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sshiofs, a io/fs.FS implementaion for ssh with sudo
Signed-off-by: Artiom Diomin <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,6 +1,6 @@ | ||
| module k8c.io/kubeone | ||
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| go 1.14 | ||
| go 1.16 | ||
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| require ( | ||
| github.com/BurntSushi/toml v0.3.1 | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,105 @@ | ||
| /* | ||
| Copyright 2021 The KubeOne Authors. | ||
| Licensed under the Apache License, Version 2.0 (the "License"); | ||
| you may not use this file except in compliance with the License. | ||
| You may obtain a copy of the License at | ||
| http://www.apache.org/licenses/LICENSE-2.0 | ||
| Unless required by applicable law or agreed to in writing, software | ||
| distributed under the License is distributed on an "AS IS" BASIS, | ||
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| See the License for the specific language governing permissions and | ||
| limitations under the License. | ||
| */ | ||
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| package sshiofs | ||
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| import ( | ||
| "bytes" | ||
| "fmt" | ||
| "io" | ||
| "io/fs" | ||
| "strings" | ||
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| "k8c.io/kubeone/pkg/ssh" | ||
| ) | ||
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| type sshfile struct { | ||
| conn ssh.Connection | ||
| name string | ||
| cursor int64 | ||
| fi fs.FileInfo | ||
| } | ||
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| func (sf *sshfile) Stat() (fs.FileInfo, error) { | ||
| if sf.fi != nil { | ||
| return sf.fi, nil | ||
| } | ||
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| fi, err := newSSHFileInfo(sf.name, sf.conn) | ||
| sf.fi = fi | ||
| return fi, err | ||
| } | ||
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| func (sf *sshfile) Read(p []byte) (int, error) { | ||
| const cmdTpl = `sudo dd status=none iflag=count_bytes,skip_bytes skip=%d count=%d if=%q` | ||
| var ( | ||
| stdout bytes.Buffer | ||
| stderr bytes.Buffer | ||
| ) | ||
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| cmd := fmt.Sprintf(cmdTpl, sf.cursor, len(p), sf.name) | ||
| _, err := sf.conn.POpen(cmd, nil, &stdout, &stderr) | ||
| if err != nil { | ||
| return 0, &fs.PathError{ | ||
| Op: "read", | ||
| Path: sf.name, | ||
| Err: fmt.Errorf("%s %w", stderr.String(), err), | ||
| } | ||
| } | ||
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| n, err := stdout.Read(p) | ||
| sf.cursor += int64(n) | ||
| return n, err | ||
| } | ||
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| func (sf *sshfile) Write(p []byte) (int, error) { | ||
| const cmdTpl = `sudo dd status=none oflag=seek_bytes conv=notrunc seek=%d of=%q` | ||
| cmd := fmt.Sprintf(cmdTpl, sf.cursor, sf.name) | ||
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| var ( | ||
| stdin = bytes.NewBuffer(p) | ||
| stdout strings.Builder | ||
| stderr strings.Builder | ||
| ) | ||
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| _, err := sf.conn.POpen(cmd, stdin, &stdout, &stderr) | ||
| if err != nil { | ||
| return 0, fmt.Errorf("%w: %v %v", err, stderr.String(), stdout.String()) | ||
| } | ||
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| n, err := stdout.Write(p) | ||
| sf.cursor += int64(n) | ||
| return n, err | ||
| } | ||
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| func (sf *sshfile) Seek(offset int64, whence int) (int64, error) { | ||
| switch whence { | ||
| case io.SeekStart: | ||
| sf.cursor = offset | ||
| case io.SeekCurrent: | ||
| sf.cursor += offset | ||
| case io.SeekEnd: | ||
| return sf.cursor, fmt.Errorf("io.SeekEnd unimplemented") | ||
| } | ||
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| return sf.cursor, nil | ||
| } | ||
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| func (sf *sshfile) Close() error { | ||
| sf.cursor = 0 | ||
| sf.fi = nil | ||
| return nil | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,136 @@ | ||
| /* | ||
| Copyright 2021 The KubeOne Authors. | ||
| Licensed under the Apache License, Version 2.0 (the "License"); | ||
| you may not use this file except in compliance with the License. | ||
| You may obtain a copy of the License at | ||
