func (S) TestLineIsolatesEnv(c *C) {
p := pipe.Line(
pipe.SetEnvVar("PIPE_VAR", "outer"),
pipe.Line(
pipe.SetEnvVar("PIPE_VAR", "inner"),
),
pipe.System("echo $PIPE_VAR"),
)
output, err := pipe.Output(p)
c.Assert(err, IsNil)
c.Assert(string(output), Equals, "outer\n")
}
func (S) TestLineNesting(c *C) {
b := &bytes.Buffer{}
p := pipe.Line(
pipe.Print("hello"),
pipe.Line(
pipe.Filter(func(line []byte) bool { return true }),
pipe.Exec("sed", "s/l/k/g"),
),
pipe.Write(b),
)
err := pipe.Run(p)
c.Assert(err, IsNil)
c.Assert(b.String(), Equals, "hekko")
}
func (S) TestLineIsolatesDir(c *C) {
dir1 := c.MkDir()
dir2 := c.MkDir()
p := pipe.Line(
pipe.ChDir(dir1),
pipe.Line(
pipe.ChDir(dir2),
),
pipe.System("echo $PWD"),
)
output, err := pipe.Output(p)
c.Assert(err, IsNil)
c.Assert(string(output), Equals, dir1+"\n")
}
// Pipe connects the output of one Executable to the input of the next
// Executable in the list. The result is an Executable that, when run, returns
// the output of the last Executable run, and any error it might have had.
//
// If any of the Executables fails, no further Executables are run, and the
// failing Executable's stderr and error are returned.
func Pipe(cmds ...Executable) Executable {
ps := make([]pipe.Pipe, len(cmds))
for i, c := range cmds {
ps[i] = c.Pipe
}
return Executable{pipe.Line(ps...)}
}
// PipeWith functions like Pipe, but runs the first command with stdin as the
// input.
func PipeWith(stdin string, cmds ...Executable) Executable {
ps := make([]pipe.Pipe, len(cmds)+1)
ps[0] = pipe.Read(strings.NewReader(stdin))
for i, c := range cmds {
ps[i+1] = c.Pipe
}
return Executable{pipe.Line(ps...)}
}
func (S) TestFilter(c *C) {
p := pipe.Line(
pipe.System("echo out1; echo err1 1>&2; echo out2; echo err2 1>&2; echo out3"),
pipe.Filter(func(line []byte) bool { return string(line) != "out2" }),
)
output, err := pipe.Output(p)
c.Assert(err, IsNil)
c.Assert(string(output), Equals, "out1\nout3\n")
}
func (S) TestRead(c *C) {
p := pipe.Line(
pipe.Read(bytes.NewBufferString("hello")),
pipe.Exec("sed", "s/l/k/g"),
)
output, err := pipe.Output(p)
c.Assert(err, IsNil)
c.Assert(string(output), Equals, "hekko")
}
func (S) TestPrintf(c *C) {
p := pipe.Line(
pipe.Printf("hello:%d", 42),
pipe.Exec("sed", "s/l/k/g"),
)
output, err := pipe.Output(p)
c.Assert(err, IsNil)
c.Assert(string(output), Equals, "hekko:42")
}
func (S) TestFilterNoNewLine(c *C) {
p := pipe.Line(
pipe.Print("out1\nout2\nout3"),
pipe.Filter(func(line []byte) bool { return string(line) != "out2" }),
)
output, err := pipe.Output(p)
c.Assert(err, IsNil)
c.Assert(string(output), Equals, "out1\nout3")
}
func (S) TestLine(c *C) {
p := pipe.Line(
pipe.Exec("/bin/sh", "-c", "echo out1; echo err1 1>&2; echo out2; echo err2 1>&2"),
pipe.Exec("sed", `s/\(...\)\([12]\)/\1-\2/`),
)
output, err := pipe.CombinedOutput(p)
c.Assert(err, IsNil)
c.Assert(string(output), Equals, "err1\nerr2\nout-1\nout-2\n")
}
func (S) TestReadFileNonExistent(c *C) {
path := filepath.Join(c.MkDir(), "file")
p := pipe.Line(
pipe.ReadFile(path),
pipe.Exec("cat"),
)
output, err := pipe.Output(p)
c.Assert(err, ErrorMatches, "open .*/file: no such file or directory")
c.Assert(output, IsNil)
}
func (S) TestDiscard(c *C) {
p := pipe.Line(
pipe.Print("hello"),
pipe.Discard(),
pipe.Print("world"),
)
output, err := pipe.Output(p)
c.Assert(err, IsNil)
c.Assert(string(output), Equals, "world")
}
func (S) TestAppendFileAbsolute(c *C) {
path := filepath.Join(c.MkDir(), "file")
p := pipe.Script(
pipe.Line(
pipe.Print("hello "),
pipe.AppendFile(path, 0600),
),
pipe.Line(
pipe.Print("world!"),
pipe.AppendFile(path, 0600),
),
)
output, err := pipe.Output(p)
c.Assert(err, IsNil)
c.Assert(string(output), Equals, "")
data, err := ioutil.ReadFile(path)
c.Assert(err, IsNil)
c.Assert(string(data), Equals, "hello world!")
