forked from purpleidea/mgmt
/
afero.go
136 lines (123 loc) · 3.45 KB
/
afero.go
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// Mgmt
// Copyright (C) 2013-2018+ James Shubin and the project contributors
// Written by James Shubin <james@shubin.ca> and the project contributors
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package util
import (
"fmt"
"io"
"os"
"path"
"github.com/spf13/afero"
)
// FsTree returns a string representation of the file system tree similar to the
// well-known `tree` command.
func FsTree(fs afero.Fs, name string) (string, error) {
str := ".\n" // top level dir
s, err := stringify(fs, path.Clean(name), []bool{})
if err != nil {
return "", err
}
str += s
return str, nil
}
func stringify(fs afero.Fs, name string, indent []bool) (string, error) {
str := ""
dir, err := fs.Open(name)
if err != nil {
return "", err
}
fileinfo, err := dir.Readdir(-1)
if err != nil && err != io.EOF {
return "", err
}
for i, fi := range fileinfo {
for _, last := range indent {
if last {
str += " "
} else {
str += "│ "
}
}
header := "├── "
var last bool
if i == len(fileinfo)-1 { // if last
header = "└── "
last = true
}
p := fi.Name()
if fi.IsDir() {
p += "/" // identify as a dir
}
str += fmt.Sprintf("%s%s\n", header, p)
if fi.IsDir() {
indented := append(indent, last)
s, err := stringify(fs, path.Join(name, p), indented)
if err != nil {
return "", err // TODO: return partial tree?
}
str += s
}
}
return str, nil
}
// CopyFs copies a dir from the srcFs to a dir on the dstFs. It expects that the
// dst will be either empty, or that the force flag will be set to true. If the
// dst has a different set of contents in the same location, the behaviour is
// currently undefined.
// TODO: this should be made more rsync like and robust!
func CopyFs(srcFs, dstFs afero.Fs, src, dst string, force bool) error {
if src == "" {
src = "/"
}
if dst == "" {
dst = "/"
}
walkFn := func(name string, info os.FileInfo, err error) error {
if err != nil {
return err
}
//perm := info.Perm()
perm := info.Mode() // TODO: is this correct?
p := name
if dst != "/" {
p = path.Join(dst, name) // relative dest in dst
}
if info.IsDir() {
err := dstFs.Mkdir(p, perm)
if os.IsExist(err) && (name == "/" || force) {
return nil
}
return err
}
data, err := afero.ReadFile(srcFs, name)
if err != nil {
return err
}
// create file
return afero.WriteFile(dstFs, p, data, perm)
}
return afero.Walk(srcFs, src, walkFn)
}
// CopyFsToDisk performs exactly as CopyFs, except that the dst fs is our local
// disk os fs.
func CopyFsToDisk(srcFs afero.Fs, src, dst string, force bool) error {
return CopyFs(srcFs, afero.NewOsFs(), src, dst, force)
}
// CopyDiskToFs performs exactly as CopyFs, except that the src fs is our local
// disk os fs.
func CopyDiskToFs(dstFs afero.Fs, src, dst string, force bool) error {
return CopyFs(afero.NewOsFs(), dstFs, src, dst, force)
}