From 6c92f80f2ecb106916534d4b88704432476b9006 Mon Sep 17 00:00:00 2001
From: Alex Turbov <i.zaufi@gmail.com>
Date: Thu, 29 Jul 2021 21:32:26 +0300
Subject: cmake_host_system_information: Also set `USED_FALLBACK_SCRIPT`

If the OS identification was obtained via fallback script.
---
 Source/cmCMakeHostSystemInformationCommand.cxx                       | 5 ++++-
 Tests/RunCMake/cmake_host_system_information/CentOS6-stdout.txt      | 1 +
 Tests/RunCMake/cmake_host_system_information/Debian6-stdout.txt      | 1 +
 .../cmake_host_system_information/UserFallbackScript-stdout.txt      | 1 +
 4 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/Source/cmCMakeHostSystemInformationCommand.cxx b/Source/cmCMakeHostSystemInformationCommand.cxx
index 90240a1..1464220 100644
--- a/Source/cmCMakeHostSystemInformationCommand.cxx
+++ b/Source/cmCMakeHostSystemInformationCommand.cxx
@@ -287,6 +287,8 @@ std::map<std::string, std::string> GetOSReleaseVariables(
 
   // Ugh, it could be some pre-os-release distro.
   // Lets try some fallback getters.
+  // See also:
+  //  - http://linuxmafia.com/faq/Admin/release-files.html
 
   // 1. CMake provided
   cmsys::Glob gl;
@@ -358,8 +360,9 @@ std::map<std::string, std::string> GetOSReleaseVariables(
       data.emplace(std::move(key), std::move(value));
     }
 
+    // Try 'till some script can get anything
     if (!data.empty()) {
-      // Try 'till some script can get anything
+      data.emplace("USED_FALLBACK_SCRIPT", script);
       break;
     }
   }
diff --git a/Tests/RunCMake/cmake_host_system_information/CentOS6-stdout.txt b/Tests/RunCMake/cmake_host_system_information/CentOS6-stdout.txt
index 803ee08..50dbb08 100644
--- a/Tests/RunCMake/cmake_host_system_information/CentOS6-stdout.txt
+++ b/Tests/RunCMake/cmake_host_system_information/CentOS6-stdout.txt
@@ -2,5 +2,6 @@
 -- CENTOS6_ID_LIKE=`rhel`
 -- CENTOS6_NAME=`CentOS`
 -- CENTOS6_PRETTY_NAME=`CentOS release 6\.10 \(Final\)`
+-- CENTOS6_USED_FALLBACK_SCRIPT=`.*/Modules/Internal/OSRelease/010-TryOldCentOS.cmake`
 -- CENTOS6_VERSION=`6\.10`
 -- CENTOS6_VERSION_ID=`6\.10`
diff --git a/Tests/RunCMake/cmake_host_system_information/Debian6-stdout.txt b/Tests/RunCMake/cmake_host_system_information/Debian6-stdout.txt
index 60d6425..4193d6f 100644
--- a/Tests/RunCMake/cmake_host_system_information/Debian6-stdout.txt
+++ b/Tests/RunCMake/cmake_host_system_information/Debian6-stdout.txt
@@ -1,4 +1,5 @@
 -- DEBIAN6_ID=`debian`
 -- DEBIAN6_NAME=`Debian`
+-- DEBIAN6_USED_FALLBACK_SCRIPT=`.*/Modules/Internal/OSRelease/020-TryDebianVersion.cmake`
 -- DEBIAN6_VERSION=`6\.0\.10`
 -- DEBIAN6_VERSION_ID=`6\.0\.10`
diff --git a/Tests/RunCMake/cmake_host_system_information/UserFallbackScript-stdout.txt b/Tests/RunCMake/cmake_host_system_information/UserFallbackScript-stdout.txt
index afcc000..acaf47e 100644
--- a/Tests/RunCMake/cmake_host_system_information/UserFallbackScript-stdout.txt
+++ b/Tests/RunCMake/cmake_host_system_information/UserFallbackScript-stdout.txt
@@ -2,5 +2,6 @@
 -- UFS_ID_LIKE=`nothing`
 -- UFS_NAME=`UnitTest`
 -- UFS_PRETTY_NAME=`Just a Unit Test`
+-- UFS_USED_FALLBACK_SCRIPT=`.*/999-LastFallbackScript\.cmake`
 -- UFS_VERSION=`0\.0\.1`
 -- UFS_VERSION_ID=`0\.0\.1`
-- 
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