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Bootable containers #10

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merged 3 commits into from
Aug 2, 2017
Merged

Bootable containers #10

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6f6cc8b
cmd: add mobynit for host app booting
petrosagg Jul 25, 2017
6dd67d6
daemon: skip initLayer for bare runtime containers
petrosagg Jul 27, 2017
1a06eec
cmd/mobynit: accept a flag for the graph driver
petrosagg Aug 2, 2017
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12 changes: 11 additions & 1 deletion cmd/mobynit/main.go
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Original file line number Diff line number Diff line change
@@ -1,6 +1,7 @@
package main

import (
"flag"
"io/ioutil"
"log"
"os"
Expand All @@ -20,6 +21,13 @@ const (
PIVOT_PATH = "/mnt/sysroot"
)

var graphDriver string

func init() {
flag.StringVar(&graphDriver, "storage-driver", "aufs", "Storage driver to use")
flag.StringVar(&graphDriver, "s", "aufs", "Storage driver to use")
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@zozo123 zozo123 Aug 2, 2017 •
edited
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The second flag.StringVar will override the first one. I am not sure I get this. https://play.golang.org/p/7Pr_o3He8V

}

func mountContainer(containerID string) string {
if err := unix.Mount("", "/", "", unix.MS_REMOUNT, ""); err != nil {
log.Fatal("error remounting root as read/write:", err)
Expand All @@ -39,7 +47,7 @@ func mountContainer(containerID string) string {
StorePath: LAYER_ROOT,
MetadataStorePathTemplate: filepath.Join(LAYER_ROOT, "image", "%s", "layerdb"),
IDMappings: &idtools.IDMappings{},
GraphDriver: "aufs",
GraphDriver: graphDriver,
Platform: "linux",
})
if err != nil {
Expand Down Expand Up @@ -69,6 +77,8 @@ func mountContainer(containerID string) string {
}

func main() {
flag.Parse()

rawID, err := ioutil.ReadFile("/current/container_id")
if err != nil {
log.Fatal("could not get container ID:", err)
Expand Down