How to use WriteFile method of osutil Package

Best Syzkaller code snippet using osutil.WriteFile

synctree_test.go

Source:synctree_test.go

...34}35func (s *EnsureTreeStateSuite) TestVerifiesExpectedFiles(c *C) {36	c.Assert(os.MkdirAll(filepath.Join(s.dir, "foo", "bar"), 0755), IsNil)37	name := filepath.Join(s.dir, "foo", "bar", "expected.snap")38	c.Assert(ioutil.WriteFile(name, []byte("expected"), 0600), IsNil)39	changed, removed, err := osutil.EnsureTreeState(s.dir, s.globs, map[string]map[string]osutil.FileState{40		"foo/bar": {41			"expected.snap": &osutil.MemoryFileState{Content: []byte("expected"), Mode: 0600},42		},43	})44	c.Assert(err, IsNil)45	c.Check(changed, HasLen, 0)46	c.Check(removed, HasLen, 0)47	// The content and permissions are correct48	c.Check(name, testutil.FileEquals, "expected")49	stat, err := os.Stat(name)50	c.Assert(err, IsNil)51	c.Check(stat.Mode().Perm(), Equals, os.FileMode(0600))52}53func (s *EnsureTreeStateSuite) TestCreatesMissingFiles(c *C) {54	c.Assert(os.MkdirAll(filepath.Join(s.dir, "foo"), 0755), IsNil)55	changed, removed, err := osutil.EnsureTreeState(s.dir, s.globs, map[string]map[string]osutil.FileState{56		"foo": {57			"missing1.snap": &osutil.MemoryFileState{Content: []byte(`content-1`), Mode: 0600},58		},59		"bar": {60			"missing2.snap": &osutil.MemoryFileState{Content: []byte(`content-2`), Mode: 0600},61		},62	})63	c.Assert(err, IsNil)64	c.Check(changed, DeepEquals, []string{"bar/missing2.snap", "foo/missing1.snap"})65	c.Check(removed, HasLen, 0)66}67func (s *EnsureTreeStateSuite) TestRemovesUnexpectedFiles(c *C) {68	c.Assert(os.MkdirAll(filepath.Join(s.dir, "foo"), 0755), IsNil)69	c.Assert(os.MkdirAll(filepath.Join(s.dir, "bar"), 0755), IsNil)70	name1 := filepath.Join(s.dir, "foo", "evil1.snap")71	name2 := filepath.Join(s.dir, "bar", "evil2.snap")72	c.Assert(ioutil.WriteFile(name1, []byte(`evil-1`), 0600), IsNil)73	c.Assert(ioutil.WriteFile(name2, []byte(`evil-2`), 0600), IsNil)74	changed, removed, err := osutil.EnsureTreeState(s.dir, s.globs, map[string]map[string]osutil.FileState{75		"foo": {},76	})77	c.Assert(err, IsNil)78	c.Check(changed, HasLen, 0)79	c.Check(removed, DeepEquals, []string{"bar/evil2.snap", "foo/evil1.snap"})80	c.Check(name1, testutil.FileAbsent)81	c.Check(name2, testutil.FileAbsent)82}83func (s *EnsureTreeStateSuite) TestRemovesEmptyDirectories(c *C) {84	c.Assert(os.MkdirAll(filepath.Join(s.dir, "foo"), 0755), IsNil)85	c.Assert(os.MkdirAll(filepath.Join(s.dir, "bar", "baz"), 0755), IsNil)86	name1 := filepath.Join(s.dir, "foo", "file1.snap")87	name2 := filepath.Join(s.dir, "foo", "unrelated")88	name3 := filepath.Join(s.dir, "bar", "baz", "file2.snap")89	c.Assert(ioutil.WriteFile(name1, []byte(`text`), 0600), IsNil)90	c.Assert(ioutil.WriteFile(name2, []byte(`text`), 0600), IsNil)91	c.Assert(ioutil.WriteFile(name3, []byte(`text`), 0600), IsNil)92	_, _, err := osutil.EnsureTreeState(s.dir, s.globs, nil)93	c.Assert(err, IsNil)94	// The "foo" directory is still present, while the "bar" tree95	// has been removed.96	c.Check(filepath.Join(s.dir, "foo"), testutil.FilePresent)97	c.Check(filepath.Join(s.dir, "bar"), testutil.FileAbsent)98}99func (s *EnsureTreeStateSuite) TestIgnoresUnrelatedFiles(c *C) {100	