go-judge/envexec/file_util_linux.go
criyle 7f663ba0fd
Some checks failed
Build / Goreleaser (push) Has been cancelled
Build / Upload artifacts-${{ matrix.os }}-${{ matrix.arch }} (amd64_v3, darwin) (push) Has been cancelled
Build / Upload artifacts-${{ matrix.os }}-${{ matrix.arch }} (amd64_v3, linux) (push) Has been cancelled
Build / Upload artifacts-${{ matrix.os }}-${{ matrix.arch }} (amd64_v3, windows) (push) Has been cancelled
Build / Upload artifacts-${{ matrix.os }}-${{ matrix.arch }} (arm64_v8.0, darwin) (push) Has been cancelled
Build / Upload artifacts-${{ matrix.os }}-${{ matrix.arch }} (arm64_v8.0, linux) (push) Has been cancelled
Build / Upload artifacts-${{ matrix.os }}-${{ matrix.arch }} (arm64_v8.0, windows) (push) Has been cancelled
refactor(envexec): normalize error messages
2025-05-25 22:44:50 -04:00

89 lines
1.9 KiB
Go

package envexec
import (
"fmt"
"io"
"os"
"sync/atomic"
"syscall"
"github.com/criyle/go-sandbox/pkg/memfd"
)
const memfdName = "input"
var enableMemFd atomic.Int32
func readerToFile(reader io.Reader) (*os.File, error) {
if enableMemFd.Load() == 0 {
f, err := memfd.DupToMemfd(memfdName, reader)
if err == nil {
return f, err
}
enableMemFd.Store(1)
}
r, w, err := os.Pipe()
if err != nil {
return nil, err
}
go func() {
defer w.Close()
w.ReadFrom(reader)
}()
return r, nil
}
func copyDir(src *os.File, dst string) error {
// make sure dir exists
if err := os.MkdirAll(dst, 0777); err != nil {
return err
}
newDir, err := os.Open(dst)
if err != nil {
return err
}
defer newDir.Close()
dir := src
names, err := dir.Readdirnames(-1)
if err != nil {
return err
}
for _, n := range names {
if err := copyFileDir(int(dir.Fd()), int(newDir.Fd()), n); err != nil {
return err
}
}
return nil
}
func copyFileDir(srcDirFd, dstDirFd int, name string) error {
// open the source file
fd, err := syscall.Openat(srcDirFd, name, syscall.O_CLOEXEC|syscall.O_RDONLY, 0777)
if err != nil {
return fmt.Errorf("copyfiledir: openat src %q: %w", name, err)
}
defer syscall.Close(fd)
var st syscall.Stat_t
if err := syscall.Fstat(fd, &st); err != nil {
return fmt.Errorf("copyfiledir: fstat %q: %w", name, err)
}
if st.Mode&syscall.S_IFREG == 0 {
return fmt.Errorf("copyfiledir: %q is not a regular file", name)
}
// open the dst file
dstFd, err := syscall.Openat(dstDirFd, name, syscall.O_CLOEXEC|syscall.O_WRONLY|syscall.O_CREAT|syscall.O_TRUNC, 0777)
if err != nil {
return fmt.Errorf("copyfiledir: openat dst %q: %w", name, err)
}
defer syscall.Close(dstFd)
// send file, ignore error for now if it is dir
if _, err := syscall.Sendfile(dstFd, fd, nil, int(st.Size)); err != nil && err != syscall.EINVAL {
return fmt.Errorf("copyfiledir: sendfile %q: %w", name, err)
}
return nil
}