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[v3,04/20] t: adapt `test_copy_bytes()` to not use Perl

Message ID 20250327-b4-pks-t-perlless-v3-4-b436de9da1b8@pks.im (mailing list archive)
State New
Headers show
Series t: drop Perl as a mandatory prerequisite | expand

Commit Message

Patrick Steinhardt March 27, 2025, 10:37 a.m. UTC 
The `test_copy_bytes()` helper function copies up to N bytes from stdin
to stdout. This is implemented using Perl, but it can be trivially
adapted to instead use dd(1).

Refactor the helper accordingly, which allows a bunch of tests to pass
when Perl is not available.

Signed-off-by: Patrick Steinhardt <ps@pks.im>
---
 t/test-lib-functions.sh | 12 +-----------
 1 file changed, 1 insertion(+), 11 deletions(-)
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Patch

diff --git a/t/test-lib-functions.sh b/t/test-lib-functions.sh
index 377f08a1428..c4b4d3a4c7f 100644
--- a/t/test-lib-functions.sh
+++ b/t/test-lib-functions.sh
@@ -1640,17 +1640,7 @@  test_match_signal () {
 
 # Read up to "$1" bytes (or to EOF) from stdin and write them to stdout.
 test_copy_bytes () {
-	perl -e '
-		my $len = $ARGV[1];
-		while ($len > 0) {
-			my $s;
-			my $nread = sysread(STDIN, $s, $len);
-			die "cannot read: $!" unless defined($nread);
-			last unless $nread;
-			print $s;
-			$len -= $nread;
-		}
-	' - "$1"
+	dd ibs=1 count="$1" 2>/dev/null
 }
 
 # run "$@" inside a non-git directory