111 lines
2.4 KiB
Go
111 lines
2.4 KiB
Go
package main
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import (
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"context"
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"fmt"
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"os"
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"os/signal"
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"path/filepath"
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"syscall"
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"github.com/adrg/xdg"
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"dev.mediocregopher.com/mediocre-go-lib.git/mctx"
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"dev.mediocregopher.com/mediocre-go-lib.git/mlog"
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)
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// The purpose of this binary is to act as the entrypoint of the isle
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// process. It processes the command-line arguments which are passed in, and
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// then passes execution along to an appropriate binary housed in AppDir/bin
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// (usually a bash script, which is more versatile than a go program).
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func getAppDirPath() string {
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appDirPath := os.Getenv("APPDIR")
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if appDirPath == "" {
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appDirPath = "."
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}
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return appDirPath
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}
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func getRPCSocketDirPath() string {
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path, err := firstExistingDir(
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"/run",
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"/var/run",
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"/tmp",
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"/dev/shm",
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)
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if err != nil {
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panic(fmt.Sprintf("Failed to find directory for RPC socket: %v", err))
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}
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return path
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}
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// RUNTIME_DIRECTORY/STATE_DIRECTORY are used by the systemd service in
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// conjunction with the RuntimeDirectory/StateDirectory directives.
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var (
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envAppDirPath = getAppDirPath()
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envRuntimeDirPath = envOr(
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"RUNTIME_DIRECTORY",
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func() string { return filepath.Join(xdg.RuntimeDir, "isle") },
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)
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envStateDirPath = envOr(
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"STATE_DIRECTORY",
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func() string { return filepath.Join(xdg.StateHome, "isle") },
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)
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envBinDirPath = filepath.Join(envAppDirPath, "bin")
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envSocketPath = envOr(
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"ISLE_SOCKET_PATH",
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func() string {
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return filepath.Join(getRPCSocketDirPath(), "isle-daemon.sock")
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},
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)
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)
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func binPath(name string) string {
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return filepath.Join(envBinDirPath, name)
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}
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func main() {
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logger := mlog.NewLogger(&mlog.LoggerOpts{
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MessageHandler: newLogMsgHandler(),
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MaxLevel: mlog.LevelInfo.Int(),
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})
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defer logger.Close()
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ctx, cancel := context.WithCancel(context.Background())
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signalCh := make(chan os.Signal, 2)
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signal.Notify(signalCh, syscall.SIGINT, syscall.SIGTERM)
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go func() {
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sig := <-signalCh
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cancel()
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ctx := mctx.Annotate(ctx, "signal", sig.String())
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logger.Info(ctx, "got signal, exiting gracefully")
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sig = <-signalCh
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ctx = mctx.Annotate(ctx, "signal", sig.String())
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logger.FatalString(ctx, "second signal received, force quitting, there may be zombie children left behind, good luck!")
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}()
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err := subCmdCtx{
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args: os.Args[1:],
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ctx: ctx,
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logger: logger,
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}.doSubCmd(
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subCmdAdmin,
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subCmdDaemon,
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subCmdGarage,
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subCmdHosts,
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subCmdNebula,
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subCmdVersion,
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)
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if err != nil {
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logger.Fatal(ctx, "error running command", err)
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}
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}
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