1	#!/bin/bash
2	#
3	# Cases relevant to set -o strict-errexit in OSH.
4	#
5	# Summary:
6	# - errexit is reset to false in ash/bash -- completely ignored!
7	# - local assignment is different than global! The exit code and errexit
8	# behavior are different because the concept of the "last command" is
9	# different.
10	# - ash has copied bash behavior!
11
12	#### command sub: errexit ignored
13	# This is the bash-specific bug here:
14	# https://blogs.janestreet.com/when-bash-scripts-bite/
15	# In bash 4.4, inherit_errexit should fix this.
16	set -o errexit
17	echo $(echo one; false; echo two) # bash/ash keep going
18	echo status=$?
19	## STDOUT:
20	one two
21	status=0
22	## END
23	# dash and mksh: inner shell aborts, but outer one keeps going!
24	## OK dash/mksh STDOUT:
25	one
26	status=0
27	## END
28
29	#### command sub: errexit not ignored with strict-errexit
30	set -o errexit
31	set -o strict-errexit || true
32	echo zero
33	echo $(echo one; false; echo two) # bash/ash keep going
34	echo status=$?
35	## STDOUT:
36	zero
37	## END
38	## status: 1
39	## N-I dash status: 2
40	## N-I dash stdout-json: ""
41	## N-I mksh stdout-json: ""
42	## N-I ash/bash status: 0
43	## N-I ash/bash STDOUT:
44	zero
45	one two
46	status=0
47	## END
48
49	#### command sub: last command fails but keeps going and exit code is 0
50	set -o errexit
51	echo $(echo one; false) # we lost the exit code
52	echo status=$?
53	## STDOUT:
54	one
55	status=0
56	## END
57
58	#### global assignment with command sub: middle command fails
59	set -o errexit
60	s=$(echo one; false; echo two;)
61	echo "$s"
62	## status: 0
63	## STDOUT:
64	one
65	two
66	## END
67	# dash and mksh: whole thing aborts!
68	## OK dash/mksh stdout-json: ""
69	## OK dash/mksh status: 1
70
71	#### global assignment with command sub: last command fails and it aborts
72	set -o errexit
73	s=$(echo one; false)
74	echo status=$?
75	## stdout-json: ""
76	## status: 1
77
78	#### local: middle command fails and keeps going
79	set -o errexit
80	f() {
81	echo good
82	local x=$(echo one; false; echo two)
83	echo status=$?
84	echo $x
85	}
86	f
87	## STDOUT:
88	good
89	status=0
90	one two
91	## END
92	# for dash and mksh, the INNER shell aborts, but the outer one keeps going!
93	## OK dash/mksh STDOUT:
94	good
95	status=0
96	one
97	## END
98
99	#### local: last command fails and also keeps going
100	set -o errexit
101	f() {
102	echo good
103	local x=$(echo one; false)
104	echo status=$?
105	echo $x
106	}
107	f
108	## STDOUT:
109	good
110	status=0
111	one
112	## END
113
114	#### local and strict-errexit
115	# I've run into this problem a lot.
116	set -o errexit
117	set -o strict-errexit || true # ignore error
118	f() {
119	echo good
120	local x=$(echo one; false; echo two)
121	echo status=$?
122	echo $x
123	}
124	f
125	## status: 1
126	## STDOUT:
127	good
128	## END
129	## N-I bash/ash status: 0
130	## N-I bash/ash STDOUT:
131	good
132	status=0
133	one two
134	## END
135	## N-I dash status: 2
136	## N-I dash stdout-json: ""
137	## N-I mksh status: 1
138	## N-I mksh stdout-json: ""
139
140	#### global assignment when last status is failure
141	# this is a bug I introduced
142	set -o errexit
143	[ -n "${BUILDDIR+x}" ] && _BUILDDIR=$BUILDDIR
144	BUILDDIR=${_BUILDDIR-$BUILDDIR}
145	echo status=$?
146	## STDOUT:
147	status=0
148	## END
149
150	#### global assignment when last status is failure
151	# this is a bug I introduced
152	set -o errexit
153	x=$(false) || true # from abuild
154	[ -n "$APORTSDIR" ] && true
155	BUILDDIR=${_BUILDDIR-$BUILDDIR}
156	echo status=$?
157	## STDOUT:
158	status=0
159	## END