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test-lib-functions: detect test_when_finished in subshell

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test_when_finished does nothing in a subshell because the change to
test_cleanup does not affect the parent.

There is no POSIX way to detect that we are in a subshell ($$ and $PPID
are specified to remain unchanged), but we can detect it on Bash and
fall back to ignoring the bug on other shells.

Signed-off-by: John Keeping <john@keeping.me.uk>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
John Keeping 2015-09-05 14:12:49 +01:00 committed by Junio C Hamano
parent da568b66f1
commit 0968f12a99
1 changed files with 5 additions and 0 deletions
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5
t/test-lib-functions.sh
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@ -736,6 +736,11 @@ test_seq () {
# what went wrong.
test_when_finished () {
# We cannot detect when we are in a subshell in general, but by
# doing so on Bash is better than nothing (the test will
# silently pass on other shells).
test "${BASH_SUBSHELL-0}" = 0 ||
error "bug in test script: test_when_finished does nothing in a subshell"
test_cleanup="{ $*
} && (exit \"\$eval_ret\"); eval_ret=\$?; $test_cleanup"
}