From 65e654e65f0bfdbaac0e9ac64c1af394ab234dd7 Mon Sep 17 00:00:00 2001
From: JiSeop Moon <zcube@zcube.kr>
Date: Mon, 23 Apr 2018 22:30:18 +0900
Subject: [PATCH] mingw: introduce code to detect whether we're inside a
 Windows container

This will come in handy in the next commit.

Signed-off-by: JiSeop Moon <zcube@zcube.kr>
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
---
 compat/mingw.c | 32 ++++++++++++++++++++++++++++++++
 compat/mingw.h |  5 +++++
 2 files changed, 37 insertions(+)

diff --git a/compat/mingw.c b/compat/mingw.c
index c71e58593457ad..88b2c25d1a51d1 100644
--- a/compat/mingw.c
+++ b/compat/mingw.c
@@ -3867,3 +3867,35 @@ int uname(struct utsname *buf)
 		  "%u", (v >> 16) & 0x7fff);
 	return 0;
 }
+
+/*
+ * Based on https://stackoverflow.com/questions/43002803
+ *
+ * [HKLM\SYSTEM\CurrentControlSet\Services\cexecsvc]
+ * "DisplayName"="@%systemroot%\\system32\\cexecsvc.exe,-100"
+ * "ErrorControl"=dword:00000001
+ * "ImagePath"=hex(2):25,00,73,00,79,00,73,00,74,00,65,00,6d,00,72,00,6f,00,
+ *    6f,00,74,00,25,00,5c,00,73,00,79,00,73,00,74,00,65,00,6d,00,33,00,32,00,
+ *    5c,00,63,00,65,00,78,00,65,00,63,00,73,00,76,00,63,00,2e,00,65,00,78,00,
+ *    65,00,00,00
+ * "Start"=dword:00000002
+ * "Type"=dword:00000010
+ * "Description"="@%systemroot%\\system32\\cexecsvc.exe,-101"
+ * "ObjectName"="LocalSystem"
+ * "ServiceSidType"=dword:00000001
+ */
+int is_inside_windows_container(void)
+{
+	static int inside_container = -1; /* -1 uninitialized */
+	const char *key = "SYSTEM\\CurrentControlSet\\Services\\cexecsvc";
+	HKEY handle = NULL;
+
+	if (inside_container != -1)
+		return inside_container;
+
+	inside_container = ERROR_SUCCESS ==
+		RegOpenKeyExA(HKEY_LOCAL_MACHINE, key, 0, KEY_READ, &handle);
+	RegCloseKey(handle);
+
+	return inside_container;
+}
diff --git a/compat/mingw.h b/compat/mingw.h
index bde51af5c302fe..778a44036ac28b 100644
--- a/compat/mingw.h
+++ b/compat/mingw.h
@@ -717,3 +717,8 @@ void open_in_gdb(void);
  * Used by Pthread API implementation for Windows
  */
 int err_win_to_posix(DWORD winerr);
+
+/*
+ * Check current process is inside Windows Container.
+ */
+int is_inside_windows_container(void);