1#!/bin/sh
2# Tcl ignores the next line -*- tcl -*- \
3exec wish "$0" -- "$@"
4
5# This is a trivial implementation of an SSH_ASKPASS handler.
6# Git-gui uses this script if none are already configured.
7
8package require Tk
9
10set answer {}
11set yesno  0
12set rc     255
13
14if {$argc < 1} {
15	set prompt "Enter your OpenSSH passphrase:"
16} else {
17	set prompt [join $argv " "]
18	if {[regexp -nocase {\(yes\/no\)\?\s*$} $prompt]} {
19		set yesno 1
20	}
21}
22
23message .m -text $prompt -justify center -aspect 4000
24pack .m -side top -fill x -padx 20 -pady 20 -expand 1
25
26entry .e -textvariable answer -width 50
27pack .e -side top -fill x -padx 10 -pady 10
28
29proc on_show_input_changed {args} {
30	global show_input
31	if {$show_input} {
32		.e configure -show ""
33	} else {
34		.e configure -show "*"
35	}
36}
37trace add variable show_input write "on_show_input_changed"
38
39set show_input 0
40
41if {!$yesno} {
42	checkbutton .cb_show -text "Show input" -variable show_input
43	pack .cb_show -side top -anchor nw
44}
45
46frame .b
47button .b.ok     -text OK     -command finish
48button .b.cancel -text Cancel -command cancel
49
50pack .b.ok -side left -expand 1
51pack .b.cancel -side right -expand 1
52pack .b -side bottom -fill x -padx 10 -pady 10
53
54bind . <Visibility> {focus -force .e}
55bind . <Key-Return> [list .b.ok invoke]
56bind . <Key-Escape> [list .b.cancel invoke]
57bind . <Destroy>    {set rc $rc}
58
59proc cancel {} {
60	set ::rc 255
61}
62
63proc finish {} {
64	if {$::yesno} {
65		if {$::answer ne "yes" && $::answer ne "no"} {
66			tk_messageBox -icon error -title "Error" -type ok \
67				-message "Only 'yes' or 'no' input allowed."
68			return
69		}
70	}
71
72	# On Windows, force the encoding to UTF-8: it is what `git.exe` expects
73	if {$::tcl_platform(platform) eq {windows}} {
74		set ::answer [encoding convertto utf-8 $::answer]
75	}
76
77	puts $::answer
78	set ::rc 0
79}
80
81wm title . "OpenSSH"
82tk::PlaceWindow .
83vwait rc
84exit $rc
85