| http://www.apache.org/licenses/LICENSE-2.0 | ||
| Unless required by applicable law or agreed to in writing, software | ||
| distributed under the License is distributed on an "AS IS" BASIS, | ||
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| See the License for the specific language governing permissions and | ||
| limitations under the License. | ||
| */ | ||
|
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| package sshiofs | ||
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| import ( | ||
| "bytes" | ||
| "fmt" | ||
| "io/fs" | ||
| "strings" | ||
| "time" | ||
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| "k8c.io/kubeone/pkg/ssh" | ||
| ) | ||
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| func New(conn ssh.Connection) fs.FS { | ||
| return &sshfs{conn: conn} | ||
| } | ||
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| type sshfs struct { | ||
| conn ssh.Connection | ||
| } | ||
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| func (sfs *sshfs) Open(name string) (fs.File, error) { | ||
| var hadSlashPrefix bool | ||
| if strings.HasPrefix(name, "/") { | ||
| name = strings.TrimPrefix(name, "/") | ||
| hadSlashPrefix = true | ||
| } | ||
| if !fs.ValidPath(name) { | ||
| return nil, &fs.PathError{ | ||
| Op: "open", | ||
| Path: name, | ||
| Err: fs.ErrInvalid, | ||
| } | ||
| } | ||
| if hadSlashPrefix { | ||
| name = "/" + name | ||
| } | ||
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| return &sshfile{ | ||
| conn: sfs.conn, | ||
| name: name, | ||
| }, nil | ||
| } | ||
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| func (sfs *sshfs) ReadFile(name string) ([]byte, error) { | ||
| var buf bytes.Buffer | ||
| _, err := sfs.conn.POpen(fmt.Sprintf("sudo cat %q", name), nil, &buf, nil) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
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| return buf.Bytes(), nil | ||
| } | ||
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| // TODO: implement | ||
| // func (sfs *sshfs) ReadDir(name string) ([]fs.DirEntry, error) { | ||
| // return nil, nil | ||
| // } | ||
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| func newSSHFileInfo(name string, conn ssh.Connection) (fs.FileInfo, error) { | ||
| const statCmd = "sudo stat --printf='%%s %%f %%Y' %q" | ||
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| var ( | ||
| stdout strings.Builder | ||
| stderr strings.Builder | ||
| ) | ||
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| cmd := fmt.Sprintf(statCmd, name) | ||
| exitCode, err := conn.POpen(cmd, nil, &stdout, &stderr) | ||
| if exitCode != 0 || err != nil { | ||
| return nil, &fs.PathError{ | ||
| Op: "open", | ||
| Path: name, | ||
| Err: fmt.Errorf("%s %s %w", stderr.String(), err.Error(), fs.ErrNotExist), | ||
| } | ||
| } | ||
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| var ( | ||
| size int64 | ||
| mode fs.FileMode | ||
| modTime int64 | ||
| ) | ||
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| fia := strings.Split(stdout.String(), " ") | ||
| if len(fia) != 3 { | ||
| return nil, fs.ErrInvalid | ||
| } | ||
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| if _, err = fmt.Sscanf(fia[0], "%d", &size); err != nil { | ||
| return nil, err | ||
| } | ||
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| if _, err = fmt.Sscanf(fia[1], "%x", &mode); err != nil { | ||
| return nil, err | ||
| } | ||
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| if _, err = fmt.Sscanf(fia[2], "%d", &modTime); err != nil { | ||
| return nil, err | ||
| } | ||
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| return &fileInfo{ | ||
| name: name, | ||
| size: size, | ||
| mode: mode, | ||
| time: time.Unix(modTime, 0), | ||
| }, nil | ||
| } | ||
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| type fileInfo struct { | ||
| name string | ||
| size int64 | ||
| mode fs.FileMode | ||
| time time.Time | ||
| } | ||
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| func (fi *fileInfo) Size() int64 { return fi.size } | ||
| func (fi *fileInfo) Mode() fs.FileMode { return fi.mode } | ||
| func (fi *fileInfo) ModTime() time.Time { return fi.time } | ||
| func (fi *fileInfo) Name() string { return fi.name } | ||
| func (fi *fileInfo) IsDir() bool { return fi.mode.IsDir() } | ||
| func (*fileInfo) Sys() interface{} { return nil } |