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package syscallcompat
import (
"bytes"
"os"
"syscall"
"testing"
)
func TestReadlinkat(t *testing.T) {
for _, targetLen := range []int{100, 500, 4000} {
target := string(bytes.Repeat([]byte("x"), targetLen))
err := syscall.Symlink(target, tmpDir+"/readlinkat")
if err != nil {
if targetLen > 1000 {
// Symlinks longer than 1024 (?) bytes are not supported on
// MacOS and XFS
t.Logf("skipping targetLen=%d: %v", targetLen, err)
continue
}
t.Fatalf("targetLen=%d: %v", targetLen, err)
}
target2, err := Readlinkat(tmpDirFd, "readlinkat")
if err != nil {
t.Fatal(err)
}
if target != target2 {
t.Errorf("target=%q != target2=%q", target, target2)
}
err = syscall.Unlink(tmpDir + "/readlinkat")
if err != nil {
t.Fatal(err)
}
}
}
func TestFchmodat(t *testing.T) {
regular := "TestFchmodat_Regular"
f, err := os.OpenFile(tmpDir+"/"+regular, os.O_CREATE|os.O_WRONLY, 0000)
if err != nil {
t.Fatal(err)
}
f.Close()
symlink := "TestFchmodat_Symlink"
err = syscall.Symlink(regular, tmpDir+"/"+symlink)
if err != nil {
t.Fatal(err)
}
dirfd, err := syscall.Open(tmpDir, syscall.O_RDONLY, 0)
if err != nil {
t.Fatal(err)
}
defer syscall.Close(dirfd)
// Check that chmod on a regular file works ok
err = Fchmodat(dirfd, regular, 0111, 0)
if err != nil {
t.Fatal(err)
}
var st syscall.Stat_t
syscall.Lstat(tmpDir+"/"+regular, &st)
st.Mode &= 0777
if st.Mode != 0111 {
t.Errorf("wrong mode: %#0o", st.Mode)
}
err = Fchmodat(dirfd, regular, 0000, 0)
if err != nil {
t.Error(err)
}
syscall.Lstat(tmpDir+"/"+regular, &st)
st.Mode &= 0777
if st.Mode != 0000 {
t.Errorf("wrong mode: %#0o", st.Mode)
}
// Check what happens on a symlink
err = Fchmodat(dirfd, symlink, 0333, 0)
if err == nil {
syscall.Lstat(tmpDir+"/"+symlink, &st)
st.Mode &= 0777
t.Errorf("chmod on symlink should have failed, but did not. New mode=%#0o", st.Mode)
}
syscall.Lstat(tmpDir+"/"+regular, &st)
st.Mode &= 0777
if st.Mode != 0000 {
t.Errorf("chmod on symlink affected symlink target: New mode=%#0o", st.Mode)
}
}
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