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ldd_test.go
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ldd_test.go
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// Copyright 2017-2018 the u-root Authors. All rights reserved
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package ldd
import (
"fmt"
"io/ioutil"
"os"
"strings"
"testing"
)
// TestLdd tests Ldd against /bin/date.
// This is just about guaranteed to have
// some output on most linux systems.
func TestLdd(t *testing.T) {
n, err := Ldd([]string{"/bin/date"})
if err != nil {
t.Fatalf("Ldd on /bin/date: want nil, got %v", err)
}
t.Logf("TestLdd: /bin/date has deps of")
for i := range n {
t.Logf("\t%v", n[i])
}
}
// lddOne is a helper that runs Ldd on one file. It returns
// the list so we can use elements from the list on another
// test. We do it this way because, unlike /bin/date, there's
// almost nothing else we can assume exists, e.g. /lib/libc.so
// is a different name on almost every *ix* system.
func lddOne(name string) ([]string, error) {
var libMap = make(map[string]bool)
n, err := Ldd([]string{name})
if err != nil {
return nil, fmt.Errorf("Ldd on %v: want nil, got %v", name, err)
}
l, err := List([]string{name})
if err != nil {
return nil, fmt.Errorf("LddList on %v: want nil, got %v", name, err)
}
if len(n) != len(l) {
return nil, fmt.Errorf("%v: Len of Ldd(%v) and LddList(%v): want same, got different", name, len(n), len(l))
}
for i := range n {
libMap[n[i].FullName] = true
}
for i := range n {
if !libMap[l[i]] {
return nil, fmt.Errorf("%v: %v was in LddList but not in Ldd", name, l[i])
}
}
return l, nil
}
// TestLddList tests that the LddList is the
// same as the info returned by Ldd
func TestLddList(t *testing.T) {
n, err := lddOne("/bin/date")
if err != nil {
t.Fatal(err)
}
// Find the first name in the array that contains "lib"
// Test 'em all
for _, f := range n {
if !strings.Contains(f, "lib") {
continue
}
t.Logf("Test %v", f)
n, err := lddOne(f)
if err != nil {
t.Error(err)
}
t.Logf("%v has deps of %v", f, n)
}
}
// This could have been a great test, if ld.so actually followed ITS OWN DOCS
// and used LD_LIBRARY_PATH. It doesn't.
func testLddBadSo(t *testing.T) {
tempDir, err := ioutil.TempDir("", "ldd")
if err != nil {
t.Fatalf("TempDir: %v", err)
}
defer os.RemoveAll(tempDir)
if err := os.Setenv("LD_LIBRARY_PATH", tempDir); err != nil {
t.Fatalf("Setting LDD_LIBRARY_PATH to %v: want nil, got %v", tempDir, err)
}
if _, err := Ldd([]string{"/bin/date"}); err == nil {
t.Fatalf("Ldd on /bin/date: want err, got nil")
}
t.Logf("Err on bad dir is %v", err)
}