-
Notifications
You must be signed in to change notification settings - Fork 19
/
experimental-mount.go
82 lines (70 loc) · 2.08 KB
/
experimental-mount.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
//go:build linux
// +build linux
package cmd
import (
"fmt"
"os"
"path/filepath"
"syscall"
"github.com/spf13/cobra"
"github.com/gitpod-io/leeway/pkg/leeway"
)
// mountCmd represents the mount command
var mountCmd = &cobra.Command{
Use: "mount <destination>",
Short: "[experimental] Mounts a package or workspace variant",
Args: cobra.MinimumNArgs(1),
RunE: func(cmd *cobra.Command, args []string) error {
ws, err := getWorkspace()
if err != nil {
return fmt.Errorf("cannot load workspace: %q", err)
}
dest := args[0]
err = os.MkdirAll(dest, 0777)
if err != nil && !os.IsExist(err) {
return fmt.Errorf("cannot create destination dir: %q", err)
}
wdbase, _ := cmd.Flags().GetString("workdir")
if wdbase != "" {
err = os.MkdirAll(wdbase, 0777)
} else {
wdbase, err = os.MkdirTemp(filepath.Dir(dest), "leeway-workdir-*")
}
if err != nil && !os.IsExist(err) {
return err
}
var (
delup = filepath.Join(wdbase, "delup")
delmp = filepath.Join(wdbase, "delmp")
wd = filepath.Join(wdbase, "work")
upper = filepath.Join(wdbase, "upper")
)
for _, p := range []string{delup, delmp, wd, upper} {
err = os.MkdirAll(p, 0777)
if err != nil && !os.IsExist(err) {
return err
}
}
// prepare delup
err = syscall.Mount("overlay", delmp, "overlay", 0, fmt.Sprintf("lowerdir=%s,upperdir=%s,workdir=%s", ws.Origin, delup, wd))
if err != nil {
return fmt.Errorf("cannot mount delup overlay: %q", err)
}
strict, _ := cmd.Flags().GetBool("strict")
err = leeway.DeleteNonWorkspaceFiles(delmp, &ws, strict)
if err != nil {
return err
}
// actually mount overlay
err = syscall.Mount("overlay", dest, "overlay", 0, fmt.Sprintf("lowerdir=%s,upperdir=%s,workdir=%s", delmp, upper, wd))
if err != nil {
return fmt.Errorf("cannot mount overlay: %q", err)
}
return nil
},
}
func init() {
addExperimentalCommand(rootCmd, mountCmd)
mountCmd.Flags().String("workdir", "", "overlayfs workdir location (must be on the same volume as the destination)")
mountCmd.Flags().Bool("strict", false, "keep only package source files")
}