mirror of
https://github.com/netbirdio/gvisor.git
synced 2026-05-22 17:12:49 -07:00
Etienne Perot
9ca09375e4
This creates a `go_template` that can generate a `go_library` rule which extracts a compressed binary to a temporary location, then executes it. This is useful to implement `runsc` subcommands without requiring that these subcommands' dependencies are linked into the main `runsc` binary. PiperOrigin-RevId: 557270682
68 lines
1.9 KiB
Go
68 lines
1.9 KiB
Go
// Copyright 2023 The gVisor Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// helloworld_bundler bundles helloworld_bundlee and executes it.
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package main
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import (
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"fmt"
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"os"
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syscall "golang.org/x/sys/unix"
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"gvisor.dev/gvisor/tools/embeddedbinary/test/helloworld"
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)
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func doExec() {
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if err := helloworld.Exec(helloworld.Options{}); err != nil {
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fmt.Fprintf(os.Stderr, "Failed to exec embedded binary: %v\n", err)
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os.Exit(1)
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}
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fmt.Fprintf(os.Stderr, "Unreachable\n")
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os.Exit(1)
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}
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func doForkExec() {
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childPID, err := helloworld.ForkExec(helloworld.Options{
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// Share stdin/stdout/stderr with child process.
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Files: []uintptr{os.Stdin.Fd(), os.Stdout.Fd(), os.Stderr.Fd()},
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})
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if err != nil {
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fmt.Fprintf(os.Stderr, "Failed to fork+exec embedded binary: %v\n", err)
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os.Exit(1)
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}
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var waitStatus syscall.WaitStatus
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if _, err := syscall.Wait4(childPID, &waitStatus, 0, nil); err != nil {
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fmt.Fprintf(os.Stderr, "Failed to wait for child embedded binary: %v\n", err)
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os.Exit(1)
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}
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if status := waitStatus.ExitStatus(); status != 0 {
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fmt.Fprintf(os.Stderr, "Child embedded binary returned code %d\n", status)
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os.Exit(status)
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}
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os.Exit(0)
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}
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func main() {
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for _, arg := range os.Args {
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switch arg {
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case "--mode=exec":
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doExec()
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case "--mode=fork":
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doForkExec()
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}
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}
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fmt.Fprintf(os.Stderr, "Must specify either --mode=exec or --mode=fork.\n")
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os.Exit(1)
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}
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