| 1 | package host |
| 2 | |
| 3 | import ( |
| 4 | "bytes" |
| 5 | "context" |
| 6 | "os" |
| 7 | |
| 8 | "github.com/carlosframework/platform/internal/rootstate" |
| 9 | ) |
| 10 | |
| 11 | // The caller holds the binding lock and has resolved the successor from the |
| 12 | // current root installation. A route edit never reaches this transition. |
| 13 | func (m claimUnitMaterializer) handover(ctx context.Context, old, next claimUnitBinding) error { |
| 14 | if m.state == nil || m.read == nil || m.replace == nil || m.idle == nil || !old.valid() || !next.valid() || !old.Retired || next.Retiring || next.Retired || old.Shape != next.Shape || old.Owner == next.Owner { |
| 15 | return os.ErrPermission |
| 16 | } |
| 17 | unlock, err := m.state.Lock(ctx, "materialize") |
| 18 | if err != nil { |
| 19 | return err |
| 20 | } |
| 21 | defer unlock() |
| 22 | r, err := m.load(old.Owner.Host) |
| 23 | if err != nil { |
| 24 | return err |
| 25 | } |
| 26 | want, err := claimOwnedUnitDefinition(next) |
| 27 | if err != nil { |
| 28 | return err |
| 29 | } |
| 30 | previous := old |
| 31 | previous.Retiring, previous.Retired = false, false |
| 32 | if r.Binding == previous { |
| 33 | if !r.Retired || r.Identity == (rootstate.FileIdentity{}) { |
| 34 | return os.ErrPermission |
| 35 | } |
| 36 | raw, id, err := m.read(old.Shape.Unit) |
| 37 | if err != nil { |
| 38 | return err |
| 39 | } |
| 40 | if !id.Same(r.Identity) || !bytes.Equal(raw, claimRetiredUnitDefinition(old)) { |
| 41 | return os.ErrPermission |
| 42 | } |
| 43 | r = claimUnitMaterialization{Binding: next, Digest: claimUnitDigest(want), Prior: old, PriorIdentity: r.Identity} |
| 44 | } |
| 45 | if r.Binding != next || r.Prior != old || r.Digest != claimUnitDigest(want) || r.Retiring || r.Retired { |
| 46 | return os.ErrPermission |
| 47 | } |
| 48 | if err = m.save(r); err != nil { |
| 49 | return err |
| 50 | } |
| 51 | raw, id, err := m.read(next.Shape.Unit) |
| 52 | if err != nil { |
| 53 | return err |
| 54 | } |
| 55 | if r.Identity == (rootstate.FileIdentity{}) && id.Same(r.PriorIdentity) && bytes.Equal(raw, claimRetiredUnitDefinition(old)) { |
| 56 | if err = m.idle(next.Shape.Host); err != nil { |
| 57 | return err |
| 58 | } |
| 59 | if err = m.replace(next.Shape.Unit, r.PriorIdentity, want); err != nil { |
| 60 | return err |
| 61 | } |
| 62 | raw, id, err = m.read(next.Shape.Unit) |
| 63 | if err != nil { |
| 64 | return err |
| 65 | } |
| 66 | } |
| 67 | if !bytes.Equal(raw, want) || id == (rootstate.FileIdentity{}) || (r.Identity != (rootstate.FileIdentity{}) && !r.Identity.Same(id)) { |
| 68 | return os.ErrPermission |
| 69 | } |
| 70 | r.Identity = id |
| 71 | return m.save(r) |
| 72 | } |
| 73 | |
amadan