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main.go
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main.go
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// Copyright 2022 The Sigstore Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package main
import (
"fmt"
"log"
"net"
"net/rpc"
"os"
"path/filepath"
"syscall"
"github.com/coreos/go-systemd/v22/activation"
"github.com/spf13/pflag"
"github.com/sigstore/gitsign/internal/cache/service"
"github.com/sigstore/gitsign/pkg/version"
)
var (
// Action flags
versionFlag = pflag.BoolP("version", "v", false, "print the version number")
systemdFlag = pflag.Bool("systemd-socket-activation", false, "use systemd socket activation")
)
func main() {
pflag.Parse()
// Override default umask so created files are always scoped to the
// current user.
syscall.Umask(0077)
if *versionFlag {
v := version.GetVersionInfo()
fmt.Printf("gitsign-credential-cache version %s\n", v.GitVersion)
os.Exit(0)
}
var connChan = make(chan net.Conn)
if *systemdFlag {
// Stop if we're not running under systemd.
if os.Getenv("LISTEN_PID") == "" {
log.Fatalf("systemd socket activation requested but not running under systemd")
}
listeners, err := activation.Listeners()
if err != nil {
log.Fatalf("error getting systemd listeners: %v", err)
}
var validCount int
for _, l := range listeners {
if l == nil {
continue
}
fmt.Println(l.Addr().String())
go connToChan(l, connChan)
validCount++
}
if validCount == 0 {
log.Fatalf("no valid systemd listeners found")
}
} else {
user, err := os.UserCacheDir()
if err != nil {
log.Fatalf("error getting user cache directory: %v", err)
}
dir := filepath.Join(user, "sigstore", "gitsign")
if err := os.MkdirAll(dir, 0700); err != nil {
log.Fatalf("error creating %s: %v", dir, err)
}
path := filepath.Join(dir, "cache.sock")
if _, err := os.Stat(path); err == nil {
os.Remove(path)
}
fmt.Println(path)
l, err := net.Listen("unix", path)
if err != nil {
log.Fatalf("error opening socket: %v", err)
}
go connToChan(l, connChan)
}
srv := rpc.NewServer()
if err := srv.Register(service.NewService()); err != nil {
log.Fatalf("error registering RPC service: %v", err)
}
for conn := range connChan {
go srv.ServeConn(conn)
}
}
func connToChan(l net.Listener, connChan chan net.Conn) {
for {
conn, err := l.Accept()
if err != nil {
log.Fatalf("error accepting connection: %v", err)
}
connChan <- conn
}
}