test-lib: fix non-portable pattern bracket expressions
Use a '!' character to start a non-matching pattern bracket
expression, as specified by POSIX in Shell Command Language section
2.13.1 Patterns Matching a Single Character [1].
I used '^' instead in three places in the previous three commits, to
verify that the arguments of the '--stress=' and '--stress-limit='
options and the values of various '*_PORT' environment variables are
valid numbers. With certain shells, at least with dash (upstream and
in Ubuntu 14.04) and mksh, this led to various undesired behaviors:
# error message in case of a valid number
$ ~/src/dash/src/dash ./t3903-stash.sh --stress=8
error: --stress=<N> requires the number of jobs to run
# not the expected error message
$ ~/src/dash/src/dash ./t3903-stash.sh --stress=foo
./t3903-stash.sh: 238: test: Illegal number: foo
# no error message at all?!
$ mksh ./t3903-stash.sh --stress=foo
$ echo $?
0
Some other shells, e.g. Bash (even in posix mode), ksh, dash in Ubuntu
16.04 or later, are apparently happy to accept '^' just as well.
[1] http://pubs.opengroup.org/onlinepubs/009695399/utilities/xcu_chap02.html#tag_02_13
Signed-off-by: SZEDER Gábor <szeder.dev@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/t/test-lib.sh b/t/test-lib.sh
index 77eff04..4e7cb52 100644
--- a/t/test-lib.sh
+++ b/t/test-lib.sh
@@ -144,7 +144,7 @@
--stress=*)
stress=${opt#--*=}
case "$stress" in
- *[^0-9]*|0*|"")
+ *[!0-9]*|0*|"")
echo "error: --stress=<N> requires the number of jobs to run" >&2
exit 1
;;
@@ -155,7 +155,7 @@
--stress-limit=*)
stress_limit=${opt#--*=}
case "$stress_limit" in
- *[^0-9]*|0*|"")
+ *[!0-9]*|0*|"")
echo "error: --stress-limit=<N> requires the number of repetitions" >&2
exit 1
;;
