mingw: fix t5601-clone.sh

Since baaf233 (connect: improve check for plink to reduce false
positives, 2015-04-26), t5601 writes out a `plink.exe` for testing that
is actually a shell script. So the assumption that the `.exe` extension
implies that the file is *not* a shell script is now wrong.

Since there was no love for the idea of allowing `.exe` files to be
shell scripts on Windows, let's go the other way round: *make*
`plink.exe` a real `.exe`.

This fixes t5601-clone.sh in Git for Windows' SDK.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Makefile

@@ -583,6 +583,7 @@ TEST_PROGRAMS_NEED_X += test-delta
 TEST_PROGRAMS_NEED_X += test-dump-cache-tree
 TEST_PROGRAMS_NEED_X += test-dump-split-index
 TEST_PROGRAMS_NEED_X += test-dump-untracked-cache
+TEST_PROGRAMS_NEED_X += test-fake-ssh
 TEST_PROGRAMS_NEED_X += test-genrandom
 TEST_PROGRAMS_NEED_X += test-hashmap
 TEST_PROGRAMS_NEED_X += test-index-version

t/t5601-clone.sh

@@ -4,6 +4,9 @@ test_description=clone
 
 . ./test-lib.sh
 
+X=
+test_have_prereq !MINGW || X=.exe
+
 test_expect_success setup '
 
 	rm -fr .git &&
@@ -282,23 +285,18 @@ test_expect_success 'clone checking out a tag' '
 
 setup_ssh_wrapper () {
 	test_expect_success 'setup ssh wrapper' '
-		write_script "$TRASH_DIRECTORY/ssh-wrapper" <<-\EOF &&
-		echo >>"$TRASH_DIRECTORY/ssh-output" "ssh: $*" &&
-		# throw away all but the last argument, which should be the
-		# command
-		while test $# -gt 1; do shift; done
-		eval "$1"
-		EOF
-		GIT_SSH="$TRASH_DIRECTORY/ssh-wrapper" &&
+		cp "$GIT_BUILD_DIR/test-fake-ssh$X" \
+			"$TRASH_DIRECTORY/ssh-wrapper$X" &&
+		GIT_SSH="$TRASH_DIRECTORY/ssh-wrapper$X" &&
 		export GIT_SSH &&
 		export TRASH_DIRECTORY &&
 		>"$TRASH_DIRECTORY"/ssh-output
 	'
 }
 
 copy_ssh_wrapper_as () {
-	cp "$TRASH_DIRECTORY/ssh-wrapper" "$1" &&
-	GIT_SSH="$1" &&
+	cp "$TRASH_DIRECTORY/ssh-wrapper$X" "${1%$X}$X" &&
+	GIT_SSH="${1%$X}$X" &&
 	export GIT_SSH
 }
 

test-fake-ssh.c

@@ -0,0 +1,30 @@
+#include "git-compat-util.h"
+#include "run-command.h"
+#include "strbuf.h"
+
+int main(int argc, char **argv)
+{
+	const char *trash_directory = getenv("TRASH_DIRECTORY");
+	struct strbuf buf = STRBUF_INIT;
+	FILE *f;
+	int i;
+	const char *child_argv[] = { NULL, NULL };
+
+	/* First, print all parameters into $TRASH_DIRECTORY/ssh-output */
+	if (!trash_directory)
+		die("Need a TRASH_DIRECTORY!");
+	strbuf_addf(&buf, "%s/ssh-output", trash_directory);
+	f = fopen(buf.buf, "w");
+	if (!f)
+		die("Could not write to %s", buf.buf);
+	for (i = 0; i < argc; i++)
+		fprintf(f, "%s%s", i > 0 ? " " : "", i > 0 ? argv[i] : "ssh:");
+	fprintf(f, "\n");
+	fclose(f);
+
+	/* Now, evaluate the *last* parameter */
+	if (argc < 2)
+		return 0;
+	child_argv[0] = argv[argc - 1];
+	return run_command_v_opt(child_argv, RUN_USING_SHELL);
+}