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f7afb9b6ca
Saves 33 KB. Updates #12614 Change-Id: Ie701c230e0765281f409f29ed263910b9be9cc77 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
104 lines
3.0 KiB
Go
104 lines
3.0 KiB
Go
// Copyright (c) Tailscale Inc & AUTHORS
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// SPDX-License-Identifier: BSD-3-Clause
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// Package conffile contains code to load, manipulate, and access config file
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// settings.
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package conffile
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import (
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"bytes"
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"encoding/json"
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"fmt"
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"os"
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"runtime"
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"tailscale.com/feature/buildfeatures"
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"tailscale.com/ipn"
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)
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// Config describes a config file.
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type Config struct {
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Path string // disk path of HuJSON, or VMUserDataPath
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Raw []byte // raw bytes from disk, in HuJSON form
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Std []byte // standardized JSON form
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Version string // "alpha0" for now
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// Parsed is the parsed config, converted from its on-disk version to the
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// latest known format.
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//
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// As of 2023-10-15 there is exactly one format ("alpha0") so this is both
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// the on-disk format and the in-memory upgraded format.
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Parsed ipn.ConfigVAlpha
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}
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// WantRunning reports whether c is non-nil and it's configured to be running.
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func (c *Config) WantRunning() bool {
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return c != nil && !c.Parsed.Enabled.EqualBool(false)
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}
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// VMUserDataPath is a sentinel value for Load to use to get the data
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// from the VM's metadata service's user-data field.
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const VMUserDataPath = "vm:user-data"
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// hujsonStandardize is set to hujson.Standardize by conffile_hujson.go on
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// platforms that support config files.
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var hujsonStandardize func([]byte) ([]byte, error)
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// Load reads and parses the config file at the provided path on disk.
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func Load(path string) (*Config, error) {
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switch runtime.GOOS {
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case "ios", "android":
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// compile-time for deadcode elimination
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return nil, fmt.Errorf("config file loading not supported on %q", runtime.GOOS)
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}
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var c Config
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c.Path = path
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var err error
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switch path {
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case VMUserDataPath:
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c.Raw, err = readVMUserData()
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default:
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c.Raw, err = os.ReadFile(path)
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}
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if err != nil {
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return nil, err
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}
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if buildfeatures.HasHuJSONConf && hujsonStandardize != nil {
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c.Std, err = hujsonStandardize(c.Raw)
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if err != nil {
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return nil, fmt.Errorf("error parsing config file %s HuJSON/JSON: %w", path, err)
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}
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} else {
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c.Std = c.Raw // config file must be valid JSON with ts_omit_hujsonconf
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}
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var ver struct {
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Version string `json:"version"`
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}
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if err := json.Unmarshal(c.Std, &ver); err != nil {
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if !buildfeatures.HasHuJSONConf {
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return nil, fmt.Errorf("error parsing config file %s, which must be valid standard JSON: %w", path, err)
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}
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return nil, fmt.Errorf("error parsing config file %s: %w", path, err)
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}
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switch ver.Version {
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case "":
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return nil, fmt.Errorf("error parsing config file %s: no \"version\" field defined", path)
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case "alpha0":
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default:
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return nil, fmt.Errorf("error parsing config file %s: unsupported \"version\" value %q; want \"alpha0\" for now", path, ver.Version)
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}
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c.Version = ver.Version
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jd := json.NewDecoder(bytes.NewReader(c.Std))
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jd.DisallowUnknownFields()
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err = jd.Decode(&c.Parsed)
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if err != nil {
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return nil, fmt.Errorf("error parsing config file %s: %w", path, err)
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}
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if jd.More() {
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return nil, fmt.Errorf("error parsing config file %s: trailing data after JSON object", path)
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}
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return &c, nil
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}
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