ash_test/ash-vars/var_leak.tests

# cat is an external program, variable should not leak out of it.
# this currently fails with CONFIG_FEATURE_SH_NOFORK=y
VAR=''
VAR=val0 cat /dev/null
echo "should be empty: '$VAR'"

# true is a regular builtin, variable should not leak out of it.
VAR=''
VAR=val1 true
echo "should be empty: '$VAR'"

# ash follows the "special builtin leaks variables" rule here:
# exec is a special builtin. (bash does not do it)
VAR=''
VAR=val2 exec 2>&1
echo "should be not empty: '$VAR'"

# ash follows the "function call is a special builtin" rule here
# (bash does not do it)
f() { true; }
VAR=''
VAR=val3 f
echo "should be not empty: '$VAR'"
1	# cat is an external program, variable should not leak out of it.
2	# this currently fails with CONFIG_FEATURE_SH_NOFORK=y
3	VAR=''
4	VAR=val0 cat /dev/null
5	echo "should be empty: '$VAR'"
6
7	# true is a regular builtin, variable should not leak out of it.
8	VAR=''
9	VAR=val1 true
10	echo "should be empty: '$VAR'"
11
12	# ash follows the "special builtin leaks variables" rule here:
13	# exec is a special builtin. (bash does not do it)
14	VAR=''
15	VAR=val2 exec 2>&1
16	echo "should be not empty: '$VAR'"
17
18	# ash follows the "function call is a special builtin" rule here
19	# (bash does not do it)
20	f() { true; }
21	VAR=''
22	VAR=val3 f
23	echo "should be not empty: '$VAR'"