Am 09.02.19 um 05:24 schrieb Jeff King:
> On Fri, Feb 08, 2019 at 05:53:53PM -0500, Randall S. Becker wrote:
>
>>> diff --git a/t/test-lib-functions.sh b/t/test-lib-functions.sh index
>>> 92cf8f812c..4afab14431 100644
>>> --- a/t/test-lib-functions.sh
>>> +++ b/t/test-lib-functions.sh
>>> @@ -1302,3 +1302,8 @@ test_set_port () {
>>> port=$(($port + ${GIT_TEST_STRESS_JOB_NR:-0}))
>>> eval $var=$port
>>> }
>>> +
>>> +# Generate an output of $1 bytes of all zeroes (NULs, not ASCII zeroes).
>>> +gen_zero_bytes () {
>>> + perl -e 'print "\0" x $ARGV[0]' "$@"
>>> +}
>>
>> This function does work on platform, so it's good.
>
> Great. Since it sounds like you're preparing some patches to deal with
> /dev/zero elsewhere, do you want to wrap it up in a patch as part of
> that?
Please do not use yes to generate an infinite amount of bytes. Our
implementation of yes() in test-lib.sh generates only 99 lines.
Perhaps do this.
----- 8< -----
Subject: [PATCH] t5318: avoid /dev/zero
Some platforms do not offer /dev/zero. Use printf and tr to generate
a certain amount of NUL bytes.
Reported-by: Randall S. Becker <rsbecker@xxxxxxxxxxxxx>
Signed-off-by: Johannes Sixt <j6t@xxxxxxxx>
---
t/t5318-commit-graph.sh | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/t/t5318-commit-graph.sh b/t/t5318-commit-graph.sh
index 16d10ebce8..04d394274f 100755
--- a/t/t5318-commit-graph.sh
+++ b/t/t5318-commit-graph.sh
@@ -383,7 +383,8 @@ corrupt_graph_and_verify() {
cp $objdir/info/commit-graph commit-graph-backup &&
printf "$data" | dd of="$objdir/info/commit-graph" bs=1 seek="$pos" conv=notrunc &&
dd of="$objdir/info/commit-graph" bs=1 seek="$zero_pos" count=0 &&
- dd if=/dev/zero of="$objdir/info/commit-graph" bs=1 seek="$zero_pos" count=$(($orig_size - $zero_pos)) &&
+ printf "%0*d" $(($orig_size - $zero_pos)) 0 | tr 0 '\0' |
+ dd of="$objdir/info/commit-graph" bs=1 seek="$zero_pos" &&
test_must_fail git commit-graph verify 2>test_err &&
grep -v "^+" test_err >err &&
test_i18ngrep "$grepstr" err
--
2.20.1.86.gb0de946387
