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
145
146
147
148
149
150
|
#!/bin/sh
#
# $NetBSD: scoped_command,v 1.2 2016/03/27 14:57:50 christos Exp $
#
# Copyright (c) 2014 The NetBSD Foundation, Inc.
# All rights reserved.
#
# This code is derived from software contributed to The NetBSD Foundation
# by Jarmo Jaakkola.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
# ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
# TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
# BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
#
: ${TEST_SH:=/bin/sh}
sane_sh()
{
set -- ${TEST_SH}
case "$#" in
(0) set /bin/sh;;
(1|2) ;;
(*) set "$1";; # Just ignore options if we cannot make them work
esac
case "$1" in
/*) TEST_SH="$1${2+ }$2";;
./*) TEST_SH="${PWD}${1#.}${2+ }$2";;
*/*) TEST_SH="${PWD}/$1${2+ }$2";;
*) TEST_SH="$( command -v "$1" )${2+ }$2";;
esac
}
sane_sh
set -e
# USAGE:
# scoped_command scope cmd msg var_suffix
#
# Write to stdout a piece of Bourne Shell script with _cmd_ in specific
# _scope_. The execution of _cmd_ is bracketed by prints of "before _msg_"
# and "after _msg_, return value ${?}". If the generated script uses
# variables, __var_suffix_ is appended to their names to allow nesting of
# scripts generated this way.
#
# _scope_ should be one of: case, compound, file, for, func, subshell,
# until, while.
# _cmd_ is the command line to execute. Remember proper quoting!
# _msg_ is text that will be used inside single quotes.
# _var_suffix_ is a syntactically valid identifier name.
# don't rely on command lists (';')
cmd="echo 'before ${3}'
${2}
echo 'after ${3}, return value:' ${?}"
echo "#!${TEST_SH}"
[ 'func' = "${1}" ] && cat <<EOF
func()
{
echo 'before ${3}'
\${1}
echo 'after ${3}'
}
echo 'before function'
func "${2}" "${3}" # don't rely on 'shift'
echo 'after function'
EOF
[ 'case' = "${1}" ] && cat <<EOF
echo 'before case'
case 'a' in
a) ${cmd};;
esac
echo 'after case'
EOF
[ 'file' = "${1}" ] && cat <<EOF
${cmd}
EOF
[ 'while' = "${1}" ] && cat <<EOF
echo 'before while'
cond_${4}='true true false'
while \${cond_${4}}
do
cond_${4}="\${cond_${4}#* }"
${cmd}
done
echo 'after while'
EOF
[ 'until' = "${1}" ] && cat <<EOF
echo 'before until'
cond_${4}='false false true'
until \${cond_${4}}
do
cond_${4}="\${cond_${4}#* }"
${cmd}
done
echo 'after until'
EOF
[ 'for' = "${1}" ] && cat <<EOF
echo 'before for'
for i_${4} in 1 2
do
${cmd}
done
echo 'after for'
EOF
[ 'subshell' = "${1}" ] && cat <<EOF
(
echo 'subshell start'
${cmd}
echo 'subshell end'
)
EOF
[ 'compound' = "${1}" ] && cat <<EOF
{
echo 'compound start'
${cmd};
echo 'compound end'
}
EOF
exit 0
|
