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// +build linux
package syscallcompat
import (
"io/ioutil"
"os"
"runtime"
"strings"
"syscall"
"testing"
"golang.org/x/sys/unix"
"github.com/hanwen/go-fuse/v2/fuse"
)
var emulate = false
func TestGetdents(t *testing.T) {
t.Logf("testing native getdents")
testGetdents(t)
t.Logf("testing emulateGetdents")
emulate = true
testGetdents(t)
}
// skipOnGccGo skips the emulateGetdents test when we are
// running linux and were compiled with gccgo. The test is known to fail
// (https://github.com/rfjakob/gocryptfs/issues/201), but getdents emulation
// is not used on linux, so let's skip the test and ignore the failure.
func skipOnGccGo(t *testing.T) {
if !emulate || runtime.GOOS != "linux" {
return
}
// runtime.Version() output...
// on go: go1.9.2
// on gccgo: go1.8.1 gccgo (GCC) 7.2.1 20170915 (Red Hat 7.2.1-2)
v := runtime.Version()
if strings.Contains(v, "gccgo") {
t.Skipf("test is known-broken on gccgo")
}
}
func testGetdents(t *testing.T) {
getdentsUnderTest := getdents
if emulate {
getdentsUnderTest = emulateGetdents
}
// Fill a directory with filenames of length 1 ... 255
testDir, err := ioutil.TempDir(tmpDir, "TestGetdents")
if err != nil {
t.Fatal(err)
}
for i := 1; i <= unix.NAME_MAX; i++ {
n := strings.Repeat("x", i)
err = ioutil.WriteFile(testDir+"/"+n, nil, 0600)
if err != nil {
t.Fatal(err)
}
}
// "/", "/dev" and "/proc/self" are good test cases because they contain
// many different file types (block and char devices, symlinks,
// mountpoints).
dirs := []string{testDir, "/", "/dev", "/proc/self"}
for _, dir := range dirs {
// Read directory using stdlib Readdir()
fd, err := os.Open(dir)
if err != nil {
t.Fatal(err)
}
defer fd.Close()
readdirEntries, err := fd.Readdir(0)
if err != nil {
t.Fatal(err)
}
readdirMap := make(map[string]*syscall.Stat_t)
for _, v := range readdirEntries {
readdirMap[v.Name()] = fuse.ToStatT(v)
}
// Read using our Getdents() implementation
_, err = fd.Seek(0, 0) // Rewind directory
if err != nil {
t.Fatal(err)
}
getdentsEntries, special, err := getdentsUnderTest(int(fd.Fd()))
if err != nil {
t.Log(err)
skipOnGccGo(t)
t.FailNow()
}
getdentsMap := make(map[string]fuse.DirEntry)
for _, v := range getdentsEntries {
getdentsMap[v.Name] = v
}
// Compare results
if len(getdentsEntries) != len(readdirEntries) {
t.Fatalf("len(getdentsEntries)=%d, len(readdirEntries)=%d",
len(getdentsEntries), len(readdirEntries))
}
for name := range readdirMap {
g := getdentsMap[name]
r := readdirMap[name]
rTyp := r.Mode & syscall.S_IFMT
if g.Mode != rTyp {
t.Errorf("%q: g.Mode=%#o, r.Mode=%#o", name, g.Mode, rTyp)
}
if g.Ino != r.Ino {
// The inode number of a directory that is reported by stat
// and getdents is different when it is a mountpoint. Only
// throw an error when we are NOT looking at a directory.
if g.Mode != syscall.S_IFDIR {
t.Errorf("%s: g.Ino=%d, r.Ino=%d", name, g.Ino, r.Ino)
}
}
}
if len(special) != 2 {
t.Error(special)
}
if !(special[0].Name == "." && special[1].Name == ".." ||
special[1].Name == "." && special[0].Name == "..") {
t.Error(special)
}
for _, v := range special {
if v.Ino == 0 {
t.Error(v)
}
if v.Mode != syscall.S_IFDIR {
t.Error(v)
}
}
}
}
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