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Checking containers on first run + cleanup #14

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156 changes: 87 additions & 69 deletions main.go
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Original file line number Diff line number Diff line change
Expand Up @@ -8,16 +8,17 @@ import (
"context"
"device-volume-driver/internal/cgroup"
"fmt"
"github.com/docker/docker/api/types"
"github.com/docker/docker/api/types/filters"
"github.com/docker/docker/client"
_ "github.com/opencontainers/runtime-spec/specs-go"
"golang.org/x/sys/unix"
"log"
"os"
"path"
"path/filepath"
"strings"

"github.com/docker/docker/api/types"
"github.com/docker/docker/api/types/filters"
"github.com/docker/docker/client"
_ "github.com/opencontainers/runtime-spec/specs-go"
"golang.org/x/sys/unix"
)

const pluginId = "dvd"
Expand All @@ -28,7 +29,18 @@ func Ptr[T any](v T) *T {
}

func main() {
listenForMounts()
log.Printf("Starting\n")

cli, err := client.NewClientWithOpts(client.FromEnv, client.WithAPIVersionNegotiation())

if err != nil {
log.Fatal(err)
}

defer cli.Close()

checkExistingContainers(cli)
listenForMounts(cli)
}

func getDeviceInfo(devicePath string) (string, int64, int64, error) {
Expand Down Expand Up @@ -59,19 +71,9 @@ func getDeviceInfo(devicePath string) (string, int64, int64, error) {
return deviceType, major, minor, nil
}

func listenForMounts() {
ctx := context.Background()

cli, err := client.NewClientWithOpts(client.FromEnv, client.WithAPIVersionNegotiation())

if err != nil {
log.Fatal(err)
}

defer cli.Close()

func listenForMounts(cli *client.Client) {
msgs, errs := cli.Events(
ctx,
context.Background(),
types.EventsOptions{Filters: filters.NewArgs(filters.Arg("event", "start"))},
)

Expand All @@ -80,78 +82,94 @@ func listenForMounts() {
case err := <-errs:
log.Fatal(err)
case msg := <-msgs:
info, err := cli.ContainerInspect(ctx, msg.Actor.ID)
processContainer(cli, msg.Actor.ID)
}
}
}

if err != nil {
panic(err)
} else {
pid := info.State.Pid
version, err := cgroup.GetDeviceCGroupVersion("/", pid)
func processContainer(cli *client.Client, id string) {
info, err := cli.ContainerInspect(context.Background(), id)

log.Printf("The cgroup version for process %d is: %v\n", pid, version)
if err != nil {
panic(err)
} else {
pid := info.State.Pid
version, err := cgroup.GetDeviceCGroupVersion("/", pid)

if err != nil {
log.Println(err)
break
}
log.Printf("The cgroup version for process %d is: %v\n", pid, version)

log.Printf("Checking mounts for process %d\n", pid)
if err != nil {
log.Println(err)
return
}

for _, mount := range info.Mounts {
log.Printf(
"%s/%v requested a volume mount for %s at %s\n",
msg.Actor.ID, info.State.Pid, mount.Source, mount.Destination,
)
log.Printf("Checking mounts for process %d\n", pid)

if !strings.HasPrefix(mount.Source, "/dev") {
log.Printf("%s is not a device... skipping\n", mount.Source)
continue
}
for _, mount := range info.Mounts {
log.Printf(
"%s/%v requested a volume mount for %s at %s\n",
id, info.State.Pid, mount.Source, mount.Destination,
)

api, err := cgroup.New(version)
cgroupPath, sysfsPath, err := api.GetDeviceCGroupMountPath("/", pid)
if !strings.HasPrefix(mount.Source, "/dev") {
log.Printf("%s is not a device... skipping\n", mount.Source)
continue
}

if err != nil {
log.Println(err)
break
}
api, err := cgroup.New(version)
cgroupPath, sysfsPath, err := api.GetDeviceCGroupMountPath("/", pid)

cgroupPath = path.Join(rootPath, sysfsPath, cgroupPath)
if err != nil {
log.Println(err)
break
}

log.Printf("The cgroup path for process %d is at %v\n", pid, cgroupPath)
cgroupPath = path.Join(rootPath, sysfsPath, cgroupPath)

if fileInfo, err := os.Stat(mount.Source); err != nil {
log.Println(err)
continue
} else {
if fileInfo.IsDir() {
err := filepath.Walk(mount.Source,
func(path string, info os.FileInfo, err error) error {
if err != nil {
return err
} else if info.IsDir() {
return nil
} else if err = applyDeviceRules(api, path, cgroupPath, pid); err != nil {
log.Println(err)
}
return nil
})
log.Printf("The cgroup path for process %d is at %v\n", pid, cgroupPath)

if fileInfo, err := os.Stat(mount.Source); err != nil {
log.Println(err)
continue
} else {
if fileInfo.IsDir() {
err := filepath.Walk(mount.Source,
func(path string, info os.FileInfo, err error) error {
if err != nil {
return err
} else if info.IsDir() {
return nil
} else if err = applyDeviceRules(api, path, cgroupPath, pid); err != nil {
log.Println(err)
}
} else {
if err = applyDeviceRules(api, mount.Source, cgroupPath, pid); err != nil {
log.Println(err)
}
}
return nil
})
if err != nil {
log.Println(err)
}
} else {
if err = applyDeviceRules(api, mount.Source, cgroupPath, pid); err != nil {
log.Println(err)
}

}
}
}
}
}

func checkExistingContainers(cli *client.Client) {
containers, err := cli.ContainerList(context.Background(), types.ContainerListOptions{})

if err != nil {
panic(err)
}

for _, container := range containers {
log.Printf("Checking existing container %s %s\n", container.ID[:10], container.Image)
processContainer(cli, container.ID)
}
}

func applyDeviceRules(api cgroup.Interface, mountPath string, cgroupPath string, pid int) error {
deviceType, major, minor, err := getDeviceInfo(mountPath)

Expand Down