| 1 | package host |
| 2 | |
| 3 | import ( |
| 4 | "errors" |
| 5 | "os" |
| 6 | |
| 7 | "github.com/carlosframework/platform/internal/hostbox" |
| 8 | "github.com/carlosframework/platform/internal/rootstate" |
| 9 | ) |
| 10 | |
| 11 | // A binding changes only boot-local device and mount numbers. Durable records keep their |
| 12 | // original identities; progress writes translate back to those identities. |
| 13 | type servingParkBootBinding struct { |
| 14 | Volume string `json:",omitempty"` |
| 15 | Version int |
| 16 | ID, BeforeBoot, BootID string |
| 17 | BeforeParent, Parent servingArtifactDirectory |
| 18 | } |
| 19 | |
| 20 | func servingParkReadBinding(state rootstate.Store, id string) (*servingParkBootBinding, error) { |
| 21 | body, err := state.Read("current-" + id + ".json") |
| 22 | if errors.Is(err, os.ErrNotExist) { |
| 23 | return nil, nil |
| 24 | } |
| 25 | if err != nil { |
| 26 | return nil, err |
| 27 | } |
| 28 | var b servingParkBootBinding |
| 29 | if servingParkDecode(body, &b) != nil || b.Version != 1 || b.ID != id || !validServingParkBootID(b.BeforeBoot) || !validServingParkBootID(b.BootID) || (b.BeforeBoot == b.BootID && b.BeforeParent.Device != b.Parent.Device) || b.BeforeParent.Device == 0 || b.BeforeParent.Inode == 0 || b.BeforeParent.Mount == 0 || b.Parent.Device == 0 || b.Parent.Inode != b.BeforeParent.Inode || b.Parent.Mount == 0 { |
| 30 | return nil, hostbox.ErrChanged |
| 31 | } |
| 32 | return &b, nil |
| 33 | } |
| 34 | |
| 35 | func (b servingParkBootBinding) directory(d *servingArtifactDirectory, reverse bool) error { |
| 36 | if *d == (servingArtifactDirectory{}) { |
| 37 | return nil |
| 38 | } |
| 39 | from, to := b.BeforeParent, b.Parent |
| 40 | if reverse { |
| 41 | from, to = to, from |
| 42 | } |
| 43 | if d.Device != from.Device || d.Mount != from.Mount { |
| 44 | return hostbox.ErrChanged |
| 45 | } |
| 46 | d.Device, d.Mount = to.Device, to.Mount |
| 47 | return nil |
| 48 | } |
| 49 | |
| 50 | func (b servingParkBootBinding) record(r *servingParkRecord, reverse bool) error { |
| 51 | from, to := b.BeforeBoot, b.BootID |
| 52 | if reverse { |
| 53 | from, to = to, from |
| 54 | } |
| 55 | parent := b.BeforeParent |
| 56 | if reverse { |
| 57 | parent = b.Parent |
| 58 | } |
| 59 | if b.ID != "retirement-"+r.Authorization.ID || r.Source.BootID != from || r.Source.Parent != parent { |
| 60 | return hostbox.ErrChanged |
| 61 | } |
| 62 | r.Source.BootID = to |
| 63 | for _, d := range []*servingArtifactDirectory{&r.Source.Directory, &r.Source.Parent, &r.Namespace, &r.Event, &r.Authorization.Directory} { |
| 64 | if err := b.directory(d, reverse); err != nil { |
| 65 | return err |
| 66 | } |
| 67 | } |
| 68 | // Copy before changing slices shared with a caller's immutable snapshot. |
| 69 | r.Continuations = append([]servingParkContinuation(nil), r.Continuations...) |
| 70 | for i := range r.Continuations { |
| 71 | if err := b.directory(&r.Continuations[i].Authorization.Directory, reverse); err != nil { |
| 72 | return err |
| 73 | } |
| 74 | } |
| 75 | for i := range r.Source.Files { |
| 76 | f := &r.Source.Files[i] |
| 77 | if !f.Present { |
| 78 | continue |
| 79 | } |
| 80 | d := servingArtifactDirectory{Device: f.Device, Inode: f.Inode, Mount: f.Mount} |
| 81 | if err := b.directory(&d, reverse); err != nil { |
| 82 | return err |
| 83 | } |
| 84 | f.Device, f.Mount = d.Device, d.Mount |
| 85 | } |
| 86 | return nil |
| 87 | } |
| 88 | |
| 89 | func (l *servingParkLedger) bindRecord(r *servingParkRecord, reverse bool) error { |
| 90 | if l.historical { |
| 91 | return nil |
| 92 | } |
| 93 | b, err := servingParkReadBinding(l.state, "retirement-"+r.Authorization.ID) |
| 94 | if err != nil || b == nil { |
| 95 | return err |
| 96 | } |
| 97 | return b.record(r, reverse) |
| 98 | } |
| 99 | |
amadan