Merge branch 'spawn-with-spaces'

This topic branch conflicts with the next change that will change the
way we call `CreateProcessW()`. So let's merge it early, to avoid merge
conflicts during a merge (because we would have to resolve this with
every single merging-rebase).

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

compat/mingw.c

@@ -1465,7 +1465,9 @@ static pid_t mingw_spawnve_fd(const char *cmd, const char **argv, char **deltaen
 	si.hStdOutput = winansi_get_osfhandle(fhout);
 	si.hStdError = winansi_get_osfhandle(fherr);
 
-	if (xutftowcs_path(wcmd, cmd) < 0)
+	if (*argv && !strcmp(cmd, *argv))
+		wcmd[0] = L'\0';
+	else if (xutftowcs_path(wcmd, cmd) < 0)
 		return -1;
 	if (dir && xutftowcs_path(wdir, dir) < 0)
 		return -1;
@@ -1494,8 +1496,8 @@ static pid_t mingw_spawnve_fd(const char *cmd, const char **argv, char **deltaen
 	wenvblk = make_environment_block(deltaenv);
 
 	memset(&pi, 0, sizeof(pi));
-	ret = CreateProcessW(wcmd, wargs, NULL, NULL, TRUE, flags,
-		wenvblk, dir ? wdir : NULL, &si, &pi);
+	ret = CreateProcessW(*wcmd ? wcmd : NULL, wargs, NULL, NULL, TRUE,
+		flags, wenvblk, dir ? wdir : NULL, &si, &pi);
 
 	free(wenvblk);
 	free(wargs);

t/t0061-run-command.sh

@@ -210,4 +210,10 @@ test_expect_success MINGW 'verify curlies are quoted properly' '
 	test_cmp expect actual
 '
 
+test_expect_success MINGW 'can spawn with argv[0] containing spaces' '
+	cp "$GIT_BUILD_DIR/t/helper/test-fake-ssh$X" ./ &&
+	test_must_fail "$PWD/test-fake-ssh$X" 2>err &&
+	grep TRASH_DIRECTORY err
+'
+
 test_done