cheat/vendor/github.com/xanzy/ssh-agent/sshagent_windows.go
Christopher Allen Lane 80c91cbdee feat(installer): use go-git to clone
Integrate `go-git` into the application, and use it to `git clone`
cheatsheets when the installer runs.

Previously, the installer required that `git` be installed on the system
`PATH`, so this change has to big advantages:

1. It removes that system dependency on `git`
2. It paves the way for implementing the `--update` command

Additionally, `cheat` now performs a `--depth=1` clone when installing
cheatsheets, which should at least somewhat improve installation times
(especially on slow network connections).
2022-08-27 21:00:46 -04:00

105 lines
2.5 KiB
Go

//
// Copyright (c) 2014 David Mzareulyan
//
// Permission is hereby granted, free of charge, to any person obtaining a copy of this software
// and associated documentation files (the "Software"), to deal in the Software without restriction,
// including without limitation the rights to use, copy, modify, merge, publish, distribute,
// sublicense, and/or sell copies of the Software, and to permit persons to whom the Software
// is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all copies or substantial
// portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
// BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
//go:build windows
// +build windows
package sshagent
import (
"errors"
"io"
"net"
"sync"
"github.com/Microsoft/go-winio"
"golang.org/x/crypto/ssh/agent"
)
const (
sshAgentPipe = `\\.\pipe\openssh-ssh-agent`
)
// Available returns true if Pageant is running
func Available() bool {
if pageantWindow() != 0 {
return true
}
conn, err := winio.DialPipe(sshAgentPipe, nil)
if err != nil {
return false
}
conn.Close()
return true
}
// New returns a new agent.Agent and the (custom) connection it uses
// to communicate with a running pagent.exe instance (see README.md)
func New() (agent.Agent, net.Conn, error) {
if pageantWindow() != 0 {
return agent.NewClient(&conn{}), nil, nil
}
conn, err := winio.DialPipe(sshAgentPipe, nil)
if err != nil {
return nil, nil, errors.New(
"SSH agent requested, but could not detect Pageant or Windows native SSH agent",
)
}
return agent.NewClient(conn), nil, nil
}
type conn struct {
sync.Mutex
buf []byte
}
func (c *conn) Close() {
c.Lock()
defer c.Unlock()
c.buf = nil
}
func (c *conn) Write(p []byte) (int, error) {
c.Lock()
defer c.Unlock()
resp, err := query(p)
if err != nil {
return 0, err
}
c.buf = append(c.buf, resp...)
return len(p), nil
}
func (c *conn) Read(p []byte) (int, error) {
c.Lock()
defer c.Unlock()
if len(c.buf) == 0 {
return 0, io.EOF
}
n := copy(p, c.buf)
c.buf = c.buf[n:]
return n, nil
}