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// Copyright 2013 Canonical Ltd.
// Licensed under the AGPLv3, see LICENCE file for details.
package utils_test
import (
"fmt"
"io/ioutil"
"os"
"os/user"
"path/filepath"
jc "github.com/juju/testing/checkers"
gc "launchpad.net/gocheck"
"launchpad.net/juju-core/juju/osenv"
"launchpad.net/juju-core/utils"
)
type fileSuite struct {
oldHome string
}
var _ = gc.Suite(&fileSuite{})
func (s *fileSuite) SetUpTest(c *gc.C) {
s.oldHome = osenv.Home()
err := osenv.SetHome("/home/test-user")
c.Assert(err, gc.IsNil)
}
func (s *fileSuite) TearDownTest(c *gc.C) {
err := osenv.SetHome(s.oldHome)
c.Assert(err, gc.IsNil)
}
func (*fileSuite) TestNormalizePath(c *gc.C) {
currentUser, err := user.Current()
c.Assert(err, gc.IsNil)
for _, test := range []struct {
path string
expected string
err string
}{{
path: "/var/lib/juju",
expected: "/var/lib/juju",
}, {
path: "~/foo",
expected: "/home/test-user/foo",
}, {
path: "~/foo//../bar",
expected: "/home/test-user/bar",
}, {
path: "~",
expected: "/home/test-user",
}, {
path: "~" + currentUser.Username,
expected: currentUser.HomeDir,
}, {
path: "~" + currentUser.Username + "/foo",
expected: currentUser.HomeDir + "/foo",
}, {
path: "~" + currentUser.Username + "/foo//../bar",
expected: currentUser.HomeDir + "/bar",
}, {
path: "~foobar/path",
err: "user: unknown user foobar",
}} {
actual, err := utils.NormalizePath(test.path)
if test.err != "" {
c.Check(err, gc.ErrorMatches, test.err)
} else {
c.Check(err, gc.IsNil)
c.Check(actual, gc.Equals, test.expected)
}
}
}
func (*fileSuite) TestCopyFile(c *gc.C) {
dir := c.MkDir()
f, err := ioutil.TempFile(dir, "source")
c.Assert(err, gc.IsNil)
defer f.Close()
_, err = f.Write([]byte("hello world"))
c.Assert(err, gc.IsNil)
dest := filepath.Join(dir, "dest")
err = utils.CopyFile(dest, f.Name())
c.Assert(err, gc.IsNil)
data, err := ioutil.ReadFile(dest)
c.Assert(err, gc.IsNil)
c.Assert(string(data), gc.Equals, "hello world")
}
var atomicWriteFileTests = []struct {
summary string
change func(filename string, contents []byte) error
check func(c *gc.C, fileInfo os.FileInfo)
expectErr string
}{{
summary: "atomic file write and chmod 0644",
change: func(filename string, contents []byte) error {
return utils.AtomicWriteFile(filename, contents, 0765)
},
check: func(c *gc.C, fi os.FileInfo) {
c.Assert(fi.Mode(), gc.Equals, 0765)
},
}, {
summary: "atomic file write and change",
change: func(filename string, contents []byte) error {
chmodChange := func(f *os.File) error {
return f.Chmod(0700)
}
return utils.AtomicWriteFileAndChange(filename, contents, chmodChange)
},
check: func(c *gc.C, fi os.FileInfo) {
c.Assert(fi.Mode(), gc.Equals, 0700)
},
}, {
summary: "atomic file write empty contents",
change: func(filename string, contents []byte) error {
nopChange := func(*os.File) error {
return nil
}
return utils.AtomicWriteFileAndChange(filename, contents, nopChange)
},
}, {
summary: "atomic file write and failing change func",
change: func(filename string, contents []byte) error {
errChange := func(*os.File) error {
return fmt.Errorf("pow!")
}
return utils.AtomicWriteFileAndChange(filename, contents, errChange)
},
expectErr: "pow!",
}}
func (*fileSuite) TestAtomicWriteFile(c *gc.C) {
dir := c.MkDir()
name := "test.file"
path := filepath.Join(dir, name)
assertDirContents := func(names ...string) {
fis, err := ioutil.ReadDir(dir)
c.Assert(err, gc.IsNil)
c.Assert(fis, gc.HasLen, len(names))
for i, name := range names {
c.Assert(fis[i].Name(), gc.Equals, name)
}
}
assertNotExist := func(path string) {
_, err := os.Lstat(path)
c.Assert(err, jc.Satisfies, os.IsNotExist)
}
for i, test := range atomicWriteFileTests {
c.Logf("test %d: %s", i, test.summary)
// First - test with file not already there.
assertDirContents()
assertNotExist(path)
contents := []byte("some\ncontents")
err := test.change(path, contents)
if test.expectErr == "" {
c.Assert(err, gc.IsNil)
data, err := ioutil.ReadFile(path)
c.Assert(err, gc.IsNil)
c.Assert(data, jc.DeepEquals, contents)
assertDirContents(name)
} else {
c.Assert(err, gc.ErrorMatches, test.expectErr)
assertDirContents()
continue
}
// Second - test with a file already there.
contents = []byte("new\ncontents")
err = test.change(path, contents)
c.Assert(err, gc.IsNil)
data, err = ioutil.ReadFile(path)
c.Assert(err, gc.IsNil)
c.Assert(data, jc.DeepEquals, contents)
assertDirContents(name)
// Remove the file to reset scenario.
c.Assert(os.Remove(path), gc.IsNil)
}
}
func (*fileSuite) TestIsNotExist(c *gc.C) {
dir := c.MkDir()
path := func(s string) string { return filepath.Join(dir, s) }
err := ioutil.WriteFile(path("file"), []byte("blah"), 0644)
c.Assert(err, gc.IsNil)
_, err = os.Lstat(path("noexist"))
c.Assert(err, jc.Satisfies, utils.IsNotExist)
_, err = os.Lstat(path("file/parent-not-a-dir"))
c.Assert(err, jc.Satisfies, utils.IsNotExist)
}
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