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package syscallcompat
import (
"os"
"runtime"
"syscall"
"testing"
"golang.org/x/sys/unix"
)
func TestEmulateUnlinkat(t *testing.T) {
os.Mkdir(tmpDir+"/unlink1", 0700)
dirfd, err := os.Open(tmpDir + "/unlink1")
if err != nil {
t.Fatal(err)
}
defer dirfd.Close()
// Try to delete file
fd, err := os.Create(tmpDir + "/unlink1/f1")
if err != nil {
t.Fatal(err)
}
fd.Close()
err = emulateUnlinkat(int(dirfd.Fd()), "f1", 0)
if err != nil {
t.Fatal(err)
}
_, err = os.Stat(tmpDir + "/unlink1/f1")
if err == nil {
t.Fatalf("file not deleted!")
}
// Try to delete dir
err = os.Mkdir(tmpDir+"/unlink1/d1", 0700)
if err != nil {
t.Fatal(err)
}
err = emulateUnlinkat(int(dirfd.Fd()), "d1", 0)
if err == nil {
t.Fatalf("this should fail due to missing AT_REMOVEDIR flag")
}
err = emulateUnlinkat(int(dirfd.Fd()), "d1", unix.AT_REMOVEDIR)
if err != nil {
t.Fatal(err)
}
_, err = os.Stat(tmpDir + "/unlink1/d1")
if err == nil {
t.Fatalf("dir not deleted!")
}
// Test with absolute path
err = os.Mkdir(tmpDir+"/unlink1/d1", 0700)
if err != nil {
t.Fatal(err)
}
err = emulateUnlinkat(-1, tmpDir+"/unlink1/d1", unix.AT_REMOVEDIR)
if err != nil {
t.Fatal(err)
}
_, err = os.Stat(tmpDir + "/unlink1/d1")
if err == nil {
t.Fatalf("dir not deleted!")
}
}
func TestEmulateMknodat(t *testing.T) {
err := emulateMknodat(tmpDirFd, "fifo1", unix.S_IFIFO, 0)
if err != nil {
t.Fatal(err)
}
_, err = os.Stat(tmpDir + "/fifo1")
if err != nil {
t.Fatal(err)
}
// Test with absolute path
err = emulateMknodat(-1, tmpDir+"/fifo2", unix.S_IFIFO, 0)
if err != nil {
t.Fatal(err)
}
_, err = os.Stat(tmpDir + "/fifo2")
if err != nil {
t.Fatal(err)
}
}
func TestEmulateFchmodat(t *testing.T) {
fd, err := os.Create(tmpDir + "/chmod")
if err != nil {
t.Fatal(err)
}
err = fd.Chmod(0654)
if err != nil {
t.Fatal(err)
}
fd.Close()
// Chmod a normal file
err = emulateFchmodat(tmpDirFd, "chmod", 0600, 0)
if err != nil {
t.Fatal(err)
}
var st syscall.Stat_t
err = syscall.Lstat(tmpDir+"/chmod", &st)
if err != nil {
t.Fatal(err)
}
if st.Mode != 0100600 {
t.Fatalf("Wrong mode: have %o, want %o", st.Mode, 0100600)
}
// Chmod a symlink (original file should not change)
err = os.Symlink(tmpDir+"/chmod", tmpDir+"/chmodSymlink")
if err != nil {
t.Fatal(err)
}
err = emulateFchmodat(tmpDirFd, "chmodSymlink", 0123, unix.AT_SYMLINK_NOFOLLOW)
if err != nil {
t.Fatal(err)
}
err = syscall.Lstat(tmpDir+"/chmod", &st)
if err != nil {
t.Fatal(err)
}
if st.Mode != 0100600 {
t.Fatalf("Wrong mode: have %o, want %o", st.Mode, 0100600)
}
// Test with absolute path
err = emulateFchmodat(-1, tmpDir+"/chmod", 0400, 0)
if err != nil {
t.Fatal(err)
}
err = syscall.Lstat(tmpDir+"/chmod", &st)
if err != nil {
t.Fatal(err)
}
if st.Mode != 0100400 {
t.Fatalf("Wrong mode: have %o, want %o", st.Mode, 0100400)
}
}
func TestEmulateFchownat(t *testing.T) {
t.Skipf("TODO")
}
// symlinkCheckMode looks if the mode bits in "st" say that this is a symlink.
// Calls t.Fatal() if not.
func symlinkCheckMode(t *testing.T, st syscall.Stat_t) {
if runtime.GOOS == "darwin" {
// On MacOS, symlinks don't carry their own permissions, so
// only check the file type.
if st.Mode&syscall.S_IFMT != syscall.S_IFLNK {
t.Fatalf("This is not a symlink: mode = 0%o", st.Mode)
}
return
}
if st.Mode != 0120777 {
t.Fatalf("Wrong mode, have 0%o, want 0120777", st.Mode)
}
}
func TestEmulateSymlinkat(t *testing.T) {
err := emulateSymlinkat("/foo/bar/baz", tmpDirFd, "symlink1")
if err != nil {
t.Fatal(err)
}
var st syscall.Stat_t
err = syscall.Lstat(tmpDir+"/symlink1", &st)
if err != nil {
t.Fatal(err)
}
symlinkCheckMode(t, st)
// Test with absolute path
err = emulateSymlinkat("/foo/bar/baz", -1, tmpDir+"/symlink2")
if err != nil {
t.Fatal(err)
}
err = syscall.Lstat(tmpDir+"/symlink2", &st)
if err != nil {
t.Fatal(err)
}
symlinkCheckMode(t, st)
}
func TestEmulateMkdirat(t *testing.T) {
err := emulateMkdirat(tmpDirFd, "mkdirat", 0700)
if err != nil {
t.Fatal(err)
}
fi, err := os.Stat(tmpDir + "/mkdirat")
if err != nil {
t.Fatal(err)
}
if !fi.IsDir() {
t.Fatalf("mkdirat did not create a directory")
}
// Test with absolute path
err = emulateMkdirat(-1, tmpDir+"/mkdirat2", 0700)
if err != nil {
t.Fatal(err)
}
fi, err = os.Stat(tmpDir + "/mkdirat2")
if err != nil {
t.Fatal(err)
}
if !fi.IsDir() {
t.Fatalf("mkdirat did not create a directory")
}
}
func TestEmulateFstatat(t *testing.T) {
var st unix.Stat_t
// stat a normal file (size 3)
f, err := os.Create(tmpDir + "/fstatat")
if err != nil {
t.Fatal(err)
}
_, err = f.Write([]byte("foo"))
if err != nil {
t.Fatal(err)
}
f.Close()
err = emulateFstatat(tmpDirFd, "fstatat", &st, unix.AT_SYMLINK_NOFOLLOW)
if err != nil {
t.Fatal(err)
}
if st.Size != 3 {
t.Errorf("wrong file size: %d", st.Size)
}
// stat a symlink and check that the size matches the length of the
// symlink target. This proves that we have stat'ed the symlink itself.
err = os.Symlink(tmpDir+"/fstatat", tmpDir+"/fstatatSymlink")
if err != nil {
t.Fatal(err)
}
err = emulateFstatat(tmpDirFd, "fstatatSymlink", &st, unix.AT_SYMLINK_NOFOLLOW)
if err != nil {
t.Fatal(err)
}
expectedSize := int64(len(tmpDir + "/fstatat"))
if st.Size != expectedSize {
t.Errorf("symlink size: expected=%d, got=%d", expectedSize, st.Size)
}
}
|
