forked from moby/buildkit
/
util.go
128 lines (112 loc) · 2.2 KB
/
util.go
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package integration
import (
"bytes"
"context"
"net"
"os"
"os/exec"
"strings"
"syscall"
"time"
"github.com/pkg/errors"
"golang.org/x/sync/errgroup"
)
func startCmd(cmd *exec.Cmd, logs map[string]*bytes.Buffer) (func() error, error) {
if logs != nil {
b := new(bytes.Buffer)
logs["stdout: "+cmd.Path] = b
cmd.Stdout = b
b = new(bytes.Buffer)
logs["stderr: "+cmd.Path] = b
cmd.Stderr = b
}
if err := cmd.Start(); err != nil {
return nil, err
}
eg, ctx := errgroup.WithContext(context.TODO())
stopped := make(chan struct{})
stop := make(chan struct{})
eg.Go(func() error {
_, err := cmd.Process.Wait()
close(stopped)
select {
case <-stop:
return nil
default:
return err
}
})
eg.Go(func() error {
select {
case <-ctx.Done():
case <-stopped:
case <-stop:
cmd.Process.Signal(syscall.SIGTERM)
go func() {
select {
case <-stopped:
case <-time.After(20 * time.Second):
cmd.Process.Kill()
}
}()
}
return nil
})
return func() error {
close(stop)
return eg.Wait()
}, nil
}
func waitUnix(address string, d time.Duration) error {
address = strings.TrimPrefix(address, "unix://")
addr, err := net.ResolveUnixAddr("unix", address)
if err != nil {
return err
}
step := 50 * time.Millisecond
i := 0
for {
if conn, err := net.DialUnix("unix", nil, addr); err == nil {
conn.Close()
break
}
i++
if time.Duration(i)*step > d {
return errors.Errorf("failed dialing: %s", address)
}
time.Sleep(step)
}
return nil
}
type multiCloser struct {
fns []func() error
}
func (mc *multiCloser) F() func() error {
return func() error {
var err error
for i := range mc.fns {
if err1 := mc.fns[len(mc.fns)-1-i](); err == nil {
err = err1
}
}
mc.fns = nil
return err
}
}
func (mc *multiCloser) append(f func() error) {
mc.fns = append(mc.fns, f)
}
var ErrorRequirements = errors.Errorf("missing requirements")
func lookupBinary(name string) error {
_, err := exec.LookPath(name)
if err != nil {
return errors.Wrapf(ErrorRequirements, "failed to lookup %s binary", name)
}
return nil
}
func requireRoot() error {
if os.Getuid() != 0 {
return errors.Wrap(ErrorRequirements, "requires root")
}
return nil
}