c.Assert(os.MkdirAll(filepath.Join(s.dir, "foo"), 0755), IsNil)101	name := filepath.Join(s.dir, "foo", "unrelated")102	err := ioutil.WriteFile(name, []byte(`text`), 0600)103	c.Assert(err, IsNil)104	changed, removed, err := osutil.EnsureTreeState(s.dir, s.globs, map[string]map[string]osutil.FileState{})105	c.Assert(err, IsNil)106	// Report says that nothing has changed107	c.Check(changed, HasLen, 0)108	c.Check(removed, HasLen, 0)109	// The file is still there110	c.Check(name, testutil.FilePresent)111}112func (s *EnsureTreeStateSuite) TestErrorsOnBadGlob(c *C) {113	_, _, err := osutil.EnsureTreeState(s.dir, []string{"["}, nil)114	c.Check(err, ErrorMatches, `internal error: EnsureTreeState got invalid pattern "\[": syntax error in pattern`)115}116func (s *EnsureTreeStateSuite) TestErrorsOnDirectoryPathsMatchingGlobs(c *C) {117	_, _, err := osutil.EnsureTreeState(s.dir, s.globs, map[string]map[string]osutil.FileState{118		"foo/bar.snap/baz": nil,119	})120	c.Check(err, ErrorMatches, `internal error: EnsureTreeState got path "foo/bar.snap/baz" that matches glob pattern "\*.snap"`)121}122func (s *EnsureTreeStateSuite) TestErrorsOnFilenamesWithSlashes(c *C) {123	_, _, err := osutil.EnsureTreeState(s.dir, s.globs, map[string]map[string]osutil.FileState{124		"foo": {125			"dir/file1.snap": &osutil.MemoryFileState{Content: []byte(`content-1`), Mode: 0600},126		},127	})128	c.Check(err, ErrorMatches, `internal error: EnsureTreeState got filename "dir/file1.snap" in "foo", which has a path component`)129}130func (s *EnsureTreeStateSuite) TestErrorsOnFilenamesNotMatchingGlobs(c *C) {131	_, _, err := osutil.EnsureTreeState(s.dir, s.globs, map[string]map[string]osutil.FileState{132		"foo": {133			"file1.not-snap": &osutil.MemoryFileState{Content: []byte(`content-1`), Mode: 0600},134		},135	})136	c.Check(err, ErrorMatches, `internal error: EnsureTreeState got filename "file1.not-snap" in "foo", which doesn't match any glob patterns \["\*.snap"\]`)137}138func (s *EnsureTreeStateSuite) TestRemovesFilesOnError(c *C) {139	c.Assert(os.MkdirAll(filepath.Join(s.dir, "foo"), 0755), IsNil)140	c.Assert(os.MkdirAll(filepath.Join(s.dir, "bar", "dir.snap"), 0755), IsNil)141	name1 := filepath.Join(s.dir, "foo", "file1.snap")142	name2 := filepath.Join(s.dir, "bar", "file2.snap")143	name3 := filepath.Join(s.dir, "bar", "dir.snap", "sentinel")144	c.Assert(ioutil.WriteFile(name1, []byte(`text`), 0600), IsNil)145	c.Assert(ioutil.WriteFile(name2, []byte(`text`), 0600), IsNil)146	c.Assert(ioutil.WriteFile(name3, []byte(`text`), 0600), IsNil)147	changed, removed, err := osutil.EnsureTreeState(s.dir, s.globs, map[string]map[string]osutil.FileState{148		"foo": {149			"file1.snap": &osutil.MemoryFileState{Content: []byte(`content-1`), Mode: 0600},150		},151	})152	c.Check(err, ErrorMatches, `remove .*/bar/dir.snap: directory not empty`)153	c.Check(changed, HasLen, 0)154	c.Check(removed, DeepEquals, []string{"bar/file2.snap", "foo/file1.snap"})155	// Matching files have been removed, along with the empty directory156	c.Check(name1, testutil.FileAbsent)157	c.Check(filepath.Dir(name1), testutil.FileAbsent)158	c.Check(name2, testutil.FileAbsent)159	// But the unmatched file in the bad directory remains160	c.Check(name3, testutil.FilePresent)...

