github.com/rkt/rkt@v1.30.1-0.20200224141603-171c416fac02/tests/stub-stage1/run/main.go (about)

     1  // Copyright 2016 The rkt Authors
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package main
    16  
    17  import (
    18  	"fmt"
    19  	"os"
    20  
    21  	"github.com/rkt/rkt/common"
    22  	"github.com/rkt/rkt/pkg/sys"
    23  	stage1common "github.com/rkt/rkt/stage1/common"
    24  )
    25  
    26  func main() {
    27  	os.Exit(run())
    28  }
    29  
    30  func run() int {
    31  	lfd, err := common.GetRktLockFD()
    32  	if err != nil {
    33  		fmt.Fprintf(os.Stderr, "Failed to get rkt lock fd: %v\n", err)
    34  		return 254
    35  	}
    36  
    37  	if err := sys.CloseOnExec(lfd, true); err != nil {
    38  		fmt.Fprintf(os.Stderr, "Failed to set FD_CLOEXEC on rkt lock: %v\n", err)
    39  		return 254
    40  	}
    41  
    42  	if err := stage1common.WritePid(os.Getpid(), "ppid"); err != nil {
    43  		fmt.Fprintf(os.Stderr, "write ppid: %v", err)
    44  		return 254
    45  	}
    46  	fmt.Println("success, stub stage1 would at this point switch to stage2")
    47  	return 0
    48  }