118 lines
2.9 KiB
Go
118 lines
2.9 KiB
Go
package oci
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import (
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"context"
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"path/filepath"
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"strings"
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specs "github.com/opencontainers/runtime-spec/specs-go"
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"github.com/pkg/errors"
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)
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// MountOpts sets oci spec specific info for mount points
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type MountOpts func([]specs.Mount) ([]specs.Mount, error)
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//GetMounts returns default required for buildkit
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// https://github.com/moby/buildkit/issues/429
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func GetMounts(ctx context.Context, mountOpts ...MountOpts) ([]specs.Mount, error) {
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mounts := []specs.Mount{
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{
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Destination: "/proc",
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Type: "proc",
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Source: "proc",
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},
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{
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Destination: "/dev",
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Type: "tmpfs",
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Source: "tmpfs",
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Options: []string{"nosuid", "strictatime", "mode=755", "size=65536k"},
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},
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{
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Destination: "/dev/pts",
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Type: "devpts",
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Source: "devpts",
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Options: []string{"nosuid", "noexec", "newinstance", "ptmxmode=0666", "mode=0620", "gid=5"},
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},
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{
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Destination: "/dev/shm",
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Type: "tmpfs",
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Source: "shm",
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Options: []string{"nosuid", "noexec", "nodev", "mode=1777", "size=65536k"},
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},
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{
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Destination: "/dev/mqueue",
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Type: "mqueue",
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Source: "mqueue",
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Options: []string{"nosuid", "noexec", "nodev"},
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},
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{
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Destination: "/sys",
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Type: "sysfs",
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Source: "sysfs",
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Options: []string{"nosuid", "noexec", "nodev", "ro"},
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},
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}
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var err error
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for _, o := range mountOpts {
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mounts, err = o(mounts)
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if err != nil {
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return nil, err
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}
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}
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return mounts, nil
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}
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func withROBind(src, dest string) func(m []specs.Mount) ([]specs.Mount, error) {
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return func(m []specs.Mount) ([]specs.Mount, error) {
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m = append(m, specs.Mount{
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Destination: dest,
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Type: "bind",
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Source: src,
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Options: []string{"rbind", "ro"},
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})
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return m, nil
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}
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}
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func hasPrefix(p, prefixDir string) bool {
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prefixDir = filepath.Clean(prefixDir)
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if prefixDir == "/" {
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return true
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}
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p = filepath.Clean(p)
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return p == prefixDir || strings.HasPrefix(p, prefixDir+"/")
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}
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func removeMountsWithPrefix(mounts []specs.Mount, prefixDir string) []specs.Mount {
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var ret []specs.Mount
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for _, m := range mounts {
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if !hasPrefix(m.Destination, prefixDir) {
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ret = append(ret, m)
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}
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}
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return ret
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}
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func withProcessMode(processMode ProcessMode) func([]specs.Mount) ([]specs.Mount, error) {
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return func(m []specs.Mount) ([]specs.Mount, error) {
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switch processMode {
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case ProcessSandbox:
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// keep the default
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case NoProcessSandbox:
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m = removeMountsWithPrefix(m, "/proc")
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procMount := specs.Mount{
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Destination: "/proc",
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Type: "bind",
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Source: "/proc",
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// NOTE: "rbind"+"ro" does not make /proc read-only recursively.
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// So we keep maskedPath and readonlyPaths (although not mandatory for rootless mode)
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Options: []string{"rbind"},
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}
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m = append([]specs.Mount{procMount}, m...)
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default:
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return nil, errors.Errorf("unknown process mode: %v", processMode)
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}
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return m, nil
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}
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}
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