| 1 | package hostbox |
| 2 | |
| 3 | import ( |
| 4 | "context" |
| 5 | "fmt" |
| 6 | "io/fs" |
| 7 | "os" |
| 8 | "path/filepath" |
| 9 | ) |
| 10 | |
| 11 | // migrationRefusal names the root and path the migration census could not |
| 12 | // classify, so the operator sees which entry stopped it. It still wraps the |
| 13 | // census's own error. |
| 14 | func migrationRefusal(err error, root, rel string) error { |
| 15 | return fmt.Errorf("%w: migration census: %s entry %q is not classified", err, root, rel) |
| 16 | } |
| 17 | |
| 18 | // CheckMigrationRoots accounts for every managed entry under offline exclusion. |
| 19 | // Only independently retained inventory may classify an installation subtree. |
| 20 | func CheckMigrationRoots(ctx context.Context, roots map[string]string, shared map[string][]string, inventories []StopInventory) error { |
| 21 | entries := map[string]map[string]StopInventoryEntry{} |
| 22 | for _, in := range inventories { |
| 23 | if !in.Complete { |
| 24 | return ErrTypedInventory |
| 25 | } |
| 26 | for _, e := range in.Entries { |
| 27 | if e.Kind != "path" { |
| 28 | continue |
| 29 | } |
| 30 | if roots[e.ManagedRoot] == "" || !managedName(e.RelativePath) || e.Materialization != "materialized" || e.Device == 0 || e.Inode == 0 { |
| 31 | return ErrTypedInventory |
| 32 | } |
| 33 | if entries[e.ManagedRoot] == nil { |
| 34 | entries[e.ManagedRoot] = map[string]StopInventoryEntry{} |
| 35 | } |
| 36 | if _, ok := entries[e.ManagedRoot][e.RelativePath]; ok { |
| 37 | return ErrTypedInventory |
| 38 | } |
| 39 | entries[e.ManagedRoot][e.RelativePath] = e |
| 40 | } |
| 41 | } |
| 42 | for _, name := range []string{"data", "opt", "units"} { |
| 43 | root := roots[name] |
| 44 | if !filepath.IsAbs(root) { |
| 45 | return ErrTypedInventory |
| 46 | } |
| 47 | info, err := os.Lstat(root) |
| 48 | if err != nil { |
| 49 | return err |
| 50 | } |
| 51 | if !info.IsDir() || info.Mode()&os.ModeSymlink != 0 { |
| 52 | return ErrTypedInventory |
| 53 | } |
| 54 | rules, err := censusRules(shared[name], "migration-census.invalid") |
| 55 | if err != nil { |
| 56 | return err |
| 57 | } |
| 58 | count := 0 |
| 59 | if err := filepath.WalkDir(root, func(path string, d fs.DirEntry, walkErr error) error { |
| 60 | if walkErr != nil { |
| 61 | return walkErr |
| 62 | } |
| 63 | if err := ctx.Err(); err != nil { |
| 64 | return err |
| 65 | } |
| 66 | count++ |
| 67 | if count > 65536 { |
| 68 | return ErrTypedInventory |
| 69 | } |
| 70 | rel, err := filepath.Rel(root, path) |
| 71 | if err != nil { |
| 72 | return err |
| 73 | } |
| 74 | rel = filepath.ToSlash(rel) |
| 75 | if rel == "." { |
| 76 | return nil |
| 77 | } |
| 78 | if e, ok := entries[name][rel]; ok { |
| 79 | if err := VerifyInventoryIdentity(root, e); err != nil { |
| 80 | return err |
| 81 | } |
| 82 | |
| 83 | delete(entries[name], rel) |
| 84 | if d.IsDir() { |
| 85 | return filepath.SkipDir |
| 86 | } |
| 87 | return nil |
| 88 | } |
| 89 | if rule, ok := rules[rel]; ok { |
| 90 | err := rule.check(path, d) |
| 91 | if err != nil && err != filepath.SkipDir { |
| 92 | return migrationRefusal(err, name, rel) |
| 93 | } |
| 94 | return err |
| 95 | } |
| 96 | if name == "units" && censusVendorUnitLink(root, path) { |
| 97 | return nil |
| 98 | } |
| 99 | if censusInTree(rules, rel) && (d.IsDir() || d.Type().IsRegular()) { |
| 100 | return nil |
| 101 | } |
| 102 | if d.IsDir() { |
| 103 | return nil |
| 104 | } |
| 105 | return migrationRefusal(ErrTypedInventory, name, rel) |
| 106 | }); err != nil { |
| 107 | return err |
| 108 | } |
| 109 | if len(entries[name]) != 0 { |
| 110 | return ErrTypedInventory |
| 111 | } |
| 112 | } |
| 113 | return nil |
| 114 | } |
| 115 | |
amadan