Merge branch 'sk/mingw-owner-check-error-message-improvement'

In addition to (rather cryptic) Security Identifiers, show username
and domain in the error message when we barf on mismatch between
the Git directory and the current user on Windows.

* sk/mingw-owner-check-error-message-improvement:
  mingw: give more details about unsafe directory's ownership

Author: gitster

compat/mingw.c

@@ -2684,6 +2684,30 @@ static PSID get_current_user_sid(void)
 	return result;
 }
 
+static BOOL user_sid_to_user_name(PSID sid, LPSTR *str)
+{
+	SID_NAME_USE pe_use;
+	DWORD len_user = 0, len_domain = 0;
+	BOOL translate_sid_to_user;
+
+	/*
+	 * returns only FALSE, because the string pointers are NULL
+	 */
+	LookupAccountSidA(NULL, sid, NULL, &len_user, NULL, &len_domain,
+			  &pe_use);
+	/*
+	 * Alloc needed space of the strings
+	 */
+	ALLOC_ARRAY((*str), (size_t)len_domain + (size_t)len_user);
+	translate_sid_to_user = LookupAccountSidA(NULL, sid,
+	    (*str) + len_domain, &len_user, *str, &len_domain, &pe_use);
+	if (!translate_sid_to_user)
+		FREE_AND_NULL(*str);
+	else
+		(*str)[len_domain] = '/';
+	return translate_sid_to_user;
+}
+
 static int acls_supported(const char *path)
 {
 	size_t offset = offset_1st_component(path);
@@ -2765,27 +2789,47 @@ int is_path_owned_by_current_sid(const char *path, struct strbuf *report)
 			strbuf_addf(report, "'%s' is on a file system that does "
 				    "not record ownership\n", path);
 		} else if (report) {
-			LPSTR str1, str2, to_free1 = NULL, to_free2 = NULL;
+			LPSTR str1, str2, str3, str4, to_free1 = NULL,
+			    to_free3 = NULL, to_local_free2 = NULL,
+			    to_local_free4 = NULL;
 
-			if (ConvertSidToStringSidA(sid, &str1))
+			if (user_sid_to_user_name(sid, &str1))
 				to_free1 = str1;
 			else
 				str1 = "(inconvertible)";
-
-			if (!current_user_sid)
-				str2 = "(none)";
-			else if (!IsValidSid(current_user_sid))
-				str2 = "(invalid)";
-			else if (ConvertSidToStringSidA(current_user_sid, &str2))
-				to_free2 = str2;
+			if (ConvertSidToStringSidA(sid, &str2))
+				to_local_free2 = str2;
 			else
 				str2 = "(inconvertible)";
+
+			if (!current_user_sid) {
+				str3 = "(none)";
+				str4 = "(none)";
+			}
+			else if (!IsValidSid(current_user_sid)) {
+				str3 = "(invalid)";
+				str4 = "(invalid)";
+			} else {
+				if (user_sid_to_user_name(current_user_sid,
+							  &str3))
+					to_free3 = str3;
+				else
+					str3 = "(inconvertible)";
+				if (ConvertSidToStringSidA(current_user_sid,
+							   &str4))
+					to_local_free4 = str4;
+				else
+					str4 = "(inconvertible)";
+			}
 			strbuf_addf(report,
 				    "'%s' is owned by:\n"
-				    "\t'%s'\nbut the current user is:\n"
-				    "\t'%s'\n", path, str1, str2);
-			LocalFree(to_free1);
-			LocalFree(to_free2);
+				    "\t%s (%s)\nbut the current user is:\n"
+				    "\t%s (%s)\n",
+				    path, str1, str2, str3, str4);
+			free(to_free1);
+			LocalFree(to_local_free2);
+			free(to_free3);
+			LocalFree(to_local_free4);
 		}
 	}