// +build !windows

package archive

import (
	"bytes"
	"fmt"
	"io/ioutil"
	"os"
	"path/filepath"
	"runtime"
	"syscall"
	"testing"

	"github.com/containers/storage/pkg/idtools"
	"github.com/containers/storage/pkg/system"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
	"golang.org/x/sys/unix"
)

func TestCanonicalTarNameForPath(t *testing.T) {
	cases := []struct{ in, expected string }{
		{"foo", "foo"},
		{"foo/bar", "foo/bar"},
		{"foo/dir/", "foo/dir/"},
	}
	for _, v := range cases {
		if out, err := CanonicalTarNameForPath(v.in); err != nil {
			t.Fatalf("cannot get canonical name for path: %s: %v", v.in, err)
		} else if out != v.expected {
			t.Fatalf("wrong canonical tar name. expected:%s got:%s", v.expected, out)
		}
	}
}

func TestCanonicalTarName(t *testing.T) {
	cases := []struct {
		in       string
		isDir    bool
		expected string
	}{
		{"foo", false, "foo"},
		{"foo", true, "foo/"},
		{"foo/bar", false, "foo/bar"},
		{"foo/bar", true, "foo/bar/"},
	}
	for _, v := range cases {
		if out, err := canonicalTarName(v.in, v.isDir); err != nil {
			t.Fatalf("cannot get canonical name for path: %s: %v", v.in, err)
		} else if out != v.expected {
			t.Fatalf("wrong canonical tar name. expected:%s got:%s", v.expected, out)
		}
	}
}

func TestChmodTarEntry(t *testing.T) {
	cases := []struct {
		in, expected os.FileMode
	}{
		{0000, 0000},
		{0777, 0777},
		{0644, 0644},
		{0755, 0755},
		{0444, 0444},
	}
	for _, v := range cases {
		if out := chmodTarEntry(v.in); out != v.expected {
			t.Fatalf("wrong chmod. expected:%v got:%v", v.expected, out)
		}
	}
}

func TestTarWithHardLink(t *testing.T) {
	origin, err := ioutil.TempDir("", "storage-test-tar-hardlink")
	require.NoError(t, err)
	defer os.RemoveAll(origin)

	err = ioutil.WriteFile(filepath.Join(origin, "1"), []byte("hello world"), 0700)
	require.NoError(t, err)

	err = os.Link(filepath.Join(origin, "1"), filepath.Join(origin, "2"))
	require.NoError(t, err)

	var i1, i2 uint64
	i1, err = getNlink(filepath.Join(origin, "1"))
	require.NoError(t, err)

	// sanity check that we can hardlink
	if i1 != 2 {
		t.Skipf("skipping since hardlinks don't work here; expected 2 links, got %d", i1)
	}

	dest, err := ioutil.TempDir("", "storage-test-tar-hardlink-dest")
	require.NoError(t, err)
	defer os.RemoveAll(dest)

	// we'll do this in two steps to separate failure
	fh, err := Tar(origin, Uncompressed)
	require.NoError(t, err)

	// ensure we can read the whole thing with no error, before writing back out
	buf, err := ioutil.ReadAll(fh)
	require.NoError(t, err)

	bRdr := bytes.NewReader(buf)
	err = Untar(bRdr, dest, &TarOptions{Compression: Uncompressed})
	require.NoError(t, err)

	i1, err = getInode(filepath.Join(dest, "1"))
	require.NoError(t, err)

	i2, err = getInode(filepath.Join(dest, "2"))
	require.NoError(t, err)

	assert.Equal(t, i1, i2)
}

func TestTarWithHardLinkAndRebase(t *testing.T) {
	tmpDir, err := ioutil.TempDir("", "storage-test-tar-hardlink-rebase")
	require.NoError(t, err)
	defer os.RemoveAll(tmpDir)

	origin := filepath.Join(tmpDir, "origin")
	err = os.Mkdir(origin, 0700)
	require.NoError(t, err)

	err = ioutil.WriteFile(filepath.Join(origin, "1"), []byte("hello world"), 0700)
	require.NoError(t, err)

	err = os.Link(filepath.Join(origin, "1"), filepath.Join(origin, "2"))
	require.NoError(t, err)

	var i1, i2 uint64
	i1, err = getNlink(filepath.Join(origin, "1"))
	require.NoError(t, err)

