t0024, t5000: clear variable UNZIP, use GIT_UNZIP instead

InfoZIP's unzip takes default parameters from the environment variable
UNZIP.  Unset it in the test library and use GIT_UNZIP for specifying
alternate versions of the unzip command instead.

t0024 wasn't even using variable for the actual extraction.  t5000
was, but when setting it to InfoZIP's unzip it would try to extract
from itself (because it treats the contents of $UNZIP as parameters),
which failed of course.

Signed-off-by: Rene Scharfe <rene.scharfe@lsrfire.ath.cx>
Reviewed-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/t0024-crlf-archive.sh

@@ -3,7 +3,7 @@
 test_description='respect crlf in git archive'
 
 . ./test-lib.sh
-UNZIP=${UNZIP:-unzip}
+GIT_UNZIP=${GIT_UNZIP:-unzip}
 
 test_expect_success setup '
 
@@ -26,7 +26,7 @@ test_expect_success 'tar archive' '
 
 '
 
-"$UNZIP" -v >/dev/null 2>&1
+"$GIT_UNZIP" -v >/dev/null 2>&1
 if [ $? -eq 127 ]; then
 	say "Skipping ZIP test, because unzip was not found"
 else
@@ -37,7 +37,7 @@ test_expect_success UNZIP 'zip archive' '
 
 	git archive --format=zip HEAD >test.zip &&
 
-	( mkdir unzipped && cd unzipped && unzip ../test.zip ) &&
+	( mkdir unzipped && cd unzipped && "$GIT_UNZIP" ../test.zip ) &&
 
 	test_cmp sample unzipped/sample
 

t/t5000-tar-tree.sh

@@ -25,7 +25,7 @@ commit id embedding:
 '
 
 . ./test-lib.sh
-UNZIP=${UNZIP:-unzip}
+GIT_UNZIP=${GIT_UNZIP:-unzip}
 GZIP=${GZIP:-gzip}
 GUNZIP=${GUNZIP:-gzip -d}
 
@@ -37,9 +37,9 @@ check_zip() {
 	dir=$1
 	dir_with_prefix=$dir/$2
 
-	test_expect_success UNZIP " extract ZIP archive" "
-		(mkdir $dir && cd $dir && $UNZIP ../$zipfile)
-	"
+	test_expect_success UNZIP " extract ZIP archive" '
+		(mkdir $dir && cd $dir && "$GIT_UNZIP" ../$zipfile)
+	'
 
 	test_expect_success UNZIP " validate filenames" "
 		(cd ${dir_with_prefix}a && find .) | sort >$listfile &&
@@ -201,7 +201,7 @@ test_expect_success \
       test_cmp a/substfile2 g/prefix/a/substfile2
 '
 
-$UNZIP -v >/dev/null 2>&1
+"$GIT_UNZIP" -v >/dev/null 2>&1
 if [ $? -eq 127 ]; then
 	say "Skipping ZIP tests, because unzip was not found"
 else

t/test-lib.sh

@@ -85,6 +85,7 @@ unset VISUAL EMAIL LANGUAGE COLUMNS $("$PERL_PATH" -e '
 		.*_TEST
 		PROVE
 		VALGRIND
+		UNZIP
 		PERF_AGGREGATING_LATER
 	));
 	my @vars = grep(/^GIT_/ && !/^GIT_($ok)/o, @env);
@@ -128,6 +129,7 @@ fi
 unset CDPATH
 
 unset GREP_OPTIONS
+unset UNZIP
 
 case $(echo $GIT_TRACE |tr "[A-Z]" "[a-z]") in
 1|2|true)