path: root/t/perf/
diff options
authorEric Sunshine <>2020-12-16 07:39:07 (GMT)
committerJunio C Hamano <>2020-12-16 19:00:29 (GMT)
commitf4698738f9dbe733e64f968fff95a9a4f881431e (patch)
tree487b3469731761c2911665e9a5a5b03137c753f7 /t/perf/
parent898f80736c75878acc02dc55672317fcc0e0a5a6 (diff)
t/perf: fix test_export() failure with BSD `sed`
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 <> Diagnosed-by: Philippe Blain <> Signed-off-by: Eric Sunshine <> Signed-off-by: Junio C Hamano <>
Diffstat (limited to 't/perf/')
1 files changed, 7 insertions, 2 deletions
diff --git a/t/perf/ b/t/perf/
index 821581a..22d727c 100644
--- a/t/perf/
+++ b/t/perf/
@@ -148,13 +148,18 @@ test_run_perf_ () {
test_export () {
[ $# != 0 ] || return 0
- test_export_="$test_export_\\|$1"
+ test_export_="$test_export_ $1"
test_export "$@"
-set | sed -n "s'"/'/'\\\\''/g"';s/^\\($test_export_\\)/export '"'&'"'/p" >test_vars
+for v in $test_export_
+ needles="$needles;s/^$v=/export $v=/p"
+set | sed -n "s'"/'/'\\\\''/g"'$needles" >test_vars
exit $ret' >&3 2>&4