summaryrefslogtreecommitdiff
path: root/cmd/podman/exec.go
diff options
context:
space:
mode:
Diffstat (limited to 'cmd/podman/exec.go')
-rw-r--r--cmd/podman/exec.go30
1 files changed, 28 insertions, 2 deletions
diff --git a/cmd/podman/exec.go b/cmd/podman/exec.go
index 4917fb606..32a6e4bb5 100644
--- a/cmd/podman/exec.go
+++ b/cmd/podman/exec.go
@@ -4,7 +4,9 @@ import (
"fmt"
"github.com/containers/libpod/cmd/podman/cliconfig"
"github.com/spf13/cobra"
+ "io/ioutil"
"os"
+ "strconv"
"github.com/containers/libpod/cmd/podman/libpodruntime"
"github.com/containers/libpod/libpod"
@@ -47,6 +49,7 @@ func init() {
flags.BoolVarP(&execCommand.Tty, "tty", "t", false, "Allocate a pseudo-TTY. The default is false")
flags.StringVarP(&execCommand.User, "user", "u", "", "Sets the username or UID used and optionally the groupname or GID for the specified command")
+ flags.IntVar(&execCommand.PreserveFDs, "preserve-fds", 0, "Pass N additional file descriptors to the container")
flags.StringVarP(&execCommand.Workdir, "workdir", "w", "", "Working directory inside the container")
markFlagHiddenForRemoteClient("latest", flags)
}
@@ -82,11 +85,34 @@ func execCmd(c *cliconfig.ExecValues) error {
return errors.Wrapf(err, "unable to exec into %s", args[0])
}
+ if c.PreserveFDs > 0 {
+ entries, err := ioutil.ReadDir("/proc/self/fd")
+ if err != nil {
+ return errors.Wrapf(err, "unable to read /proc/self/fd")
+ }
+ m := make(map[int]bool)
+ for _, e := range entries {
+ i, err := strconv.Atoi(e.Name())
+ if err != nil {
+ if err != nil {
+ return errors.Wrapf(err, "cannot parse %s in /proc/self/fd", e.Name())
+ }
+ }
+ m[i] = true
+ }
+ for i := 3; i < 3+c.PreserveFDs; i++ {
+ if _, found := m[i]; !found {
+ return errors.New("invalid --preserve-fds=N specified. Not enough FDs available")
+ }
+ }
+
+ }
+
pid, err := ctr.PID()
if err != nil {
return err
}
- became, ret, err := rootless.JoinNS(uint(pid))
+ became, ret, err := rootless.JoinNS(uint(pid), c.PreserveFDs)
if err != nil {
return err
}
@@ -113,5 +139,5 @@ func execCmd(c *cliconfig.ExecValues) error {
streams.AttachError = true
streams.AttachInput = true
- return ctr.Exec(c.Tty, c.Privileged, envs, cmd, c.User, c.Workdir, streams)
+ return ctr.Exec(c.Tty, c.Privileged, envs, cmd, c.User, c.Workdir, streams, c.PreserveFDs)
}