/
afero.go
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/
afero.go
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// Mgmt
// Copyright (C) 2013-2024+ 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 <https://www.gnu.org/licenses/>.
//
// Additional permission under GNU GPL version 3 section 7
//
// If you modify this program, or any covered work, by linking or combining it
// with embedded mcl code and modules (and that the embedded mcl code and
// modules which link with this program, contain a copy of their source code in
// the authoritative form) containing parts covered by the terms of any other
// license, the licensors of this program grant you additional permission to
// convey the resulting work. Furthermore, the licensors of this program grant
// the original author, James Shubin, additional permission to update this
// additional permission if he deems it necessary to achieve the goals of this
// additional permission.
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) {
if fs == nil {
return "", fmt.Errorf("nil fs")
}
clean := path.Clean(name)
str := clean + "/\n" // named dir
if name == "" {
str = ".\n" // relative dir
}
if name == "/" {
str = "/\n" // root dir
}
s, err := stringify(fs, clean, []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, all bool) error {
src = path.Join("/", src)
dst = path.Join("/", dst)
// TODO: clean this up with function that gets parent dir?
src = path.Clean(src)
parentDir, _ := path.Split(src)
srcFsLen := len(parentDir)
walkFn := func(name string, info os.FileInfo, err error) error {
if err != nil {
return err
}
perm := info.Mode() // get file permissions
p := path.Join(dst, name[srcFsLen:])
if info.IsDir() {
if all {
err = dstFs.MkdirAll(p, perm)
} else {
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)
}
// CopyFsContents 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. Notably, this does not copy the src dir
// itself, and only includes the contents. This is similar to `rsync dir/` vs.
// `rsync dir`. This function does the former, where as CopyFs does the latter.
// TODO: this should be made more rsync like and robust!
func CopyFsContents(srcFs afero.Fs, dstFs afero.Fs, src string, dst string, force bool) error {
src = path.Join("/", src)
dst = path.Join("/", dst)
// TODO: clean this up with function that gets parent dir?
src = path.Clean(src)
parentDir, _ := path.Split(src)
srcFsLen := len(parentDir)
walkFn := func(name string, info os.FileInfo, err error) error {
if err != nil {
return err
}
perm := info.Mode() // get file permissions
// basically, we want to go "up" one dir so we don't copy it...
// this is like `rsync dir/` vs. `rsync dir`
p, err := RemovePathPrefix(path.Join(dst, name[srcFsLen:]))
if err != nil {
return err
}
if info.IsDir() {
err := dstFs.Mkdir(p, perm)
if os.IsExist(err) && (p == "/" || 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, false)
}
// 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, false)
}
// CopyDiskToFsAll performs exactly as CopyDiskToFs, except that it allows you
// to specify the `all` argument which switches CopyFs to using MkdirAll instead
// of the regular Mkdir.
// TODO: This works around weird copying issues. POSIX is hard.
func CopyDiskToFsAll(dstFs afero.Fs, src, dst string, force, all bool) error {
return CopyFs(afero.NewOsFs(), dstFs, src, dst, force, all)
}
// CopyFsContentsToDisk performs exactly as CopyFs, except that the dst fs is
// our local disk os fs, and we don't keep the source dir name, we only copy the
// contents.
func CopyFsContentsToDisk(srcFs afero.Fs, src, dst string, force bool) error {
return CopyFsContents(srcFs, afero.NewOsFs(), src, dst, force)
}
// CopyDiskContentsToFs performs exactly as CopyFs, except that the src fs is
// our local disk os fs, and we don't keep the source dir name, we only copy the
// contents.
func CopyDiskContentsToFs(dstFs afero.Fs, src, dst string, force bool) error {
return CopyFsContents(afero.NewOsFs(), dstFs, src, dst, force)
}