| 1 | package testenv |
| 2 | |
| 3 | import ( |
| 4 | "fmt" |
| 5 | "os" |
| 6 | "path/filepath" |
| 7 | "sync" |
| 8 | ) |
| 9 | |
| 10 | // TestingM is the subset of testing.M needed by RunWithIsolatedUserState. |
| 11 | type TestingM interface { |
| 12 | Run() int |
| 13 | } |
| 14 | |
| 15 | type savedEnvironment struct { |
| 16 | value string |
| 17 | set bool |
| 18 | } |
| 19 | |
| 20 | // IsolateUserState redirects default user-scoped Reasonix paths to a disposable |
| 21 | // home and clears inherited explicit path overrides. Tests may still override |
| 22 | // any of these variables for a focused scenario after this process-level guard |
| 23 | // is installed. |
| 24 | func IsolateUserState() (func(), error) { |
| 25 | originalHome, _ := os.UserHomeDir() |
| 26 | home, err := os.MkdirTemp(originalHome, ".reasonix-test-home-*") |
| 27 | if err != nil && originalHome != "" { |
| 28 | home, err = os.MkdirTemp("", "reasonix-test-home-*") |
| 29 | } |
| 30 | if err != nil { |
| 31 | return nil, fmt.Errorf("create isolated test home: %w", err) |
| 32 | } |
| 33 | |
| 34 | set := map[string]string{ |
| 35 | "HOME": home, |
| 36 | "USERPROFILE": home, |
| 37 | "XDG_CONFIG_HOME": filepath.Join(home, ".config"), |
| 38 | "XDG_CACHE_HOME": filepath.Join(home, ".cache"), |
| 39 | "XDG_STATE_HOME": filepath.Join(home, ".local", "state"), |
| 40 | "AppData": filepath.Join(home, "AppData", "Roaming"), |
| 41 | "LocalAppData": filepath.Join(home, "AppData", "Local"), |
| 42 | } |
| 43 | unset := []string{ |
| 44 | "REASONIX_HOME", |
| 45 | "REASONIX_STATE_HOME", |
| 46 | "REASONIX_CACHE_HOME", |
| 47 | } |
| 48 | |
| 49 | saved := make(map[string]savedEnvironment, len(set)+len(unset)) |
| 50 | remember := func(key string) { |
| 51 | if _, ok := saved[key]; ok { |
| 52 | return |
| 53 | } |
| 54 | value, ok := os.LookupEnv(key) |
| 55 | saved[key] = savedEnvironment{value: value, set: ok} |
| 56 | } |
| 57 | restore := func() { |
| 58 | for key, previous := range saved { |
| 59 | if previous.set { |
| 60 | _ = os.Setenv(key, previous.value) |
| 61 | } else { |
| 62 | _ = os.Unsetenv(key) |
| 63 | } |
| 64 | } |
| 65 | } |
| 66 | fail := func(cause error) (func(), error) { |
| 67 | restore() |
| 68 | _ = os.RemoveAll(home) |
| 69 | return nil, cause |
| 70 | } |
| 71 | |
| 72 | for key, value := range set { |
| 73 | remember(key) |
| 74 | if err := os.Setenv(key, value); err != nil { |
| 75 | return fail(fmt.Errorf("set %s for isolated test home: %w", key, err)) |
| 76 | } |
| 77 | } |
| 78 | for _, key := range unset { |
| 79 | remember(key) |
| 80 | if err := os.Unsetenv(key); err != nil { |
| 81 | return fail(fmt.Errorf("unset %s for isolated test home: %w", key, err)) |
| 82 | } |
| 83 | } |
| 84 | |
| 85 | var once sync.Once |
| 86 | return func() { |
| 87 | once.Do(func() { |
| 88 | restore() |
| 89 | _ = os.RemoveAll(home) |
| 90 | }) |
| 91 | }, nil |
| 92 | } |
| 93 | |
| 94 | // RunWithIsolatedUserState runs a package test binary behind the user-state |
| 95 | // isolation guard and exits with the test result. |
| 96 | func RunWithIsolatedUserState(m TestingM) { |
| 97 | cleanup, err := IsolateUserState() |
| 98 | if err != nil { |
| 99 | fmt.Fprintln(os.Stderr, err) |
| 100 | os.Exit(1) |
| 101 | } |
| 102 | exitCode := m.Run() |
| 103 | cleanup() |
| 104 | os.Exit(exitCode) |
| 105 | } |
| 106 |