win32: detect unix socket support at runtime

Windows 10 build 17063 introduced support for unix sockets to Windows.
bb390b1 (git-compat-util: include declaration for unix sockets in
windows, 2021-09-14) introduced a way to build git with unix socket
support on Windows, but you still had to decide at build time which
Windows version the compiled executable was supposed to run on.

We can detect at runtime wether the operating system supports unix
sockets and act accordingly for all supported Windows versions.

Signed-off-by: Matthias Aßhauer <mha1993@live.de>

builtin/credential-cache--daemon.c

@@ -294,6 +294,8 @@ int cmd_credential_cache_daemon(int argc, const char **argv, const char *prefix)
 	argc = parse_options(argc, argv, prefix, options, usage, 0);
 	socket_path = argv[0];
 
+	if (!have_unix_sockets())
+		die(_("credential-cache--daemon unavailable; no unix socket support"));
 	if (!socket_path)
 		usage_with_options(usage, options);
 

builtin/credential-cache.c

@@ -149,6 +149,9 @@ int cmd_credential_cache(int argc, const char **argv, const char *prefix)
 		usage_with_options(usage, options);
 	op = argv[0];
 
+	if (!have_unix_sockets())
+		die(_("credential-cache unavailable; no unix socket support"));
+
 	if (!socket_path)
 		socket_path = get_socket_path();
 	if (!socket_path)

compat/mingw.c

@@ -4215,3 +4215,22 @@ int file_attr_to_st_mode (DWORD attr, DWORD tag, const char *path)
 		fMode |= S_IWRITE;
 	return fMode;
 }
+
+int mingw_have_unix_sockets(void)
+{
+	SC_HANDLE scm, srvc;
+	SERVICE_STATUS_PROCESS status;
+	DWORD bytes;
+	int ret = 0;
+	scm = OpenSCManagerA(NULL, NULL, SC_MANAGER_CONNECT);
+	if (scm) {
+		srvc = OpenServiceA(scm, "afunix", SERVICE_QUERY_STATUS);
+		if (srvc) {
+			if(QueryServiceStatusEx(srvc, SC_STATUS_PROCESS_INFO, (LPBYTE)&status, sizeof(SERVICE_STATUS_PROCESS), &bytes))
+				ret = status.dwCurrentState == SERVICE_RUNNING;
+			CloseServiceHandle(srvc);
+		}
+		CloseServiceHandle(scm);
+	}
+	return ret;
+}

compat/mingw.h

@@ -729,3 +729,9 @@ int err_win_to_posix(DWORD winerr);
  * Check current process is inside Windows Container.
  */
 int is_inside_windows_container(void);
+
+#ifndef NO_UNIX_SOCKETS
+int mingw_have_unix_sockets(void);
+#undef have_unix_sockets
+#define have_unix_sockets mingw_have_unix_sockets
+#endif

config.mak.uname

@@ -447,7 +447,6 @@ ifeq ($(uname_S),Windows)
 	NO_POLL = YesPlease
 	NO_SYMLINK_HEAD = YesPlease
 	NO_IPV6 = YesPlease
-	NO_UNIX_SOCKETS = YesPlease
 	NO_SETENV = YesPlease
 	NO_STRCASESTR = YesPlease
 	NO_STRLCPY = YesPlease
@@ -652,7 +651,6 @@ ifeq ($(uname_S),MINGW)
 	NO_LIBGEN_H = YesPlease
 	NO_POLL = YesPlease
 	NO_SYMLINK_HEAD = YesPlease
-	NO_UNIX_SOCKETS = YesPlease
 	NO_SETENV = YesPlease
 	NO_STRCASESTR = YesPlease
 	NO_STRLCPY = YesPlease

git-compat-util.h

@@ -220,6 +220,18 @@ struct strbuf;
 #define GIT_WINDOWS_NATIVE
 #endif
 
+#if defined(NO_UNIX_SOCKETS) || !defined(GIT_WINDOWS_NATIVE) 
+static inline int _have_unix_sockets(void)
+{
+#if defined(NO_UNIX_SOCKETS)
+	return 0;
+#else
+	return 1;
+#endif
+}
+#define have_unix_sockets _have_unix_sockets
+#endif
+
 #include <unistd.h>
 #include <stdio.h>
 #include <sys/stat.h>
@@ -1627,5 +1639,4 @@ static inline void *container_of_or_null_offset(void *ptr, size_t offset)
 #define OFFSETOF_VAR(ptr, member) \
 	((uintptr_t)&(ptr)->member - (uintptr_t)(ptr))
 #endif /* !__GNUC__ */
-
 #endif

t/t0301-credential-cache.sh

@@ -8,6 +8,14 @@ test -z "$NO_UNIX_SOCKETS" || {
 	skip_all='skipping credential-cache tests, unix sockets not available'
 	test_done
 }
+if test_have_prereq MINGW
+then
+	service_running=$(sc query afunix | grep "4  RUNNING")
+	test -z "$service_running" || {
+		skip_all='skipping credential-cache tests, unix sockets not available'
+		test_done
+	}
+fi
 
 uname_s=$(uname -s)
 case $uname_s in