[PATCH v2 1/3] t0301: fixes for windows compatibility

["Carlo Marcelo Arenas Belón" <carenas@gmail.com>]

In preparation for a future patch that will allow building with
Unix Sockets in Windows, workaround a couple of issues from the
Mingw-W64 compatibility layer.

test -S is not able to detect that a file is a socket, so use
test -e instead (through a library function).

`mkdir -m` will always fail with permission problems, so instead
call mkdir followed by chmod.

The last invocation of mkdir would likely need the same treatment
but SYMLINK is unlikely to be enabled on Windows so it has been
punted for now.

Signed-off-by: Carlo Marcelo Arenas Belón <carenas@gmail.com>
---
v2:
* avoid the confusing -f test as suggested by Bagas
* try to help casual readers as suggested by Junio

 t/t0301-credential-cache.sh | 32 ++++++++++++++++++++++++--------
 1 file changed, 24 insertions(+), 8 deletions(-)

diff --git a/t/t0301-credential-cache.sh b/t/t0301-credential-cache.sh
index ebd5fa5249..1f7b1e29e6 100755
--- a/t/t0301-credential-cache.sh
+++ b/t/t0301-credential-cache.sh
@@ -9,6 +9,21 @@ test -z "$NO_UNIX_SOCKETS" || {
 	test_done
 }
 
+test_path_is_socket () {
+	test -S "$1"
+}
+
+# in Windows, Unix Sockets look just like regular files
+uname_s=$(uname -s)
+case $uname_s in
+*MINGW*)
+	test_socket_exist=test_path_exists
+	;;
+*)
+	test_socket_exist=test_path_is_socket
+	;;
+esac
+
 # don't leave a stale daemon running
 test_atexit 'git credential-cache exit'
 
@@ -21,7 +36,7 @@ test_expect_success 'socket defaults to ~/.cache/git/credential/socket' '
 		rmdir -p .cache/git/credential/
 	" &&
 	test_path_is_missing "$HOME/.git-credential-cache" &&
-	test -S "$HOME/.cache/git/credential/socket"
+	$test_socket_exist "$HOME/.cache/git/credential/socket"
 '
 
 XDG_CACHE_HOME="$HOME/xdg"
@@ -31,7 +46,7 @@ helper_test cache
 
 test_expect_success "use custom XDG_CACHE_HOME if set and default sockets are not created" '
 	test_when_finished "git credential-cache exit" &&
-	test -S "$XDG_CACHE_HOME/git/credential/socket" &&
+	$test_socket_exist "$XDG_CACHE_HOME/git/credential/socket" &&
 	test_path_is_missing "$HOME/.git-credential-cache/socket" &&
 	test_path_is_missing "$HOME/.cache/git/credential/socket"
 '
@@ -48,7 +63,7 @@ test_expect_success 'credential-cache --socket option overrides default location
 	username=store-user
 	password=store-pass
 	EOF
-	test -S "$HOME/dir/socket"
+	$test_socket_exist "$HOME/dir/socket"
 '
 
 test_expect_success "use custom XDG_CACHE_HOME even if xdg socket exists" '
@@ -62,7 +77,7 @@ test_expect_success "use custom XDG_CACHE_HOME even if xdg socket exists" '
 	username=store-user
 	password=store-pass
 	EOF
-	test -S "$HOME/.cache/git/credential/socket" &&
+	$test_socket_exist "$HOME/.cache/git/credential/socket" &&
 	XDG_CACHE_HOME="$HOME/xdg" &&
 	export XDG_CACHE_HOME &&
 	check approve cache <<-\EOF &&
@@ -71,7 +86,7 @@ test_expect_success "use custom XDG_CACHE_HOME even if xdg socket exists" '
 	username=store-user
 	password=store-pass
 	EOF
-	test -S "$XDG_CACHE_HOME/git/credential/socket"
+	$test_socket_exist "$XDG_CACHE_HOME/git/credential/socket"
 '
 
 test_expect_success 'use user socket if user directory exists' '
@@ -79,14 +94,15 @@ test_expect_success 'use user socket if user directory exists' '
 		git credential-cache exit &&
 		rmdir \"\$HOME/.git-credential-cache/\"
 	" &&
-	mkdir -p -m 700 "$HOME/.git-credential-cache/" &&
+	mkdir -p "$HOME/.git-credential-cache/" &&
+	chmod 700 "$HOME/.git-credential-cache/" &&
 	check approve cache <<-\EOF &&
 	protocol=https
 	host=example.com
 	username=store-user
 	password=store-pass
 	EOF
-	test -S "$HOME/.git-credential-cache/socket"
+	$test_socket_exist "$HOME/.git-credential-cache/socket"
 '
 
 test_expect_success SYMLINKS 'use user socket if user directory is a symlink to a directory' '
@@ -103,7 +119,7 @@ test_expect_success SYMLINKS 'use user socket if user directory is a symlink to
 	username=store-user
 	password=store-pass
 	EOF
-	test -S "$HOME/.git-credential-cache/socket"
+	$test_socket_exist "$HOME/.git-credential-cache/socket"
 '
 
 helper_test_timeout cache --timeout=1
-- 
2.33.0.481.g26d3bed244