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reload_nifs.go
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reload_nifs.go
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// (c) Siemens AG 2023
//
// SPDX-License-Identifier: MIT
package cshargextcap
import (
"fmt"
"io"
"sort"
"strings"
"github.com/siemens/cshargextcap/cfg"
"github.com/siemens/cshargextcap/cli/target"
log "github.com/sirupsen/logrus"
)
// ReloadContainerNifs reloads the list of network interfaces of a specific
// container. That is, it refreshes the list of the interface selector config
// arg. This helper is exported so additional extcaps can make use of it.
func ReloadContainerNifs(w io.Writer) {
// Check the container information, from which we'll later extract
// the list of network interfaces: if the container information is
// invalid, then silently return only the catch-all "all" network
// interface.
target := target.Unpack()
fmt.Fprintf(w, "value {arg=%d}{value=any}{display=all}{default=true}\n", cfg.ContainerNifs)
if target == nil {
log.Error("--container information missing or invalid")
return
}
// Get the list of network interface names from the container, and sort
// it.
log.Debugf("target: \"%s\"", target.Name)
nifs := target.NetworkInterfaces
sort.Strings(nifs)
log.Debugf("container network interfaces: %s", strings.Join(nifs, ", "))
// Finally, we can generate the list of network interfaces for this specific
// container, including the catch-all "all" (which we already printed out
// above).
for _, nif := range nifs {
fmt.Fprintf(w, "value {arg=%d}{value=%s}{display=%s}{default=false}\n",
cfg.ContainerNifs, nif, nif)
}
}