cc44a1fa49
- Merge plugin defaults, sorted YAML, SUMMER_ env, overrides and Set - Persist atomically to env overrides; Reload clears runtime Set - Discover HasConfig before Register and print layered hello values
108 lines
2.7 KiB
Go
108 lines
2.7 KiB
Go
package compass
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import (
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"fmt"
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"os"
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"path/filepath"
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"strings"
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"github.com/knadh/koanf/parsers/yaml"
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"github.com/knadh/koanf/v2"
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)
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// Set stores an in-memory override that wins over every file and env layer.
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func (c *Config) Set(path string, value any) error {
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if c == nil {
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return fmt.Errorf("compass: config is nil")
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}
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if path == "" {
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return fmt.Errorf("compass: empty config path")
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}
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c.mu.Lock()
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defer c.mu.Unlock()
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if c.runtime == nil {
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c.runtime = koanf.New(".")
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}
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return c.runtime.Set(path, value)
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}
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// Persist writes runtime overrides to config/env/<env>/overrides.yaml
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// using an atomic replace and restrictive file permissions.
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func (c *Config) Persist() error {
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if c == nil {
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return fmt.Errorf("compass: config is nil")
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}
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c.mu.Lock()
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defer c.mu.Unlock()
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if c.dir == "" {
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return fmt.Errorf("compass: config directory is empty")
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}
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env, err := sanitizeEnv(c.env)
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if err != nil {
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return err
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}
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destDir, dest, err := overridesPath(c.dir, env)
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if err != nil {
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return err
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}
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if err := os.MkdirAll(destDir, 0o700); err != nil {
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return fmt.Errorf("compass: create overrides dir: %w", err)
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}
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raw := []byte("{}\n")
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if c.runtime != nil {
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body, err := c.runtime.Marshal(yaml.Parser())
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if err != nil {
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return fmt.Errorf("compass: marshal overrides: %w", err)
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}
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raw = body
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}
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tmp := dest + ".tmp"
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if err := os.WriteFile(tmp, raw, 0o600); err != nil {
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return fmt.Errorf("compass: write overrides: %w", err)
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}
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if err := os.Rename(tmp, dest); err != nil {
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_ = os.Remove(tmp)
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return fmt.Errorf("compass: persist overrides: %w", err)
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}
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return nil
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}
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// Reload rebuilds the tree from disk and plugin sources and clears runtime Set.
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func (c *Config) Reload() error {
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if c == nil {
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return fmt.Errorf("compass: config is nil")
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}
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c.mu.Lock()
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defer c.mu.Unlock()
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c.runtime = koanf.New(".")
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if err := c.refreshSources(); err != nil {
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return err
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}
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return c.rebuild()
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}
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func overridesPath(dir, env string) (destDir, dest string, err error) {
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root, err := filepath.Abs(dir)
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if err != nil {
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return "", "", fmt.Errorf("compass: resolve config dir: %w", err)
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}
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root = filepath.Clean(root)
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destDir = filepath.Clean(filepath.Join(root, "env", env))
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if !within(root, destDir) {
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return "", "", fmt.Errorf("compass: persist path escapes config directory")
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}
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dest = filepath.Clean(filepath.Join(destDir, "overrides.yaml"))
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if !within(destDir, dest) {
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return "", "", fmt.Errorf("compass: persist path escapes config directory")
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}
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return destDir, dest, nil
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}
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func within(root, path string) bool {
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rel, err := filepath.Rel(root, path)
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if err != nil {
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return false
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}
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return rel == "." || (rel != ".." && !strings.HasPrefix(rel, ".."+string(os.PathSeparator)))
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}
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