]); err != nil {
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log.Fatalf("failed to nsenter: %s", err)
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}
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}
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