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containerd: add access to default config

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when wanting to craft a custom config, but based on the default config,
add a route to output the containerd config to a tempfile.

Signed-off-by: Vincent Batts <vbatts@hashbangbash.com>
This commit is contained in:
Vincent Batts 2017-04-04 15:57:35 -04:00
parent 8affca40bb
commit 28d012ea00
Signed by: vbatts
GPG key ID: 10937E57733F1362
2 changed files with 30 additions and 2 deletions
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16
cmd/containerd/main.go
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@ -3,6 +3,7 @@ package main
import (
_ "expvar"
"fmt"
"io/ioutil"
"net/http"
_ "net/http/pprof"
"os"
@ -60,7 +61,7 @@ func main() {
app.Flags = []cli.Flag{
cli.StringFlag{
Name: "config,c",
Usage: "path to the configuration file",
Usage: "path to the configuration file (Use 'default' to output the default toml)",
Value: "/etc/containerd/config.toml",
},
cli.StringFlag{
@ -148,6 +149,19 @@ func main() {
}
func before(context *cli.Context) error {
if context.GlobalString("config") == "default" {
fh, err := ioutil.TempFile("", "containerd-config.toml.")
if err != nil {
return err
}
if _, err := conf.WriteTo(fh); err != nil {
fh.Close()
return err
}
fh.Close()
log.G(global).Infof("containerd default config written to %q", fh.Name())
os.Exit(0)
}
if err := loadConfig(context.GlobalString("config")); err != nil &&
!os.IsNotExist(err) {
return err