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package xdelta
import (
"fmt"
"io"
"io/ioutil"
"os"
"os/exec"
"path"
"sync/atomic"
"golang.org/x/sys/unix"
)
var (
tmpDir = "/tmp"
srcSeq int64
)
type Program struct {
Path string
}
type Runner struct {
Testdir string
}
type Run struct {
Cmd exec.Cmd
Srcfile string
Stdin io.WriteCloser
Srcin io.WriteCloser
Stdout io.ReadCloser
Stderr io.ReadCloser
}
func NewRunner() (*Runner, error) {
if dir, err := ioutil.TempDir(tmpDir, "xrt"); err != nil {
return nil, err
} else {
return &Runner{dir}, nil
}
}
func (r *Runner) Cleanup() {
os.RemoveAll(r.Testdir)
}
func (r *Runner) Exec(p *Program, srcfifo bool, flags []string) (*Run, error) {
var err error
run := &Run{}
args := []string{p.Path}
if srcfifo {
num := atomic.AddInt64(&srcSeq, 1)
run.Srcfile = path.Join(r.Testdir, fmt.Sprint("source", num))
if err = unix.Mkfifo(run.Srcfile, 0600); err != nil {
return nil, err
}
// Because OpenFile blocks on the Fifo until the reader
// arrives, a pipe to defer open
read, write := io.Pipe()
run.Srcin = write
go writeFifo(run.Srcfile, read)
args = append(args, "-s")
args = append(args, run.Srcfile)
}
if run.Stdin, err = run.Cmd.StdinPipe(); err != nil {
return nil, err
}
if run.Stdout, err = run.Cmd.StdoutPipe(); err != nil {
return nil, err
}
if run.Stderr, err = run.Cmd.StderrPipe(); err != nil {
return nil, err
}
run.Cmd.Path = p.Path
run.Cmd.Args = append(args, flags...)
run.Cmd.Dir = r.Testdir
run.Cmd.Start()
return run, nil
}
func writeFifo(srcfile string, read io.Reader) {
fifo, err := os.OpenFile(srcfile, os.O_WRONLY, 0600)
if err != nil {
panic(err)
}
if _, err := io.Copy(fifo, read); err != nil {
panic(err)
}
if err := fifo.Close(); err != nil {
panic(err)
}
}
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