akaros.go

Source:akaros.go

...12)13type akaros struct{}14func (ctx akaros) build(params *Params) error {15	configFile := filepath.Join(params.KernelDir, ".config")16	if err := osutil.WriteFile(configFile, params.Config); err != nil {17		return fmt.Errorf("failed to write config file: %v", err)18	}19	if err := osutil.SandboxChown(configFile); err != nil {20		return err21	}22	sshkey := filepath.Join(params.KernelDir, "key")23	sshkeyPub := sshkey + ".pub"24	os.Remove(sshkey)25	os.Remove(sshkeyPub)26	if _, err := osutil.RunCmd(10*time.Minute, "", "ssh-keygen", "-t", "rsa", "-b", "2048",27		"-N", "", "-C", "", "-f", sshkey); err != nil {28		return err29	}30	if err := osutil.SandboxChown(sshkeyPub); err != nil {31		return err32	}33	if err := ctx.make(params.KernelDir, "", "olddefconfig", "ARCH=x86"); err != nil {34		return err35	}36	if err := ctx.make(params.KernelDir, "", "xcc"); err != nil {37		return err38	}39	if err := ctx.make(params.KernelDir, "tools/dev-libs/elfutils", "install"); err != nil {40		return err41	}42	if err := ctx.make(params.KernelDir, "", "apps-install"); err != nil {43		return err44	}45	if err := ctx.make(params.KernelDir, "", "fill-kfs"); err != nil {46		return err47	}48	targetKey := filepath.Join(params.KernelDir, "kern", "kfs", ".ssh", "authorized_keys")49	if err := osutil.Rename(sshkeyPub, targetKey); err != nil {50		return err51	}52	const init = `#!/bin/bash53/ifconfig54dropbear -F 2>db_out &55bash56`57	initFile := filepath.Join(params.KernelDir, "kern", "kfs", "init.sh")58	if err := osutil.WriteFile(initFile, []byte(init)); err != nil {59		return fmt.Errorf("failed to write init script: %v", err)60	}61	if err := osutil.SandboxChown(initFile); err != nil {62		return err63	}64	if err := os.Chmod(initFile, 0770); err != nil {65		return err66	}67	if err := ctx.cmd(params.KernelDir, "dropbear", "./CONFIGURE_AKAROS"); err != nil {68		return err69	}70	if err := ctx.make(params.KernelDir, "dropbear/build"); err != nil {71		return err72	}73	if err := ctx.make(params.KernelDir, "dropbear/build", "install"); err != nil {74		return err75	}76	if err := ctx.make(params.KernelDir, ""); err != nil {77		return err78	}79	if err := osutil.WriteFile(filepath.Join(params.OutputDir, "image"), nil); err != nil {80		return fmt.Errorf("failed to write image file: %v", err)81	}82	for src, dst := range map[string]string{83		".config":                    "kernel.config",84		"key":                        "key",85		"obj/kern/akaros-kernel":     "kernel",86		"obj/kern/akaros-kernel-64b": "obj/akaros-kernel-64b",87	} {88		fullSrc := filepath.Join(params.KernelDir, filepath.FromSlash(src))89		fullDst := filepath.Join(params.OutputDir, filepath.FromSlash(dst))90		if err := osutil.CopyFile(fullSrc, fullDst); err != nil {91			return fmt.Errorf("failed to copy %v: %v", src, err)92		}93	}...

WriteFile

Using AI Code Generation

1import (2func main() {3    file, err := os.Create("test.txt")4    if err != nil {5        fmt.Println(err)6    }7    defer file.Close()8    _, err = file.WriteString("Hello World")9    if err != nil {10        fmt.Println(err)11        file.Close()12    }13    err = file.Sync()14    if err != nil {15        fmt.Println(err)16        file.Close()17    }18    bs, err := ioutil.ReadFile("test.txt")19    if err != nil {20        fmt.Println(err)21    }22    str := string(bs)23    fmt.Println(str)24}25import (26func main() {27    file, err := os.OpenFile("test.txt", os.O_APPEND|os.O_WRONLY, 0644)28    if err != nil {29        fmt.Println(err)30    }31    defer file.Close()32    _, err = file.WriteString("Hello World")33    if err != nil {34        fmt.Println(err)35        file.Close()36    }37    err = file.Sync()38    if err != nil {39        fmt.Println(err)40        file.Close()41    }42    bs, err := ioutil.ReadFile("test.txt")43    if err != nil {44        fmt.Println(err)45    }46    str := string(bs)47    fmt.Println(str)48}49import (50func main() {51    file, err := os.Open("test.txt")52    if err != nil {53        fmt.Println(err)54    }55    defer file.Close()56    bs, err := ioutil.ReadFile("test.txt")57    if err != nil {58        fmt.Println(err)59    }

WriteFile

Using AI Code Generation

1import (2func main() {3	str := []byte("This is a test file")4	err := ioutil.WriteFile("test.txt", str, 0644)5	if err != nil {6		fmt.Println(err)7	}8}9import (10func main() {11	str := []byte("This is a test file")12	err := ioutil.WriteFile("test.txt", str, 0644)13	if err != nil {14		fmt.Println(err)15	}16	err = ioutil.WriteFile("test.txt", []byte("17	if err != nil {18		fmt.Println(err)19	}20}21import (22func main() {23	str := []byte("This is a test file")24	err := ioutil.WriteFile("test.txt", str, 0644)25	if err != nil {26		fmt.Println(err)27	}28	data, err := ioutil.ReadFile("test.txt")29	if err != nil {30		fmt.Println(err)31	}32	fmt.Println(string(data))33}34import (35func main() {36	str := []byte("This is a test file")37	err := ioutil.WriteFile("test.txt", str, 0644)38	if err != nil {39		fmt.Println(err)40	}41	files, err := ioutil.ReadDir(".")42	if err != nil {43		fmt.Println(err)44	}45	for _, file := range files {46		fmt.Println(file.Name

