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t/perf: fix test_export() failure with BSD sed

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test_perf() runs each test in its own subshell which makes it difficult
to persist variables between tests. test_export() addresses this
shortcoming by grabbing the values of specified variables after a test
runs but before the subshell exits, and writes those values to a file
which is loaded into the environment of subsequent tests.

To grab the values to be persisted, test_export() pipes the output of
the shell's builtin `set` command through `sed` which plucks them out
using a regular expression along the lines of `s/^(var1|var2)/.../p`.
Unfortunately, though, this use of alternation is not portable. For
instance, BSD-lineage `sed` (including macOS `sed`) does not support it
in the default "basic regular expression" mode (BRE). It may be possible
to enable "extended regular expression" mode (ERE) in some cases with
`sed -E`, however, `-E` is neither portable nor part of POSIX.

Fortunately, alternation is unnecessary in this case and can easily be
avoided, so replace it with a series of simple expressions such as
`s/^var1/.../p;s/^var2/.../p`.

While at it, tighten the expressions so they match the variable names
exactly rather than matching prefixes (i.e. use `s/^var1=/.../p`).

If the requirements of test_export() become more complex in the future,
then an alternative would be to replace `sed` with `perl` which supports
alternation on all platforms, however, the simple elimination of
alternation via multiple `sed` expressions suffices for the present.

Reported-by: Sangeeta <sangunb09@gmail.com>
Diagnosed-by: Philippe Blain <levraiphilippeblain@gmail.com>
Signed-off-by: Eric Sunshine <sunshine@sunshineco.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Eric Sunshine 2020-12-16 02:39:07 -05:00 committed by Junio C Hamano
parent 898f80736c
commit f4698738f9
1 changed files with 7 additions and 2 deletions
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9
t/perf/perf-lib.sh
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@ -148,13 +148,18 @@ test_run_perf_ () {
. '"$TEST_DIRECTORY"/test-lib-functions.sh'
test_export () {
[ $# != 0 ] || return 0
test_export_="$test_export_\\|$1"
test_export_="$test_export_ $1"
shift
test_export "$@"
}
'"$1"'
ret=$?
set | sed -n "s'"/'/'\\\\''/g"';s/^\\($test_export_\\)/export '"'&'"'/p" >test_vars
needles=
for v in $test_export_
do
needles="$needles;s/^$v=/export $v=/p"
done
set | sed -n "s'"/'/'\\\\''/g"'$needles" >test_vars
exit $ret' >&3 2>&4
eval_ret=$?