AdGuardHome/internal/next/cmd/opt.go

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package cmd
import (
"encoding"
"flag"
"fmt"
"io"
"io/fs"
"net/netip"
"os"
"slices"
"strings"
"github.com/AdguardTeam/AdGuardHome/internal/configmigrate"
"github.com/AdguardTeam/AdGuardHome/internal/next/configmgr"
"github.com/AdguardTeam/AdGuardHome/internal/version"
"github.com/AdguardTeam/golibs/log"
)
// options contains all command-line options for the AdGuardHome(.exe) binary.
type options struct {
// confFile is the path to the configuration file.
confFile string
// logFile is the path to the log file. Special values:
//
// - "stdout": Write to stdout (the default).
// - "stderr": Write to stderr.
// - "syslog": Write to the system log.
logFile string
// pidFile is the path to the file where to store the PID.
pidFile string
// serviceAction is the service control action to perform:
//
// - "install": Installs AdGuard Home as a system service.
// - "uninstall": Uninstalls it.
// - "status": Prints the service status.
// - "start": Starts the previously installed service.
// - "stop": Stops the previously installed service.
// - "restart": Restarts the previously installed service.
// - "reload": Reloads the configuration.
// - "run": This is a special command that is not supposed to be used
// directly it is specified when we register a service, and it indicates
// to the app that it is being run as a service.
//
// TODO(a.garipov): Use.
serviceAction string
// workDir is the path to the working directory. It is applied before all
// other configuration is read, so all relative paths are relative to it.
workDir string
// webAddr contains the address on which to serve the web UI.
webAddr netip.AddrPort
// checkConfig, if true, instructs AdGuard Home to check the configuration
// file, optionally print an error message to stdout, and exit with a
// corresponding exit code.
checkConfig bool
// disableUpdate, if true, prevents AdGuard Home from automatically checking
// for updates.
//
// TODO(a.garipov): Use.
disableUpdate bool
// glinetMode enables the GL-Inet compatibility mode.
//
// TODO(a.garipov): Use.
glinetMode bool
// help, if true, instructs AdGuard Home to print the command-line option
// help message and quit with a successful exit-code.
help bool
// localFrontend, if true, instructs AdGuard Home to use the local frontend
// directory instead of the files compiled into the binary.
//
// TODO(a.garipov): Use.
localFrontend bool
// performUpdate, if true, instructs AdGuard Home to update the current
// binary and restart the service in case it's installed.
//
// TODO(a.garipov): Use.
performUpdate bool
// verbose, if true, instructs AdGuard Home to enable verbose logging.
verbose bool
// version, if true, instructs AdGuard Home to print the version to stdout
// and quit with a successful exit-code. If verbose is also true, print a
// more detailed version description.
version bool
}
// Indexes to help with the [commandLineOptions] initialization.
const (
confFileIdx = iota
logFileIdx
pidFileIdx
serviceActionIdx
workDirIdx
webAddrIdx
checkConfigIdx
disableUpdateIdx
glinetModeIdx
helpIdx
localFrontend
performUpdateIdx
verboseIdx
versionIdx
)
// commandLineOption contains information about a command-line option: its long
// and, if there is one, short forms, the value type, the description, and the
// default value.
type commandLineOption struct {
defaultValue any
description string
long string
short string
valueType string
}
// commandLineOptions are all command-line options currently supported by
// AdGuard Home.
var commandLineOptions = []*commandLineOption{
confFileIdx: {
// TODO(a.garipov): Remove the directory when the new code is ready.
defaultValue: "internal/next/AdGuardHome.yaml",
description: "Path to the config file.",
long: "config",
short: "c",
valueType: "path",
},
logFileIdx: {
defaultValue: "stdout",
description: `Path to log file. Special values include "stdout", "stderr", and "syslog".`,
long: "logfile",
short: "l",
valueType: "path",
},
pidFileIdx: {
defaultValue: "",
description: "Path to the file where to store the PID.",
long: "pidfile",
short: "",
valueType: "path",
},
serviceActionIdx: {
defaultValue: "",
description: `Service control action: "status", "install" (as a service), ` +
`"uninstall" (as a service), "start", "stop", "restart", "reload" (configuration).`,
long: "service",
short: "s",
valueType: "action",
},
workDirIdx: {
defaultValue: "",
description: `Path to the working directory. ` +
`It is applied before all other configuration is read, ` +
`so all relative paths are relative to it.`,
long: "work-dir",
short: "w",
valueType: "path",
},
webAddrIdx: {
defaultValue: netip.AddrPort{},
description: `Address to serve the web UI on, in the host:port format.`,
long: "web-addr",
short: "",
valueType: "host:port",
},
checkConfigIdx: {
defaultValue: false,
description: "Check configuration, print errors to stdout, and quit.",
long: "check-config",
short: "",
valueType: "",
},
disableUpdateIdx: {
defaultValue: false,
description: "Disable automatic update checking.",
long: "no-check-update",
short: "",
valueType: "",
},
glinetModeIdx: {
defaultValue: false,
description: "Run in GL-Inet compatibility mode.",
long: "glinet",
short: "",
valueType: "",
},
helpIdx: {
defaultValue: false,
description: "Print this help message and quit.",
long: "help",
short: "h",
valueType: "",
},
localFrontend: {
defaultValue: false,
description: "Use local frontend directories.",
long: "local-frontend",
short: "",
valueType: "",
},
performUpdateIdx: {
defaultValue: false,
description: "Update the current binary and restart the service in case it's installed.",
long: "update",
short: "",
valueType: "",
},
verboseIdx: {
defaultValue: false,
description: "Enable verbose logging.",
long: "verbose",
short: "v",
valueType: "",
},
versionIdx: {
defaultValue: false,
description: `Print the version to stdout and quit. ` +
`Print a more detailed version description with -v.`,
long: "version",
short: "",
valueType: "",
},
}
// parseOptions parses the command-line options for AdGuardHome.
