[v2,1/8] t4061: use POSIX compliant regex(7)
diff mbox series

Message ID 288e343d09dd375bbb61ba97858f518b431d0b1d.1584838148.git.congdanhqx@gmail.com
State New
Headers show
Series
  • fix test failure with busybox
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Commit Message

Đoàn Trần Công Danh March 22, 2020, 12:55 a.m. UTC
BRE interprets `+` literally, and
`\+` is undefined for POSIX BRE, from:
https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap09.html#tag_09_03_02

> The interpretation of an ordinary character preceded
> by an unescaped <backslash> ( '\\' ) is undefined, except for:
> - The characters ')', '(', '{', and '}'
> - The digits 1 to 9 inclusive
> - A character inside a bracket expression

This test is failing with busybox sed, the default sed of Alpine Linux

We have 2 options here:

- Using literal `+` because BRE will interpret it as-is, or
- Using character class `[+]` to defend against a sed that expects ERE

ERE-expected sed is theoretical at this point,
but we haven't found it, yet.
And, we may run into other problems with that sed.
Let's go with first option and fix it later if that sed could be found.

Signed-off-by: Đoàn Trần Công Danh <congdanhqx@gmail.com>
---
 t/t4061-diff-indent.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Patch
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diff --git a/t/t4061-diff-indent.sh b/t/t4061-diff-indent.sh
index 2affd7a100..0f7a6d97a8 100755
--- a/t/t4061-diff-indent.sh
+++ b/t/t4061-diff-indent.sh
@@ -17,7 +17,7 @@  compare_diff () {
 # Compare blame output using the expectation for a diff as reference.
 # Only look for the lines coming from non-boundary commits.
 compare_blame () {
-	sed -n -e "1,4d" -e "s/^\+//p" <"$1" >.tmp-1
+	sed -n -e "1,4d" -e "s/^+//p" <"$1" >.tmp-1
 	sed -ne "s/^[^^][^)]*) *//p" <"$2" >.tmp-2
 	test_cmp .tmp-1 .tmp-2 && rm -f .tmp-1 .tmp-2
 }