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package main
import (
"encoding/json"
"fmt"
"os"
buildahcli "github.com/containers/buildah/pkg/cli"
"github.com/sirupsen/logrus"
"github.com/spf13/cobra"
)
type jsonMount struct {
Container string `json:"container,omitempty"`
MountPoint string `json:"mountPoint"`
}
type mountOptions struct {
json bool
}
func init() {
var (
mountDescription = `buildah mount
mounts a working container's root filesystem for manipulation.
Note: In rootless mode you need to first execute buildah unshare, to put you
into the usernamespace. Afterwards you can buildah mount the container and
view/modify the content in the containers root file system.
`
opts mountOptions
noTruncate bool
)
mountCommand := &cobra.Command{
Use: "mount",
Short: "Mount a working container's root filesystem",
Long: mountDescription,
RunE: func(cmd *cobra.Command, args []string) error {
return mountCmd(cmd, args, opts)
},
Example: `buildah mount
buildah mount containerID
buildah mount containerID1 containerID2
In rootless mode you must use buildah unshare first.
buildah unshare
buildah mount containerID
`,
}
mountCommand.SetUsageTemplate(UsageTemplate())
flags := mountCommand.Flags()
flags.SetInterspersed(false)
flags.BoolVar(&opts.json, "json", false, "output in JSON format")
flags.BoolVar(&noTruncate, "notruncate", false, "do not truncate output")
rootCmd.AddCommand(mountCommand)
if err := flags.MarkHidden("notruncate"); err != nil {
logrus.Fatalf("error marking notruncate as hidden: %v", err)
}
}
func mountCmd(c *cobra.Command, args []string, opts mountOptions) error {
if err := buildahcli.VerifyFlagsArgsOrder(args); err != nil {
return err
}
store, err := getStore(c)
if err != nil {
return err
}
var jsonMounts []jsonMount
var lastError error
if len(args) > 0 {
// Do not allow to mount a graphdriver that is not vfs if we are creating the userns as part
// of the mount command.
// Differently, allow the mount if we are already in a userns, as the mount point will still
// be accessible once "buildah mount" exits.
if os.Geteuid() != 0 && store.GraphDriverName() != "vfs" {
return fmt.Errorf("cannot mount using driver %s in rootless mode. You need to run it in a `buildah unshare` session", store.GraphDriverName())
}
for _, name := range args {
builder, err := openBuilder(getContext(), store, name)
if err != nil {
if lastError != nil {
fmt.Fprintln(os.Stderr, lastError)
}
lastError = fmt.Errorf("reading build container %q: %w", name, err)
continue
}
mountPoint, err := builder.Mount(builder.MountLabel)
if err != nil {
if lastError != nil {
fmt.Fprintln(os.Stderr, lastError)
}
lastError = fmt.Errorf("mounting %q container %q: %w", name, builder.Container, err)
continue
}
if len(args) > 1 {
if opts.json {
jsonMounts = append(jsonMounts, jsonMount{Container: name, MountPoint: mountPoint})
continue
}
fmt.Printf("%s %s\n", name, mountPoint)
} else {
if opts.json {
jsonMounts = append(jsonMounts, jsonMount{MountPoint: mountPoint})
continue
}
fmt.Printf("%s\n", mountPoint)
}
}
} else {
builders, err := openBuilders(store)
if err != nil {
return fmt.Errorf("reading build containers: %w", err)
}
for _, builder := range builders {
mounted, err := builder.Mounted()
if err != nil {
return err
}
if mounted {
if opts.json {
jsonMounts = append(jsonMounts, jsonMount{Container: builder.Container, MountPoint: builder.MountPoint})
continue
}
fmt.Printf("%s %s\n", builder.Container, builder.MountPoint)
}
}
}
if opts.json {
data, err := json.MarshalIndent(jsonMounts, "", " ")
if err != nil {
return err
}
fmt.Printf("%s\n", data)
}
return lastError
}
|