}
func (S) TestScriptPreservesStreams(c *C) {
p := pipe.Script(
pipe.Line(
pipe.Print("hello\n"),
pipe.Discard(),
),
pipe.Exec("echo", "world"),
)
output, err := pipe.Output(p)
c.Assert(err, IsNil)
c.Assert(string(output), Equals, "world\n")
}
func (S) TestTee(c *C) {
var b bytes.Buffer
p := pipe.Line(
pipe.Print("hello"),
pipe.Exec("sed", "s/l/k/g"),
pipe.Tee(&b),
)
output, err := pipe.Output(p)
c.Assert(err, IsNil)
c.Assert(string(output), Equals, "hekko")
c.Assert(b.String(), Equals, "hekko")
}
func (S) TestTeeAppendFileMode(c *C) {
path := filepath.Join(c.MkDir(), "file")
p := pipe.Line(
pipe.Print("hello"),
pipe.TeeAppendFile(path, 0600),
)
err := pipe.Run(p)
c.Assert(err, IsNil)
stat, err := os.Stat(path)
c.Assert(err, IsNil)
c.Assert(stat.Mode()&os.ModePerm, Equals, os.FileMode(0600))
}
func (S) TestTeeAppendFileRelative(c *C) {
dir := c.MkDir()
path := filepath.Join(dir, "file")
p := pipe.Script(
pipe.ChDir(dir),
pipe.Line(
pipe.Print("hello "),
pipe.TeeAppendFile("file", 0600),
),
pipe.Line(
pipe.Print("world!"),
pipe.TeeAppendFile("file", 0600),
),
)
output, err := pipe.Output(p)
c.Assert(err, IsNil)
c.Assert(string(output), Equals, "hello world!")
data, err := ioutil.ReadFile(path)
c.Assert(err, IsNil)
c.Assert(string(data), Equals, "hello world!")
}
func (S) TestLineTermination(c *C) {
// Shouldn't block waiting for a reader that won't read.
var b []byte
for i := 0; i < 256*1024/8; i++ {
b = append(b, "xxxxxxxx"...)
}
p := pipe.Line(
pipe.Print(string(b)),
pipe.Exec("true"),
)
output, err := pipe.Output(p)
c.Assert(err, ErrorMatches, `command "true": write \|1: broken pipe`)
c.Assert(string(output), Equals, "")
}
func (S) TestScriptNesting(c *C) {
b := &bytes.Buffer{}
p := pipe.Line(
pipe.Print("hello"),
pipe.Script(
pipe.Print("world"),
pipe.Exec("sed", "s/l/k/g"),
),
pipe.Write(b),
)
err := pipe.Run(p)
c.Assert(err, IsNil)
c.Assert(b.String(), Equals, "worldhekko")
}
func (S) TestReadFileRelative(c *C) {
dir := c.MkDir()
path := filepath.Join(dir, "file")
err := ioutil.WriteFile(path, []byte("hello"), 0644)
c.Assert(err, IsNil)
p := pipe.Line(
pipe.ReadFile(path),
pipe.Exec("sed", "s/l/k/g"),
)
output, err := pipe.Output(p)
c.Assert(err, IsNil)
c.Assert(string(output), Equals, "hekko")
}
func (S) TestTeeAppendFileAbsolute(c *C) {
path := filepath.Join(c.MkDir(), "file")
p := pipe.Script(
pipe.Line(
pipe.Print("hello "),
pipe.TeeAppendFile(path, 0600),
),
pipe.Line(
pipe.Print("world!"),
pipe.TeeAppendFile(path, 0600),
),
)
output, err := pipe.Output(p)
c.Assert(err, IsNil)
c.Assert(string(output), Equals, "hello world!")