func parseOptions(cmdName string, args []string) (opts *options, err error) {
flags := flag.NewFlagSet(cmdName, flag.ContinueOnError)
opts = &options{}
for i, fieldPtr := range []any{
confFileIdx: &opts.confFile,
logFileIdx: &opts.logFile,
pidFileIdx: &opts.pidFile,
serviceActionIdx: &opts.serviceAction,
workDirIdx: &opts.workDir,
webAddrIdx: &opts.webAddr,
checkConfigIdx: &opts.checkConfig,
disableUpdateIdx: &opts.disableUpdate,
glinetModeIdx: &opts.glinetMode,
helpIdx: &opts.help,
localFrontend: &opts.localFrontend,
performUpdateIdx: &opts.performUpdate,
verboseIdx: &opts.verbose,
versionIdx: &opts.version,
} {
addOption(flags, fieldPtr, commandLineOptions[i])
}
flags.Usage = func() { usage(cmdName, os.Stderr) }
err = flags.Parse(args)
if err != nil {
// Don't wrap the error, because it's informative enough as is.
return nil, err
}
return opts, nil
}
// addOption adds the command-line option described by o to flags using fieldPtr
// as the pointer to the value.
func addOption(flags *flag.FlagSet, fieldPtr any, o *commandLineOption) {
switch fieldPtr := fieldPtr.(type) {
case *string:
flags.StringVar(fieldPtr, o.long, o.defaultValue.(string), o.description)
if o.short != "" {
flags.StringVar(fieldPtr, o.short, o.defaultValue.(string), o.description)
}
case *bool:
flags.BoolVar(fieldPtr, o.long, o.defaultValue.(bool), o.description)
if o.short != "" {
flags.BoolVar(fieldPtr, o.short, o.defaultValue.(bool), o.description)
}
case encoding.TextUnmarshaler:
flags.TextVar(fieldPtr, o.long, o.defaultValue.(encoding.TextMarshaler), o.description)
if o.short != "" {
flags.TextVar(fieldPtr, o.short, o.defaultValue.(encoding.TextMarshaler), o.description)
}
default:
panic(fmt.Errorf("unexpected field pointer type %T", fieldPtr))
}
}
// usage prints a usage message similar to the one printed by package flag but
// taking long vs. short versions into account as well as using more informative
// value hints.
func usage(cmdName string, output io.Writer) {
options := slices.Clone(commandLineOptions)
slices.SortStableFunc(options, func(a, b *commandLineOption) (res int) {
return strings.Compare(a.long, b.long)
})
b := &strings.Builder{}
_, _ = fmt.Fprintf(b, "Usage of %s:\n", cmdName)
for _, o := range options {
writeUsageLine(b, o)
// Use four spaces before the tab to trigger good alignment for both 4-
// and 8-space tab stops.
if shouldIncludeDefault(o.defaultValue) {
_, _ = fmt.Fprintf(b, " \t%s (Default value: %q)\n", o.description, o.defaultValue)
} else {
_, _ = fmt.Fprintf(b, " \t%s\n", o.description)
}
}
_, _ = io.WriteString(output, b.String())
}
// shouldIncludeDefault returns true if this default value should be printed.
func shouldIncludeDefault(v any) (ok bool) {
switch v := v.(type) {
case bool:
return v
case string:
return v != ""
default:
return v == nil
}
}
// writeUsageLine writes the usage line for the provided command-line option.
func writeUsageLine(b *strings.Builder, o *commandLineOption) {
if o.short == "" {
if o.valueType == "" {
_, _ = fmt.Fprintf(b, " --%s\n", o.long)
} else {
_, _ = fmt.Fprintf(b, " --%s=%s\n", o.long, o.valueType)
}
return
}
if o.valueType == "" {
_, _ = fmt.Fprintf(b, " --%s/-%s\n", o.long, o.short)
} else {
_, _ = fmt.Fprintf(b, " --%[1]s=%[3]s/-%[2]s %[3]s\n", o.long, o.short, o.valueType)
}
}
// processOptions decides if AdGuard Home should exit depending on the results
// of command-line option parsing.
func processOptions(
opts *options,
cmdName string,
parseErr error,
) (exitCode int, needExit bool) {
if parseErr != nil {
// Assume that usage has already been printed.
return statusArgumentError, true
}
if opts.help {
usage(cmdName, os.Stdout)
return statusSuccess, true
}
if opts.version {
if opts.verbose {
fmt.Print(version.Verbose(configmigrate.LastSchemaVersion))
} else {
fmt.Printf("AdGuard Home %s\n", version.Version())
}
return statusSuccess, true
}
if opts.checkConfig {
err := configmgr.Validate(opts.confFile)
if err != nil {
_, _ = io.WriteString(os.Stdout, err.Error()+"\n")
return statusError, true
}
return statusSuccess, true
}
return 0, false
}
// frontendFromOpts returns the frontend to use based on the options.
func frontendFromOpts(opts *options, embeddedFrontend fs.FS) (frontend fs.FS, err error) {
const frontendSubdir = "build/static"
if opts.localFrontend {
log.Info("warning: using local frontend files")
return os.DirFS(frontendSubdir), nil
}
return fs.Sub(embeddedFrontend, frontendSubdir)
}