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41f70f1f4f
Allow setting custom arguments for the `sftp` backend, by using the `sftp.args` option. This is similar to the approach already implemented in the `rclone` backend, to support new arguments without requiring future code changes for each different SSH argument. Closes #4241
95 lines
2.6 KiB
Go
95 lines
2.6 KiB
Go
package sftp
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import (
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"net/url"
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"path"
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"strings"
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"github.com/restic/restic/internal/errors"
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"github.com/restic/restic/internal/options"
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)
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// Config collects all information required to connect to an sftp server.
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type Config struct {
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User, Host, Port, Path string
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Layout string `option:"layout" help:"use this backend directory layout (default: auto-detect)"`
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Command string `option:"command" help:"specify command to create sftp connection"`
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Args string `option:"args" help:"specify arguments for ssh"`
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Connections uint `option:"connections" help:"set a limit for the number of concurrent connections (default: 5)"`
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}
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// NewConfig returns a new config with default options applied.
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func NewConfig() Config {
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return Config{
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Connections: 5,
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}
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}
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func init() {
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options.Register("sftp", Config{})
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}
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// ParseConfig parses the string s and extracts the sftp config. The
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// supported configuration formats are sftp://user@host[:port]/directory
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// and sftp:user@host:directory. The directory will be path Cleaned and can
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// be an absolute path if it starts with a '/' (e.g.
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// sftp://user@host//absolute and sftp:user@host:/absolute).
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func ParseConfig(s string) (*Config, error) {
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var user, host, port, dir string
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switch {
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case strings.HasPrefix(s, "sftp://"):
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// parse the "sftp://user@host/path" url format
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url, err := url.Parse(s)
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if err != nil {
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return nil, errors.WithStack(err)
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}
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if url.User != nil {
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user = url.User.Username()
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}
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host = url.Hostname()
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port = url.Port()
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dir = url.Path
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if dir == "" {
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return nil, errors.Errorf("invalid backend %q, no directory specified", s)
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}
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dir = dir[1:]
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case strings.HasPrefix(s, "sftp:"):
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// parse the sftp:user@host:path format, which means we'll get
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// "user@host:path" in s
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s = s[5:]
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// split user@host and path at the colon
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var colon bool
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host, dir, colon = strings.Cut(s, ":")
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if !colon {
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return nil, errors.New("sftp: invalid format, hostname or path not found")
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}
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// split user and host at the "@"
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data := strings.SplitN(host, "@", 3)
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if len(data) == 3 {
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user = data[0] + "@" + data[1]
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host = data[2]
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} else if len(data) == 2 {
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user = data[0]
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host = data[1]
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}
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default:
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return nil, errors.New(`invalid format, does not start with "sftp:"`)
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}
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p := path.Clean(dir)
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if strings.HasPrefix(p, "~") {
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return nil, errors.New("sftp path starts with the tilde (~) character, that fails for most sftp servers.\nUse a relative directory, most servers interpret this as relative to the user's home directory")
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}
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cfg := NewConfig()
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cfg.User = user
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cfg.Host = host
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cfg.Port = port
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cfg.Path = p
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return &cfg, nil
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}
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