	// sanity check that we can hardlink
	if i1 != 2 {
		t.Skipf("skipping since hardlinks don't work here; expected 2 links, got %d", i1)
	}

	dest := filepath.Join(tmpDir, "dest")
	bRdr, err := TarResourceRebase(origin, "origin")
	require.NoError(t, err)

	dstDir, srcBase := SplitPathDirEntry(origin)
	_, dstBase := SplitPathDirEntry(dest)
	content := RebaseArchiveEntries(bRdr, srcBase, dstBase)
	err = Untar(content, dstDir, &TarOptions{Compression: Uncompressed, NoLchown: true, NoOverwriteDirNonDir: true})
	require.NoError(t, err)

	i1, err = getInode(filepath.Join(dest, "1"))
	require.NoError(t, err)
	i2, err = getInode(filepath.Join(dest, "2"))
	require.NoError(t, err)

	assert.Equal(t, i1, i2)
}

func getNlink(path string) (uint64, error) {
	stat, err := os.Stat(path)
	if err != nil {
		return 0, err
	}
	statT, ok := stat.Sys().(*syscall.Stat_t)
	if !ok {
		return 0, fmt.Errorf("expected type *syscall.Stat_t, got %t", stat.Sys())
	}
	// We need this conversion on ARM64
	return uint64(statT.Nlink), nil
}

func getInode(path string) (uint64, error) {
	stat, err := os.Stat(path)
	if err != nil {
		return 0, err
	}
	statT, ok := stat.Sys().(*syscall.Stat_t)
	if !ok {
		return 0, fmt.Errorf("expected type *syscall.Stat_t, got %t", stat.Sys())
	}
	return statT.Ino, nil
}

func TestTarWithBlockCharFifo(t *testing.T) {
	origin, err := ioutil.TempDir("", "storage-test-tar-hardlink")
	require.NoError(t, err)

	defer os.RemoveAll(origin)
	err = ioutil.WriteFile(filepath.Join(origin, "1"), []byte("hello world"), 0700)
	require.NoError(t, err)

	err = system.Mknod(filepath.Join(origin, "2"), unix.S_IFBLK, int(system.Mkdev(int64(12), int64(5))))
	require.NoError(t, err)
	err = system.Mknod(filepath.Join(origin, "3"), unix.S_IFCHR, int(system.Mkdev(int64(12), int64(5))))
	require.NoError(t, err)
	err = system.Mknod(filepath.Join(origin, "4"), unix.S_IFIFO, int(system.Mkdev(int64(12), int64(5))))
	require.NoError(t, err)

	dest, err := ioutil.TempDir("", "storage-test-tar-hardlink-dest")
	require.NoError(t, err)
	defer os.RemoveAll(dest)

	// we'll do this in two steps to separate failure
	fh, err := Tar(origin, Uncompressed)
	require.NoError(t, err)

	// ensure we can read the whole thing with no error, before writing back out
	buf, err := ioutil.ReadAll(fh)
	require.NoError(t, err)

	bRdr := bytes.NewReader(buf)
	err = Untar(bRdr, dest, &TarOptions{Compression: Uncompressed})
	require.NoError(t, err)

	changes, err := ChangesDirs(origin, &idtools.IDMappings{}, dest, &idtools.IDMappings{})
	require.NoError(t, err)

	if len(changes) > 0 {
		t.Fatalf("Tar with special device (block, char, fifo) should keep them (recreate them when untar) : %v", changes)
	}
}

// TestTarUntarWithXattr is Unix as Lsetxattr is not supported on Windows
func TestTarUntarWithXattr(t *testing.T) {
	if runtime.GOOS == "solaris" {
		t.Skip()
	}
	origin, err := ioutil.TempDir("", "storage-test-untar-origin")
	require.NoError(t, err)
	defer os.RemoveAll(origin)
	err = ioutil.WriteFile(filepath.Join(origin, "1"), []byte("hello world"), 0700)
	require.NoError(t, err)

	err = ioutil.WriteFile(filepath.Join(origin, "2"), []byte("welcome!"), 0700)
	require.NoError(t, err)
	err = ioutil.WriteFile(filepath.Join(origin, "3"), []byte("will be ignored"), 0700)
	require.NoError(t, err)
	encoded := [20]byte{0, 0, 0, 2}
	err = system.Lsetxattr(filepath.Join(origin, "2"), "security.capability", encoded[:], 0)
	require.NoError(t, err)

	for _, c := range []Compression{
		Uncompressed,
		Gzip,
	} {
		changes, err := tarUntar(t, origin, &TarOptions{
			Compression:     c,
			ExcludePatterns: []string{"3"},
		})

		if err != nil {
			t.Fatalf("Error tar/untar for compression %s: %s", c.Extension(), err)
		}

		if len(changes) != 1 || changes[0].Path != "/3" {
			t.Fatalf("Unexpected differences after tarUntar: %v", changes)
		}
		capability, _ := system.Lgetxattr(filepath.Join(origin, "2"), "security.capability")
		if capability == nil && capability[0] != 0x00 {
			t.Fatalf("Untar should have kept the 'security.capability' xattr.")
		}
	}
}
