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filetesting.go
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filetesting.go
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// Copyright 2013, 2014 Canonical Ltd.
// Licensed under the LGPLv3, see LICENCE file for details.
package filetesting
import (
"io/ioutil"
"os"
"path/filepath"
"runtime"
jc "github.com/juju/testing/checkers"
gc "gopkg.in/check.v1"
)
// Entry represents a filesystem entity that can be created; and whose
// correctness can be verified.
type Entry interface {
// GetPath returns the slash-separated relative path that this
// entry represents.
GetPath() string
// Create causes the entry to be created, relative to basePath. It returns
// a copy of the receiver.
Create(c *gc.C, basePath string) Entry
// Check checks that the entry exists, relative to basePath, and matches
// the entry that would be created by Create. It returns a copy of the
// receiver.
Check(c *gc.C, basePath string) Entry
}
var (
_ Entry = Dir{}
_ Entry = File{}
_ Entry = Symlink{}
_ Entry = Removed{}
)
// Entries supplies convenience methods on Entry slices.
type Entries []Entry
// Paths returns the slash-separated path of every entry.
func (e Entries) Paths() []string {
result := make([]string, len(e))
for i, entry := range e {
result[i] = entry.GetPath()
}
return result
}
// Create creates every entry relative to basePath and returns a copy of itself.
func (e Entries) Create(c *gc.C, basePath string) Entries {
result := make([]Entry, len(e))
for i, entry := range e {
result[i] = entry.Create(c, basePath)
}
return result
}
// Check checks every entry relative to basePath and returns a copy of itself.
func (e Entries) Check(c *gc.C, basePath string) Entries {
result := make([]Entry, len(e))
for i, entry := range e {
result[i] = entry.Check(c, basePath)
}
return result
}
// AsRemoveds returns a slice of Removed entries whose paths correspond to
// those in e.
func (e Entries) AsRemoveds() Entries {
result := make([]Entry, len(e))
for i, entry := range e {
result[i] = Removed{entry.GetPath()}
}
return result
}
// join joins a slash-separated path to a filesystem basePath.
func join(basePath, path string) string {
return filepath.Join(basePath, filepath.FromSlash(path))
}
// Dir is an Entry that allows directories to be created and verified. The
// Path field should use "/" as the path separator.
type Dir struct {
Path string
Perm os.FileMode
}
func (d Dir) GetPath() string {
return d.Path
}
func (d Dir) Create(c *gc.C, basePath string) Entry {
path := join(basePath, d.Path)
err := os.MkdirAll(path, d.Perm)
c.Assert(err, gc.IsNil)
err = os.Chmod(path, d.Perm)
c.Assert(err, gc.IsNil)
return d
}
func (d Dir) Check(c *gc.C, basePath string) Entry {
path := join(basePath, d.Path)
fileInfo, err := os.Lstat(path)
comment := gc.Commentf("dir %q", path)
if !c.Check(err, gc.IsNil, comment) {
return d
}
// Skip until we implement proper permissions checking
if runtime.GOOS != "windows" {
c.Check(fileInfo.Mode()&os.ModePerm, gc.Equals, d.Perm, comment)
}
c.Check(fileInfo.Mode()&os.ModeType, gc.Equals, os.ModeDir, comment)
return d
}
// File is an Entry that allows plain files to be created and verified. The
// Path field should use "/" as the path separator.
type File struct {
Path string
Data string
Perm os.FileMode
}
func (f File) GetPath() string {
return f.Path
}
func (f File) Create(c *gc.C, basePath string) Entry {
path := join(basePath, f.Path)
err := ioutil.WriteFile(path, []byte(f.Data), f.Perm)
c.Assert(err, gc.IsNil)
err = os.Chmod(path, f.Perm)
c.Assert(err, gc.IsNil)
return f
}
func (f File) Check(c *gc.C, basePath string) Entry {
path := join(basePath, f.Path)
fileInfo, err := os.Lstat(path)
comment := gc.Commentf("file %q", path)
if !c.Check(err, gc.IsNil, comment) {
return f
}
// Skip until we implement proper permissions checking
if runtime.GOOS != "windows" {
mode := fileInfo.Mode()
c.Check(mode&os.ModeType, gc.Equals, os.FileMode(0), comment)
c.Check(mode&os.ModePerm, gc.Equals, f.Perm, comment)
}
data, err := ioutil.ReadFile(path)
c.Check(err, gc.IsNil, comment)
c.Check(string(data), gc.Equals, f.Data, comment)
return f
}
// Symlink is an Entry that allows symlinks to be created and verified. The
// Path field should use "/" as the path separator.
type Symlink struct {
Path string
Link string
}
func (s Symlink) GetPath() string {
return s.Path
}
func (s Symlink) Create(c *gc.C, basePath string) Entry {
err := os.Symlink(s.Link, join(basePath, s.Path))
c.Assert(err, gc.IsNil)
return s
}
func (s Symlink) Check(c *gc.C, basePath string) Entry {
path := join(basePath, s.Path)
comment := gc.Commentf("symlink %q", path)
link, err := os.Readlink(path)
c.Check(err, gc.IsNil, comment)
c.Check(link, gc.Equals, s.Link, comment)
return s
}
// Removed is an Entry that indicates the absence of any entry. The Path
// field should use "/" as the path separator.
type Removed struct {
Path string
}
func (r Removed) GetPath() string {
return r.Path
}
func (r Removed) Create(c *gc.C, basePath string) Entry {
err := os.RemoveAll(join(basePath, r.Path))
c.Assert(err, gc.IsNil)
return r
}
func (r Removed) Check(c *gc.C, basePath string) Entry {
path := join(basePath, r.Path)
_, err := os.Lstat(path)
// isNotExist allows us to handle the following case:
// File{"foo", ...}.Create(...)
// Removed{"foo/bar"}.Check(...)
// ...where os.IsNotExist would not work.
c.Check(err, jc.Satisfies, isNotExist, gc.Commentf("removed %q", path))
return r
}