data, err := ioutil.ReadFile(path)
c.Assert(err, IsNil)
c.Assert(string(data), Equals, "hello world!")
stat, err := os.Stat(path)
c.Assert(err, IsNil)
c.Assert(stat.Mode()&os.ModePerm, Equals, os.FileMode(0600))
}
func (S) TestWriteFileAbsolute(c *C) {
path := filepath.Join(c.MkDir(), "file")
p := pipe.Line(
pipe.Print("hello"),
pipe.Exec("sed", "s/l/k/g"),
pipe.WriteFile(path, 0600),
)
output, err := pipe.Output(p)
c.Assert(err, IsNil)
c.Assert(string(output), Equals, "")
data, err := ioutil.ReadFile(path)
c.Assert(err, IsNil)
c.Assert(string(data), Equals, "hekko")
}
func findCommandOutput(cmd []string, c chan []Searchresult) {
results := make([]Searchresult, 0)
line := pipe.Line(
pipe.Exec("find", cmd...),
pipe.Exec("head", "-10"),
)
output, err := pipe.Output(line)
if err != nil {
panic(err)
}
split := strings.Split(string(output), "\n")
for _, i := range split {
results = append(results, *NewSearchResult(i))
}
c <- results
}
func (S) TestReplaceNoNewLine(c *C) {
p := pipe.Line(
pipe.Print("out1\nout2\nout3"),
pipe.Replace(func(line []byte) []byte {
if bytes.HasPrefix(line, []byte("out")) {
if line[3] == '2' {
return nil
}
return []byte{'l', line[3], ','}
}
return line
}),
)
output, err := pipe.Output(p)
c.Assert(err, IsNil)
c.Assert(string(output), Equals, "l1,l3,")
}
func (S) TestReplace(c *C) {
p := pipe.Line(
pipe.System("echo out1; echo err1 1>&2; echo out2; echo err2 1>&2; echo out3"),
pipe.Replace(func(line []byte) []byte {
if bytes.HasPrefix(line, []byte("out")) {
if line[3] == '3' {
return nil
}
return []byte{'l', line[3], ','}
}
return line
}),
)
output, err := pipe.Output(p)
c.Assert(err, IsNil)
c.Assert(string(output), Equals, "l1,l2,")
}
func (S) TestTeeWriteFileRelative(c *C) {
dir := c.MkDir()
path := filepath.Join(dir, "file")
p := pipe.Line(
pipe.ChDir(dir),
pipe.Print("hello"),
pipe.Exec("sed", "s/l/k/g"),
pipe.TeeWriteFile("file", 0600),
)
output, err := pipe.Output(p)
c.Assert(err, IsNil)
c.Assert(string(output), Equals, "hekko")
data, err := ioutil.ReadFile(path)
c.Assert(err, IsNil)
c.Assert(string(data), Equals, "hekko")
}
func (S) TestTeeWriteFileAbsolute(c *C) {
path := filepath.Join(c.MkDir(), "file")
p := pipe.Line(
pipe.Print("hello"),
pipe.Exec("sed", "s/l/k/g"),
pipe.TeeWriteFile(path, 0600),
)
output, err := pipe.Output(p)
c.Assert(err, IsNil)
c.Assert(string(output), Equals, "hekko")
data, err := ioutil.ReadFile(path)
c.Assert(err, IsNil)
c.Assert(string(data), Equals, "hekko")
stat, err := os.Stat(path)
c.Assert(err, IsNil)
c.Assert(stat.Mode()&os.ModePerm, Equals, os.FileMode(0600))
}
func (S) TestErrorHandling(c *C) {
sync := make(chan bool)
p := pipe.Script(
pipe.Line(
pipe.TaskFunc(func(*pipe.State) error {
sync <- true
return fmt.Errorf("err1")
}),
pipe.TaskFunc(func(*pipe.State) error {
<-sync
return fmt.Errorf("err2")
}),
),
pipe.Print("never happened"),
)
output, err := pipe.Output(p)
if err.Error() != "err1; err2" && err.Error() != "err2; err1" {
c.Fatalf(`want "err1; err2" or "err2; err1"; got %q`, err.Error())
}
c.Assert(string(output), Equals, "")
}
// RunWith executes the command with the given string as standard input, and
// returns stdout and a nil error on success, or stderr and a non-nil error on
// failure.
func (c Executable) RunWith(stdin string) (string, error) {
out, err := pipe.CombinedOutput(
pipe.Line(pipe.Read(strings.NewReader(stdin)), c.Pipe),
)
return string(out), err
}