WriteFile

Using AI Code Generation

1import (2func main() {3	f, err := os.Create("file1.txt")4	if err != nil {5		fmt.Println(err)6	}7	defer f.Close()8	f.WriteString("This is my first file creation program in golang")9	f, err = os.Open("file1.txt")10	if err != nil {11		fmt.Println(err)12	}13	defer f.Close()14	bs := make([]byte, 100)15	n, err := f.Read(bs)16	if err != nil {17		fmt.Println(err)18	}19	fmt.Println("number of bytes read: ", n)20	str := string(bs)21	fmt.Println(str)22}23func WriteFile(filename string, data []byte, perm os.FileMode) error24import (25func main() {26	err := os.WriteFile("file2.txt", []byte("This is my second file creation program in golang"), 0644)27	if err != nil {28		fmt.Println(err)29	}30	f, err := os.Open("file2.txt")31	if err != nil {32		fmt.Println(err)33	}34	defer f.Close()35	bs := make([]byte, 100)36	n, err := f.Read(bs)37	if err != nil {38		fmt.Println(err)

WriteFile

Using AI Code Generation

1import (2func main() {3    f, err := os.Create("test.txt")4    if err != nil {5        fmt.Println(err)6    }7    l, err := f.WriteString("Hello World8    if err != nil {9        fmt.Println(err)10        f.Close()11    }12    fmt.Println(l, "bytes written successfully")13    l, err = f.WriteString("Writing data in file using golang14    if err != nil {15        fmt.Println(err)16        f.Close()17    }18    fmt.Println(l, "bytes written successfully")19    l, err = f.WriteString("WriteString method of File type")20    if err != nil {21        fmt.Println(err)22        f.Close()23    }24    fmt.Println(l, "bytes written successfully")25    err = f.Close()26    if err != nil {27        fmt.Println(err)28    }29    data, err := ioutil.ReadFile("test.txt")30    if err != nil {31        fmt.Println(err)32    }33    fmt.Println("Contents of file:", string(data))34    err = os.Mkdir("subdir", 0755)35    if err != nil {36        fmt.Println(err)37    }38    f, err = os.Create(filepath.Join("subdir", "test.txt"))39    if err != nil {40        fmt.Println(err)41    }42    l, err = f.WriteString("Hello World43    if err != nil {44        fmt.Println(err)45        f.Close()46    }47    fmt.Println(l, "bytes written successfully")48    l, err = f.WriteString("Writing data in file using golang49    if err != nil {50        fmt.Println(err)51        f.Close()52    }53    fmt.Println(l, "bytes written successfully")54    l, err = f.WriteString("WriteString method of File type")55    if err != nil {56        fmt.Println(err)57        f.Close()

WriteFile

Using AI Code Generation

1import (2func main() {3	err := ioutil.WriteFile("test.txt", []byte("Hello World"), 0644)4	if err != nil {5		fmt.Println(err)6	}7}8func ReadFile(filename string) ([]byte, error)9import (10func main() {11	data, err := ioutil.ReadFile("test.txt")12	if err != nil {13		fmt.Println(err)14	}15	fmt.Println(string(data))16}17func ReadDir(dirname string) ([]os.FileInfo, error)18import (19func main() {20	dir, err := ioutil.ReadDir("./")21	if err != nil {22		fmt.Println(err)23	}24	for _, d := range dir {25		fmt.Println(d.Name())26	}27}

WriteFile

Using AI Code Generation

1import (2func main() {3	fmt.Println("Creating a file using writefile method of osutil class")4	data := []byte("Hello World")5	err := ioutil.WriteFile("test.txt", data, 0644)6	if err != nil {7		panic(err)8	}9}

WriteFile

Using AI Code Generation

1import (2func main() {3	err := ioutil.WriteFile("test.txt", []byte(data), 0644)4	if err != nil {5		log.Fatal(err)6	}7}8import (9func main() {10	data, err := ioutil.ReadFile("test.txt")11	if err != nil {12		log.Fatal(err)13	}14	text := string(data)15	fmt.Println(text)16}17import (18func main() {19	err := ioutil.WriteFile("test.txt", []byte(data), 0644)20	if err != nil {21		log.Fatal(err)22	}23}24import (25func main() {26	data, err := ioutil.ReadFile("test.txt")27	if err != nil {28		log.Fatal(err)29	}30	text := string(data)31	fmt.Println(text)32}

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