blob: 557ffad0d5f0fc550e19cdfc0e19e97628ef576c (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
|
#!/bin/sh
# Copyright 2023 Helmut Grohne <helmut@subdivi.de>
# SPDX-License-Identifier: MIT
: <<'POD2MAN'
=head1 NAME
debvm-waitssh - Wait for a ssh server to be reachable
=head1 SYNOPSIS
B<debvm-waitssh> [B<-t> I<timeout>] [I<hostname>:]I<port>
=head1 DESCRIPTION
B<debvm-waitssh> can be used to wait for a virtual machine with exposed ssh port to be reachable on that port.
If no hostname is given, B<127.0.0.1> is assumed.
=head1 OPTIONS
=over 8
=item B<-t> I<timeout>, B<--timeout>=I<timeout>
Set the maximum duration for waiting in seconds.
Defaults to one minute.
=back
=head1 EXIT VALUES
=over 8
=item B<0>
The server is reachable.
=item B<1>
A timeout was reached before the server answered.
=item B<2>
Usage error.
=back
=head1 SEE ALSO
debvm-run(1)
=cut
POD2MAN
set -u
TOTALTIMEOUT=60
SCANTIMEOUT=10
SCANDELAY=1
nth_arg() {
shift "$1"
printf "%s" "$1"
}
die() {
echo "$*" >&2
exit 2
}
usage() {
die "usage: $0 [-t <timeout>] [<host>:]<port>"
}
usage_error() {
echo "error: $*" >&2
usage
}
opt_timeout() {
TOTALTIMEOUT=$1
}
while getopts :t:-: OPTCHAR; do
case "$OPTCHAR" in
t) opt_timeout "$OPTARG" ;;
-)
case "$OPTARG" in
help)
usage
;;
timeout)
test "$OPTIND" -gt "$#" && usage_error "missing argument for --$OPTARG"
"opt_$OPTARG" "$(nth_arg "$OPTIND" "$@")"
OPTIND=$((OPTIND+1))
;;
timeout=)
"opt_${OPTARG%%=*}" "${OPTARG#*=}"
;;
*)
usage_error "unrecognized option --$OPTARG"
;;
esac
;;
:)
usage_error "missing argument for -$OPTARG"
;;
'?')
usage_error "unrecognized option -$OPTARG"
;;
*)
die "internal error while parsing command options, please report a bug"
;;
esac
done
shift "$((OPTIND - 1))"
test "$#" = 1 || usage
case "$1" in
"")
usage
;;
*:*)
HOST=${1%:*}
PORT=${1##*:}
;;
*)
HOST=127.0.0.1
PORT=$1
;;
esac
now=$(date +%s)
deadline=$((now + TOTALTIMEOUT))
while test "$now" -lt "$deadline"; do
start=$now
ssh-keyscan -T "$SCANTIMEOUT" -p "$PORT" "$HOST" >/dev/null 2>&1 && exit 0
now=$(date +%s)
if test "$((now - start))" -lt "$SCANTIMEOUT"; then
sleep "$SCANDELAY"
now=$(date +%s)
fi
done
exit 1
|
